Bendix Sd 13 4986 Users Manual

2015-04-02

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SD-13-4986

The Bendix® ESP® EC‑80™ Controller
Label Shows ECU
Designation

INTRODUCTION
®

™

The Bendix ESP EC‑80 Electronic Control Unit (ECU)
is a member of a family of three Bendix® -brand electronic
Antilock Braking System (ABS) devices used to help
improve the braking characteristics of air-braked heavyand medium-duty trucks, tractors, and buses:
1. The Bendix® ABS ESP® ECU uses wheel speed sensors
to monitor four wheel-ends to detect wheel-slip or wheel
lock‑up during braking. The system intervenes when
needed — using Pressure Modulator Valves (PMVs)
to adjust and/or pulse the brake pressure — in order
to optimize the contact between the tires and the road
surface.
2. The Bendix® Automatic Traction Control (ATC) EC‑80™
ECU provides standard ABS; improves vehicle traction
during acceleration; and aid lateral stability while driving
through curves. The Bendix® ATC ECU communicates
with the engine’s Controller to provide Engine Torque
Limiting (ETL), and/or use Differential Braking (DB) to
make brake applications at individual wheels.
3. The Bendix ESP EC‑80 Controller provides — in
addition to the ABS and ATC functions described
above — advanced braking features referred to as the
Bendix® ESP® Electronic Stability Program. The Bendix
ESP EC‑80 Controller analyzes the vehicle's motion
compared to the driver's intended path and provides
Yaw Control (YC) and Roll Stability Program (RSP)
capabilities. When necessary, the system will intervene
to reduce the engine throttle, and/or apply the brakes
at one or more of the wheel ends — to help the vehicle
return to the intended direction.
Previous
Bendix®
(Bendix®
EC‑80™
EC-60™ ECU)
System Name Designations

FIGURE 1 - THE BENDIX® ESP® EC‑80™ CONTROLLER

The driver is always responsible for the control
and safe operation of the vehicle at all times. The
Bendix ® ABS system does not replace the need
for a skilled, alert professional driver, reacting
appropriately and in a timely manner, and using
safe driving practices.

TABLE OF CONTENTS
Page
Components . . . . . . . . . . . . . . . . . . . . 3-4
Indicator Lamps and Power-Up Sequence . . . . . 8-9
ABS Operation . . . . . . . . . . . . . . . . . . . 9-10
ATC Operation . . . . . . . . . . . . . . . . . . . 11-12
ESP ABS With Stability Control . . . . . . . . . . 12-13
Important Safety Information About
The ESP Stability System . . . . . . . . . . . . . 13-14
Troubleshooting . . . . . . . . . . . . . . . . . . . 17-62
See page 63 for the full Table of Contents

Key System Features
Key Components

ABS

“Standard”

ECU; Pressure Modulator Valves (PMVs);
Four Wheel Speed Sensors.

ATC

“Premium”

Items above, plus: Automatic Traction
Control (ATC) Valve; Option of two more
Wheel Speed Sensors and PMVs.

ESP®

All items above, plus: Yaw Rate Sensor;
Steering Angle Sensor; Load Sensor;
“Advanced”
Steer-axle ATC valve; Brake Demand
Sensor; and an Additional PMV
®

(ECU Designation Shown
on the ECU Label)

ABS [Antilock Braking]
(EC-80 ABS)

ABS plus ATC [Traction Control]
(EC-80 ATC)

ABS plus ATC plus ESP
[Yaw Control (YC) and
Roll Stability Program (RSP®)].
(EC-80 ESP)

ESP is a registered trademark of DaimlerChrysler and is used by BCVS under license.

ECU
See
Connector
Service Data
Locations
Sheet
Provided
Two

SD-13-4983

Three

SD-13-4983

Four

SD-13-4986
(This
Document)
1

GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS
TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:
▲ Park the vehicle on a level surface, apply the
parking brakes and always block the wheels.
Always wear personal protection equipment.
▲ Stop the engine and remove the ignition key
when working under or around the vehicle.
When working in the engine compartment,
the engine should be shut off and the ignition
key should be removed. Where circumstances
require that the engine be in operation, EXTREME
CAUTION should be used to prevent personal
injury resulting from contact with moving,
rotating, leaking, heated or electrically-charged
components.
▲ Do not attempt to install, remove, disassemble
or assemble a component until you have read,
and thoroughly understand, the recommended
procedures. Use only the proper tools and
observe all precautions pertaining to use of those
tools.
▲ If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with a
Bendix® AD-IS® air dryer system, a Bendix® DRM™
dryer reservoir module, or a Bendix® AD-9si™ air
dryer, be sure to drain the purge reservoir.
▲ F o l l o w i n g t h e v e h i c l e m a n u f a c t u r e r ’s
recommended procedures, deactivate the
electrical system in a manner that safely removes
all electrical power from the vehicle.

▲ Never exceed manufacturer’s recommended
pressures.
▲ Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove
a component or plug unless you are certain all
system pressure has been depleted.
▲ Use only genuine Bendix ® brand replacement
parts, components and kits. Replacement
hardware, tubing, hose, fittings, etc. must be of
equivalent size, type and strength as original
equipment and be designed specifically for such
applications and systems.
▲ Components with stripped threads or damaged
parts should be replaced rather than repaired.
Do not attempt repairs requiring machining or
welding unless specifically stated and approved
by the vehicle and component manufacturer.
▲ Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
▲ For vehicles with Automatic Traction Control
(ATC), the ATC function must be disabled (ATC
indicator lamp should be ON) prior to performing
any vehicle maintenance where one or more
wheels on a drive axle are lifted off the ground
and moving.
▲ The power MUST be temporarily disconnected
from the radar sensor whenever any tests USING
A DYNAMOMETER are conducted on a Bendix®
Wingman® Advanced™-equipped vehicle.

▲ You should consult the vehicle manufacturer's operating and service manuals, and any related literature,
in conjunction with the Guidelines above.

Even with the Bendix® ESP® system with the EC‑80™
Controller, the driver remains responsible for ensuring
vehicle stability during operation. The braking system
can only function within the limits of physics. The
system helps mitigate potential vehicle stability
incidents, but cannot prevent them in all cases.
Other factors such as driving too fast for road, traffic
or weather conditions, oversteering, an excessively
high vehicle Center of Gravity (CG), or poor road
conditions can cause vehicle instability that is beyond
the capability of any stability system to mitigate. In
addition, the effectiveness of Bendix ESP system
with the EC‑80 Controller can be greatly reduced on
vehicles towing multiple trailer combinations.

The Bendix ESP system with the EC‑80 Controller
(see page 12) may only be used on vehicles tested and
approved by Bendix engineering. The tests produce
a validated parameter data set for use by the vehicle’s
Bendix ESP EC‑80 Electronic Control Unit (ECU).
When replacing an ECU, only specific Controllers —
with the correct parameter set — may be used. See
“Obtaining a New Bendix ESP EC‑80 Controller” on
page 17 for further details.
Bendix ESP system with the EC‑80 Controller-equipped
vehicles should not be driven on high-banked roads —
such as those found on high-speed test or race tracks.
Test personnel must have the Bendix ESP system's
stability features disabled prior to operating a vehicle
on such tracks.

For vehicles with the (optional) Hill Start Aid (HSA) system
(sometimes referred to as a “Hill Start Assist”, or simply “Hill
Start”), this feature interfaces between the transmission
and the braking system. HSA helps the driver prevent
the vehicle from rolling downhill when moving up a steep
incline from a stationary position. See page 6 for more
information.

The Bendix ESP EC‑80 Controller's ESP/RSP function
utilizes the following additional components:
•

A Steer Axle Traction Control Valve (may be integral
to the service brake Relay Valve or a stand-alone
device)
Sensor
Clamping
Sleeve

YAW CONTROL (YC)
A Bendix® EC‑80™ ESP® Controller includes Yaw Control
(YC) functionality. Yaw Control has the ability to apply
brakes to individual wheel ends, as well as applying the
trailer brakes, to counteract trailer “push” that — during
certain maneuvers — could lead to a loss-of-control or
a jackknife incident. See "Yaw Stability" on page 13 for
further details.

Straight Speed
Sensors
90° Speed
Sensors

FIGURE 2 - BENDIX® WS-24™ WHEEL SPEED SENSORS

ROLL STABILITY PROGRAM (RSP)
The Bendix® Roll Stability Program (RSP), is an all-axle
ABS solution that helps decrease vehicle speed by
reducing the engine's throttle and applying all vehicle
brakes as needed, mitigating the vehicle's tendency to
roll over. RSP focuses on reducing the vehicle’s speed
below the critical roll threshold during direction-changing
maneuvers — such as driving on curved highway exit
ramps or obstacle avoidance maneuvers on dry, high
friction surfaces. See "ESP ABS with Stability Control"
on page 12 for further details.

Delivery
(Port 2)
Supply
(Port 1)

M-40X™
Modulator

Electrical
Connector
Exhaust (Port 3)

FIGURE 3 - EXAMPLE OF A BENDIX M-40X™ MODULATOR

During an RSP system intervention, the vehicle
automatically decelerates. RSP can slow the
vehicle with or without the operator applying
the brake pedal, and even when the operator is
applying the throttle.

COMPONENTS
The Bendix ESP EC‑80 Controller’s ABS function utilizes
the following components:
• Bendix® WS-24™ Wheel Speed Sensors (four or
six, depending on the configuration), each with a
clamping sleeve. [Refer to SD-13-4860]

• A dash-mounted ESP Status/Indicator Lamp (also
serves as the ATC Status/Indicator Lamp)
• A Bendix ® SAS-60 ™ Steering Angle Sensor
(mounted to the steering column - See Figure 4)

When replacing a steering wheel, take care not to
damage the Steering Angle Sensor or interfere with
its operation, and the Steering Angle Sensor must be
recalibrated (see Troubleshooting section.)

• Bendix® M-40QR™ or M-40-HF™ Pressure Modulator
Valves (four, five, or six may be present) [refer to
SD-13-4958]. For legacy systems where a Bendix®
M-32™ or M-32QR™ Pressure Modulator Valve is
used, refer to SD-13-4870.
• A dash-mounted tractor ABS Indicator Lamp
• A service brake Relay Valve

Straight
Connector

90° Connectors

• A dash-mounted trailer ABS Indicator Lamp
• An optional blink code Activation Switch

FIGURE 4 - EXAMPLES OF STEERING ANGLE SENSORS

• An optional ABS Off-road Switch
3

• Bendix® YAS-60™ or YAS-70X™ Yaw Rate/Lateral
Acceleration Sensors (typically mounted to a crossmember near the back of the vehicle cab). See
Figure 5.
• Brake Demand Sensors (installed in the primary
and secondary delivery circuits)
•

A Load Sensor (typically installed in the suspension
air bag)

•

An additional Modulator Valve (Bendix® M-40QR™ or
M-40HF™ Pressure Modulator Valve) that controls
the pressure applied to the trailer brakes during a
system intervention

The Bendix ® ESP ® EC‑80™ Controller's ATC function
utilizes the following additional components:
•

A drive axle Traction Control Valve (may be integral
to the service brake relay valve or a stand-alone
device)

• A dash-mounted ATC Status/Indicator Lamp
• A J1939 serial communication Control Module
• A J1939- or ECU hardware-provided Stop Lamp
Switch Input
• An optional ATC Mud/Snow Switch (sometimes
referred to as an ATC off-road switch)
Brake Demand/
Load Sensor

Bendix® RV-3™
Pressure
Reducing Valve

Bendix® AT-3™
Traction Control
Valve

Bendix® DC-4®
Double Check
Valve

FIGURE 6 - ADDITIONAL VALVES NECESSARY FOR THE
HILL START AID FEATURE

BENDIX® ETRAC™ AUTOMATED AIR
SUSPENSION TRANSFER SYSTEM
The Bendix® eTrac™ automated air pressure transfer system
is used on 6 x 2 semi-tractors that feature Bendix® ATC
and ESP Antilock Brake Systems (ABS). This system
complements the Bendix® SMART ATC™ traction control
feature of our ABS system to provide improved traction at
low speeds (e.g. pulling away on an inclined ramp, or in
slippery conditions such as mud or snow-covered surfaces,
etc.) When active, the Bendix eTrac system vents — or
“dumps” — the air pressure of the tag axle suspension
air bags, and increases the air pressure in the drive axle
suspension air bags to a pre-determined maximum. This
action helps the drive axle to gain more traction.
See SD-13-21021 for more information about the Bendix ®
eTrac™ Automated Air Suspension Transfer System.

ECU MOUNTING
The Bendix ESP EC‑80 Controller is not protected against
moisture, and must be mounted in an environmentally
protected area.
Yaw/Lateral
Accelerator Sensors
(Two examples
shown.)

All wire harness connectors must be properly seated. The
use of secondary locks is strongly recommended.
The Bendix ESP EC‑80 Controller utilizes connectors from
the AMP MCP 2.8 product family.

HARDWARE CONFIGURATIONS
FIGURE 5 - YAW AND BRAKE DEMAND/LOAD SENSORS

The Bendix ESP EC‑80 Controller's Hill Start Aid function
utilizes the following additional components:
• A Bendix® AT-3™ Traction Control Valve
• A dash-mounted Hill Start Status/Indicator Lamp
• A dash-mounted Enable/Disable Switch
• A Bendix® RV-3™ Pressure Reducing Valve
• A Bendix® DC-4® Double Check Valve

Bendix ESP EC‑80 Controllers support applications up to
six sensor/six modulator (6S/6M) installations with ATC
and drag torque control. They can also support Hill Start
functions. All 12 volt models support Power Line Carrier
(PLC). 24 volt models do not support PLC. See Figure 7
for more details.

ABS
OffRoad

ATC

Bendix ®
HSA
ATC
Blink ESP/
eTrac™
Hill Start
Mud/Snow Codes RSP Aid Feature
system*

Optional

Optional Optional

ModuRetarder
Input
Sensors
PLC lators
Relay
Voltage
(PMVs)

12/24

4/5/6

Serial
Communication

J1939

4/6

* For information about the Bendix ® eTrac™ automated air suspension transfer system, see SD-13-21021
FIGURE 7 - BENDIX® ESP® EC‑80™ CONTROLLER FEATURES

BENDIX® ESP® EC‑80™ CONTROLLERS USE
POWER LINE CARRIER (PLC)
All new towing vehicles built since March 1, 2001, have had
an in-cab trailer ABS Indicator Lamp installed.
Trailers built since March 1, 2001, transmit the status of
the trailer ABS over the power line (the blue wire of the
J560 connector) to the tractor using a Power Line Carrier
(PLC) signal. See Figures 8 and 9. Typically the signal is
broadcast by the trailer ABS Electronic Control Unit (ECU).

Suggested oscilloscope settings are AC coupling, with one
volt/div, 100 µsec/div. The signal should be measured at
the ignition power input of the Bendix EC‑80 Controller.
Note: An ABS trailer equipped with PLC, or a PLC
diagnostic tool, must be connected to the vehicle in order
to generate a PLC signal on the power line.

BENDIX ESP EC‑80 CONTROLLER INPUTS
Battery and Ignition Inputs
The Bendix ESP EC‑80 Controller operates at a nominal
supply voltage of 12 or 24 volts, depending on the ECU.
The battery input is connected through a 30 amp fuse
directly to the battery.
The ignition input is applied by the ignition switch circuit
through a 5 amp fuse.

Ground Input
FIGURE 8 - POWER LINE WITHOUT PLC SIGNAL

The Bendix ESP EC‑80 Controller supports one ground
input. See pages 52 and 53 for wiring system schematics.

ABS Indicator Lamp Ground Input
The Bendix ESP EC‑80 Controller requires a second
ground input (X1‑12) for the ABS indicator lamp. The X1
wire harness connector contains an ABS indicator lamp
interlock (X1‑15), which shorts the ABS indicator lamp
circuit (X1‑18) to ground if the connector is removed from
the ECU.

Bendix® WS-24™ Wheel Speed Sensors
FIGURE 9 - POWER LINE WITH PLC SIGNAL

The application of PLC technology for the heavy vehicle
industry in North America is known as “PLC4Trucks.”
The Bendix ® ESP ® EC‑80™ Controller supports PLC
communications in accordance with SAE J2497.
PLC SIGNAL
An oscilloscope can be used to measure or identify the
presence of a PLC signal on the power line. The PLC
signal is an amplitude and frequency-modulated signal.
Depending on the filtering and load on the power line,
the PLC signal amplitude can range from 5.0 mVp-p to
7.05 Vp-p.

Wheel speed data is provided to the Bendix ESP EC‑80
Controller from the Bendix® WS-24™ wheel speed sensor
(see Figure 2). Vehicles have an exciter ring (or “tone
ring”) as part of the wheel assembly. As the wheel
turns, the teeth of the exciter ring pass the wheel speed
sensor, generating an AC signal. The Bendix ESP EC‑80
Controller receives the AC signal, which varies in voltage
and frequency as the wheel speed changes.
Vehicle axle configurations determine the number of
Bendix WS‑24 wheel speed sensors that must be used.
A vehicle with a single rear axle requires four wheel speed
sensors. Vehicles with two rear axles can utilize six wheel
speed sensors for optimal performance.

Diagnostic Blink Code Switch

Stop Lamp Switch (SLS)

A momentary switch that grounds the ABS Indicator Lamp
output is used to place the ECU into the diagnostic blink code
mode and is typically located on the vehicle’s dash panel.

The Bendix ESP EC‑80 Controller monitors the vehicle
stop lamp status. Certain vehicle functions, such as
ATC and All-Wheel Drive (AWD), use the status of the
stop lamp to determine when the driver makes a brake
application. This can be provided to the ECU via J1939
communications, or hardware input.

Optional ABS Off-Road Switch and Indicator
Lamp Operation
Vehicle operators use an optional dash-mounted switch to
place the Bendix® ESP® EC‑80™ Controller into the ABS
off-road mode. See "Optional ABS Off-Road Mode" on
page 10 for further details. In some cases, ECUs may
also be put into the ABS off-road mode by one of the other
vehicle control modules, using a J1939 message to the
Bendix ESP EC‑80 Controller.
(If you need to know if a specific Bendix ESP EC‑80
Controller uses a J1939 message to operate the lamp,
contact the Bendix Tech Team. E-mail the Tech Team
at ABS@bendix.com (be sure to specify the ECU part
number), or call 1‑800‑AIR‑BRAKE (1-800-245-2725).

The ABS off-road mode should not be used on
normal, paved road surfaces because vehicle
stability and steerability may be adversely affected.
When the ECU is placed in the ABS off-road mode,
the ABS Indicator Lamp will flash constantly (at a
rate of once per 2.5 seconds) to notify the vehicle
operator that the off-road mode is active.

Optional ATC Mud/Snow (Off-Road) Switch and
Indicator Lamp Operation (also see page 8.)
The Bendix ESP system uses a dash-mounted switch for the
operator to place the ECU into the ATC Mud/Snow mode.

Optional Hill Start/Hill Start Assist Feature
Switch and Lamp Operation (see also page 8.)
ESP Controllers use a dash-mounted switch for the
operator to place the ECU into the hill start mode. This
feature interfaces between the transmission and the
braking system to help the driver prevent the vehicle from
rolling downhill when moving up a steep incline from a
stationary position.

With Hill Start Aid Feature option you lose the ABS
off-road function and the retarder relay output.
When the ECU is placed in the Hill Start Aid (HSA) feature
mode, the HSA Indicator Lamp will flash constantly (at a
rate of once per 2.5 seconds) to notify the vehicle operator
that the HSA mode is active. The ECU receives J1939
messages from the transmission to engage the HS/HSA
components. When engaged, the system applies 44 psi to
the rear brakes for three (3) seconds then releases. This
function is totally controlled by the automatic transmission.
6

Brake Demand Sensors
The brake demand sensors provide the Controller with an
indication of driver-applied brake pressure. One is installed
in the primary air brake circuit, and another is installed in
the secondary air brake circuit.

Load Sensor
The load sensor provides the Controller with an indication
of the vehicle load. It is typically installed in one of the
suspension air bags.

Bendix® SAS-70X™ Steering Angle Sensor
Bendix® brand Steering Angle Sensors (SAS) are used to
report the steering wheel position to the Controller, utilizing
a dedicated serial communications link that is shared with
the Yaw Rate Sensor. The Controller supplies the power
and ground inputs to the Bendix® SAS‑70X™ sensor.
The Bendix SAS-70X sensor is available with two different
styles of wire harness connectors. (See Figure 4.)

Bendix® YAS-60™ or YAS-70X™ Yaw Rate/Lateral
Acceleration Sensors
Bendix® brand yaw rate/lateral acceleration sensors are
used to provide the Controller an indication of vehicle
lateral acceleration and rotation around the vertical axis.
This information is provided to the Controller, utilizing a
dedicated serial communications link that is shared with
the Bendix® SAS-60™ sensor. The Controller supplies the
power and ground inputs to the yaw rate sensor.

BENDIX® ESP® EC‑80™ CONTROLLER
OUTPUTS
Bendix® M-40QR™ and M-40HF™ Pressure
Modulator Valves (PMVs)
The Bendix ESP EC‑80 Controller operates Bendix ®
M-40QR™ and M-40HF™ Pressure Modulator Valves
(PMVs) to modify the driver-applied air pressure to the
service brakes during ABS, ATC, RSP or YC activation
(see pages 9-13). The PMV is an electropneumatic
control valve and is the last valve that air passes through
on its way to the brake chamber. The modulator hold and
release solenoids are activated to "modulate" or "control"
the brake pressure during an antilock braking event. The
hold solenoid is normally open and the release solenoid is
normally closed, such that the PMV nominally allows air to
flow through. This design allows for air delivery to brake
chambers in the event of electrical trouble.

The Bendix ® ESP ® EC‑80™ Controller also utilizes an
additional Pressure Modulator Valve (PMV) for control
of the trailer service brakes during stability interventions.

Traction Control Valve (TCV)
Bendix ESP EC‑80 Controllers use two TCVs, one on the
steer axle and one on the drive axle. The TCV may be a
separate valve or integrated into the rear axle relay valve.
The Controller will activate the drive axle TCV during
differential braking ATC events.
During stability interventions, the Controller will activate
both the steer axle and drive axle TCVs as required.

Stop Lamp Output
The Controller provides an output to control a relay
that illuminates the vehicle stop lamps during stability
interventions. This information is also available using the
J1939 serial communications link.

ABS Indicator Lamp Control with Optional
Diagnostic Blink Code Switch
The Bendix ESP EC‑80 Controller has internal circuitry to
control the ABS Indicator Lamp on the dash panel.
The ABS Lamp Illuminates:
1. During power up (e.g. when the vehicle is started) for
approximately three (3) seconds and turns off after the
self‑test is completed, providing no Diagnostic Trouble
Codes (DTCs) are present on the ECU;
2. When full ABS operation is not available due to the
presence of a DTC on the ECU;
3. If the ECU is unplugged or has no power;
4. When the ECU is placed into the ABS off-road
mode (the lamp flashes steadily at a rate of once per
2.5 sec.); or
5. To display blink codes for diagnostic purposes after the
external diagnostic switch is activated.
The Bendix ESP EC‑80 Controller may communicate
with other vehicle control modules to operate the ABS
Indicator Lamp using serial communications. (If you
need to know if this Bendix ESP EC‑80 Controller uses
serial communications to operate the lamp; e-mail ABS@
bendix.com, (be sure to specify the ECU part number), or
call 1‑800‑AIR‑BRAKE/1-800-247-2725 and speak to the
Bendix Tech Team.)

