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PACCAR MX-13 EPA2013 Diagnostic Manual - P3874 to P3997 - wk32

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2013 PACCAR MX Diagnostic Service Manual 194 | Page problem with the power supply for 10 consecutive seconds. Reset condition of fault code x Run a stationary regeneration with DAVIE to raise temperatures and reach dew…

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P3917
Code number Fault code description

P3917 NOx sensor after catalyst - Heater element error

Fault code information Description of component(s)

1 trip MIL 3 drive cycle recovery Readiness group - None Freeze frame type -Comprehensive

Location of component(s)

DESCRIPTIONS COMPONENTS, NOX SENSOR AFTER CATALYST (F843) x Dosing fuel into the exhaust pipe before the oxidation catalyst, during active regeneration; x Ceramic sensor element, heater element and an electronic control unit; x The NOx sensor is connected to the A-CAN.
Effect of the output signal on the system:
x Measures the amount of NOx after the catalyst in order to determine if the NOx level is within the limits.

Diagnostic condition

x This diagnostic runs after the NOx sensor after catalyst (F843) reaches the dew point. The dew point is reached 5 seconds after the temperature after the SCR is higher than 150�C [302�F].

Set condition of fault code

x The DTC is set when the sensor is not powered correctly or if there is a

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Reset condition of fault code Electrical diagram(s)

problem with the power supply for 10 consecutive seconds.
x Run a stationary regeneration with DAVIE to raise temperatures and reach dew point of the NOx sensor after catalyst (F843).
x Monitor the NOx sensor after catalyst (F843) operation until NOx indicates a stable value.

Technical data

Wiring harness connector F843 front view

D374 EAS-3 ECU

E497 Fuse after treatment CAN F943 NOx sensor after catalytic convertor

D374

F843 Function

B14

A-CAN High

B15

A-CAN Low

Power supply

Earth

Component & wiring check, NOx sensor after catalyst (F843)
Preparation
x Disconnect connector F843. x Ignition switched on. x Measure on connector F843

Pin (+ probe) Pin (- probe)

Value

Ubat

Battery negative pole >0.5v

Component & wiring check, A-CAN

Addition information at 20�C Switch all consumer on

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Possible causes
Additional information Diagnostic Step-by-Step

Preparation
x Ignition switched off. x Disconnect connector F843. x Measure on connector F843

Pin (+ probe) Pin (- probe)

Value � 60

Addition information at 20�C

x Open power supply circuit of the NOx sensor after catalyst (F843). x Internal malfunction of the NOx sensor after catalyst (F843). x Check if the sensor is powered correctly x Check the wiring harness for short circuits

x The NOx sensor after catalyst (F843) is not operational x DEF injection is based on pre-programmed values.

Perform the troubleshooting steps below using the breakout harness, if necessary, to check electrical components, such as sensors, electrical control units, and harnesses. Back probing is not recommended, as it could damage the harness. The ignition should always be in the OFF position when connecting or disconnecting electrical components in order to reduce the likelihood of damage to electrical components.
x Disconnecting the EAS connectors during the troubleshooting process will result in multiple errors.
x For specific electrical component information and pin out locations, always refer to the technical data.
x It is necessary to exit the fault code menu in DAVIE and run the diagnostic test again to identify a change in errors.
x Remember that the truck's operational or mechanical issues may be the root cause of both active and inactive fault codes. Refer to the 'possible causes' section.

Step 1

Step ID 3917a

SRT

Visual Inspection

Visually inspect all applicable connectors (bent, broken, corroded or loose pins)

and harnesses for corrosion, damage, and rubbing during each step of the

diagnostic procedure.

Was there evidence of any of the above?

No: Continue to the next step 2 in the troubleshooting process.

Yes: Clean, adjust, repair, or replace affected components for any issues identified.

Use DAVIE to re-check for the presence of active faults.

x If this related fault is no longer active, then this issue has been resolved.

x If this related fault is still active, continue to the next step 2 in the

troubleshooting process.

Step 2 2013 PACCAR MX Diagnostic Service Manual

Step ID 3917b

SRT

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1. Turn the key switch ON. 2. Use DAVIE to check for fault codes.
Is fault code P3921, P3873, or P3816 active?
x Yes � Proceed with the appropriate fault code x No � Proceed to step 3

Step 3

Step ID 3917c

SRT

1. Turn the key switch ON.

2. Use DAVIE to check for line heating fault codes.

Is fault code P3917 active?
x Yes � An internal error has been detected in the NOx sensor. Replace the NOx sensor. Proceed to step 4
x No � Proceed to step 4

Step 4

Step ID 3917d

SRT

1. Connect all components.

2. Operate the system within 'reset condition of the fault code' found in the fault

code information.

3. Use DAVIE to verify if the fault codes are inactive.

Is fault code P3917 inactive?
x Yes � Proceed to step 5 x No � Return to the troubleshooting steps Proceed to step 1

If all the steps have been completed and rechecked, contact the Engine Support Center for further instructions.

Verification Drive Cycle

Step 5

Step ID 3917e

SRT

1. Connect all components.

2. Turn the key switch ON.

3. Use DAVIE to clear the inactive fault codes.

Have all the fault codes been cleared?
x Yes � Repair complete x No � Troubleshoot any remaining active fault codes
Perform the same procedure outlined for the Steady State cycle. Using DAVIE, select the following Monitor values to record:

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x Exhaust Temperature Before SCR x Exhaust Temperature After SCR x Pump Module
Once the SCR temperatures have reached a minimum of 536�F (280�C), continue the remainder of this cycle with the high idle. The monitored Pump Module value will indicate when dosing starts. Allow dosing to occur for a minimum of 15 minutes. Check the recorded values after the driving has been completed to verify temperatures and dosing.
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