Nissan 2007 Titan Owners Manual MTC

mtc mtc

2015-10-23

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J AIR CONDITIONER

SECTION

MTC

MANUAL AIR CONDITIONER

CONTENTS
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER” .................................................................. 4
Precautions for Working with HFC-134a (R-134a)..... 4
Contaminated Refrigerant ........................................ 4
General Refrigerant Precautions .............................. 5
Precautions for Leak Detection Dye ......................... 5
A/C Identification Label ............................................ 5
Precautions for Refrigerant Connection ................... 6
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 6
O-RING AND REFRIGERANT CONNECTION ..... 7
Precautions for Servicing Compressor ..................... 9
Precautions for Service Equipment .......................... 9
RECOVERY/RECYCLING EQUIPMENT .............. 9
ELECTRONIC LEAK DETECTOR ........................ 9
VACUUM PUMP ................................................. 10
MANIFOLD GAUGE SET .................................... 10
SERVICE HOSES ............................................... 10
SERVICE COUPLERS .........................................11
REFRIGERANT WEIGHT SCALE .......................11
CHARGING CYLINDER .......................................11
PREPARATION ......................................................... 12
Special Service Tools ............................................. 12
HFC-134a (R-134a) Service Tools and Equipment... 12
Commercial Service Tools ...................................... 15
REFRIGERATION SYSTEM ..................................... 16
Refrigerant Cycle ................................................... 16
REFRIGERANT FLOW ....................................... 16
Refrigerant System Protection ............................... 16
REFRIGERANT PRESSURE SENSOR ............. 16
PRESSURE RELIEF VALVE ............................... 17
Component Layout ................................................. 18
REFRIGERATION SYSTEM ............................... 18
OIL ............................................................................ 20
Maintenance of Oil Quantity in Compressor .......... 20
OIL ...................................................................... 20
CHECKING AND ADJUSTING ........................... 20
AIR CONDITIONER CONTROL ............................... 23

Revision: August 2006

Description .............................................................. 23
Operation ................................................................ 23
AIR MIX DOOR CONTROL ................................. 23
BLOWER SPEED CONTROL ............................. 23
INTAKE DOORS CONTROL ............................... 23
MODE DOOR CONTROL ................................... 23
DEFROSTER DOOR CONTROL ........................ 23
MAGNET CLUTCH CONTROL ........................... 23
Description of Control System ................................ 25
Control Operation ................................................... 25
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL) ............................................... 26
RECIRCULATION () SWITCH ............................. 26
REAR WINDOW DEFOGGER SWITCH (CREW
CAB) .................................................................... 26
OFF SWITCH (BLOWER SPEED SET TO 0) ..... 26
A/C SWITCH ....................................................... 26
MODE CONTROL DIAL ...................................... 26
FRONT BLOWER CONTROL DIAL .................... 26
Discharge Air Flow ................................................. 26
System Description ................................................. 27
SWITCHES AND THEIR CONTROL FUNCTION... 27
CAN Communication System Description .............. 28
TROUBLE DIAGNOSIS ............................................ 29
CONSULT-II Function (HVAC) ................................ 29
CONSULT-II START PROCEDURE .................... 29
SELF-DIAGNOSIS .............................................. 29
DATA MONITOR ................................................. 29
CONSULT-II Function (BCM) ................................. 30
CONSULT-II START PROCEDURE .................... 30
DATA MONITOR ................................................. 30
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 30
WORK FLOW ...................................................... 30
SYMPTOM TABLE .............................................. 30
Component Parts and Harness Connector Location... 32
ENGINE COMPARTMENT .................................. 32
PASSENGER COMPARTMENT ......................... 33
Schematic ............................................................... 34
Wiring Diagram — A/C,M — ................................... 35