Indicator Lamp Control Using Serial
Communications Links
As mentioned above, depending on the vehicle
manufacturer, the dash indicator lamps (ABS, ATC,
ESP, and trailer ABS) may be controlled using serial
communications links. In these cases, the Bendix ESP
EC‑80 Controller will send a serial communications
message over the J1939 link, indicating the required status
of the lamp(s). Another vehicle control module receives
the message and controls the indicator lamp(s).

Dynamometer Mode Indicator Lamp Operation
When the Bendix ESP EC‑80 Controller is put into the
Dynamometer mode for testing purposes, the ATC
Indicator Lamp will be illuminated.

Retarder Relay Disable Output
The retarder relay disable output may be used to control a
retarder disable relay. When configured to use this output,
the ECU will energize the retarder disable relay and inhibit
the use of the retarder as needed.
If the ECU is configured for the Hill Start/ Hill Start Assist
feature (HS/HSA), the retarder relay output pin is used to
control the Hill Start status lamp. As a result, the vehicle
loses the retarder relay function when it has the Hill Start
feature.

SAE J1939 Serial Communications
A Controller Area Network (CAN) data link (SAE J1939) is
provided for communication. This link is used for various
functions, such as:
• Diagnostic purposes.
• To disable retarding devices during ABS operation.
• To request that the torque converter disable lock-up
during ABS operation
• To share information such as wheel speed and ECU
status with other vehicle control modules.
Bendix ESP EC‑80 Controllers utilize the J1939 data link
for:
• ATC and drag torque control functions.
• Vehicle stability functions.

Trailer ABS Indicator Lamp Control
The Bendix ESP EC‑80 Controller will activate a trailer ABS
Indicator Lamp (located on the dash panel) that indicates
the status of the trailer ABS unit on one, or more trailers, or
dollies that are equipped with PLC functionality. Typically,
the Bendix ESP EC‑80 Controller directly controls the
trailer ABS Indicator Lamp based on the information it
receives from the trailer ABS, via PLC.
Alternatively, some vehicles require the Bendix ESP EC‑80
Controller to activate the trailer ABS Indicator Lamp by
communicating with other vehicle Controllers using serial
communications.
(If you need to know if this Bendix ESP EC‑80 Controller
uses a serial communications message to operate the
lamp, e-mail ABS@bendix.com (be sure to specify the ECU
part number), or call 1-800-AIR-BRAKE (1-800-245-2725)
and speak to the Bendix Tech Team.)

Interaxle Differential Lock Control
(AWD Transfer Case)
Bendix ESP EC‑80 Controllers can control the interaxle
differential lock (AWD transfer case). This is recommended
on AWD vehicles, but the ECU must be specially configured
to provide this feature. E-mail ABS@bendix.com for more
details.
7

INDICATOR LAMPS AND POWER-UP
SEQUENCE
NOTICE: The vehicle operator should Verify the proper
operation of all installed indicator lamps (ABS, ATC/ESP,
and trailer ABS) when applying ignition power and during
vehicle operation. See Figure 10.
Dash Lamp Behavior for the
Bendix® ESP® EC‑80™ Controller

ABS

TRLR

HSA

ATC

ABS
Lamp

Mode

Lamps that do not illuminate as expected when ignition
power is applied, or remain illuminated, indicate the need
for maintenance.

ATC/ESP Lamp

Trailer
ABS Lamp

HSA
Lamp

Comments

At Vehicle Startup

*
Ignition on - start up
[trailer with Power Line
Carrier (PLC)]

ON for
three (3)
seconds*

ON for 2.5
seconds*

ON for
three (3)
seconds*

** Some vehicle manufacturers may
3 seconds after ignition
[with no Diagnostic
Trouble Codes (DTCs)]

Lamp OFF*

Normal

Special Mode Operation

ON for
three (3)
seconds**

If any of the described lamp behaviors
do not occur — or if the lamp remains
on during operation — have the vehicle
serviced by a qualified mechanic as
soon as possible to restore full system
functionality.

ABS
Lamp flashes
Off-Road
slowly (every 2.5
During an ATC
Mode
seconds)
Event

Lamp OFF

Flashes quickly

Lamp OFF**

illuminate the trailer ABS indicator lamp
at power‑up regardless of whether a
PLC signal is detected from the trailer or
not. Consult the vehicle manufacturer’s
documentation for more details.

Lamp
OFF*

• Uses dash switch
• Not for firm road surfaces
• Allows more wheel lock-up (less ABS intervention)
• Mode only applies under 25 mph (Over 25 mph, the system reverts to
full ABS - including ATC/ESP — and upon exiting off-road mode, the
ATC lamp extinguishes.)

-— OR, depending on vehicle options (a vehicle can have either ABS off-road or HSA) —
Vehicles with Hill Start Aid (HSA):
During HSA Mode
(“Hill Start” / “Hill Start Assist”)

Deep
Mud/
Snow/
Mode

During HSA Event

Lamp OFF

HSA Manually Disabled

Flashes
slowly

Normal

OFF

Flashes slowly
(every 2.5
seconds)

During an
ATC/ESP
Event

OFF

Flashes quickly

During an Automatic Traction Control (ATC) Event

Flashes quickly

During Dynamometer Mode

Lamp ON
(ATC
Disabled)

During an ESP Event

Flashes quickly

ABS System
Status Indicators
at Start-Up

Power
Application
0.5 1.5 2.0 2.5 3.0 (sec.)

• The HSA lamp is illuminated only at powerup, or if an HSA DTC is present

• Uses dash switch
• Increases allowable wheel slip during ATC interventions
• Not for firm road surfaces

• Reduces wheel slip during acceleration at low speeds
• Disables ATC monitoring functions
• When not in Dynamometer Mode, an illuminated lamp indicates an
ATC DTC is present
• System intervenes to reduce the risk of rollovers, loss-of-control, etc.

ATC/ESP System
Status Indicator
at Start-Up

Powered Vehicle ABS
Indicator Lamp OFF
Trailer ABS ON
Indicator Lamp
(PLC Detected)** OFF
Trailer ABS ON
Indicator Lamp**
(PLC Not Detected) OFF

Power
Application

0.5 1.5 2.0 2.5 3.0 (sec.)

ATC/ESP
enabled

ON
OFF
ON

No ESP
or ATC

FIGURE 10 - BENDIX® ESP® EC‑80™ CONTROLLER INDICATOR LAMP BEHAVIOR
8

OFF

ABS Indicator Lamp Operation (Bulb Check)
The Bendix® ESP® EC‑80™ Controller will illuminate the
ABS Indicator Lamp for approximately three seconds when
ignition power is applied, after which the lamp will extinguish
if no Diagnostic Trouble Codes (DTCs) are detected.
The Controller will illuminate the ABS Indicator Lamp
whenever full ABS operation is not available due to a DTC.
In most cases, partial ABS is still available.

ATC/ESP Status/Indicator Lamp Operation
The Bendix ESP EC‑80 Controller will illuminate the ATC/
ESP lamp for approximately 2.5 seconds when ignition
power is applied, after which the lamp will extinguish if
no DTCs are detected. The Controller will continuously
illuminate the ATC/ESP Indicator Lamp whenever ESP or
ATC is disabled due to a DTC.
During an ESP or ATC intervention, the lamp will flash
rapidly (2.5 times per second). When the Controller is
placed in the ATC Mud/Snow (off-road) mode, the lamp
will flash slowly at a rate of once every 2.5 seconds.

Trailer ABS Indicator Lamp Operation
The Controller will control the Trailer ABS Indicator Lamp
when a PLC signal (SAE J2497) from a trailer ABS ECU
is detected.

Hill Start Assist (HSA) Indicator Lamp Operation
Vehicles with HSA enabled, will illuminate the HSA
Indicator Lamp when ignition power is applied. The lamp
will extinguish if there are no issues with the HSA system.

Pressure Modulator Valve (PMV) and Traction
Control Valve (TCV) Chuff Test
Right Steer

Right Drive

Right
Additional

Left Drive

Left
Additional

Driver

Left Steer

FIGURE 11 - VEHICLE ORIENTATION (TYPICAL)

After the performance of the configuration test, the Bendix
ESP EC‑80 Controller will perform a Bendix-patented PMV
and TCV Chuff Test. The Chuff Test is an electrical and
pneumatic PMV test that can assist maintenance personnel
in verifying proper PMV wiring and installation.
When ignition power is applied, each modulator solenoid
is briefly energized. If the air system is fully charged and
the service brake pedal is depressed during ignition, the
modulator creates a single, sharp audible “chuff” of air
pressure. The modulators are energized in a certain
pattern: right front; left front; right rear; then left rear.

This test is performed only when the vehicle is stationary
(if the vehicle moves, the Chuff Test will not be performed).
The Bendix ESP EC‑80 Controller will perform a PMV
Chuff Test on all installed modulators in the following order:
• Steer Axle Right PMV;
• Steer Axle Left PMV;
• Drive Axle Right PMV;
• Drive Axle Left PMV;
• Additional Axle Right PMV;
• Additional Axle Left PMV; then
•

Drive Axle TCV

The pattern will then repeat itself. See Figure 11.
Vehicles with a Bendix ESP EC‑80 Controller — following
the completion of the second round of PMV & TCV Chuff
Tests — the Controller (if configured to do so) will perform
a test to cross-check the trailer PMV operation with the
vehicle stop lamps. If the trailer PMV circuit is mis-wired
(including the steer axle TCV), the PMV will exhaust a large
amount of air, or none at all.
NOTICE: If there are any active DTCs, the stop lamp
cross-check portion of the Chuff Test will not be carried out
until all DTCs are fully diagnosed and the corresponding
repairs are successfully conducted. The ESP/ATC dash
indicator will also illuminate when there are active ABS,
ATC or ESP DTCs.
The ECU will not perform the PMV Chuff Test when wheel
speed sensors show that the vehicle is in motion.

ABS OPERATION
Bendix® ABS uses wheel speed sensors, ABS pressure
modulator valves, and an ECU to control either four or six
wheels of a vehicle. The Bendix ESP EC‑80 Controller
monitors individual wheel turning motion during braking,
and adjusts or modulates the brake pressure at the wheel
end. When excessive wheel slip — or wheel lock-up — is
detected, the Bendix ESP EC‑80 Controller will activate
the pressure modulator valves to automatically reduce
the brake pressure at one or more of the wheel ends.
By these actions, the ABS system helps to maintain the
vehicle's lateral stability and steerability during heavy brake
applications and during braking on slippery surfaces.

Steer Axle Control
Although both wheels of the steer axle have their own
wheel speed sensor and pressure modulator valve, the
Bendix ESP EC‑80 Controller blends the applied braking
force between the two steering axle brakes. This Bendix
patented brake application control, called Modified
Individual Regulation (MIR), is designed to help reduce
steering wheel pull during an ABS event on road surfaces
with poor traction, or areas of poor traction (e.g. asphalt
road surfaces with patches of ice).

Single Drive Axle Control (4x2 Vehicle)
For vehicles with a single rear drive axle (4x2), the brakes
are operated independently by the Bendix® ESP® EC‑80™
Controller, based on the individual wheel behavior.

Dual Drive Axle Control (4S/4M Configuration)
For vehicles with dual drive axles (6x4) using a 4S/4M
configuration, one ABS modulator controls both of the
right-side rear wheels; the other modulator controls both
of the left-side rear wheels. Both wheels on each side
receive equal brake pressure during an ABS stop. The
rear wheel speed sensors must be installed on the axle
with the lightest load.

Dual Rear Axle Control (6S/6M Configuration)
For vehicles with dual rear axles (6x4, 6x2) using a 6S/6M
configuration, the rear wheels are controlled independently.
Therefore, brake application pressure at each wheel is
adjusted according to the individual wheel behavior on
the road surface.

corresponding stopping distance with conventional ABS
control, vehicle steerability and stability would be reduced.
Bendix ESP EC‑80 Controllers have an optional dash
switch that initiates a modified ABS control mode (known
as "off-road ABS") that more effectively accommodates
these soft road conditions to shorten stopping distance
while maintaining optimal vehicle steerability and stability.
Note: Off-road mode is not available if the vehicle is
equipped with Hill Start / Hill Start Assist (HS or HSA).

The ABS off-road mode should not be used on
normal, paved road surfaces because vehicle
stability and steerability may be reduced. The ABS
Indicator Lamp will flash slowly to indicate to the
driver that the ABS off-road mode is engaged.

6x2 Vehicles with 6S/5M Configuration
6x2 vehicles can utilize a 6S/5M configuration, with the
additional axle (a non-driven rear axle) having two sensors,
but only one Pressure Modulator Valve (PMV). In this case,
the PMV controls both wheels on the additional axle. The
additional axle wheels would receive equal brake pressure,
based on the wheel that is currently experiencing the most
wheel slip.

Normal Braking
During normal braking, brake pressure is delivered through
the ABS PMV and into the brake chamber. If the ECU
does not detect excessive wheel slip, it will not activate
ABS control, and normal vehicle service braking is applied.

Retarder Brake System Control
On surfaces with low traction, application of the retarder
can lead to high levels of wheel slip at the drive axle wheels,
which can adversely affect vehicle stability.
To prevent this, the Bendix ESP EC‑80 Controller switches
off the retarder as soon as a lock-up is detected at one (or
more) of the drive axle wheels.
When the ECU is placed in the ABS off-road mode (on
vehicles equipped with this optional feature), it will switch
off the retarder only when ABS is active on a steer axle
wheel and a drive axle wheel.

Optional ABS Off-Road Mode
On some road conditions, particularly when the driving
surface is soft, the stopping distance with conventional
ABS may be longer than without ABS. This can occur
when a locked wheel on soft ground or loose gravel plows
up the road surface in front of the tire, changing the rolling
friction value. Although vehicle stopping distance with a
locked wheel (in the absence of ABS) may be shorter than
10

When ABS off-road mode is engaged, stability
functions are disabled at speeds below approximately
25 mph/40 kph. The ATC/ESP dash lamp will illuminate
to indicate to the driver that the stability system is
disabled.
The vehicle manufacturer should provide the optional ABS
off-road function only for vehicles that operate on unpaved
surfaces — or that are used in off-road applications — and
is responsible for ensuring that vehicles equipped with the
ABS off-road function meet all FMVSS-121 requirements
and have adequate operator indicators and instructions.
The vehicle operator activates the off-road function with a
switch on the dash panel. A flashing ABS Indicator Lamp
indicates to the driver that the ABS off-road function is
engaged. To exit the ABS off-road mode, depress and
release the switch. A new ignition cycle will also cause
the ECU to exit the ABS off-road mode.

All-Wheel Drive (AWD) Vehicles
AWD vehicles with an engaged interaxle differential (steer
axle to rear axle) / AWD transfer case, may have negative
effects on ABS performance. Optimum ABS performance
is achieved when the lockable differentials are disengaged,
allowing individual wheel control.
Bendix ESP EC‑80 Controllers can be programmed
specifically for this configuration to control the differential
lock/unlock solenoid in the AWD transfer case. When
programmed to do so, the ECU will disengage the locked
interaxle/AWD transfer case during an ABS event and
reengage it once the ABS event has ended.

ATC OPERATION

Disabling ATC Differential Braking

ATC Functional Overview

ATC differential braking is disabled under the following
conditions:

Just as ABS improves vehicle stability during braking,
Automatic Traction Control (ATC) improves vehicle stability
and traction during vehicle acceleration. The Bendix ®
ESP® EC‑80™ Controller's ATC function uses the same
wheel speed information and modulator control as the
ABS function. The Bendix ESP EC‑80 Controller detects
excessive drive wheel speed; compares the speed to the
front, non-driven wheels; and reacts to help bring the wheel
spin under control. The Controller can be configured to use
engine torque limiting and/or differential braking to control
wheel spin. For optimal ATC performance, both methods
are recommended.

ATC/ESP Lamp Output/ATC Mud/Snow Switch
Input
Bendix ESP EC‑80 Controllers operate the ATC/ESP dash
lamp as follows.
The ATC/ESP dash lamp illuminates:
1. During power up (e.g. when the vehicle is started) for
approximately 2.5 seconds and turns off after the self
test is completed, providing no Diagnostic Trouble
Codes (DTCs) are present.
2. When ESP or ATC is disabled for any reason.
3. During an ESP or ATC event (the lamp will flash rapidly
at a rate of 2.5 times per second).
4. When the ECU is placed in the ATC off-road mode
(the lamp will flash steadily at a rate of once every 2.5
seconds). This notifies the vehicle operator that the
ATC Mud/Snow mode is active.
5. When the ECU is placed in the ABS off-road mode.
When in this mode, ESP will be disabled below 25 mph
and its inactive status will be indicated by a steadily
illuminated ATC/ESP lamp.

Differential Braking
Differential braking within ATC is automatically activated
when drive wheel(s) on one side of the vehicle are spinning
excessively. This typically occurs on road surfaces
with patches of ice. The traction system will then lightly
apply the brake to the drive wheel(s) that are spinning
excessively. The vehicle differential will then drive the
wheels on the other side of the vehicle.
Differential braking (as part of ATC functionality) is available
at vehicle speeds up to 25 mph/40 kph.

1. During power up (e.g. when the vehicle is started), until
the ECU detects a service brake application.
2. If the ECU receives a J1939 message indicating that
the vehicle is parked.
3. When the dynamometer test mode is active. The
Dynamometer test mode is entered using the diagnostic
Blink Code Switch or by using a diagnostic tool (such
as Bendix® ACom® Diagnostics).
4. In response to a serial communications request from
a diagnostic tool.
5. If ATC Differential Braking function is activated for a
long time period to avoid overheating of the brakes. It
would take approximately three (3) continuous minutes
of activation for the time‑out to occur. Once timed-out,
approximately two (2) minutes of "cool off" time would
be required before ATC Differential Braking can be used
again.
6. When certain DTC conditions are detected.

Traction Control with Engine Torque Limiting
The Bendix ESP EC‑80 Controller uses Engine Torque
Limiting to control drive-axle wheel slip. This is commu‑
nicated to the engine control module (using J1939), and
is available at all vehicle speeds.

Bendix® SMART ATC™ System
The Bendix ESP EC‑80 Controller has an additional feature
known as the Bendix® SMART ATC™ system. This system
monitors the accelerator pedal position (using J1939)
to help provide optimum traction and vehicle stability.
By determining the driver’s throttle input and adapting the
target slip of the drive wheels to the driving situation, the
Bendix SMART ATC system allows higher wheel slip when
the accelerator pedal is applied above a preset level.
The wheel slip allowed by the Bendix SMART ATC system
is decreased when driving through a curve for improved
stability.

Disabling ATC Engine Control and the Bendix
SMART ATC System
ATC Engine Control and the Bendix SMART ATC system
will be disabled under the following conditions:
1. In response to a serial communications request from
an off-board tool;
2. At power-up until the ECU detects a service brake
application;
3. If the ECU receives a J1939 message indicating that
the vehicle is parked;
4. If the dynamometer test mode is active. This may be
accomplished via an off-board tool or the diagnostic
Blink Code Switch; or
5. When certain DTC conditions are detected.
11

Optional ATC Mud/Snow (Off-Road) Mode

Drag Torque Control Functional Overview

In some road conditions, the vehicle operator may desire
additional drive wheel slip when ATC is active. The Bendix®
ESP® EC‑80™ Controller has an optional control mode to
permit this desired performance.

Bendix ESP EC‑80 Controllers have a feature referred to
as drag torque control which reduces wheel slip on a driven
axle due to driveline inertia. This condition is addressed
by increasing the engine torque to overcome the inertia.

The vehicle operator can activate the Mud/Snow function
with a switch on the dash panel. Alternately, a J1939
message may be used to place the vehicle in this mode.
The ATC/ESP Indicator Lamp will flash steadily at a rate
of once every 2.5 seconds to confirm that the ATC mud/
snow mode is engaged.

Drag torque control increases vehicle stability on lowtraction road surfaces during down-shifting or retarder
braking.

To exit the ATC Mud/Snow mode, depress and release the
ATC Mud/Snow switch.

BENDIX ESP EC‑80 ABS WITH STABILITY
CONTROL
Overview
The Bendix ESP system with the EC‑80 Controller reduces
the risk of rollovers, jackknifing and other loss-of-control
events. Bendix ESP EC‑80 Controllers include Roll
Stability Program (RSP®) and Yaw Control (YC) functions.
During operation, the Bendix ESP EC‑80 Controller
constantly compares performance models to the vehicle’s

actual movement, using wheel speed sensors; a lateral
acceleration sensor, a yaw rate sensor, and a steering
angle sensor. If the vehicle shows a tendency to leave an
appropriate travel path, or if critical threshold values are
approached, the system will intervene to assist the driver.

A Real World Example
Of How The RSP
System Operates:
Excessive speed for road
conditions creates forces
that exceed the threshold
at which a vehicle is likely
to rollover on a higherfriction surface.
A Real World Example Of How Yaw Control
Operates:
Excessive speed exceeds the threshold, creating a
situation where a vehicle is likely to spin and jackknife.

The system automatically reduces
engine torque and applies the
service brakes (based on the
projected rollover risk) to reduce
the vehicle speed, thereby
reducing the tendency to roll over.

FIGURE 12 - RSP EXAMPLE

The Bendix® Yaw Control system reduces engine throttle
and selectively applies brakes to reduce the tendency
to jackknife.
FIGURE 13 - YAW CONTROL EXAMPLE

Bendix® Roll Stability Program (RSP®)
Bendix RSP — an element of the overall Bendix® ESP®
system with the EC-80™ Controller — addresses rollover
conditions. In the case of a potential roll event, the ECU
will override the throttle and quickly apply brake pressure
at all wheel ends to slow the vehicle combination. The
level of braking application during an RSP event will be
proportional to roll risk. See Figure 12.

Yaw Stability
Yaw stability counteracts the tendency of a vehicle to spin
about its vertical axis. During operation — if the friction
between the road surface and the tires is not sufficient
to oppose lateral (side) forces — one or more of the tires
can slide, causing the truck/tractor to spin. These events
are referred to as either an "under-steer" situation (where
there is a lack of vehicle response to steering input due to
tire slide on the steer axle), or an "over-steer" (where the
tractor's rear end slides out due to tire slide on the rear axle)
situation. Generally, shorter wheelbase vehicles (tractors,
for instance) have less natural yaw stability, while longer
wheelbase vehicles (straight trucks, for instance) have
greater natural yaw stability. Factors that influence yaw
stability are: wheelbase, suspension, steering geometry,
weight distribution front to rear, and vehicle track width.

Yaw Control
Yaw control responds to a wide range of low- to highfriction surface scenarios including rollover, jackknife
and loss-of-control. It is the recommended system for all
power vehicles and especially critical for tractors pulling
trailers. In the case of vehicle slide (over-steer or understeer situations), the system will reduce the throttle and
then brake one or more of the “four corners” of the vehicle
(in addition to potentially applying the trailer brakes), thus
applying a counter-force to better align the vehicle with an
appropriate path of travel.
For example, in an over-steer situation, the system applies
the “outside” front brake; while in an under-steer condition,
the “inside” rear brake is applied. (See Figure 13)

IMPORTANT SAFETY INFORMATION
ABOUT THE BENDIX® ESP® SYSTEM

The Bendix ESP EC‑80 Controller may reduce
the vehicle speed automatically.
The Bendix ® ESP ® system can make the
vehicle decelerate automatically and can
slow the vehicle with or without the operator
applying the brake — and even when the
throttle is being applied.

To minimize unexpected deceleration and reduce the
risk of a collision, the operator must:
•

Avoid aggressive driving maneuvers, such as sharp
turns or abrupt lane changes at high speeds, which
might trigger the stability system; and

•

Always operate the vehicle safely, drive defensively,
anticipate obstacles and pay attention to road,
weather and traffic conditions. Bendix ABS, ATC
and ESP systems are no substitute for prudent,
careful driving.

Towing Doubles Or Triples May Reduce The
Effectiveness Of Stability Systems

The Bendix ESP system with the EC‑80 Controller is
designed and optimized for trucks and for tractors that
tow single trailers. If a tractor equipped with Bendix
ESP is used to power multiple trailer combinations
(known as “doubles” or “triples”) the effectiveness
of the Bendix ESP system may be greatly reduced.
Extremely careful driving is always required when
towing doubles or triples. Excessive speed and
aggressive maneuvers — such as sharp turns, sudden
steering inputs, or abrupt lane changes — should be
avoided.

Limitations Of Stability Systems
The effectiveness of the Bendix ESP system with the
EC‑80 Controller may be greatly reduced if:
• The load shifts due to improper retention, accident
damage, or the inherently mobile nature of some loads
(for example, hanging meat, live animals or partially
laden tankers),
• The vehicle has an unusually high — or off-set — center
of gravity (CG),
• One side of the vehicle drops off the pavement at an
angle that is too large to be counteracted by a reduction
in speed,
• The vehicle is used to haul double or triple trailer
combinations,
• If very rapid steering changes are attempted at high
speeds,
• There are mechanical problems with suspension
leveling of the tractor or trailer resulting in uneven loads,
• The vehicle is maneuvering on a high banked road
creating either additional side forces due to the weight
(mass) of the vehicle, or a deviation between expected
& actual yaw rates,
• Gusty winds are strong enough to cause significant
side forces on the vehicle and any towed vehicles.

To Maximize The Effectiveness Of The Bendix®
ESP® System with the EC‑80™ Controller:
• Loads must be properly secured at all times.
• Drivers need to exercise extreme caution at all times,
plus avoid sharp turns, sudden steering adjustments
or abrupt lane changes at high speeds, particularly if:

› the vehicle hauls loads that could shift;
› the vehicle or load has a high or off-set center of
gravity (CG) when loaded; or

› the vehicle tows doubles or triples.

If the Steering Angle Sensor is not recalibrated, the
yaw control system may not function properly, which
can result in incidents leading to loss of vehicle
control. See page 19 of this document for more
details on this procedure.

DYNAMOMETER TEST MODE

Truck Chassis Modifications
If the vehicle’s chassis components are altered (for
example, a wheel base extension or reduction; tag
axle addition or removal; a major body change such as
conversion of a tractor into a truck; or an axle, suspension,
or steering system component modification) the Bendix®
ESP® system must be disabled. Have a qualified mechanic
replace the Bendix ESP EC‑80 Controller with a Bendix®
ESP® ATC EC-80™ Controller and secure the X4 connector
(which will no longer be used). The ATC/ESP indicator
lamp would continue to function as an ATC indicator lamp,
and should be designated as ATC only.

Bendix ATC and ESP systems must be disabled prior
to conducting any dynamometer testing. When the
Dynamometer Test Mode is engaged, the Bendix ATC
EC‑80 Controller's brake control and engine control —
along with drag torque control and Bendix ESP system
functions — are disabled. This test mode is used to avoid
torque reduction or torque increase and brake control
activation when the vehicle is operated on a dynamometer
for testing purposes.
The Dynamometer Test Mode may be activated by pressing
and releasing the diagnostic Blink Code Switch five times
or by using a hand-held or PC-based diagnostic tool.

If a modified vehicle does not have the Bendix ®
ESP ® system disabled, serious vehicle braking
and performance issues could result, including
unnecessary ESP system interventions. This can
lead to a loss-of-control of the vehicle.
In addition, remove all cab signage (e.g. visor
labels, etc.) that were used to show that the Bendix
ESP system was installed. Make any necessary
notations in the vehicle manual(s), so that drivers do
not misunderstand which ABS options are installed
on the vehicle.

Sensor Location Modifications
The location and orientation of the Steering Angle Sensor
and Yaw Rate Sensor must not be altered. When servicing,
an identical component must be used in the same
orientation (using OEM brackets & torque requirements).
During installation follow the OEM leveling guidelines.

Steering Angle Sensor Re-Calibration
Whenever maintenance or repair work is performed to the
steering mechanism, linkage, steering gear, adjustment of
the wheel track, or if the steering angle sensor is replaced,
a recalibration of the Steering Angle Sensor must be
performed.

During Dynamometer Test Mode the ATC lamp remains ON.
Bendix ESP EC‑80 Controllers will remain engaged in
the Dynamometer Test Mode even if power to the ECU
is removed and re-applied. To exit the test mode, press
and release the Blink Code Switch three times, or use a
hand-held or PC-based diagnostic tool.

AUTOMATIC TIRE SIZE CALIBRATION
The ECU requires a precise rolling circumference ratio
between steer axle and drive axle tires in order for the
Bendix ABS, ATC, and ESP systems to perform in an
optimal manner. For this reason, a continuously monitoring
process takes place in which the precise ratio is calculated.
This calculated value is stored in the ECU memory
provided the following conditions are met:
1. Rolling-circumference ratio is within the permissible
range;
2. Vehicle speed is greater than approximately
12 mph/19 kph;
3. No acceleration or deceleration is taking place; and
4. There are no active speed sensor Diagnostic Trouble
Codes (DTCs).
The ECU is provided with a ratio value of 1.00 as a default
setting. If the automatic tire size alignment calculates a
different value, this is used to overwrite the original figure
in the memory. This process adapts the ABS and ATC
function to the vehicle.

Acceptable Tire Sizes
The speed calculation for an exciter ring with 100 teeth
is based on a default tire size of 510 revolutions per mile.
This figure is based on the actual rolling circumference of
the tires, which varies with tire size, tire wear, tire pressure,
vehicle loading, etc.
The ABS response sensitivity is reduced when the actual
rolling circumference is excessive on all wheels. For a 100
tooth exciter ring, the minimum number of tire revolutions
per mile is 376, and the maximum is 665. The ECU will
set a Diagnostic Trouble Code (DTC) if the number of
revolutions is out of this range.

Drive Axle/Additional Axle Wheel Speed Sensor
DTC
The Bendix ATC and ESP systems are disabled. In a four
sensor system, ABS on the affected wheel is disabled, but
ABS on all other wheels remains active.
In a six sensor system, ABS remains active by using input
from the remaining rear wheel speed sensor on the same
side.

ATC Modulator DTC
The Bendix ATC and ESP systems are disabled. ABS
remains active.

In addition, the size of the steer axle tires compared to
the drive axle tires also has to be within the ABS system
design. To avoid DTCs, the ratio of the effective rolling
circumference of the steer axle, divided by the effective
rolling circumference of the drive axle, must be between
0.85 to 1.15.

J1939 Communication DTC

The Bendix® ESP® system with the EC-80 Controller
effectiveness relies on the accuracy of vehicle speed.
If a major change on the tire sizes is made — such that
the odometer setting needs to be changed to correct
for the new tires — the Bendix ESP EC‑80 Controller's
setting of tire sizes must also be reprogrammed to
revised values.

Voltage DTC

SYSTEM IMPACT DURING ACTIVE
DIAGNOSTIC TROUBLE CODES (DTCs)

Steering Angle Sensor DTC

ABS PARTIAL SHUTDOWN
Depending on which component the DTC is detected,
the Bendix ABS, ATC, and ESP system functions may
be fully or partially disabled. Even with the ABS indicator
lamp illuminated, the Bendix ESP EC‑80 Controller may
still provide ABS function on wheels that are not affected.
The ABS system Controller should be serviced as soon
as possible.

The Bendix ATC and ESP systems are disabled. ABS
remains active.

ECU DTC
The Bendix ABS, ATC, and ESP systems are disabled.
The system reverts to normal braking.

While voltage is out of range, Bendix ABS, ATC, and ESP
systems are disabled. The system reverts to normal
braking. When the correct voltage level is restored, full
ABS and ATC function is available. The operating voltage
range is 9.0 to 17.0 VDC for 12 volt systems, and 20 to 33.5
volts for 24 volt systems.

The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

Yaw Rate/Lateral Acceleration Sensor DTC
The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

Brake Demand Pressure Sensor DTC
The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

Steer Axle ABS Modulator DTC

Load Sensor DTC

ABS on the affected wheel is disabled. ABS and ATC on
all other wheels remains active. The Bendix ESP system
with the EC‑80 Controller is disabled.

The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

Drive Axle/Additional Axle ABS Modulator DTC

Steer Axle Traction Control Valve (TCV) DTC

ATC is disabled. ABS on the affected wheel is disabled.
ABS on all other wheels remains active. The Bendix ESP
EC‑80 system is disabled.

Steer Axle Wheel Speed Sensor DTC
The wheel with the DTC is still controlled by using input
from the remaining wheel speed sensor on the steer axle.
ABS remains active on the rear wheels. The Bendix ATC
and ESP systems are disabled.

The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

Trailer Pressure Modulator Valve (PMV) DTC
The Bendix ESP system is disabled. Bendix ABS and ATC
systems remain active.

SYSTEM RECONFIGURATION
®

™

The Bendix ESP EC‑80 Controller is designed to
allow the technician to change the default system settings
(chosen by the vehicle OEM) to provide additional or
customized features.
Depending on the model, the customizable features include
ABS control settings, engine module communication etc.
Many of these settings can be reconfigured using a handheld or PC-based software, such as the Bendix® ACom®
Diagnostic software.

ECU RECONFIGURATION
Reconfiguring a Bendix ESP EC‑80 Controller may be
carried out by using the Blink Code Switch or by using a
hand-held or PC-based diagnostic tool.
Note: During the reconfiguration process — and
independently from any reconfiguration being carried out
by the technician — the Electronic Control Unit (ECU) will
automatically check the J1939 serial link and communicate
with other vehicle modules. In particular, if the serial link
shows that the vehicle has a retarder device present, the
ECU will configure itself to communicate with the retarder
device for improved ABS performance. For example, if
the ECU detects the presence of a retarder disable relay
during a reconfiguration, it will configure itself to control the
relay to disable the retarding device as needed.

Reconfiguration Using the Blink Code Switch
With ignition power removed from the Bendix ESP EC‑80
Controller, depress the Blink Code Switch. After the
ignition power is activated, depress and release the switch
seven (7) times to initiate a reconfiguration event.

Diagnostic Tool
A reconfiguration event may be initiated using a hand-held
or PC-based diagnostic tool to communicate with the ECU
over the SAE J1939 diagnostic link.

6S/5M Configuration
A Bendix ESP EC‑80 Controller will configure for 6S/5M
operation when a reconfiguration event is initiated, and the
ECU detects that an additional-axle Pressure Modulating
Valve (PMV) is wired as follows:
PMV Connector
Hold
Release
Common

ECU Connector
Right Additional Axle Hold
Left Additional Axle Release
Right Additional Axle Common

DATA STORAGE
Depending on the product type and version, Bendix ®
brand ECUs may store data related to troubleshooting,
diagnostics, service needs, vehicle system operating
status, and vehicle operator inputs. No personally
identifying data (e.g. name, gender or age) is recorded.
Bendix will not access stored ECU data or share it with
others except: with the consent of the vehicle owner; in
response to an official request by law enforcement or
other governmental agency; as part of Bendix’s defense
of litigation; or, as otherwise required by law. Data that
Bendix receives may also be used for research purposes
or made available to others for research purposes, where
a need is shown and the data is not linked to a specific
vehicle or owner.
Bendix brand antilock ECUs are not designed to store
data for purposes of accident reconstruction and Bendix
ACom Diagnostic Software is not intended to retrieve data
for purposes of accident reconstruction. Bendix makes no
representations as to the accuracy of data retrieved and
interpreted from Bendix ECUs for purposes of accident
reconstruction.

Troubleshooting: General
GENERAL SAFETY GUIDELINES
Read and follow the General Safety Guidelines shown on
page two (2) of this document.

REMOVAL OF THE BENDIX® ESP® EC‑80™
CONTROLLER ASSEMBLY
1. Turn vehicle ignition off.
2. Remove as much contamination as possible prior to
disconnecting electrical connections.
3. Note the Bendix ESP EC‑80 Controller assembly
mounting position on the vehicle.
4. Disconnect the electrical connectors from the Controller.
5. Remove and retain the mounting bolts that secure the
Controller.

The VIN of the vehicle is stored in the Bendix ESP
EC‑80 Controller's internal memory, and is crosschecked by the Electronic Control Unit (ECU) using
information obtained from other vehicle Controller(s).
If the VIN stored in the ECU does not match the VIN
obtained from the other vehicle Controller(s), the ECU
will generate an ECU Internal VIN Mismatch Diagnostic
Trouble Code (DTC).

INSTALLING A NEW BENDIX ESP EC‑80
CONTROLLER

When replacing the Bendix ESP EC‑80 Controller,
verify with the OEM service department that the unit
you are installing has the correct parameter set.
Failure to do so could result in a loss of features or
degraded ESP performance.
For further information, contact either the vehicle
manufacturer, Bendix, or your local authorized Bendix
distributor.
1. Position and secure the Bendix ESP EC‑80 Controller
in the original mounting orientation using the mounting
bolts retained during removal. Use no more torque than
is necessary to firmly secure the ECU into position.
Over-tightening the mounting hardware can cause
damage to the Bendix ESP EC‑80 Controller.
2. Reconnect the electrical connectors to the Bendix
EC‑80 Controller.
3. Apply power and monitor the Bendix ESP EC‑80
Controller power‑up sequence to Verify the proper
system operation.
See Troubleshooting: Wiring section beginning on page 45
for more information on wire harnesses.

Accordingly, do not attempt to move a Bendix ESP
EC‑80 Controller from one vehicle to another.

OBTAINING A NEW BENDIX® ESP® EC‑80™
CONTROLLER
Should the Bendix ESP EC‑ 80 Controller require
replacement, certain steps must be followed:
1. Record the vehicle model, VIN, year and date of
manufacture from the vehicle.
2. Record the part number of the Bendix ESP EC‑80
Controller.
3. Provide this information to your local OEM vehicle
service department to obtain a new Bendix ESP EC‑80
ECU. The OEM service department will install the same
parameter set in the new Controller that was loaded into
the original ECU at the vehicle OEM assembly facility.

The Bendix ESP system with the EC‑80 Controller is
validated with specific Bendix® brand components.
Always use Bendix brand replacement parts to
prevent compromising system per formance.
Bendix is not able to validate the safe and reliable
use of substitute or alternate components that
may be available from other manufacturers, since
suppliers of a non-Bendix brand ABS component
may implement design changes in their component
(without the knowledge or approval of Bendix) which
could negatively affect antilock system reliability
and braking performance issues.

STEERING ANGLE SENSOR MAINTENANCE
Service Checks:
1. Check all wiring and connectors. Some installations
also include an intermediate connector from the
steering angle sensor to the main vehicle wire harness.
Make sure all connections are free from visible damage.
2. Examine the sensor. Make sure the sensor, its
mounting screws, and the interface between the hub
and the steering column are not damaged.
Diagnostics:
The Bendix® brand steering angle sensor is only operational
in conjunction with a Bendix® ESP® EC‑80™ Controller. No
independent diagnostics can be performed on the sensor.
See pages 38-39 for Diagnostic Trouble Codes (DTCs)
associated with this device.

3. Assemble to column non-moving plate with three selflocking screws.
4. Tighten screws to steering column manufacturer's
recommended torque specification.
5. Reconnect the connector. Ensure that there will be no
force applied to the sensor because the connector is
pulling on the sensor body.
6. If the wire harness leading to the sensor is being
replaced, ensure that it is adequately tie wrapped
so that the full motion of the steering column can be
achieved without pulling apart the connectors.
7. Reinstall the column sheathing. The sensor is not
protected against dirt or water intrusion, so care
must be taken not to introduce these elements during
installation.

Removal:
1. Remove steering column sheathing.

STEERING ANGLE SENSOR CALIBRATION

2. Depending upon manufacturer, the steering angle
sensor could be located either near the steering wheel,
necessitating the removal of the steering wheel, or
near the joint to the vehicle steering mechanism,
necessitating the disconnection of this linkage.

The steering angle sensor calibration can only be achieved
when the sensor is powered by the Bendix ESP EC‑80
Controller. No stand-alone sensor calibration can be
carried out. The calibration procedure is performed
using Bendix ® ACom ® Diagnostic software V6.7.2.5 or
higher. See “Troubleshooting Diagnostic Trouble Codes:
Steering Angle Sensor (Bendix ® SAS‑60™)” for the
calibration procedure using this tool. The sensor must be
recalibrated using ACom Diagnostic Software after any of
these situations:

3. Unplug sensor cable assembly from body of sensor.
Squeeze the mounting tabs and pull gently on the
connector until it disengages.
4. Unscrew all three of the mounting screws that hold the
body of the sensor to the steering column body.
5. Slide the sensor over the column to remove. Take note
if the sensor label is facing upward or downward.
Installation:
1. Obtain a new sensor. The sensor is not repairable in
the field.
2. Slide the sensor over the column. The center hub of the
sensor must be aligned with the corresponding notch
in the column. Different column manufacturers may
implement this hub alignment in different ways. The
sensor label should be facing in the same direction as
the removed sensor.

• Replacement of the steering angle sensor;
• Any opening of the connector hub from the steering angle
sensor to the column;
• Any maintenance or repair work on the steering linkage,
steering gear or other related mechanism;
• Adjustment of the wheel alignment or wheel track; or
• After an accident that may have led to damage of the
steering angle sensor or assembly

If the steering angle sensor is not properly
recalibrated as needed, the yaw control system may
not function properly, which can result in a loss of
vehicle control.

YAW RATE/LATERAL ACCELERATION
SENSOR MAINTENANCE

Different generations of yaw rate/lateral acceleration
sensors are not compatible. Only replace these
sensors with exactly the same device.

Service Checks:
1. Check all wiring and connectors. Make sure all
connections are free from visible damage.
2. Examine the sensor. Make sure the sensor, its
mounting bolts, and the mounting bracket are not
damaged.
3. Check the vent hole in underbody of sensor housing.
The vent hole should remain free from paint and debris
at all times.
Diagnostics:
The yaw rate sensor is only operational in conjunction with
a Bendix® ABS, ATC or ESP® system with the EC‑80™
Controller. No independent diagnostics can be performed
on the sensor. See pages 40-41 for Diagnostic Trouble
Codes associated with this device.
Removal:
1. Unplug the sensor cable assembly from body of sensor.
The connector must be twisted and pulled gently to
release.
2. In some mounting configurations, the sensor can be
removed independently from its mounting bracket.
Otherwise, remove entire assembly, then remove
sensor from bracket.
3. Take note of the direction in which the connector is
pointed.
Installation:
1. Obtain a new sensor. The sensor is not repairable in
the field.

The location of the Yaw Rate Sensor on the vehicle,
the means of fastening the unit to the vehicle, and
the sensor's orientation, MUST NOT BE ALTERED.
When servicing, an identical component must be
used in the same orientation (using OEM brackets
& torque requirements). During installation,
follow the OEM leveling guidelines. If any of these
requirements are not followed, the Bendix ESP
system may not function properly, which can result
in incidents leading to loss of vehicle control.

2. Assembly yaw rate sensor housing to mounting bracket.
The bracket must be the same design as used on the
original vehicle configuration.
3. For Bendix® YAS-60™ Yaw Rate Sensors, the correct
fasteners are three M8 size bolts, and the fixing torque
should be 20 Nm (±2 Nm). For Bendix® YAS-70X™ Yaw
Rate Sensors, the correct fasteners are two M10 size
bolts (1.5 mm pitch angle), or OEM-supplied hardware,
and the fixing torque should be 46 Nm (±9 Nm). Note
that the Bendix YAS-70X sensor has two alternate
designs, one with an aligning post — see the kit
instruction sheet for more information. In all cases,
the connector should be facing in the same direction
as the removed sensor. The unit must not be installed
upside-down where there is a pressure-balancing hole.
4. The sensor should be as level as possible and parallel
to the road surface when installed on the vehicle.
5. Reconnect the connector. Ensure that there will be no
force applied to the sensor because the connector is
pulling on the sensor body.

When removing or installing the sensor, care must
be used to prevent damage. Do not strike or pry
the sensor. Do not use an impact tool to install the
mounting hardware.

Sensor Location Modifications
The location and orientation of the Yaw Rate Sensor must
not be altered. When servicing, an identical component
must be used in the same orientation (using OEM brackets
& torque requirements). During installation follow the OEM
leveling guidelines.
Yaw Rate Sensor Calibration:
The yaw rate sensor calibration can only be achieved via
the Bendix ESP system with the EC‑80 Controller. The
sensor must be recalibrated after any of these situations:
• Replacement of the sensor
• After an accident that may have led to damage of the
yaw rate sensor
The calibration procedure is performed using Bendix ®
ACom® Diagnostic Software V6.7.2.5 or higher.
See “Troubleshooting Diagnostic Trouble Codes: Yaw Rate
Sensor” for the calibration procedure.

BRAKE DEMAND SENSOR CALIBRATION
Calibration must be performed under the following conditions:

PRESSURE SENSOR INSTALLATION
REQUIREMENTS

•

After servicing any pressure sensor related Diagnostic
Trouble Codes (DTCs)
• Replacement of any sensor
The calibration procedure is performed using Bendix ®
ACom® Diagnostic Software V6.7.2.5 (or higher).

Service Checks:
1. Check all wiring and connectors. Make sure all
connections are free from visible damage.
2. Examine the sensor. Make sure the sensor and its
interface to the pressure location are not damaged.

See “Troubleshooting Diagnostic Trouble Codes: Brake
Demand Sensor/Load Sensor” for the calibration procedure.

Diagnostics:
See the test diagram supplied by the Bendix ACom
Diagnostic Software. The pressure sensor can be
independently diagnosed when supplied with a five volt
voltage supply to the B location and ground to the A
location shown in the test diagram. Signal output on
the C location should read approximately 0.5V if there is
no pressure applied. The signal output should increase
proportionately as pressure is applied, up to a maximum
of 4.5V at 150 psi.

Removal:
1. Unplug sensor cable assembly from body of sensor.
Pull gently on the mounting tab and connector until it
disengages.
2. Remove sensor from its pressure mounting using
approved air brake push in fitting tools.
Installation:
1. Obtain a new sensor. The sensor is not repairable in
the field.
2. Insert sensor into pressure fitting using approved tools.
3. Reconnect the connector. Ensure that there will be no
force applied to the sensor because the connector is
pulling on the sensor body.
4. If the wire harness leading to the sensor is being
replaced, ensure that it is adequately tie wrapped.
Pressure Sensor Calibration:
There is no need for pressure sensor calibration as long
as the part replaced is identical to the part removed and a
component approved for use with the Bendix® ESP® system
with EC-80™ Controllers. However, replacement of brake
demand sensors or clearing of demand pressure sensor
related DTCs require the following:
1. Use Bendix ACom Diagnostic Software V6.7.2.5 (or
higher) to clear the active pressure sensor DTC.
2. Carrying out the demand pressure sensor initialization
procedure which involves applying service brakes of
90 psi or greater for three (3) seconds (while stationary).
Once this procedure is carried out successfully, if there are
no other active DTCs, the ATC/ESP indicator lamp will no
longer be illuminated.

Troubleshooting: Blink Codes and Diagnostic Modes
ELECTRONIC CONTROL UNIT (ECU)
DIAGNOSTICS
®

™

The Bendix ESP EC‑80 Controller contains self-testing
diagnostic circuitry that continuously checks for the normal
operation of internal components and circuitry, as well as
external ABS components and wiring.

Active Diagnostic Trouble Codes (DTCs)
When an erroneous system condition is detected, the
Bendix ESP EC‑80 Controller:
1. Illuminates the appropriate indicator lamp(s) and
disengages part or all of the Bendix ABS, ATC and
ESP system functions. (See ABS Partial Shutdown,
on page 15.);
2. Places the appropriate DTC information in the Electronic
Control Unit (ECU) memory; and
3. Communicates the appropriate DTC information over
the serial communications diagnostic link as required.
Hand-held or PC-based diagnostic tools attach to the
vehicle diagnostic connector, typically located on or
under the dash (see Figure 14).

BLINK CODES
Blink codes allow a technician to troubleshoot ABS
problems without using a hand-held or PC-based
diagnostic tool. Instead, information about the ABS system
is communicated by the Bendix ESP EC‑80 Controller using
the ABS indicator lamp to display sequences of blinks.
Note: The Bendix ESP EC‑80 Controller will not enter the
diagnostic blink code mode if the wheel speed sensors
show that the vehicle is in motion. If the ECU is in the
diagnostic blink code mode and then detects vehicle
motion, it will exit the blink code mode.
In addition, by operating the Blink Code Switch as
described below, one of several diagnostic modes can be
entered. See Diagnostic Modes below.

Blink Code Switch Activation
When activating the Blink Code Switch:
1. Wait at least two seconds after “ignition on.” (Except
when entering Reconfiguration Mode - see System
Reconfiguration section on page 16.)
2. For the Bendix ESP EC‑80 Controller to recognize that
the switch is activated “on,” the technician must press
for at least 0.1 seconds, but less than five (5) seconds.
(If the switch is held for more than five (5) seconds, the
ECU will register a malfunctioning switch.)
3. Pauses between pressing the switch when a sequence
is required, (e.g. when changing mode) must not be
longer than two (2) seconds.
4. After a pause of three-and-a-half (3.5) seconds, the
ECU will begin responding with output information
blinks. See Figure 15 for an example.

FIGURE 14 - TYPICAL VEHICLE DIAGNOSTIC
CONNECTOR LOCATIONS (J1939)

FIGURE 15 - EXAMPLE OF A BLINK CODE MESSAGE
21

Blink Code Timing

DIAGNOSTIC MODES

The Bendix ® ESP ® EC‑80™ Controller responds with
a sequence of blink codes. The overall blink code
response from the Electronic Control Unit (ECU) is called
a “message.” Each message includes, depending on the
mode selected by the technician, a sequence of one or
more groups of blinks. Simply record the number of blinks
for each sequence and then use the troubleshooting index
on page 26 for active or inactive Diagnostic Trouble Codes
(DTCs) and you will be directed to the page that provides
troubleshooting information.

In order to communicate with the Bendix ESP EC‑80
Controller, there are several modes that the technician can
select to allow information to be retrieved, or other ECU
functions to be accessed.

NOTE:
1. Sequences of blinks illuminate the ABS indicator lamp
for half a second, with half-second pauses between
them.
2. Pauses between blink code digits are one-and-a-half
(1.5) seconds.
3. Pauses between blink code messages are two-and-ahalf (2.5) seconds.
4. The lamp remains on for five (5) seconds at the end of
messages.
Once the ABS indicator lamp begins displaying a sequence
of codes, it continues until all blink code messages have
been displayed and then returns to the normal operating
mode. During this time, the Bendix ESP EC‑80 Controller
will ignore any additional Blink Code Switch activation.
All DTCs, with the exception of voltage and J1939 DTCs,
will remain in an active state for the remainder of the
power cycle.
Voltage DTCs will clear automatically when the voltage
returns within the required limits. All Bendix ABS functions
will be re-engaged.
J1939 DTCs will clear automatically when communications
are re-established.

Diagnostic Modes
To enter the various diagnostic modes:
No. of
Times to
Press the
Blink Code
Switch

System Mode Entered

Active Diagnostic Trouble Code (DTC) Retrieval

Inactive DTC Retrieval

Clear Active DTCs

System Configuration Check

Dynamometer Test

Reconfigure ECU

* To enter the Reconfiguration Mode, the switch must be held
in before the application of ignition power. Once the power is
supplied, the switch is released and then pressed seven times.
FIGURE 16 - DIAGNOSTIC MODES

Active Diagnostic Trouble Code Mode
For troubleshooting, typically the Active and Inactive
DTC Retrieval Modes are used. The technician presses
the Blink Code Switch once and the ABS indicator lamp
flashes a first group of two codes, and if there are more
DTCs recorded, this is followed by a second set of codes,
etc. (See page 26 for a directory of these codes.) All
active DTCs may also be retrieved using a hand-held or
PC-based diagnostic tool, such as the Bendix® ACom®
Diagnostic Software.
To clear active DTCs (as problems are fixed), simply
clear (or “self-heal”) by removing and re‑applying ignition
power. The only exception is for wheel speed sensor
DTCs, which clear when power is removed, re-applied, and
the ECU detects valid wheel speed from all wheel speed
sensors. Alternately, codes may be cleared by pressing the
diagnostic Blink Code Switch three (3) times (to enter the
Clear Active Diagnostic Trouble Code Mode) or by using
a hand-held or PC-based diagnostic tool. Hand-held or
PC-based diagnostic tools are able to clear wheel speed
sensor DTCs without the vehicle being driven.

Inactive Diagnostic Trouble Code Mode
The Bendix ® ESP ® EC‑ 80™ Controller stores past
Diagnostic Trouble Codes (DTCs) and comments (such
as configuration changes) in its memory. This record is
commonly referred to as “event history.” When an active
DTC is cleared, the Electronic Control Unit (ECU) stores it
in the event history memory as an inactive DTC.
Using blink codes, the technician may review all inactive
DTCs stored on the ECU. The ABS indicator lamp
will display inactive diagnostic blink codes when the
diagnostic Blink Code Switch is depressed and released
two times. See page 26 for the index showing DTCs and
the troubleshooting guide page to read.
Inactive DTCs, and event history, may be retrieved and
cleared by using a hand-held or PC-based diagnostic tool,
such as the Bendix® ACom® Diagnostic Software.

1st Number System Power
1
2nd
Number

12 Volts
Wheel Speed Sensors

4 Sensors

6 Sensors

3rd Number Pressure Modulator Valves
4

4 Modulators

5 Modulators

6 Modulators

4th Number ABS Configuration
1

4S/4M or 6S/6M

6S/4M

6S/5M

5th Number Traction Control Configuration

Clearing Active DTCs

No ATC

The ECU will clear active DTCs when the diagnostic Blink
Code Switch is depressed and released three (3) times.

ATC Engine Control Only

ATC Brake Control Only

System Configuration Check Mode

Full ATC (Engine Control & Brake Control)

The ABS indicator lamp will display system configuration
information when the diagnostic Blink Code Switch is
depressed and released four times. The lamp will blink
out configuration information codes using the following
patterns. (See Figure 17).

6th Number Retarder Configuration

In this mode the ECU tells the technician — by means of a
series of seven (7) blink codes — the type of ABS system
that the ECU has been set up to expect. For example, if
the fourth blink code is the number two (2), the technician
knows that a 6S/4M sensor/modulator configuration has
been set.

7th Number Stability Configuration

Dynamometer Test Mode
The Dynamometer Test Mode is used to disable Bendix®
ESP® & ATC system functions when needed (e.g. when
performing any vehicle maintenance where the wheels are
lifted off the ground and moving, including dynamometer
testing). Note: For Bendix ESP and ABS EC‑80
Controllers, this mode will remain engaged even if
power to the ECU is removed and re-applied. To exit
the Dynamometer Test Mode, press and release the Blink
Code Switch three (3) times, or use a hand-held or PCbased diagnostic tool.

No Retarder

J1939 Retarder

Retarder Relay

J1939 Retarder, Retarder Relay

No Stability Program

Electronic Stability Program (ESP)

FIGURE 17 - SYSTEM CONFIGURATION CHECK

Reconfigure ECU Mode
Controller reconfiguration is carried out by using the
Reconfigure ECU Mode. (See page 16.)
Note: To enter the Reconfiguration Mode, the Blink Code
Switch must be held in before the application of ignition
power. Once the power is supplied, the switch is released
and then pressed seven times.

Other Methods
Troubleshooting and DTC clearing (as well as reconfigura‑
tion) may also be carried out using hand-held or PC-based
diagnostic tools such as the Bendix® Remote Diagnostic
Unit (RDU™), Bendix ACom Diagnostic Software, or similar
tools.

Troubleshooting: Using PC-Based or
Hand-Held Diagnostic Tools
BENDIX® ACOM® DIAGNOSTIC SOFTWARE

LED lights
illuminate
Diagnostic
Trouble
Codes
(10 locations
in total)

FIGURE 19 - THE BENDIX® REMOTE DIAGNOSTIC UNIT

Features of the Bendix RDU Tool
FIGURE 18 - BENDIX® ACOM® DIAGNOSTICS

Bendix ® ACom ® Diagnostic Software is a PC-based
program and is designed to meet RP-1210 industry
standards developed by the Truck Maintenance Council
(TMC). This software provides the technician with access
to all the available Bendix ® EC‑80™ ESP ® Controller's
diagnostic information and configuration capability,
including:
•

ECU information;

•

Diagnostic Trouble Codes (DTCs) and repair
information;

•

Configuration (ABS, ATC, and more);

•

Wheel speed information;

•

Perform component tests; and

•

Save and print information

Note: Bendix ACom Diagnostic Software V6.7.2.5 (or
higher) is required to calibrate the Steering Angle
Sensor, the Yaw Rate/Lateral Acceleration Sensor, the
Brake Demand Sensors and the Load Sensor.
When using ACom Diagnostic Software V6.7.2.5 (or
higher) to diagnose the Bendix ESP EC‑80 Controller, the
computer’s serial or parallel port needs to be connected
to the vehicle’s diagnostic connector.

BENDIX® RDU™ (REMOTE DIAGNOSTIC
UNIT)
The Bendix® RDU™ tool (Bendix part number K101596N001)
provides the technician with a visual indication of Antilock
Braking System (ABS) component Diagnostic Trouble
Code (DTC) information. Note: Previous versions of the
RDU tool are not compatible with the Bendix ESP EC‑80
Controller. The Bendix RDU tool is specifically designed
for use with Bendix® brand ABS systems and Bendix makes
no claims for its operation and/or usability with other brands
of ABS systems.
24

The Bendix RDU tool attaches to the 9-pin diagnostic
connector in the cab of the vehicle.
The Bendix RDU tool allows the technician to:

• Troubleshoot ABS system component problems using
DTC reporting via LEDs;

• Reset DTCs on Bendix ESP EC‑80 Controllers by
holding a magnet over the reset in the center of the RDU
tool for less than six (6) seconds; and

• Enter the Self-Configuration Mode used by Bendix ESP
EC‑80 Controllers by holding a magnet over the reset
area for greater than six (6) seconds but less than 30
seconds.
How the Bendix RDU Operates
See Figure 14 for typical vehicle connector locations.
When the Bendix RDU tool is plugged into the diagnostic
connector, all the LEDs will illuminate, and the green LED
will flash four (4) times to indicate communications have
been established.
If the Bendix ESP EC‑80 Controller has no active DTCs,
only the green LED will remain illuminated.
If the Bendix ESP EC‑80 Controller has at least one active
DTC, the RDU tool displays the first DTC by illuminating the
red LEDs, indicating the malfunctioning ABS component
and its location on the vehicle (See Figure 20.) If there
are multiple DTCs on the ABS system, the RDU tool will
display one DTC first, then — once that DTC has been
repaired and cleared — the next code will be displayed.

Typical Combination
Diagnostic Trouble Codes (DTCs) are:

• Right steer sensor
• Left steer sensor
• Right drive sensor
• Left drive sensor
• Right additional sensor
• Left additional sensor
• Right steer modulator
• Left steer modulator

• Right drive modulator
• Left drive modulator
• Right additional
modulator

• Left additional modulator
• Rear Axle Traction
modulator

• ECU
• Engine serial
communication

• MOD red LED illuminated, shows the "Common"
connection of one or more modulators is shorted to
battery or ground

• VLT (Flashing indicates either over- or under-voltage
condition)
To pinpoint the root cause and to ensure the system
Diagnostic Trouble Code is properly corrected the first time,
additional troubleshooting may be necessary.
Note: The Bendix ® RDU™ tool is not capable of diagnosing
certain Bendix ® ESP ® EC‑80™ system-specific DTCs
including additional sensors: steering angle sensors, yaw
sensors, pressure sensors, or modulator valves (trailer
pressure modulating valves or front axle traction control
valves.)
LED DIAGNOSTIC TROUBLE CODES
LFT -
RHT -
DRV -
ADD -
STR -
VLT -
ECU -

Left
Right
Drive Axle
Additional
Steer Axle
Power
ABS Controller

SEN - Wheel Speed
Sensor
MOD - Pressure Modulator
Valve
TRC - Traction Control

Example: If the
Diagnostic Trouble Code
is "Right Steer Axle
Sensor", the Bendix RDU
tool will display one green
and three red LEDs
FIGURE 20 - DIAGNOSTIC TROUBLE CODES AS
DISPLAYED ON THE BENDIX® RDU™ TOOL

LEDs
Green
VLT
Red
SEN
STR
RHT

Bendix® RDU™ Reset Function
The magnetic reset switch is located in the center top of
the Bendix RDU tool. Activation requires a magnet with
30 gauss minimum.
The reset operations are:
1. If the magnet is held over the switch for less than 6
seconds the "clear current DTCs" command is sent.
2. If the magnet is held over the switch for more than 6
seconds, but less than 30 seconds, the Bendix ABS
"self-configuration command" is sent.
Additionally, it is recommended at the end of any inspection
that the user switches off and restores the power to
the Bendix ESP EC‑80 Controller, then check the ABS
Indicator Lamp operation and Bendix RDU tool to see if
they indicate any remaining DTCs.
Bendix RDU Communication Problems
If the Bendix ESP EC‑80 Controller does not respond to the
RDU tool’s request for DTCs, the RDU tool will illuminate
each red LED in a clockwise pattern. This pattern indicates
the loss of communication and will continue until the Bendix
ESP EC‑80 Controller responds and communication has
been established.
Possible sources of communication problems are:
1. A problem with the J1939 link at the in-cab off-board
diagnostic connector (9 or 6 Pin);
2. The Bendix ESP EC‑80 Controller does not support
PID194;
3. No power is being supplied to the Bendix ESP EC‑80
Controller and/or the diagnostic connector;
4. The J1939 bus is overloaded with information and the
RDU can not arbitrate access; or
5. A malfunctioning Bendix RDU tool.

Other Information
For more information on Bendix ® ACom ® Diagnostics
Software or RP-1210 compliant tools, go to www.bendix.
com or visit your local authorized Bendix distributor.
See pages 56-62 for Appendices showing J1939 SID, FMI,
codes and their Bendix blink code equivalents.

www.bendix.com
For the latest information, and for free downloads of
the Bendix® ACom® Diagnostic Software, and its User
Guide, visit the Bendix website at www.bendix.com.
Bendix Technical Assistance Team
For direct telephone technical support, call the Bendix
technical assistance team at:
1-800-AIR-BRAKE (1‑800‑247‑2725 option 2, then 1),
Monday through Friday, 8:00 a.m. to 6:00 p.m. ET,
and follow the instructions in the recorded message.
E‑mail the Bendix Technical Assistance Team at:
techteam@bendix.com.

Active or Inactive Diagnostic Trouble Codes (DTCs):
INDEX
How to interpret the first digit of messages received
when Active or Inactive Diagnostic Trouble Code Mode
is entered.

1st
Blink
Code
Number

Troubleshooting Tests

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No DTCs (1,1)
2. . . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
3. . . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
4. . . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
5. . . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
6. . . . . . . . . . . . . . . . . . . . . . . . Power Supply - page 29
7. . . . . . . . . . Pressure Modulator Valves - pages 30-31
8. . . . . . . . . . Pressure Modulator Valves - pages 30-31
9. . . . . . . . . . Pressure Modulator Valves - pages 30-31
10. . . . . . . . . Pressure Modulator Valves - pages 30-31
11. . . . . . . . . . . . . . . . . . . . . . . . . . J1939 - pages 32-33
12. . . . . . . . . . . . . . . . . . . Miscellaneous - pages 34-35
13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECU - page 36
14. . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
15. . . . . . . . . . . . . Wheel Speed Sensors - pages 27-28
16. . . . . . . . . Pressure Modulator Valves - pages 30-31
17. . . . . . . . . Pressure Modulator Valves - pages 30-31

18. . . . . . . . Drive Axle Traction Control Valve - page 37

19. . . . . . . . Steer Axle Traction Control Valve - page 37

20. . . . . Trailer Pressure Modulator Valve - pages 30-31

21. . . . . . . . . . . . . Steering Angle Sensor - pages 38-39

22. . . . . . . . . . . . . . . . . Yaw Rate Sensor - pages 40-41

23. . . . . . . . . . . . Lateral Acceleration Sensor - page 42

24. . . . . . . . . . . Brake Demand/Load Sensors - page 43

25. . . . . . . . . . . . . . . . . Valves Miscellaneous - page 44

26. . . . . . . . . . . . . . . . J1939 ESP-Related - page 45-47

Example: For a message sequence of:
3, 2 12, 4
For the first sequence go to page 27 and
for the second sequence go to page 34.
See Page 56-62 for APPENDIX B: J1939 SPN and FMI Codes and their Bendix Blink Code Equivalents

Troubleshooting Diagnostic Trouble Codes (DTCs):
Wheel Speed Sensors
1st. Blink
Code

Location

Left Steer Axle Sensor

Right Steer Axle Sensor

Left Drive Axle Sensor

Right Drive Axle Sensor

Left Additional Axle Sensor

Right Additional Axle Sensor

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

Excessive Air Gap
Adjust the sensor to contact the exciter ring. Rotate the wheel and verify a minimum
of 0.25 VAC sensor output at ~ 0.5 RPS. Verify the condition of the sensor head.
Verify the mounting of the exciter ring and condition of the teeth. Verify the proper
bearing end-play. Verify the condition and retention of the clamping sleeve. Verify
the sensor lead routing and clamping.

Output Low at
Drive-off

Open or Shorted

Loss of Sensor Signal Adjust the sensor to contact the exciter ring. Rotate the wheel and verify a minimum

Verify 1500 – 2500 ohms is found across the sensor leads. Verify no continuity between
the sensor leads and ground or voltage. Verify no continuity between the sensor leads
and the other sensors. Check for corroded/damaged wiring or connectors between
the Electronic Control Unit (ECU) and the wheel speed sensor.
of 0.25 VAC sensor output at ~ 0.5 RPS. Verify the condition of sensor head. Verify
the mounting of the exciter ring and condition of the teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check for corroded/damaged wiring or connectors between
the ECU and the wheel speed sensor.

Wheel End

Verify the mounting of exciter ring and the condition of teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check the mechanical function of brake. Check for kinked
or restricted air hoses.

Erratic Sensor Signal

Adjust the sensor to contact the exciter ring. Rotate the wheel and verify a minimum
of 0.25 VAC sensor output at ~ 0.5 RPS. Verify the condition of sensor head. Verify
the mounting of the exciter ring and condition of the teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check for corroded/damaged wiring or connectors between
the ECU and the wheel speed sensor.

Tire Size Calibration

Verify the correct tire size as desired. Verify the proper tire inflation. Verify the correct
number of exciter ring teeth.

Configuration Error

The ECU is configured for four sensors, but it has detected the presence of additional
sensors. Verify the sensor wiring and the ECU configuration.

Speed Sensor Repair Tests:
1. Take all measurements at the Electronic Control Unit
(ECU) harness connector pins in order to the check wire
harness and sensor. Probe the connector carefully so
that the terminals are not damaged.
2. The wheel speed sensor measurements should read:
Location

Measurement

Sensor

1500 - 2500 Ohms

Sensor to voltage or ground

Open Circuit (no continuity)

Sensor output voltage

>0.25 of VAC sensor output at ~ 0.5 revs/sec.

3. Clear the DTC after the issue is corrected. The sensor
DTC will remain until the power is cycled to the ABS
ECU and vehicle is driven above 15 MPH or the DTC
was cleared using either the diagnostic Blink Code
Switch or a diagnostic tool.

Cab-mount ECU: Looking into
the wire harness connector

X 4

Connector

Wheel Speed Sensor
Location

X1
18 Way

Right Drive Axle (+)

Right Drive Axle (-)

Left Steer Axle (+)

Left Steer Axle (-)

X2
18 Way

X3
15 Way
(if ECU is
configured for
6 sensors)

Right Steer Axle (+)

Right Steer Axle (-)

Left Drive Axle (+)

Left Drive Axle (-)

Left Additional Axle (+)

Left Additional Axle (-)

Right Additional Axle (+)

Right Additional Axle (-)

Troubleshooting Diagnostic Trouble Codes (DTCs): Power Supply
1st. Blink
Code

Location

Power Supply

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

Battery Voltage Too
Low

Measure the battery voltage under load. Check the vehicle battery and associated
components. Check for damaged wiring. Check for damaged or corroded connectors
and connections.

Battery Voltage Too
High

Measure the battery voltage under load. Ensure that battery voltage is correct
for the Electronic Control Unit (ECU). Check the vehicle battery and associated
components. Check for damaged wiring. Check for damaged or corroded connectors
and connections.

Power Supply Tests:
1. Take all measurements at the ECU harness
connector.

3. Check for damaged wiring, damaged or corroded
connectors and connections.

2. Place a load (e.g. an 1157 stop lamp) across the
battery or ignition and ground connection, measure
the ignition and battery voltage with the load. Ignition
to Ground should measure between 9 to 17 VDC.
Battery to Ground should also measure between 9 to
17 VDC.

4. Check the condition of the vehicle battery and
associated components, verify that the ground
connection is good and tightened.
5. Check the alternator output for excessive noise.

Cab-mount ECU:
Looking into wire
harness connector
X 4

Connector
X1
18 Way

Power Supply Test

Ground

Ignition

Battery

Troubleshooting Diagnostic Trouble Codes (DTCs):
Pressure Modulator Valves (PMVs)
1st. Blink
Code

Left Steer Axle

Right Steer Axle

Left Drive Axle

Right Drive Axle

Left Additional Axle

Right Additional Axle

Trailer PMV

2nd.
Blink
Code

Location

Diagnostic Trouble
Code Description

Repair Information

Release Solenoid
Shorted to Ground

Verify no continuity between the PMV leads and ground. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from REL to HLD. Check
for corroded/damaged wiring or connectors between the Electronic Control Unit
(ECU) and PMV.

Release Solenoid
Shorted to Voltage

Verify no continuity between the PMV leads and voltage. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from REL to HLD. Check
for corroded/damaged wiring or connectors between the ECU and PMV.

Release Solenoid
Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the
ECU and PMV.

Hold Solenoid Shorted
to Ground

Hold Solenoid Shorted
to Voltage

Verify no continuity between the PMV leads and voltage. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD CMN, and 9.8 to 11 ohms from REL to HLD. Check for
corroded/damaged wiring or connectors between the ECU and PMV.

Hold Solenoid Shorted
to Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the
ECU and PMV.

CMN Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the ECU
and PMV. This is potentially a miswired or internal mechanical problem.

Configuration Error

A mis-match exists between the ECU configuration and the modulator installation
and wiring. Verify the PMV wiring and installation. Verify the ECU configuration.
Special Note regarding Trailer PMV: Pneumatic issues can result in this DTC being
set. Verify all lines are free from debris or other obstructions, kinks, etc.

Pressure Modulator Valve (PMV) Repair Tests:
1. Take all measurements at the Electronic Control Unit (ECU) harness
connector pins in order to check wire harness and PMV. Probe the
connector carefully so that the terminals are not damaged.
2. The pressure modulator resistance should read:
Location

Measurement

Release to Common

4.9 to 5.5 Ohms

Hold to Common

4.9 to 5.5 Ohms

Release to Hold

9.8 to 11.0 Ohms

Release, Hold, Common to
Voltage or Ground

Open Circuit (no continuity)

When troubleshooting modulator Diagnostic Trouble Codes (DTCs),
check inactive DTCs and the event history for over-voltage or
excessive noise DTCs. If one of these is found, troubleshoot these
DTCs first before the PMV.

Cab-mount ECU: Looking into
the wire harness connector

Connector

X2
18 Way

X3
15 Way (if
the ECU is
configured for
6 modulators)
X4
12 Way

Pin
1
2
3
4
6
7
9
10
13
12
16
17
4
6
7
9
10
13
6
9
12

PMV Location
Left Steer Axle Hold
Left Steer Axle Release
Left Steer Axle Common
Right Steer Axle Hold
Right Steer Axle Common
Right Steer Axle Release
Right Drive Axle Common
Right Drive Axle Hold
Right Drive Axle Release
Left Drive Axle Common
Left Drive Axle Hold
Left Drive Axle Release
Left Additional Axle Hold
Left Additional Axle Common
Left Additional Axle Release
Right Additional Axle Common
Right Additional Axle Hold
Right Additional Axle Release
Trailer PMV Hold
Trailer PMV Release
Trailer PMV Common

Troubleshooting Diagnostic Trouble Codes (DTCs):
J1939 Serial Communications
1st. Blink
Code
11
2nd.
Blink
Code

J1939

Diagnostic Trouble
Code Description

Repair Information

J1939 Serial Link

There is loss of communications between the Bendix ® ESP® EC‑80™ Controller and
other devices connected to the J1939 link. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors. Verify the Electronic Control
Unit (ECU) configuration. Check for other devices inhibiting J1939 communications.

J1939 Electronic
Retarder Time‑out
or Invalid Signal

Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of a retarder on the J1939 link. Verify the ECU
configuration. Verify that the retarder is configured to broadcast ERC1. Check for
other devices inhibiting J1939 communications.

J1939 Electronic Engine Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of ECU on the J1939 link. Verify the ECU
Controller 1 Time‑out
configuration. Verify the ECU is configured to broadcast EEC1. Check for other
or Invalid Signal
devices inhibiting J1939 communications.

J1939 Electronic Engine Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of Engine ECU on the J1939 link. Verify the ECU
Controller 2 Time‑out
configuration. Verify that there is an EEC2 broadcast from the address configured
or Invalid Signal
in the ABS ECU. Check for other devices inhibiting J1939 communications.

J1939 AIR Message
Time‑out or Invalid
Signal

ESP J1939 CAN
Message Time‑out

There is loss of communications between the EC‑80 ECU and the transmission
J1939 Transmission
Communication for HSA ECU over the J1939 link. Check for damaged or reversed J1939 wiring. Check
for damaged or corroded connectors. Verify the presence of transmission ECU on
J1939 link. Check for other devices inhibiting J1939 communications.
Time‑out or invalid data Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
on XBR
ECU configuration. Verify XBR message being broadcast from address 42.

Location:

Invalid pressure signals received from a vehicle Controller. Verify the proper
operation of brake demand sensors. Check wiring between brake demand sensors
and the vehicle Controller. Verify the proper programming of vehicle Controller.
Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other device inhibiting J1939 communications.
Invalid ESP messages on the J1939 link. Check for damaged or reversed J1939
wiring. Check for damaged or corroded connectors. Verify the presence of engine
and / or retarder on J1939. Verify the proper programming of engine and/or retarder.
Check for other devices inhibiting J1939 communications.

There is loss of communications between the Bendix EC‑80 Controller and the
transmission ECU over the J1939 link. Check for damaged or reversed J1939 wiring.
Check for corroded or damaged connectors. Verify the presence of engine ECU
on the J1939 link. Verify the ECU configuration. Check for other devices inhibiting
J1939 communications.
Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
ECU configuration. Verify AUX IO broadcast from address configured in EC‑80 ECU.

J1939 Electronic
Transmission Controller
1 Time‑out or Invalid
Signal

AUXIO CAN message
Time‑out

J1939 Hill Start Feature
Switch Signal Not
Available

Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Verify the ECU configuration. Verify EBC1 being broadcast with a valid
SPN 577 parameter. Check for other devices inhibiting J1939 communications.

J1939 CAN Message
related to ESP is
incomplete

Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
ECU configuration. Verify ESP messages.

2nd.
Blink
Code
15

Diagnostic Trouble
Code Description

Repair Information

J1939 Electronic Engine There is loss of communications between the Bendix ® ESP® EC‑80™ Controller and
Controller 3 Time‑out or the engine Electronic Control Unit (ECU) over the J1939 link. Check for damaged
or reversed J1939 wiring. Check for corroded or damaged connectors. Verify the
Invalid Signal
presence of engine ECU on the J1939 link. Verify the ECU configuration. Check
for other devices inhibiting J1939 communications.
There is loss of communications between the Bendix EC‑80 Controller and the
J1939 Electronic
Transmission Controller transmission ECU over the J1939 link. Check for damaged or reversed J1939 wiring.
Check for corroded or damaged connectors. Verify the presence of engine ECU
2 Time‑out
on the J1939 link. Verify the ECU configuration. Check for other devices inhibiting
J1939 communications..
Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
J1939 EAC1 Time‑out
or reversed J1939 wiring. Check for damaged or corroded connectors. Verify that
or Invalid Signal
the message is being transmitted. Verify data for Electronic Axle Controller 1 is
correct. Verify the ECU configuration.
Verify
60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
CAN Message
reversed
J1939 wiring. Check for damaged or corroded connectors. Verify that the
CGW_C1 Time‑out or
message is being transmitted. Verify that the data for differential lock(s) is correct.
invalid signal
Verify the ECU configuration.
Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
CAN Message
or reversed J1939 wiring. Check for damaged or corroded connectors. Verify that
ASC1_CLCS Time‑out
the message is being transmitted. Verify that the data for Air Suspension Control 1
or invalid signal
is correct. Verify the ECU configuration.
Verify
60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
J1939 CCVS Time‑out
reversed
J1939 wiring. Check for damaged or corroded connectors. Verify message
or Invalid Signal
is being transmitted. Verify the ECU configuration.

J1939 TCO
(Tachograph)
Time‑out

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
reversed J1939 wiring. Check for damaged or corroded connectors. Verify message
is being transmitted. Verify the ECU configuration.

J1939 Address Conflict
ABS Address

Verify only one ABS ECU is connected on J1939 bus, broadcasting OBh (equals
13 decimal).

J1939 Address Conflict
TPMS Address

Verify only one TPMS ECU is connected on J1939 bus, broadcasting 33h.

J1939 Proprietary XBR
Message Out of Range

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
or reversed J1939 wiring. Check for damaged or corroded connectors. Check for
messages being transmitted/received.

J1939 CAN Messages
Are Not Being
Transmitted/Received

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
or reversed J1939 wiring. Check for damaged or corroded connectors. Check for
messages being transmitted/received.

J1939 Troubleshooting Tests:

Cab-mount ECU:

1. Take all measurements at ECU harness
connector.

Looking into wire harness connector

2. Check for damaged or reversed J1939
wiring.
3. Check for corroded or damaged wiring
connector problems such as (opens or
shorts to voltage or ground).
4. Check for other J1939 devices which
may be loading down (inhibiting) J1939
communication.

X 4

Connector Pin J1939
X1
18 Way

J1939 Low

J1939 High

Troubleshooting Diagnostic Trouble Codes (DTCs): Miscellaneous
1st. Blink
Code 12
2nd.
Blink
Code

Location:
Miscellaneous
Diagnostic Trouble
Code Description

Repair Information

Stop Lamp Switch
Not Detected

The Electronic Control Unit (ECU) has not detected the presence of the stop lamp switch
since ignition power was applied (note that stop lamp switch input may be applied to
the Bendix ® ESP ® EC‑80™ Controller using either hard-wire input or J1939). Apply
and release service brake. Check for brake switch input into ECU (see system wiring
schematic). With service brake released, check for presence of the stop lamp bulb.
With service brake applied, verify system voltage is now present at the stop lamp switch
input to the ECU. Check for damaged wiring between ECU, stop lamp switch and bulb.
Check for corroded or damaged connectors. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors on J1939 link. Verify the presence
of engine ECU on the J1939 link. Verify the ECU configuration.

Stop Lamp Switch
Defective

Apply and release service brake. Check for brake switch input into ECU (see system
wiring schematic). With service brake released, check for presence of the stop lamp bulb.
With service brake applied, verify system voltage is now present at the stop lamp switch
input to the ECU. Check for damaged wiring between ECU, stop lamp switch and bulb.
Check for corroded or damaged connectors. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors on J1939 link. Verify the presence
of engine ECU on the J1939 link. Verify the ECU configuration.

ATC or ESP Disabled
or Dynamometer Test
Mode Active

ATC or ESP is disabled. ECU has been placed in the Dynamometer Test Mode by either
the diagnostic Blink Code Switch or a hand-held or PC-based diagnostic tool. Clear
DTCs to exit Dynamometer Test Mode.

Retarder Relay Open
Circuit or Shorted to
Ground

Verify vehicle contains a retarder relay. Verify the ECU configuration. Check wiring
between ECU and retarder relay. Verify no continuity between retarder disable output of
Bendix ESP EC‑80 Controller and ground. Verify condition and wiring of the retarder relay.

Retarder Relay Circuit
Shorted to Voltage

Check wiring between ECU and retarder relay. Verify no continuity between retarder
disable output of Bendix ESP EC‑80 Controller and voltage. Verify condition and wiring
of the retarder relay.

ABS Indicator Lamp
Circuit DTC

Check operation of diagnostic Blink Code Switch. Check wiring of diagnostic Blink Code
Switch (verify ABS wire is not grounded where used) and ABS Indicator Lamp. Verify
ABS Indicator Lamp ground input. On some vehicles with multi-plex dashes, the ground
wire may not be present - see ECU 19 DTC.

PMV Common
Shorted to Ground

Verify no continuity between the Release, Hold and CMN of all Pressure Modulator Valves
(PMVs), Traction Control Valve (TCV), HSA, Diff Lock Solenoid and ground. Check for
corroded/damaged wiring or connectors between the ECU and CMN of all PMVs, TCV,
and Diff Lock Solenoid. See the extended troubleshooting for this code in Appendix A.

PMV Common
Shorted to Voltage

Verify no continuity between the Release, Hold and CMN of all PMVs, TCV, HSA, Diff
Lock Solenoid and voltage. Check for corroded/damaged wiring or connectors between
the ECU and CMN of all PMVs, TCV, and Diff Lock Solenoid.

ATC Disabled to
Prevent Brake Fade

The Bendix® ATC (Automatic Traction Control) system is temporarily disabled to
prevent excessive heating of the foundation brakes.

Wheel Speed
Sensors Reversed on
an Axle

Sensors are reversed (left to right) on one of the axles. Verify the proper installation,
connection, and wiring of the sensors.

Sensor CAN Supply
Voltage Error

Incorrect supply voltage for the Steering Angle Sensor (SAS) and the Yaw Rate sensor.
Verify the proper voltage at the sensor connectors. Verify the wiring between the ECU
and the sensors. Verify the proper output voltage from ECU. Note: When checking for
voltage at YAW/LAS & SAS, the voltage will only be present momentarily at key ON.

ABS disabled due to
off-road mode

The ABS indicator lamp will be flashing, indicating the ECU is in the off-road ABS mode.
Remove and re-apply ignition power.

Maximum number
of PMV cycles
exceeded

Replace all PMV valves and clear the DTC.

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

Maximum Number
of TCV Cycles
Exceeded

ESP Sensor Voltage
Out of Range

Incorrect supply voltage is detected for the Bendix ® SAS-60™ and the Yaw Rate sensor.
Verify the proper voltage at sensor connectors. Verify wiring between the Electronic
Control Unit (ECU) and the sensors. Verify the proper output voltage from ECU.
Note: When checking for voltage at YAW/LAS & SAS, the voltage will only be present
momentarily at key ON.

HS Feature Lamp
Open or Shorted
to Ground

Verify no continuity between the Hill Start / Hill Start Assist lamp and ground. Verify
continuity between the lamp and the ECU. Check the wiring between the lamp and the
ECU. Check the lamp and the condition of its wiring.

HS Feature Solenoid
Open or Shorted
to Ground

The Hill Start / Hill Start Assist solenoid is shorted to ground or has a broken wire. Verify
no continuity between the solenoid and ground. Check for corroded/damaged wiring or
connectors between the ECU and the solenoid.

HS Feature Solenoid
Shorted to Voltage

Verify no continuity between the Hill Start / Hill Start Assist Solenoid and voltage. Check
for corroded/damaged wiring or connectors between the ECU and Solenoid.

Brake Lamp Input
Mismatch With Brake
Lamp Output

There is a brake lamp input mismatch with the brake lamp output.

Replace all Traction Control Valve (TCV) valves and clear the Diagnostic Trouble Code
(DTC).

Air system/
Mechanical
Component

Verify brakes are operating correctly. Verify that there is not over-braking at one or more
wheel end(s). Check the pneumatic plumbing and the exhaust port of the PCVs, TCVs,
and relay valves and confirm that the air is being exhausted from all brake chambers.
Verify tire sizes on the vehicle match the ABS ECU configuration. Verify wheel speed
sensors and tone ring are properly adjusted and in good condition.

Air system/
Mechanical
Component

Verify that the tires are in good condition. Verify that no pneumatic hoses are twisted
or kinked. Verify that the brakes are operating correctly. Verify that the wheel speed
sensor and tone ring are properly adjusted. Verify tire size.

ESP Disabled due to
Off Road Mode

Electronic Stability has been disabled due to the vehicle being in the ABS or ATC off
road mode. Cycle ABS Off Road or ATC Mud snow switch.

HS Feature Lamp
Shorted to Voltage

Verify that there is no resistance measured between the battery and HSA lamp output
of the ECU. Check the wiring between the ECU and the Hill Start / Hill Start Assist
lamp. Check the lamp and condition of its wiring.

I/O 2 or 3 Shorted
High (EC‑80-ATC)
OR
I/O 2 or 3 shorted
High or Stop Lamp
Output error (ESP
EC‑80)

Check for a short-circuit condition between voltage and the I/O 2 and I/O 3 circuits.

HS Feature Solenoid
Open Circuit

Verify resistance across the Hill Start / Hill Start Assist solenoid. Check the ECU and
HSA solenoid for corroded or damaged wiring and/or connectors.

eTrac Valve Solenoid
Shorted to Voltage

Verify the resistance between voltage and the Bendix ® eTrac™ solenoid is open. Check
for corroded or damaged wiring or connectors between the ECU and the eTrac solenoid.

eTrac Valve Solenoid
Shorted to Ground

Verify the resistance between ground and the Bendix eTrac solenoid is open. Check for
corroded or damaged wiring or connectors between the ECU and the eTrac solenoid.

Reserved

Invalid ABS Warning
Lamp Configuration

Check X1-12 if pin/wire installed. X2-12 should have no terminal or connection. ABS
Warning Lamp is controlled via J1939.
35

Troubleshooting Diagnostic Trouble Codes (DTCs): ECU
1st. Blink
Code
13

Location:
ECU

2nd
Blink
Code

Diagnostic
Trouble Code
Description

Repair Information

(With HEX
designation)

ECU DTC (5FC)

ECU DTC (5CD)

ECU DTC (10)

ECU DTC (2678C)

ECU DTC (1C)

ECU DTC (6CD)

Configuration
mismatch

ECU DTC (56)

ECU DTC (CAC3)

ECU DTC (5F3)

ECU DTC (F1A)

ECU DTC (F14)

Configuration
mismatch

ECU DTC (C6)

ECU DTC (CF)

ECU DTC (C0)

ECU DTC (C8C)

ECU DTC (CC)

ECU DTC (63)

ECU DTC (6E)

ECU DTC (6C)

ECU DTC (63C)

ECU Internal VIN
Mismatch

The ECU internally-stored VIN does not match the VIN of the vehicle.
Ensure that the ECU is installed on the correct vehicle. Verify the
ECU programming. Verify engine programming.

Valve Configuration
Mismatch

Check for damaged or corroded connectors. Check for damaged
wiring. Clear DTCs. If DTCs return, contact the Bendix Tech Team
at 1-800-AIR-BRAKE (1-800-247-2725, option 2, then 1) for further
troubleshooting assistance.

ECU DTC (7CD)

ECU DTC (5D)

Check for damaged or corroded connectors. Check for damaged
wiring. Clear Diagnostic Trouble Codes (DTCs). If DTCs return,
contact the Bendix Tech Team at 1-800-AIR-BRAKE (1-800-247-2725,
option 2, then 1) for further troubleshooting assistance.

Verify components installed match the Electronic Control Unit (ECU)
configuration.

Verify components installed match ECU configuration.
Check for damaged or corroded connectors. Check for damaged
wiring. Clear DTCs. If DTCs return, contact the Bendix Tech Team
at 1-800-AIR-BRAKE (1-800-247-2725, option 2, then 1) for further
troubleshooting assistance.
Parameter file was not downloaded. To verify that the vehicle specific
parameters have been loaded, contact Bendix for more information
at 1-800-AIR-BRAKE (1-800-247-2725).

Check for damaged or corroded connectors. Check for damaged
wiring including power and ground wiring. Clear DTCs. If DTCs return,
contact the Bendix Tech Team at 1-800-AIR-BRAKE (1-800-247-2725,
option 2, then 1) for further troubleshooting assistance.

Troubleshooting Diagnostic Trouble Codes (DTCs):
Traction Control Valves (TCV)
1st. Blink
Code

Location

Drive Axle Traction Control Valve

Steer Axle Traction Control Valve

NOTE: When troubleshooting Traction
Control Valve DTCs, it may be useful to look
for a potential connection between them and
ECU DTCs (in particular, DTCs 13-8 and 13-18
shown on page 36).
2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

TCV Solenoid Shorted
to Ground

Verify 7 to 19 ohms between Traction Control Valve (TCV) and TCV
common. Verify no continuity between TCV leads and ground. Check
for corroded/damaged wiring or connectors between the ECU and TCV.

TCV Solenoid Shorted
to Voltage

Verify 7 to 19 ohms between TCV and TCV common. Verify no continuity
between TCV leads and voltage. Check for corroded/damaged wiring or
connectors between ECU and TCV.

TCV Solenoid Open
Circuit

Verify 7 to 19 ohms between TCV and TCV common. Check for corroded/
damaged wiring or connectors between ECU and TCV.

TCV Configuration Error

The ECU is not configured for ESP or ATC, but has detected the presence
of a TCV. Verify TCV wiring. Inspect for the presence of a TCV. Verify
the ECU configuration.

ATR valve inspections should include: looking for kinked air hoses; inside the harness socket on the valve for
removed or corroded connector pins; and a test to verify that the ATC valve solenoids are functioning correctly.

Traction Control Valve (TCV) Repair Tests:
1. Take all measurements at ECU harness connector pins in order to check wire harness
and traction control valve. Probe the connector carefully so that the terminals are not
damaged.
2. Tractor Control Valve resistance measurements should read:
Location

Measurement

TCV to TCV Common

7 to 19 Ohms

Release, Hold, Common
to Voltage or Ground

Open Circuit (no continuity)

Cab-mount ECU:
Looking into wire
harness connector
X 4

Connector Pin Traction Control Test
X1
18 Way

Drive Axle Traction
Control Valve Common

Drive Axle Traction
Control Valve

Connector Pin Traction Control Test
X3
15 Way

Steer Axle Traction
Control Valve Common

Steer Axle Traction
Control Valve

Troubleshooting Diagnostic Trouble Codes (DTCs):
Steering Angle Sensor (SAS) [Bendix® SAS-60™ Sensor]
1st. Blink
Location:
Code
Steering Angle Sensor
21

2nd.
Blink
Code

Diagnostic Trouble
Code Description

SAS Not Calibrated

Steering Angle Sensor (SAS) has not been calibrated.
Perform SAS calibration procedure.

SAS Calibration
in Progress

SAS calibration procedure is underway.

SAS Static Signal

SAS signal incorrect. Verify the proper installation of the SAS. Verify proper wiring
between the Electronic Control Unit (ECU) and the SAS. Check SAS output.

SAS Signal Out
of Range

SAS signal incorrect. Verify the proper installation of the SAS. Verify proper wiring
between the ECU and the SAS. Check SAS output. Perform SAS calibration
procedure.

SAS Signal Reversed

SAS signal is reversed. Verify the proper installation of the SAS. Verify proper
wiring between the ECU and the SAS. Check SAS output.

SAS Invalid Signal

SAS signal is invalid. Verify the proper installation of the SAS. Verify proper wiring
between the ECU and the SAS. Check SAS output. Verify that correct SAS is
being used.

SAS Gradient Error

SAS signal is invalid. Verify the proper installation of the SAS. Verify proper wiring
between the ECU and the SAS. Check SAS output. Verify that correct SAS is
being used.

SAS CAN Time‑out

Loss of CAN communications between the ECU and the SAS. Verify proper wiring
between the ECU and the SAS. Check SAS output.

SAS Long Term
Calibration Error

SAS calibration error. Verify the proper installation of the SAS. Verify proper wiring
between the ECU and the SAS. Check SAS output. Verify that correct SAS is being
used. Verify proper ECU programming. Perform SAS calibration procedure.

SAS Plausibility Check

ECU has detected incorrect SAS signal as compared to the Yaw Rate sensor signal.
Verify the proper installation of the SAS. Verify proper wiring between the ECU and
the SAS. Check SAS output. Verify that correct SAS is being used. Verify proper
ECU programming. Perform SAS calibration procedure.

SAS detected but
not configured

Verify the ECU is configured for ESP.

Repair Information

Troubleshooting Diagnostic Trouble Codes (DTCs):
Steering Angle Sensor (SAS) [Bendix® SAS-60™ Sensor]
(continued)

Steering Angle Sensor (SAS) Connector

Looking into wire harness connector
(Note: When checking for voltage at YAW/LAS & SAS, the voltage will only be present momentarily at key ON).

Steering Angle Sensor Tests
1. Measure resistance between input voltage and ground
at the sensor wiring harness connector.

Verify continuity between the Electronic Control Unit
(ECU) and SAS‑60 and Yaw Rate Sensor (typically
YAS-70 or YAS-60).
Connector
SAS
ECU
12 Way

Function

Voltage Input

Ground Input

Power

Common

4. To perform a calibration procedure of the Steering Angle
Sensor, Bendix® ACom® Diagnostic Software V6.7.2.5
or higher is required. Using the program, select the
“Configuration” option, followed by the “Calibrate”
option. The following screen should be displayed.

2. Verify wiring between the Steering Angle Sensor and
the ECU.
SAS Wire
Harness
Terminal

ECU Wire
Harness
Terminal

Measurement

5. Follow the prompts to perform a calibration of the
Steering Angle Sensor.

Verify Continuity

6. To test the Steering Angle Sensor, ACom V6.7.2.5, or
higher, is required. Using Bendix ACom V6.7.2.5 or
higher, select the “Component Test” option, followed
by the “ESP Test” option. The following screen should
be displayed.

3. Verify wiring between the Steering Angle Sensor and
power/ground.
SAS Wire Harness
Terminal

Measurement

4 to Voltage &
Ground

Verify open circuit (no
continuity)

3 to Voltage &
Ground

Verify open circuit (no
continuity)

7. Follow the prompts to perform a test of the Steering
Angle Sensor.

Troubleshooting Diagnostic Trouble Codes (DTCs):
Yaw Rate Sensor (YRS)
1st. Blink
Code
22
2nd.
Blink
Code

Location:
Yaw Rate Sensor

Diagnostic Trouble
Code Description

Repair Information

YRS Signal Out of
Range

The YRS signal is incorrect. Verify the proper installation of the YRS. Verify proper
wiring between the Electronic Control Unit (ECU) and the YRS. Check the YRS output.
Perform the YRS calibration procedure.

YRS Sensor
Reversed Signal

The YRS signal is reversed. Verify the proper installation of the YRS. Verify the wiring
between the ECU and the YRS. Check the YRS output.

YRS Invalid Signal

YRS Gradient Error

YRS CAN Time‑out

Loss of CAN communications between the ECU and the YRS. Verify proper wiring
between the ECU and the YRS. Check the YRS output.

YRS Static BITE
Error

The YRS signal fails static self-test. Verify the proper installation of the YRS. Verify
proper wiring between the ECU and the YRS. Check the YRS output. Verify that
correct YRS is being used. Verify proper ECU programming. Perform the YRS
calibration procedure.

YRS Dynamic BITE
Error

The YRS signal fails self-test conducted while vehicle is in motion. Verify the proper
installation of the YRS. Verify proper wiring between the ECU and the YRS. Check the
YRS output. Verify that correct YRS is being used. Verify proper ECU programming.
Perform the YRS calibration procedure.

YRS Fast Calibration
Error

The YRS signal is invalid. Verify the proper installation of the YRS. Verify proper
wiring between the ECU and the YRS. Check the YRS output. Verify that correct
YRS is being used.

There is a YRS calibration error. Verify the proper installation of the YRS. Verify proper
wiring between the ECU and the YRS. Check the YRS output. Verify that correct YRS is
being used. Verify proper ECU programming. Perform the YRS calibration procedure..

YRS Static
Calibration Error

YRS Normal
Calibration Error

YRS Plausibility
Check (Ref Yaw
Rate)

YRS Plausibility Error
(Inside Model Based
Limits)

YRS Plausibility
Error (Outside Model
Based Limits)

YRS - SAS Signal
Cross-check
Incomplete

The ECU (if configured) must confirm that YRS and SAS signals match. The vehicle
must be exposed to an S-shaped driving maneuver for this DTC to automatically clear.
If the DTC does not clear even after the S-shaped driving maneuver, check and correct
the orientation of the YRS and then repeat the maneuver.

YRS - Vibration
Detected

Inspect the YRS mounting and verify it is securely mounted. Note that the YRS may
not be relocated from the OEM-installed position on vehicle without written Bendix
Engineering approval.

YRS Detected But
Not Configured

Verify that the ECU is configured for ESP.

There is a YRS calibration error. Verify the proper installation of the YRS. Verify proper
wiring between the ECU and the YRS. Check the YRS output. Verify that correct YRS
is being used. Verify proper ECU programming. Perform the YRS calibration procedure.

The ECU has detected an incorrect YRS signal. Verify the proper installation of the
YRS. Verify proper wiring between the ECU and the YRS. Check the YRS output.
Verify that correct YRS is being used. Verify proper ECU programming. Perform the
YRS calibration procedure.

Troubleshooting Diagnostic Trouble Codes (DTCs):
Yaw Rate Sensor (YRS) (continued)

Yaw Connector

Looking into wire harness connector
(Note: When checking for voltage at YAW/LAS & SAS, the voltage will only be present momentarily at key ON.).

Yaw Rate Sensor Tests
1. Verify continuity between the Electronic Control Unit
(ECU) and the Yaw Rate Sensor (typically YAS-70 or
YAS-60).
Connector
YRS
ECU
12 Way

Function

Voltage Input

Ground Input

Power

Common

4. To perform a calibration procedure of the Yaw Rate
Sensor, ACom ® Diagnostic Software V6.7.2.5 (or
higher) is required. Using the program, select the
“Configuration” option, followed by the “Calibrate”
option. The following screen should be displayed.

2. Verify wiring between the Yaw Rate Sensor and the
ECU.
YRS Wire
Harness
Terminal

ECU Wire
Harness
Terminal

Measurement

Verify Continuity

3. Verify wiring between the Yaw Rate Sensor and power/
ground.
YRS Wire Harness
Terminal

Measurement

4 to Voltage &
Ground

Verify open circuit (no
continuity)

3 to Voltage &
Ground

Verify open circuit (no
continuity)

5. Follow the prompts to perform a calibration of the Yaw
Rate Sensor.
6. To test the Yaw Rate Sensor, ACom V6.7.2.5, or higher,
is required. Using Bendix ACom V6.7.2.5 or higher,
select the “Component Test” option, followed by the
“ESP Test” option. The following screen should be
displayed.
7. Follow the prompts to perform a test of the Yaw Rate
Sensor.

Troubleshooting Diagnostic Trouble Codes (DTCs):
Lateral Acceleration Sensor (LAS)
1st. Blink
Code
23

Location:
Lateral Acceleration
Sensor

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

LAS Signal Out of
Range

LAS signal incorrect. Verify the proper installation of the YRS/LAS. Verify
proper wiring between the Electronic Control Unit (ECU) and the YRS/LAS.
Check YRS/LAS output. Perform LAS calibration procedure.

LAS Calibration in
Progress

LAS calibration procedure is underway.

LAS Static
Calibration Error

LAS calibration error. Verify the proper installation of the YRS/LAS. Verify
proper wiring between the ECU and the YRS/LAS. Check YRS/LAS output.
Verify that correct YRS/LAS is being used. Verify proper ECU programming.
Perform LAS calibration procedure.

LAS Long Term
Calibration Error

LAS Plausibility
Error (Inside ECUspecific Limits)

ECU has detected an incorrect LAS signal. Verify the proper installation of the
YRS/LAS. Verify proper wiring between the ECU and the YRS/LAS. Check
YRS/LAS output. Verify that correct YRS/LAS is being used. Verify proper
ECU programming. Perform LAS calibration procedure.

LAS Plausibility
Error (Outside ECU
–specific Limits)

Erratic ESP Sensor
Signal

ECU has detected an erratic signal. Verify the proper installation of the YRS/
LAS. Verify proper wiring between the ECU and the YRS/LAS. Check YRS/
LAS output. Verify that correct YRS/LAS is being used. Verify proper ECU
programming. Perform LAS calibration procedure.

(Note: When checking for voltage at YRS/LAS & SAS, the voltage will only be present momentarily at key ON.).

1. Follow the steps shown in the Yaw Rate Sensor
t r o ub l e sh o ot in g s e c t i o n fo r c a lib r at i o n an d
troubleshooting of the Lateral Acceleration Sensors
(previous page).

Troubleshooting Diagnostic Trouble Codes (DTCs):
Brake Demand/Load Sensors
1st. Blink
Code
24
2nd.
Blink
Code

1
2
3
4
5

6
7
8
9

Location:
Brake Demand/
Load Sensor
Diagnostic Trouble
Code Description

PS1 Open or
Shorted
PS2 Open or
Shorted
PS3 Open or
Shorted
PS1/2
Plausibility Error
PS Supply
Voltage Error

PS Not
Calibrated
PS Error

Repair Information

Check wiring between Brake Demand Sensor (primary brake circuit) and
Electronic Control Unit (ECU). Verify operation of pressure sensor.
Check wiring between Brake Demand Sensor (secondary brake circuit) and ECU.
Verify operation of pressure sensor.
Check wiring between Load Sensor and ECU. Verify operation of pressure sensor.
ECU has detected an invalid pressure sensor signal from one of the Brake
Demand Sensors.
Incorrect supply voltage to the sensors. Verify the proper voltage at sensor
connectors. Verify wiring between the ECU and the sensors. Verify the proper
output voltage from the ECU (Specifically, ensure that X4-4 PS_SPL is not
shorted to ground).
Perform static sensor calibration procedure. (NOTE: When replacing an ECU,
this DTC may occur.)
Verify operation of pressure sensor.
Incorrect supply voltage to sensors. Verify the proper voltage at sensor connectors.
Verify wiring between ECU and the sensors. Verify the proper output voltage from ECU.

PS Supply
Voltage Error
PS Not
Configured

Check for presence of pressure sensors. Make sure ESP is enabled.
3. Verify wiring between the Load Sensor and power/
ground.

Looking into wire
harness connector
Brake Demand/Load Sensor Tests
1. Verify continuity between the ECU and the pressure
sensor power and ground.
Power and Ground Input Test Measurement
B = Power Input

X4 - 4 Power

A = Ground Input

X4 - 1 Common

2. Verify wiring between the Load Sensor and the ECU.
Load Sensor
Wire Harness
Terminal

ECU Wire Harness
Terminal

Measurement

X4 - 2 Brake Demand
Sensor (primary brake circuit)

Verify Continuity

Load Sensor
Harness Terminal

Measurement

C to Voltage & Ground

Verify open circuit (no continuity)

4. To perform a calibration procedure of the Brake Demand
Sensor(s), ensure that the air system is fully charged.
Apply ignition power, and wait 30 seconds. Perform
a full application of the service brake and hold for 5
seconds. Release the service brake.
5. To test the Brake Demand Sensor and/or the Load
Sensor, Bendix® ACom® Diagnostic Software V6.7.2.5
or higher is required. Using the program, select the
“Component Test” option, followed by the “ESP Test”
option. The following screen should be displayed.

X4 - 5 Brake Demand Sensor
Verify Continuity
(secondary brake circuit)
X4 - 3 Load Sensor

Verify Continuity

6. Follow the prompts to test the Brake Demand Sensor(s)
and/or the Load Sensor.
43

Troubleshooting Diagnostic Trouble Codes (DTCs):
Valves Miscellaneous
1st. Blink
Code
25

2nd.
Blink
Code

Location:
Valves

Diagnostic Trouble
Code Description

Repair Information

Differential Lock
Solenoid Open

Verify resistance between Diff solenoid and Diff common. Check for corroded
/damaged wriing or connectors between the Electronic Control Unit (ECU)
and the Diff solenoid.

Differential Lock
Solenoid Shorted to
Ground

Verify no continuity between the Diff Lock Solenoid and ground. Check for
corroded/damaged wiring or connectors between the ECU and Diff Lock
Solenoid.

Differential Lock
Solenoid Shorted to
Voltage

Verify no continuity between the Diff Lock Solenoid and voltage. Check for
corroded/damaged wiring or connectors between the ECU and Diff Lock
Solenoid.

I/O 3 Open Circuit

Verify resistance for I/O3 circuit. Check for corroded / damaged wiring or
connector between ECU and I/O.

I/O 3 shorted to
Ground

Check for a short circuit condition between ground and the I/O 3 circuit
Verify resistance between Input /Output and ground is open

I/O 3 Shorted to
Battery

Check for a short circuit condition between voltage and the I/O 3 circuit
Verify resistance between Input /Output and voltage is open

Output Configuration
Error - Diff

Mismatch between ECU configuration and Diff valve

Output Configuration
Error - I/O 3

Mismatch between ECU configuration and I/O3

Troubleshooting Diagnostic Trouble Codes (DTCs):
Bendix® ESP® system-related
1st. Blink
Location:
Code 2nd. J1939 Bendix® ESP®
Diagnostic Trouble Code
26 Blink system-related
Description
Code

Repair Information

J1939 CAN Time‑out of ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted on J1939 link.
Verify the Electronic Control Unit (ECU) configuration

Time‑out or Invalid CAN data
–CCVS 2 ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted on J1939 link.
Verify the ECU configuration

Time‑out or Invalid CAN data
–Electronic Engine Controller 1
ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of engine ECU on J1939 link.
Verify message is being transmitted on J1939 link. Verify data for driver's
demand torque, actual engine torque, engine speed is correct. Verify the
ECU configuration

Time‑out or Invalid CAN data
–EEC2 ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of engine ECU on J1939 link.
Verify message is being transmitted on J1939 link. Verify acceleration
pedal position and acceleration pedal status is correct. Verify the ECU
configuration

Time‑out or Invalid CAN data
– Driveline Line Retarder ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of a retarder on J1939 Link.
Verify that the message is being transmitted. Verify that the data is correct
for torque / speed control. Verify the ECU configuration

Time‑out or Invalid CAN data –
Engine Retarder ESP Message

Time‑out or Invalid CAN
data – Exhaust Retarder ESP
Message

Time‑out or Invalid CAN data –
PROP XBR ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of Radar on J1939 link. Verify
message is being transmitted. Verify the ECU configuration

Time‑out or Invalid CAN data
– Transmission Retarder ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of a retarder on J1939 Link. Verify
that the message is being transmitted. Verify that the data in torque/speed
control. Verify the ECU configuration

Time‑out or Invalid CAN data
–Electronic Transmission
Controller 1 ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of transmission ECU on J1939
link. Verify that the message is being transmitted. Verify that the data for
shift in process, torque configuration lock , driveline engaged is correct.
Verify the ECU configuration

Time‑out or Invalid AUXI/O –
ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify that the message is being transmitted. Verify
that the data for reference torque is correct. Verify the ECU configuration

Troubleshooting Diagnostic Trouble Codes (DTCs):
J1939 Bendix® ESP® system-related (continued)
1st. Blink
Code
26

Location:
J1939 Bendix® ESP®
system-related

2nd.
Blink
Code

Diagnostic Trouble Code
Description

Repair Information

Time‑out or invalid data for
Configuration of Electronic
Engine Controller 1 ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of engine on J1939 link. Verify
that the message is being transmitted. Verify that the data for reference
torque is correct. Verify the Electronic Control Unit (ECU) configuration

Invalid Data Transfer Time‑out
of EC1 ESP Message

Time‑out or invalid data for
Configuration of Driveline Line
Retarder ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of a retarder on J1939 link. Verify
that the message is being transmitted. Verify that the data for reference
torque is correct. Verify the ECU configuration

Time‑out or invalid CAN data
–Electronic Engine Controller
ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Verify the presence of engine ECU on J1939 link. Verify the
presence of engine ECU on J1939 link. Verify the ECU configuration

Time‑out or invalid CAN data
–Electrionic Transmission
Controller 2- message required
for ESP

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of transmission ECU on J1939
link. Verify that the message is being transmitted. Verify that the data for
current gear is correct. Verify the ECU configuration

Time‑out or invalid data
for Configuration of Engine
Retarder ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of a retarder on J1939 link. Verify
message is being transmitted. Verify the ECU configuration

Time‑out or invalid data for
Configuration of Exhaust
Retarder ESP Message

Time‑out or invalid data for
Configuration of Transmission
Retarder ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of Radar on J1939 link. Verify
the ECU configuration

Invalid Data Transfer Time‑out
of Driveline Line Retarder ESP
Message

Invalid Data Transfer Time‑out
of Engine Retarder ESP
Message

Invalid Data Transfer Time‑out
of Exhaust Retarder ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify the presence of a retarder on J1939 link. Verify
the presence of a retarder on J1939 link. Verify message is being transmitted.
Verify the ECU configuration

Troubleshooting Diagnostic Trouble Codes (DTCs):
J1939 Bendix® ESP® system-related (continued)
1st. Blink
Code
26
2nd.
Blink
Code

Location:
J1939 ESP-related

Diagnostic Trouble Code
Description

Repair Information

Time‑out or invalid CAN data –
CCVS ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted on J1939 link.
Verify data for park brake, brake lamp switch, clutch and tachograph. Verify
the Electronic Control Unit (ECU) configuration

Time‑out or invalid CAN data –
TCO ESP Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted. Verify the ECU
configuration

Invalid Data Transfer Time‑out
of Driveline Line Retarder
ESP Message

ESP-related CM3 Time‑out
at J1939

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted. Verify the ECU
configuration

Time‑out of message or invalid
data received from transmission
transfer information on J1939 message required for ESP

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted. Verify the ECU
configuration

Time‑out or invalid CAN data –
Electronic Axle Controller 1ESP
Message

Check for damaged or reversed J1939 wiring. Check for damaged or
corroded connectors. Verify message is being transmitted. Verify the ECU
configuration

Troubleshooting: Connectors
Bendix® ESP® EC‑80™ Controller Wire Harness Connector Part Numbers and Pin Assignments:

CONNECTOR

Bendix ESP EC‑80 Controller
Controllers utilize four (4) AMP connectors for wire harness connections.

X1 Connector Pin Assignments
Vary by Part Number:
K105303R000

K098920R000
K098921R000
K103428R000
K103429R000
K105094R000
K105095R000
K105096R000
K105097R000
Pin

X2 Connector
Pin
Assignments

Designation

1
2

Ground
Trailer ABS Indicator

Ignition

X4 Connector Pin
Assignments

Designation

PMV SA Left HLD

ABS ORS

Pressure Sensor CMN

PMV SA Left REL

Diff. Lock Solenoid*

Brake Demand Primary
Circuit Signal

PMV SA Left CMN

TCV CMN (SA)

Load Sensor Signal

TCV CMN (DA)

TCV (DA)

PMV SA Right HLD

PMV AA Left HLD

Pressure Sensor
Supply

TCV (DA)

TCV CMN (DA)

WSS SA Left (+)

TCV (SA)

Brake Demand
Secondary Circuit
Signal

ATC/ESP Indicator
and ATC ORS

TPMS Ground

PMV SA Right CMN

PMV AA Left CMN

PMV Trailer HLD

J1939 High

PMV SA Right REL

PMV AA Left REL

Sensor CAN Low

J1939 Low

WSS SA Left (-)

Stop Lamp Output

Sensor CAN High

PMV DA Right CMN

PMV AA Right CMN

PMV Trailer REL

WSS DA Right (+)

PMV DA Right HLD

PMV AA Right HLD

Sensor CAN Common

WSS DA Right (-)

WSS SA Right (+)

WSS AA Left (+)

Sensor CAN Supply

PMV DA Left CMN

WSS AA Right (+)

PMV Trailer CMN

J1939 High 2

PMV DA Right REL

PMV AA Right REL

J1939 Low 2

WSS SA Right (-)

WSS AA Left (-)

ABS Indicator Interlock

WSS DA Left (+)

WSS AA Right (-)

TPMS
Communications

SLS Input

10
11
12

ABS Indicator
Ground

Reserved

HSA Disable Switch

X3 Connector
Pin
Assignments

Battery

PMV DA Left HLD

Retarder

ATC/ESP Indicator

PMV DA Left REL

ABS Dash Indicator

ATC Disable Switch or
WSS DA Left (-)
Diagnostic Switch

*AWD vehicles only (AWD Transfer Case.)

Troubleshooting: Wiring
ABS/ATC WIRING
Electronic Control Unit (ECU) Wiring Harness
Connectors
®

™

The Bendix ESP EC‑80 Controller is designed to
interface with AMP MCP 2.8 connectors as referenced in
Figure 21. Follow all AMP requirements for the repair of
wire harnesses.
All wire harness connectors must be properly seated. The
use of secondary locks is strongly advised.

All wires must be carefully routed to avoid contact
with rotating elements. Wiring must be properly
secured approximately every 6 to 12 inches using UV
stabilized, non-metallic hose clamps or bow-tie cable
ties to prevent pinching, binding or fraying.
It is recommended that wires be routed straight out of a
connector for a minimum of three inches before the wire
is allowed to bend.
Battery and ground wires should be kept to a minimum
length.

All unused ECU connectors must be covered and
receive proper environmental protection.

If convoluted tubing is used, its I.D. must match the size
of the wire bundle as closely as possible.

ABS Wiring Requirements
As a matter of good practice and to ensure maximum
system robustness, always use the maximum size wire
supported by the wire harness connectors for battery,
ignition, ground, Pressure Modulator Valve (PMV), Traction
Control Valve (TCV), Interaxle Differential Lock and
indicator lamp circuits.
All sensor and serial communications circuits (J1939) must
use twisted pair wiring (one to two twists per inch). See
the appropriate Society of Automotive Engineers (SAE)
document for additional details.

Wire harness lengths must be carefully selected for
the vehicle. Excess lengths of wire are not to be
wound to form coils, instead re-route, repair or replace
wire harness to avoid the possibility of electrical
interference and wire damage. Do not attempt to
stretch harnesses that are too short, since mechanical
strain can result in wire breakage.

Bendix® SAS-60™ Sensors and YAS-60™, or
YAS‑70X™, Sensor Wiring
If it is necessary to replace the wiring that connects the
Bendix SAS-60 or the Yaw Rate sensor to the ECU, it
is important to use the same wiring as that used by the
vehicle OEM.

ABS Component
In-Cab Controller Harness
17-Way AMP
MCP 2.8 (X1)
In-Cab Controller Harness
18-Way AMP
MCP 2.8 (X2)
In-Cab Controller Harness
15-Way AMP
MCP 2.8 (X3)

Connector

Wire Terminal

1718091-1

927768-9
1 - 2.5 mm2
X1-12 & 18

Terminal
Lock

Terminal Crimp Tool

N/A
967634

8-968974-1
968874
2.5 - 4 mm2

N/A

8-968973-1

Controller Harness
12-Way AMP
MCP 2.8 (X4)

539723-2
8-968972-1

ABS Modulator Harness
AMP Twist-Lock
(Bayonet)

Wire Seal/
Plug

968873
1.0 - 2.5 mm2

1-967325-2
N/A

ATC Modulator Harness
AMP Twist-Lock
(Bayonet)
ABS Modulator Harness
3-pin Packard
Metri-Pack
280 Series

929975-1
1-967325-3

12040977

539635-1

12077411

12015323

12034145

12155975

TE® Connectivity / AMP Terminal Removal Tool. Newark® Part
No. 78H0240. Manufacturer Part Number 1-1579007-6
Bendix® WS-24™ Wheel Speed Sensor Connectors

Packard® GT
150 series

Packard
Metripack 150.2
series

Deutsch®
DTM06 series

Packard
Metripack 280
series (female)

Packard
Metripack 280
series (male)

Yaw Rate Sensor Wire Harness Connectors (4 contact):
Straight Connector: Schlemmer® 9800 351 (shown)
AMP® Connector 2-967325-1
®
®
ITT Cannon Connector 121583-001
90 degree Connector: Schlemmer 9800 331
Brake Demand Sensor/Load Sensor
Wire Harness Connectors:
Metri-Pack® (Packard) 1206 5287
Contact Pins:
Packard 1210 3881

Standard round
two pin

Yaw Rate Sensor Wire Harness
Contact Pin Terminals:

Schlemmer 7814 125

AMP 0-962981-1

ITT Cannon 031-8717-120

Bendix® SAS-60™ Sensor Connectors:
Robert Bosch® 1 928 404 025,
Robert Bosch 1 928 498 001
One Meter Adapter to Connector:
Bendix 5015242 (shown)
Packard 12092162, pins 12064971

FIGURE 21 - BENDIX ESP® EC-80™ CONTROLLER COMPONENT CONNECTORS
50

Deutsch DT04
series

Troubleshooting: Wiring (Continued)

Speed Sensor
Mounting Block

Mounting
Block

Max. Gap
(Sensor to Exciter)
.015 Inches

WS-24™ Speed
Sensor

100 Tooth (typical)
Speed Sensor
Exciter Ring

100 Tooth
Exciter
Ring

Brake Drum

WS-24™ Speed
Sensor

Hub Assembly

90° Speed
Sensors

Sensor
Clamping
Sleeve

Straight Speed
Sensors

Air Disc Brake
Note: Ensure that the sensor wiring is
routed to avoid chafing from moving
parts (including rotors and steering
components.)

FIGURE 22 - BENDIX® WS-24™ WHEEL SPEED SENSOR INSTALLATION (S-CAM AND AIR DISC BRAKE)

Wheel Speed Sensor Wiring
Route sensor wiring coming out of the wheel ends away
from moving brake components. Sensor wiring needs to
be secured to the axle to prevent excess cable length and
wiring damage. It is required that cable ties be installed
to the sensor wire within 3 inches (76.2 mm) of the sensor
head to provide strain relief.

Bendix does not recommend using standard tie-wraps to
secure wiring harnesses directly to rubber air lines. This
may cause premature wiring failure from the pressure
exerted on the wiring when air pressure is applied through
the air line. Non-metallic hose clamps or bow-tie tie-wraps
are preferred.

Following the axle, the sensor wires must be attached
along the length of the service brake hoses using cable ties
with ultraviolet protection and secured every 6 to 8 inches
(152 to 203 mm). Sufficient – but not excessive – cable
length must be provided to permit full suspension travel and
steering axle movement. Install wires so that they cannot
touch rotating elements such as wheels, brake discs or
drive shafts. Radiation protection may be necessary in
the area of brake discs.

The use of grommets or other suitable protection is
required whenever the cable must pass through metallic
frame members.
All sensor wiring must utilize twisted pair wire, with
approximately one to two twists per inch.
It is recommended that wires be routed straight out of a
connector for a minimum of three inches before the wire
is allowed to bend.

TCV_DA_CMN

ESP/ATC IND.

ESP/ATC
DASH
INDICATOR

ATC
OFF-ROAD
SWITCH
(ORS)
20

TRAC
CONTROL
VALVE
(TCV)

J1587 A

J1587 B

J1939_HI

BATTERY

30A

GROUND

(OPTIONAL)
RETARDER RELAY

IND. INTERLOCK

ABS IND.

SLS INPUT

+12V BATTERY

TRAILER ABS
DASH INDICATOR

18 15 12

ABS IND. GND

VEHICLE 6 X 4

+12V IGNITION

IGNITION
3

WSS_DR+

ABS DASH
INDICATOR

STOP LAMP SWITCH

ADDITIONAL
AA

(SLS)

DRIVE
DA

PMV_DR_REL

2 1

PMV_DR_CMN

DRIVE
AXLE
RIGHT
PMV

DRIVE AXLE

WSS
DRIVE
AXLE
LEFT

15 18

WSS
DRIVE
AXLE
RIGHT

10 11

WSS_DR-

RETARDER

WSS_DL+

STEER

WSS_DL-

J1939_LO

PMV_DR_HLD

13 14

TRAILER ABS IND.

TCV_DA

PMV_DL_CMN

PMV_DL_HLD
DRIVE
AXLE
LEFT
PMV

PMV_DL_REL

2 1

16 12

PMV_SR_REL

2 1

PMV_SR_CMN

STOP LAMP

STEER
AXLE
RIGHT
PMV

PMV_SR_HLD
4

2 1

STEER
AXLE
LEFT
PMV

PMV_SL_CMN
3

PMV_SL_REL
5

WSS_SR+

DIFF
LOCK
SOL

WSS
ADD
AXLE
LEFT

PMV_AR_HLD

2 1

PMV_AR_CMN

ADD
AXLE
RIGHT
PMV

PMV_AR_REL
5

STOP LAMP SWITCH INPUT REQUIRED FOR ATC AND ALL-WHEEL DRIVE VEHICLES.
MAY BE PROVIDED VIA HARDWARE INPUT OR J1939 COMMUNICATION.
CAN SENSOR WIRING - 18 AWG (FOUR CONDUCTOR TWISTED WIRE REQUIRED).
MOMENTARY SWITCH.

18
19
20

ADDITIONAL AXLE WSS AND PMV INSTALLED PER EC-80 CONFIGURATION (6S/4M, 6S/6M).

THIS SYSTEM WIRING CONNECTION SCHEMATIC IS FOR AN EC-80 ECU DESIGNED AS A SERVICE REPLACEMENT FOR EC-60 ADVANCED.

STEER
AXLE

WHEN X1 IS DISCONNECTED FROM ECU, THE INTERLOCK SHORTS THE INDICATOR CIRCUIT TO GROUND, ILLUMINATING THE
ABS INDICATOR.

TCV_SA_CMN

TRACTION
CONTROL
VALVE

PRODUCT SPECIFICATION: Y119679

15.

8-968972-1

TCV_SA

16.

ALL WHEEL DRIVE VEHICLES ONLY. REQUIRES STOP LAMP INPUT (SEE NOTE 18 ).

12 POLE

ALL WIRE IS CONDUCTOR CROSS-SECTION OF 16 AWG, UNLESS OTHERWISE NOTED.

15 POLE

8-968974-1
18 POLE

8-968973-1

1718091-1
17 POLE

ADD
AXLE
LEFT
PMV

2 1

PMV_AL_CMN

AMP
CONNECTOR
PART NUMBER

PMV_AL_HLD
4

PMV_AL_REL

NUMBER OF
CONTACTS

WIRE HARNESS CONNECTORS

ADDITIONAL AXLE

WSS
ADD
AXLE
RIGHT

WSS_AL-

11 14

WSS_AL+

14.

DOTTED LINES: SPECIAL FUNCTION (OPTIONS).
BATTERY AND GROUND - 12 AWG

SERIAL COMMUNICATIONS - 18 AWG (TWISTED PAIR REQUIRED).

TRACTION CONTROL VALVE (TCV).

WHEEL SPEED SENSOR (WSS): BENDIX WS-24
WSS WIRING - 18 AWG (TWISTED PAIR REQUIRED).

7
8
9

PRESSURE MODULATOR VALVE (PMV): BENDIX M-32, M-32QR, M-40X
PMV CONNECTOR TWIST-LOCK PACKARD
COMMON (CMN)
PIN 2
PIN B
HOLD (HLD)
PIN 3
PIN C
RELEASE (REL)
PIN 1
PIN A

WSS_AR+
12 15

WSS_AR-

REF. NO.

ATC ENGINE CONTROL PER SAE J1939.

ABS
OFF-ROAD
SWITCH
(ORS)
20

DIAGNOSTIC BLINK CODE SWITCH (MOMENTARY SWITCH).

DIAGNOSTICS PER SAE J1587 OR J1939.

STOP LAMP
RELAY

WSS
STEER
AXLE
LEFT

WSS_SL8

ABS ORS

RETARDER CONTROL VIA RELAY OR SAE J1939.

WSS
STEER
AXLE
RIGHT

WSS_SL+
5

DIFF

WSS_SR-

11 14

STOP LAMP OUTPUT

NOTES

STEER AXLE

PMV_SL_HLD
1

CAN_SEN_SPL

CAN_SEN_CMN

8 10 11

CAN_SEN_HI

STEERING
ANGLE
SENSOR

CAN_SEN_LO
7

PS_SIG 2
PRESSURE
SENSOR 2
(SECONDARY
DELIVERY)

PS_CMN
4

PS_SPL
3

PS_SIG 3

YAW
RATE
SENSOR

PRESSURE
SENSOR 3
(SUSPENSION)

PS_SIG 1
PRESSURE
SENSOR 1
(PRIMARY
DELIVERY)

PMV_TR_REL

2 1

PMV_TR_CMN

PMV
TRAILER

PMV_TR_HLD
6

Troubleshooting: Wiring Schematic A
Use this page for the following
Electronic Control Unit (ECU) part
numbers:
K098920R000
K098921R000
K103428R000
K103429R000
K105094R000
K105095R000
K105096R000
K105097R000
See next page for the alternate wiring
schematic for one other part number.

FIGURE 23 - STANDARD WIRING SCHEMATIC FOR ECUs LISTED ABOVE

TCV_DA_CMN

TRAC
CONTROL
VALVE
(TCV)

TPMS GND

TCV_DA

CAN LO 2

CAN HI 2

30A

ATC IND

GROUND

TPMS COMM

IND. INTERLOCK

NOT CONNECTED

IGNITION

HSA
LAMP

VEHICLE 6 X 4

+12V BATTERY

HSA
DISABLE
SWITCH

ATC
3
MUD
& SNOW

ATC DISABLE
OR
DIAGNOSTIC
SWITCH

18 15 12

HSA DISABLE

+12V IGNITION

ATC
LAMP

ATC DIS OR DIAG SW

WSS_DR+
WSS
DRIVE
AXLE
RIGHT

10 11

WSS_DR7

DRIVE
DA

PMV_DR_REL

2 1

PMV_DR_CMN

DRIVE
AXLE
RIGHT
PMV

DRIVE AXLE

WSS
DRIVE
AXLE
LEFT

15 18

ADDITIONAL
AA

STEER

BATTERY

WSS_DL+

J1939_HI

WSS_DL-

J1939_LO

PMV_DR_HLD

13 14

PMV_DL_CMN

PMV_DL_HLD

PMV_DL_REL

2 1

PMV_SR_REL

2 1

PMV_SR_CMN
STEER
AXLE
RIGHT
PMV

PMV_SR_HLD
4

2 1

STEER
AXLE
LEFT
PMV

PMV_SL_CMN
3

PMV_SL_REL
5

STEER AXLE

PMV_SL_HLD
1

WSS_SR-

WSS_SR+
WSS
STEER
AXLE
RIGHT

11 14

TPMS PWR
16

I/0
8

HSA
SOL

HSA SOLENOID

PACKARD
PIN B
PIN C
PIN A

WSS
ADD
AXLE
LEFT

8-968973-1
15 POLE
12 POLE

X3
X4

8-968972-1

8-968974-1
18 POLE

1718091-1
17 POLE

NUMBER OF
CONTACTS

2 1

ADD
AXLE
LEFT
PMV

22. NO ABS OFF ROAD SWITCH. ABS OFF ROAD ACTIVATED WITH ATC MUD AND SNOW.

21. ABS/ESP/TRAILER LAMP VIA J1939.

20 ADDITIONAL AXLE WSS AND PMV INSTALLED PER EC-80 CONFIGURATION (6S/4M, 6S/6M).

18 STOP LAMP SWITCH INPUT REQUIRED FOR ATC AND ALL-WHEEL DRIVE VEHICLES.
IS PROVIDED VIA STOP LAMP SWITCH VIA J1939 COMMUNICATION.
19 CAN SENSOR WIRING - 18 AWG (FOUR CONDUCTOR TWISTED WIRE REQUIRED).

PMV_AL_REL

AMP
CONNECTOR
PART NUMBER

PMV_AL_HLD
4

PMV_AL_CMN

17. WHEN X1 IS DISCONNECTED FROM ECU, BODY CONTROLLER NEEDS TO ILLUMINATE ABS INDICATOR.

16 TPMS WIRING - 3 WIRES.

2 1

ADD
AXLE
RIGHT
PMV

PMV_AR_CMN

WIRE HARNESS CONNECTORS

14. ALL WIRE IS CONDUCTOR CROSS-SECTION OF 16 AWG, UNLESS OTHERWISE NOTED.
15. PRODUCT SPECIFICATION: Y119679 AND Y173755.

PMV_AR_HLD
10

PMV_AR_REL

ADDITIONAL AXLE

WSS
ADD
AXLE
RIGHT

WSS_AL+
11 14

WSS_AL-

13. ALL WHEEL DRIVE VEHICLES ONLY. REQUIRES STOP LAMP INPUT (SEE NOTE 18 ).

12 BATTERY AND GROUND - 12 AWG.

11 DOTTED LINES: SPECIAL FUNCTION (OPTIONS).

10 SERIAL COMMUNICATIONS - 18 AWG (TWISTED PAIR REQUIRED).

9 TRACTION CONTROL VALVE (TCV).

8 WSS WIRING - 18 AWG (TWISTED PAIR REQUIRED).

7 WHEEL SPEED SENSOR (WSS): BENDIX WS-24.

6 PMV CONNECTOR TWIST-LOCK
COMMON (CMN)
PIN 2
HOLD (HLD)
PIN 3
RELEASE (REL)
PIN 1

WSS_AR+
12 15

WSS_AR-

REF. NO.

5 PRESSURE MODULATOR VALVE (PMV): BENDIX M-32, M-32QR, M-40X.

4 ATC ENGINE CONTROL PER SAE J1939.

3 MOMENTARY SWITCH.

2 DIAGNOSTICS VIA SAE J1939.

WSS_SL-

WSS
STEER
AXLE
LEFT

WSS_SL+

1. RETARDER CONTROL VIA SAE J1939.

NOTES:

DRIVE
AXLE
LEFT
PMV

16 12

TCV_SA
3

TCV_SA_CMN

STEER
AXLE

TRACTION
CONTROL
VALVE

CAN_SEN_LO
7

CAN_SEN_SPL

CAN_SEN_HI

CAN_SEN_CMN

8 10 11

1
2

PS_SIG 3
3

YAW
RATE
SENSOR

PRESSURE
SENSOR 1
(PRIMARY
DELIVERY)

PS_SIG 1

PRESSURE
SENSOR 3
(SUSPENSION)

PS_CMN

PS_SIG 2
PRESSURE
SENSOR 2
(SECONDARY
DELIVERY)

PS_SPL

PMV_TR_CMN
12

2 1

PMV_TR_REL

PMV
TRAILER

PMV_TR_HLD
6

Troubleshooting: Wiring Schematic B (Alternate)
Use the wiring schematic on this
page for the following Electronic
Control Unit (ECU) part number:
K105303R000

See the previous page for a
second list of ECU part numbers.

If your ECU part number does
not appear on either list, please
call 1-800-AIR-BRAKE, option 2,
and speak with the Tech Team.

FIGURE 24 - CAB WIRING SCHEMATIC FOR ECU LISTED ABOVE
53

GLOSSARY
ABS — Antilock Brake System.
ABS Event — Impending wheel lock situation that causes the
ABS Controller to activate the modulator valve(s).
ABS Indicator Lamp — An amber lamp which indicates the
operating status of an antilock system. When the indicator lamp
is on, ABS is disabled and the vehicle reverts to normal brake
operation.

IR — Independent Regulation. A control method in which a
wheel is controlled at optimum slip, a point where retardation
and stability are maximized. The brake pressure that is best
for the wheel in question is directed individually into each brake
chamber.
J1939 — A high speed data link used for communications
between the ABS ECU engine, transmission and retarders.

Air Gap — Distance between the Sensor and tone ring.

LAS — Lateral Acceleration Sensor.

ASR — Automatic Slip Regulation. Another name for traction
control.

MIR — Modified Independent Regulation. A method of controlling
the opposite sides of a steer axle during ABS operation so that
torque steer and stopping distance are minimized.

ATC — Automatic Traction Control. An additional ABS function
in which engine torque is controlled and brakes are applied
differentially to enhance vehicle traction.
ATC/ESP Lamp — A lamp that indicates when stability functions,
including traction control, roll stability program or yaw control
are operating.
Channel — A controlled wheel site.
CAN — Controller Area Network. J1939 is an SAE version of
the CAN link.
Clear Codes — System to erase historical Diagnostic Trouble
Codes (DTCs) from the ECU, from either the Diagnostic Switch
or from a hand-held diagnostic tool (only repaired DTCs may
be cleared).
Configuration — The primary objective is to identify a “normal”
set of sensors and modulators for the Electronic Control Unit,
so that it will identify future missing sensors and modulators.
Diagnostic Connector — Diagnostic receptacle in vehicle cab
for connection of J1939 hand-held or PC based test equipment.
The tester can initiate test sequences, and can also read system
parameters.
Diagnostic Switch — A switch used to activate blinks codes.
Differential Braking — Application of brake force to a spinning
wheel so that torque can be applied to wheels which are not
slipping.

PLC — Power Line Carrier. The serial communication protocol
used to communicate with the trailer over the blue full time
power wire.
PMV — Pressure Modulator Valve. An air valve which is used
to vent or block air to the brake chambers to limit or reduce
brake torque.
QR — Quick Release. Quick release valves allow faster release
of air from the brake chamber after a brake application. To
balance the system, quick release valves have hold off springs
that produce higher crack pressures (when the valves open).
Relay Valve — Increases the application speed of the service
brake. Installed near brakes with larger air chambers (type 24
or 30). The treadle valve activates the relay valve with an air
signal. The relay valve then connects its supply port to its delivery
ports. Equal length air hose must connect the delivery ports of
the relay valve to the brake chambers.
Retarder Relay — A relay which is used to disable a retarder
when ABS is triggered.
RSP — Roll Stability Program. An all-axle ABS solution that
helps reduce vehicle speed by applying all vehicle brakes as
needed, reducing the tendency to roll over.
SAS — Steering Angle Sensor.

ECU — Electronic Control Unit.

Sensor Clamping Sleeve — A beryllium copper sleeve which
has fingers cut into it. It is pressed between an ABS sensor and
mounting hole to hold the sensor in place.

ESP — Electronic Stability Program. Full stability function that
includes RSP & YC subfunctions.

Stored Diagnostic Trouble Codes — A DTC that occurred in
the past.

Diagnostic Trouble Code — A condition that interferes with the
generation or transmission of response or control signals in the
vehicle's ABS system that could lead to the functionality of the
ABS system becoming inoperable in whole or in part.

TCS — Traction Control System, another name for ATC or ASR.

FMVSS-121 — Federal Motor Vehicle Safety Standard which
regulates air brake systems.
Hill Start (or “Hill Start Assist”) HS/HSA — This feature
interfaces between the transmission and braking system to help
the driver prevent the vehicle from rolling downhill when moving
up a steep incline from a stationary position.

TCV — Traction Control Valve.
Tone Ring — A ring that is usually pressed into a wheel hub that
has a series of teeth (usually 100) and provides actuation for the
speed sensor. Note maximum run out is .008.
YC — Yaw Control. Helps stabilize rotational dynamics of vehicle.
YRS — Yaw Rate Sensor.

APPENDIX A: TROUBLESHOOTING A 12-7 BLINK CODE, EQUIVALENT TO A
(SID-93 FMI-4) (SPN‑0802 FMI-04) DIAGNOSTIC TROUBLE CODE (DTC)

Bendix® EC‑80™ ESP® Electronic Control Unit (ECU)
1) Remove the X1, X2, X3 and X4 connectors from the ECU.
2) Using X1-1 as the ground connection, check for resistance
for the entire X2 connector. There should be no resistance
to ground found. Please fill out worksheet on this page.

Record Resistances
Below:
X1-1 for ground point

3) Using X1-1 as the ground connection, check for resistance
for X1-4 and X1-5. There should be no resistance to ground.

X1 Pin Resistance

4) Using X1-1 as the ground connection, check for resistance for
X3-4, X3-6, X3-7, X3-9, X3-10, X3-13, X3-3 and X3-5. There
should be no resistance to ground. (Even if the vehicle is not
configured for 6S/6M).

X1-5

5) Using X1-1 as the ground connection, check for resistance
for X4-6, X4-9 and X4-12. There should be no resistance to
ground.

X2-1

6) Troubleshoot any pin that has resistance to ground. If no
issues are found continue to step 7.

X2-4

7) Reconnect the X1 connector only and apply IGN power to the
ECU and using the DTC screen of Bendix® ACom® Diagnostic
Software, clear all DTCs. Re-check for any DTCs. If the
12-7 DTC is still present, the problem is the Traction Solenoid
Wiring or Solenoid.
8) If the 12-7 DTC does not reappear, remove power and connect
the X2 connector, reapply power, then clear all DTCs. If the
12-7 DTC is no longer present, connect the X3 connector
and clear all DTCs.

X1-4

X2 Pin Resistance
X2-2
X2-3
X2-5
X2-6
X2-7
X2-8
X2-9
X2-10
X2-11
X2-12

9) If at this point the 12-7 DTC is not present, the problem is
with the X4 connector.

X2-13

For Peterbilt® & Kenworth® Trucks Only:

X2-15

10)

Clear all DTCs. If the 12-7 DTC reappears, the issue is
on the X4 connector. Otherwise, proceed to the next step.

11)

Disconnect all modulators and the traction solenoid.
Clear all DTCs. If the DTC does not reappear, connect
one modulator and Traction Solenoid at a time, until the
DTC reappears. Otherwise, continue to the next step.

12)

Make sure all modulators and the traction solenoid are
connected. Disconnect the ABS bulkhead connector at
the engine (top-left side) and remove Pins 1, 2, 11 &12.
Reconnect the connector and apply IGN power to the
ECU. Using Bendix ACom Diagnostics, clear all DTCs.
If the 12-7 DTC returns, the problem is either the wiring
harness inside the cab or the ECU.

X2-14
X2-16
X2-17
X2-18
X3 Pin Resistance
X3-4
X3-5
X3-6
X3-7
X3-8

X3-9
X3-10
X3-13
X4 Pin Resistance
X4-6
X4-9
X4-12

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
SPN
(J1939)

FMI
(J1939)

Bendix® Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)

Lamp Status
ABS

ATC/
ESP

No DTCs

168
168

3
4

6
6

2
1

Power Supply DTCs
Battery Voltage Too High
Battery Voltage Too Low
Miscellaneous DTCs

ON
ON

564

Differential Lock Solenoid Shorted To Voltage

564
564
564

4
5
13

25
25
25

2
1
7

ON
ON
ON

575

576

614

614
614
614
614
615
615

3
4
5
13
14
14

25
25
25
25
12
12

6
5
4
8
19
20

ON
ON
ON
ON
-

614

614
614
614
614
615
615

3
4
5
13
14
14

25
25
25
25
12
12

6
5
4
8
19
20

ON
ON
ON
ON
-

629
629
629
629

2
2
2
2

13
13
13
13

4
5
7
17

ON
ON
ON
ON

629

629
629
629
629

12
12
12
12

13
13
13
13

3
14
15
16

ON
ON
ON
ON

629
629

14
14

12
12

28
30

Differential Lock Solenoid Shorted To Ground
Differential Lock Solenoid Open
Output Configuration Error - Differential
ABS Disabled Due To Special Mode Or Off-Road ABS Active.
Note: The ABS warning lamp will be flashing indicating the is in ABS offroad mode
ATC or ESP Disabled or Dynamometer Test Mode Active
I/O 2 or 3 Shorted High (EC‑80 ATC) OR
I/O 2 or 3 Shorted High or Stop Lamp Output Error (ESP EC‑80)
I/O 3 Shorted to Voltage
I/O 3 Shorted to Ground
I/O 3 Open Circuit
Output Configuration Error - I/O 3
Maximum Number of Pressure Modulator Valve (PMV) Cycles Exceeded
Maximum Number of Traction Control Valve (TCV) Cycles Exceeded
I/O 2 or 3 Shorted High (EC‑80 ATC) OR
I/O 2 or 3 Shorted High or Stop Lamp Output Error (ESP EC‑80)
I/O 3 Shorted to Voltage
I/O 3 Shorted to Ground
I/O 3 Open Circuit
Output Configuration Error - I/O 3
Maximum Number of PMV Cycles Exceeded
Maximum Number of TCV Cycles Exceeded
ECU DTCs (Also see other 629 codes)
ECU DTC (2678C)
ECU DTC (1C)
Configuration Mismatch
ECU DTC (C8C)
Miscellaneous DTCs
Air System / Mechanical Component
ECU DTCs (Also see other 629 codes)
ECU DTC (10)
ECU DTC (C6)
ECU DTC (CF)
ECU DTC (C0)
Miscellaneous DTCs
Air System / Mechanical Component
ESP Disabled Due to Off-Road Mode

ON
-

ON
ON

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
SPN
(J1939)

Bendix® Blink Code
Equivalent(s)
FMI
Diagnostic Trouble Code (DTC) Description
(J1939)
(1st
(2nd
Digit)
Digit)

629
630
630
630
630
630
630
630
630
630
630
630
630
630
630
630

14
12
12
12
12
12
13
13
13
13
13
13
13
13
13
14

13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13

1
6
10
19
20
28
2
8
9
18
21
22
25
26
29
13

639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639
639

2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
26
26

2
3
4
5
6
7
8
10
11
12
14
15
16
20
21
22
23
24
28
1
2

639

639
639
639
639
639
639

2
2
2
2
2
2

26
26
26
26
26
26

4
5
6
7
8
9

639

ECU DTCs (Also see other 629 codes)
ECU DTC (5FC)
ECU DTC(6CD)
ECU DTC (5F3)
ECU DTC (63)
ECU DTC (6E)
ECU DTC (7CD)
ECU DTC (5CD)
ECU DTC (56)
ECU DTC (CA3C)
ECU DTC (CC)
ECU DTC (6C)
ECU DTC (63C)
VIN Mismatch
Valve Configuration Mismatch
ECU DTC (5D)
Configuration Mismatch
J1939 DTCs
J1939 Electronic Retarder Time‑out or Invalid Signal
J1939 Electronic Engine Controller 1 Time‑out or Invalid Signal
J1939 Electronic Engine Controller 2 Time‑out or Invalid Signal
J1939 AIR Message Time‑out or Invalid Signal
ESP J1939 CAN Message Time‑out
Time‑out or Invalid CAN Data for ETC7/VP15
Time‑out or Invalid Data on XBR
J1939 Electronic Transmission Controller 1 Time‑out or Invalid Signal
AUXIO CAN Message Time‑out
J1939 Hill Start Aid Switch Signal Not Available - HSA LAMP ON
J1939 CAN Message Related to ESP is Incomplete
J1939 Electronic Engine Controller 3 Time‑out or Invalid Signal
J1939 Electronic Transmission Controller 2 Time‑out
J1939 EAC1 Time‑out or Invalid Signal
CAN Message CGW_C1 Time‑out or Invalid Signal
CAN Message ASC1_CLCS Time‑out or Invalid Signal
J1939 CCVS Time‑out or Invalid Signal
J1939 TCO(Tachograph) Time‑out
J1939 Proprietary XBR Message Out-of-Range
J1939 CAN Time‑out of ESP Message
Time‑out or Invalid CAN Data – CCVS 2 ESP Message
Time‑out or Invalid CAN Data – Electronic Engine Controller 1 ESP
Message
Time‑out or Invalid CAN Data – EEC2 ESP Message
Time‑out or Invalid CAN Data – Driveline Line Retarder ESP Message
Time‑out or Invalid CAN Data – Engine Retarder ESP Message
Time‑out or Invalid CAN Data – Exhaust Retarder ESP Message
Time‑out or Invalid CAN Data – PROP XBR ESP Message
Time‑out or Invalid CAN Data – Transmission Retarder ESP Message
Time‑out or Invalid CAN Data – Electronic Transmission Controller 1 ESP
Message
Time‑out or Invalid AUX I/O – ESP Message
Time‑out or Invalid Data for Configuration of Electronic Engine Controller 1
ESP Message

Lamp Status
ABS

ATC/
ESP

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON
-

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON
ON
ON
ON
ON

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
Bendix® Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)

SPN
(J1939)

FMI
(J1939)

639

639
639
639
639
639
639
639
639

2
2
2
2
2
2
2
2

26
26
26
26
26
26
26
26

19
20
21
22
23
24
25
26

639

639
639
639

2
5
12

26
11
11

28
29
1

789

Invalid Data Transfer Time‑out of EC1 ESP Message
Time‑out or Invalid Data for Configuration of Driveline Line Retarder ESP
Message
Time‑out or Invalid CAN Data – Electronic Engine Controller ESP Message
Time‑out or Invalid CAN Data – Electronic Transmission Controller 2Message Required for ESP
Time‑out or Invalid Data for Configuration of Engine Retarder ESP Message
Time‑out or Invalid Data for Configuration of Exhaust Retarder ESP
Message
Time‑out or Invalid Data for Configuration of Transmission Retarder ESP Message
Invalid Data Transfer Time‑out of Driveline Line Retarder ESP Message
Invalid Data Transfer Time‑out of Engine Retarder ESP Message
Invalid Data Transfer Time‑out of Exhaust Retarder ESP Message
Time‑out or Invalid CAN Data – CCVS ESP Message
Time‑out or Invalid CAN Data – TCO ESP Message
Invalid Data Transfer Time‑out of Driveline Line Retarder ESP Message
ESP Related CM3 Time‑out at J1939
Time‑out of message or Invalid Data Received from Transmission Transfer
information on J1939 - Message Required for ESP
Time‑out or Invalid CAN Data – Electronic Axle Controller 1ESP Message
J1939 CAN Messages Are Not Being Transmitted / Received
J1939 Serial Link
Wheel Speed Sensor DTCs
Steer Axle Left WSS Excessive Air Gap

Lamp Status

ATC/
ESP
ON

ON
ON
ON
ON
ON
ON
ON
ON

ON
ON

ON
ON
ON

ABS

789

Steer Axle Left WSS Open or Shorted

789
789
789
789
789
790
790
790
790
790
790
790
791
791
791
791
791
791
791

7
8
9
10
13
1
2
7
8
9
10
13
1
2
7
8
9
10
13

2
2
2
2
2
3
3
3
3
3
3
3
4
4
4
4
4
4
4

5
6
2
4
7
1
3
5
6
2
4
7
1
3
5
6
2
4
7

Steer Axle Left WSS Wheel End
Steer Axle Left Erratic Sensor Signal
Steer Axle Left WSS Signal Low at Drive Off
Steer Axle Left WSS Loss of Sensor Signal
Steer Axle Left WSS Tire Size Calibration
Steer Axle Right WSS Excessive Air Gap
Steer Axle Right WSS Open or Shorted
Steer Axle Right WSS Wheel End
Steer Axle Right Erratic Sensor Signal
Steer Axle Right WSS Signal Low at Drive Off
Steer Axle Right WSS Loss of Sensor Signal
Steer Axle Right WSS Tire Size Calibration
Drive Axle Left WSS Excessive Air Gap
Drive Axle Left WSS Open or Shorted
Drive Axle Left WSS Wheel End
Drive Axle Left Erratic Sensor Signal
Drive Axle Left WSS Signal Low at Drive Off
Drive Axle Left WSS Loss of Sensor Signal
Drive Axle Left Tire Size Calibration

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

792

Drive Axle Right WSS Excessive Air Gap

792
792
792
792
792
792
793

2
7
8
9
10
13
1

5
5
5
5
5
5
14

3
5
6
2
4
7
1

Drive Axle Right WSS Open or Shorted
Drive Axle Right WSS Wheel End
Drive Axle Right Erratic Sensor Signal
Drive Axle Right WSS Signal Low at Drive Off
Drive Axle Right WSS Loss of Sensor Signal
Drive Axle Right Tire Size Calibration
Additional Axle Left WSS Excessive Air Gap

ON
ON
ON
ON
ON
ON
ON

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
®

SPN
(J1939)

FMI
(J1939)

793
793
793
793
793
793
794
794
794
794
794
794
794

2
7
8
9
10
13
1
2
7
8
9
10
13

Bendix Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)
14
14
14
14
14
14
15
15
15
15
15
15
15

3
5
6
2
4
7
1
3
5
6
2
4
14

Additional Axle Left WSS Open or Shorted
Additional Axle Left WSS Wheel End
Additional Axle Left Erratic Sensor Signal
Additional Axle Left WSS Signal Low at Drive Off
Additional Axle Left WSS Loss of Sensor Signal
Additional Axle Left Tire Size Calibration
Additional Axle Right WSS Excessive Air Gap
Additional Axle Right WSS Open or Shorted
Additional Axle Right WSS Wheel End
Additional Axle Right Erratic Sensor Signal
Additional Axle Right WSS Signal Low at Drive Off
Additional Axle Right WSS Loss of Sensor Signal
Additional Axle Right Tire Size Calibration

Lamp Status
ABS
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ATC/
ESP
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

Pressure Modulator Valve (PMV) DTCs
795

Steer Axle Left PMV Common Open Circuit

795
796
796
797
797
798
798
799
799
800
800

13
5
13
5
13
5
13
5
13
5
13

7
8
8
9
9
10
10
16
16
17
17

8
7
8
7
8
7
8
7
8
7
8

Steer Axle Left PMV Configuration Error
Steer Axle Right PMV Common Open
Steer Axle Right PMV Configuration Error
Drive Axle Left PMV Common Open Circuit
Drive Axle Left PMV Configuration Error
Drive Axle Right PMV Common Open Circuit
Drive Axle Right PMV Configuration Error
AA Left PMV Common Open Circuit
AA Left PMV Configuration Error
Additional Axle Right PMV Common Open Circuit
AA Right PMV Configuration Error

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON

ON
ON
-

ON
-

ON
ON
ON
ON

ON
ON
ON
ON
ON
ON
ON
ON

ON
ON

ON
-

Miscellaneous DTCs
801
801

2
3

12
12

4
5

802
802

3
4

12
12

8
7

802
802
805

12
12
14

13
13
12

11
12
9

806
806
806
806
807
807
807
807

3
4
5
13
3
4
5
13

18
18
18
18
19
19
19
19

2
1
3
4
2
1
3
4

810
811

7
2

12
12

11
6

811

815

Retarder Relay Open Circuit or Shorted to Ground
Retarder Relay Open Circuit or Shorted to Voltage
Pressure Modulator Valve (PMV) DTCs
PMV Common Shorted to Voltage
PMV Commons Shorted to Ground
Miscellaneous DTCs
ECU DTC (F1A)
ECU DTC (F14)
ATC Disabled to Prevent Brake Fade
Traction Control Valve (TCV) DTCs
TCV DA Solenoid Shorted to Voltage
TCV DA Solenoid Shorted to Ground
TCV DA Solenoid Open Circuit
TCV DA Valve Configuration Error
TCV SA Solenoid Shorted to Voltage
TCV SA Solenoid Shorted to Ground
TCV SA Solenoid Open Circuit
TCV SA Valve Configuration Error
Miscellaneous DTCs
Wheel Speed Sensors Reversed on an Axle
ABS Dash Indicator Circuit DTC
Warning Lamp Ground Pin Connected to GND in Conflict with Configuration
Settings
Additional Axle WSS Configuration Error

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
®

Bendix Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)

SPN
(J1939)

FMI
(J1939)

932
932
932
933
933
933
934
934
934
935
935
935
936
936
936
936
937
937
937
937
938
938
938
939
939
939
940
940
940
941
941
941
942
942
942
942
943
943
943
943

3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
13
3
4
5
13
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
13
3
4
5
13

7
7
7
8
8
8
9
9
9
10
10
10
16
16
16
16
17
17
17
17
7
7
7
8
8
8
9
9
9
10
10
10
16
16
16
16
17
17
17
17

5
4
6
5
4
6
5
4
6
5
4
6
5
4
6
11
5
4
6
11
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
10
2
1
3
10

1043
1043
1045
1045
1045

2
2
2
2
7

12
12
12
12
12

14
22
2
27
1

Pressure Modulator Valve (PMV) DTCs
Steer Axle Left PMV Hold Solenoid Shorted to Voltage
Steer Axle Left PMV Hold Solenoid Shorted to Ground
Steer Axle Left PMV Hold Solenoid Open Circuit
Steer Axle Right PMV Hold Solenoid Shorted to Voltage
Steer Axle Right PMV Hold Solenoid Shorted to Ground
Steer Axle Right PMV Hold Solenoid Open Circuit
Drive Axle Left PMV Hold Solenoid Shorted to Voltage
Drive Axle Left PMV Hold Solenoid Shorted to Ground
Drive Axle Left PMV Hold Solenoid Open Circuit
Drive Axle Right PMV Hold Solenoid Shorted to Voltage
Drive Axle Right PMV Hold Solenoid Shorted to Ground
Drive Axle Right PMV Hold Solenoid Open Circuit
AA Left PMV Hold Solenoid Shorted to Voltage
AA Left PMV Hold Solenoid Shorted to Ground
AA Left PMV Hold Solenoid Open Circuit
Output Configuration Error - Left Additional Axle Hold
AA Right PMV Hold Solenoid Shorted to Voltage
AA Right PMV Hold Solenoid Shorted to Ground
AA Right PMV Hold Solenoid Open Circuit
Output Configuration Error - Additional Axle Right Hold
Steer Axle Left PMV Release Solenoid Shorted to Voltage
Steer Axle Left PMV Release Solenoid Shorted to Ground
Steer Axle Left PMV Release Solenoid Open Circuit
Steer Axle Right PMV Release Solenoid Shorted to Voltage
Steer Axle Right PMV Release Solenoid Shorted to Ground
Steer Axle Right PMV Release Solenoid Open
Drive Axle Left PMV Release Solenoid Shorted to Voltage
Drive Axle Left PMV Release Solenoid Shorted to Ground
Drive Axle Left PMV Release Solenoid Open Circuit
Drive Axle Right PMV Release Solenoid Shorted to Voltage
Drive Axle Right PMV Release Solenoid Shorted to Ground
Drive Axle Right PMV Release Solenoid Open Circuit
AA Left PMV Release Solenoid Shorted to Voltage
AA Left PMV Release Solenoid Shorted to Ground
AA Left PMV Release Solenoid Open Circuit
Output Configuration Error - Additional Axle Left Release
AA Right PMV Release Solenoid Shorted to Voltage
AA Right PMV Release Solenoid Shorted to Ground
AA Right PMV Release Solenoid Open Circuit
Output Configuration Error - Additional Axle Right Release
Miscellaneous DTCs
ESP sensor supply too high or too Low
U- Bat too high or too Low for ESP sensor
Stop Light Switch Defective
Brake Lamp Input Mismatch With Brake Lamp Output
Stop Lamp Switch Not Detected

Lamp Status
ABS

ATC/
ESP

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON
-

ON
ON
ON
ON
ON

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
Bendix® Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)

SPN
(J1939)

FMI
(J1939)

1056
1056
1056

3
3
4

20
20
20

2
5
1

Pressure Modulator Valve (PMV) DTCs
Trailer PMV: Release Solenoid Shorted to Voltage
Trailer PMV: hold Solenoid Shorted to Voltage
Trailer PMV: Release Solenoid Shorted to Ground

1056

1059
1067
1067
1067
1067
1067

Lamp Status
ABS

ATC/
ESP

ON
ON
-

ON
ON
ON

Trailer PMV: hold Solenoid Shorted to Ground

Trailer PMV: Release Solenoid Open Circuit

Trailer PMV: hold Solenoid Open Circuit

Trailer PMV: Common Open Circuit

2
2
3
4
6
7

24
24
24
24
24
24

3
1
5
7
8
6

ON
ON
ON
ON
ON
ON

1067

1067
1068

14
2

24
24

9
2

Trailer PMV: Configuration Error
Brake Demand/Load Sensor DTCs
PS3 Open or Shorted
PS1 Open or Shorted
PS Supply Voltage High Error
PS Supply Voltage Low Error
PS Supply Voltage Error
PS Not Calibrated
(PS1/PS2 Plausibility Error) Brake Demand Primary and Secondary Circuit
Pressure Sensor Plausibility Error
Pressure Sensor not configured.
PS2 Open or Shorted

ON
ON

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

Miscellaneous DTCs
1238

1807
1807
1807
1807
1807
1807
1807
1807
1807
1807
1807

2
2
2
2
2
2
9
12
13
13
13

21
21
21
21
21
21
21
21
21
21
21

3
4
5
7
9
10
8
6
1
2
11

1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808
1808

2
2
2
2
2
2
2
2
2
2
2
2
2
9
13
14

22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
23

1
2
3
4
6
7
8
9
10
12
13
14
16
5
17
7

ATC disable by switch
Steering Angle Sensor DTCs
SAS Static Signal
SAS Signal Out of Range
SAS Signal Reversed
SAS Gradient Error
SAS Long Term Calibration Error
SAS Plausibility Check (Ref YAW Rate)
SAS CAN Time‑out
SAS Signal Invalid
SAS Not Calibrated
SAS Calibration in Progress
SAS Detected But Not Configured
Yaw Rate Sensor DTCs
YRS Signal Out of Range
YRS Reversed Signal
YRS Invalid Signal
YRS Gradient Error
YRS Static BITE Error
YRS Dynamic BITE Error
YRS Fast Calibration Error
YRS Static Calibration Error
YRS Normal Calibration Error
YRS Plausibility Check (Ref Yaw Rate)
YRS Plausibility Error (Inside Model Based Limits)
YRS Plausibility Error (Outside Model Based Limits)
YRS Vibration Detected
YRS CAN Time‑out
YRS Detected But Not Configured
Erratic ESP Signal

APPENDIX B: J1939 SPN AND FMI CODES AND THEIR BENDIX BLINK CODE EQUIVALENTS
Bendix® Blink Code
Equivalent(s)
Diagnostic Trouble Code (DTC) Description
(1st
(2nd
Digit)
Digit)

SPN
(J1939)

FMI
(J1939)

1809
1809
1809
1809
1809
1809
1809

2
2
2
2
2
13
13

23
23
23
23
23
22
23

1
3
4
5
6
15
2

2011
2051

31
31

11
11

26
27

2622
2622
2622
2622
2622

2
3
3
4
5

12
12
12
12
12

24
26
31
25
33

2984
2984

3
4

12
12

34
35

Lateral Acceleration Sensor DTCs
LAS Signal of Range
LAS Static Calibration Error
LAS Long Term Calibration Error
LAS Plausibility Error (Inside Model Based Limits)
LAS Plausibility Error (Outside Model Based Limits)
YRS- SAS Signal Cross-Check Incomplete
LAS Calibration in Progress
Miscellaneous
ABS ECU CAN Address Conflict
TPMS ECU CAN Address Conflict - TPMS INDICATOR LAMP ON
HS/HSA Hill Start Feature DTCs
HSA lamp Open Circuit or Shorted to GND
HSA valve: Solenoid Shorted to Voltage
HSA lamp Shorted to Voltage
HSA valve: Solenoid Shorted to Ground
HSA valve: Solenoid Open Circuit
Bendix® eTrac™ DTCs
®
Bendix eTrac™ Solenoid Shorted to Voltage
Bendix eTrac Solenoid Shorted to Ground

Figures Used
Figure 1 - Bendix® ESP® EC-80™ Controller.....................................................................1
Figure 2 - Bendix® WS-24™ Wheel Speed Sensors..........................................................3
Figure 3 - Example Of A Bendix® M-40X™ Modulator......................................................3
Figure 4 - Examples Of Steering Angle Sensors.............................................................3
Figure 5 - Yaw And Brake Demand/Load Sensors...........................................................4
Figure 6 - Additional Valves Necessary For The Hill Start Feature..................................4
Figure 7 - Bendix ESP EC‑80 Controller Features...........................................................5
Figure 8 - Power Line Without PLC Signal.......................................................................5
Figure 9 - Power Line With PLC Signal............................................................................5
Figure 10 - Bendix ESP EC‑80 Controller Indicator Lamp Behavior................................8
Figure 11 - Vehicle Orientation (Typical)..........................................................................9
Figure 12 - RSP Example............................................................................................... 12
Figure 13 - Yaw Control Example................................................................................... 12
Figure 14 - Typical Vehicle Diagnostic Connector Locations (J1939)............................ 21
Figure 15 - Example Of Blink Code Message................................................................ 21
Figure 16 - Diagnostic Modes........................................................................................22
Figure 17 - System Configuration Check........................................................................23
Figure 18 - Bendix® ACom® Diagnostics........................................................................ 24
Figure 19 - The Bendix® Remote Diagnostic Unit.......................................................... 24
Figure 20 - Diagnostic Trouble Codes............................................................................25
Figure 21 - Bendix EC‑80 Controller Component Connectors.......................................50
Figure 22 - WS-24 Wheel Speed Sensor Installation (S-Cam And Air Disc Brake)....... 51
Figures 23 & 24 - Troubleshooting: Wiring Schematics............................................52-53

Lamp Status
ABS

ATC/
ESP

ON
ON
ON
ON
ON
ON
ON

ON
-

ON
ON
ON
-

ON
-

ON
ON

Full Table of Contents
Introduction.............................................................................................................................................. 1
Yaw Control (YC)..................................................................................................................................... 3
Roll Stability Program (RSP)................................................................................................................... 3
Components.........................................................................................................................................3-4
Bendix® eTrac™ Automated Air Suspension Transfer System................................................................. 4
ECU Mounting......................................................................................................................................... 4
Hardware Configurations........................................................................................................................ 4
Bendix® ESP® EC‑80™ Controllers USE Power Line Carrier (PLC)........................................................ 5
Bendix ESP EC‑80 Controller Inputs...................................................................................................... 5
Bendix ESP EC‑80 Controller Outputs................................................................................................ 6-7
Indicator Lamps And Power-Up Sequence..........................................................................................8-9
ABS Operation................................................................................................................................... 9-10
ATC Operation...................................................................................................................................11-12
Bendix® ESP® ABS With Stability Control ........................................................................................12-13
Important Safety Information About The Bendix ESP System......................................................... 13-14
Dynamometer Test Mode...................................................................................................................... 14
Automatic Tire Size Calibration............................................................................................................. 14
System Impact During Active Trouble Codes........................................................................................ 15
ABS Partial Shutdown........................................................................................................................... 15
System Reconfiguration........................................................................................................................ 16
Electronic Control Unit (ECU) Reconfiguration..................................................................................... 16
Data Storage......................................................................................................................................... 16
Troubleshooting ............................................................................................................................ 17-53
Removal Of The Bendix ESP EC‑80 Controller Assembly................................................................... 17
Obtaining A New Bendix ESP EC‑80 Controller .................................................................................. 17
Installing A New Bendix ESP EC‑80 Controller.................................................................................... 17
Steering Angle Sensor Maintenance..................................................................................................... 18
Steering Angle Sensor Calibration........................................................................................................ 18
Removal Of The Yaw Rate/Lateral Acceleration Sensor...................................................................... 19
Brake Demand Sensor Calibration........................................................................................................ 20
Pressure Sensor Installation Requirements.......................................................................................... 20
Troubleshooting: Blink Codes and Diagnostic Modes...................................................................... 21-23
ECU Diagnostics................................................................................................................................... 21
Blink Codes........................................................................................................................................... 21
Diagnostic Modes.................................................................................................................................. 22
Troubleshooting: Using PC-Based or Hand-Held Diagnostic Tools................................................. 24-25
Bendix® ACom® Diagnostic Software.................................................................................................... 24
Bendix® RDU™ (Remote Diagnostic Unit).............................................................................................. 24
Active or Inactive Diagnostic Trouble Codes: Index and Troubleshooting Tests..............................26-47
Troubleshooting: Connectors................................................................................................................ 48
Troubleshooting: Wiring....................................................................................................................49-53
Glossary................................................................................................................................................ 54
APPENDIX A: Troubleshooting a 12-7 Blink Code DTC (SID-93 FMI-4) (SPN‑0802 FMI-04)............ 55
APPENDIX B: J1939 SPN and FMI Codes and their Bendix Blink Code Equivalents....................56-62

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