MTC-1

2007 Titan

MTC

Front Air Control Terminals and Reference Values... 41
FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT ................................... 41
TERMINALS AND REFERENCE VALUES FOR
FRONT AIR CONTROL ....................................... 41
Operational Check .................................................. 43
CHECKING BLOWER ......................................... 43
CHECKING DISCHARGE AIR ............................ 43
CHECKING RECIRCULATION (, ONLY) ............. 43
CHECKING TEMPERATURE DECREASE ......... 43
CHECKING TEMPERATURE INCREASE .......... 43
CHECK A/C SWITCH .......................................... 43
Power Supply and Ground Circuit for Front Air Control ........................................................................... 44
INSPECTION FLOW ........................................... 44
COMPONENT DESCRIPTION ............................ 45
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM... 45
Mode Door Motor Circuit ........................................ 47
INSPECTION FLOW ........................................... 47
SYSTEM DESCRIPTION .................................... 47
COMPONENT DESCRIPTION ............................ 48
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 48
Air Mix Door Motor Circuit ...................................... 52
INSPECTION FLOW ........................................... 52
SYSTEM DESCRIPTION .................................... 53
COMPONENT DESCRIPTION ............................ 53
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (FRONT) .................................... 53
Intake Door Motor Circuit ........................................ 57
INSPECTION FLOW ........................................... 57
SYSTEM DESCRIPTION .................................... 58
COMPONENT DESCRIPTION ............................ 58
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR ................................................... 59
Defroster Door Motor Circuit ................................... 61
SYMPTOM: .......................................................... 61
INSPECTION FLOW ........................................... 61
SYSTEM DESCRIPTION .................................... 62
COMPONENT DESCRIPTION ............................ 62
DIAGNOSTIC PROCEDURE FOR
DEFROSTER DOOR MOTOR ............................ 62
Front Blower Motor Circuit ...................................... 66
INSPECTION FLOW ........................................... 66
SYSTEM DESCRIPTION .................................... 67
COMPONENT DESCRIPTION ............................ 67
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ............................................................... 68
COMPONENT INSPECTION .............................. 72
Magnet Clutch Circuit ............................................. 73
INSPECTION FLOW ........................................... 73
SYSTEM DESCRIPTION .................................... 74
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH .............................................................. 74
Insufficient Cooling ................................................. 79
INSPECTION FLOW ........................................... 79
PERFORMANCE TEST DIAGNOSES ................ 81
PERFORMANCE CHART ................................... 83
TROUBLE DIAGNOSES FOR UNUSUAL PRESRevision: August 2006

SURE ...................................................................84
Insufficient Heating .................................................87
INSPECTION FLOW ............................................87
Noise .......................................................................89
INSPECTION FLOW ............................................89
Water Valve Circuit ..................................................90
COMPONENT DESCRIPTION ............................90
DIAGNOSTIC PROCEDURE FOR WATER
VALVE ..................................................................90
Intake Sensor Circuit ...............................................92
COMPONENT DESCRIPTION ............................92
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR .....................................................................92
COMPONENT INSPECTION ...............................93
CONTROL UNIT ........................................................94
Removal and Installation .........................................94
REMOVAL ............................................................94
INSTALLATION ....................................................94
INTAKE SENSOR ......................................................95
Removal and Installation .........................................95
REMOVAL ............................................................95
INSTALLATION ....................................................95
BLOWER MOTOR .....................................................96
Removal and Installation .........................................96
REMOVAL ............................................................96
INSTALLATION ....................................................96
IN-CABIN MICROFILTER ..........................................97
Removal and Installation .........................................97
FUNCTION ..........................................................97
REPLACEMENT TIMING ....................................97
REPLACEMENT PROCEDURE ..........................97
HEATER & COOLING UNIT ASSEMBLY .................99
Removal and Installation .........................................99
REMOVAL ............................................................99
INSTALLATION .................................................. 100
HEATER CORE ....................................................... 101
Removal and Installation ....................................... 101
REMOVAL .......................................................... 102
INSTALLATION .................................................. 102
DEFROSTER DOOR MOTOR ................................. 103
Removal and Installation ....................................... 103
REMOVAL .......................................................... 103
INSTALLATION .................................................. 103
INTAKE DOOR MOTOR .......................................... 104
Removal and Installation ....................................... 104
REMOVAL .......................................................... 104
INSTALLATION .................................................. 104
MODE DOOR MOTOR ............................................ 105
Removal and Installation ....................................... 105
REMOVAL .......................................................... 105
INSTALLATION .................................................. 105
AIR MIX DOOR MOTOR ......................................... 106
Removal and Installation ....................................... 106
REMOVAL .......................................................... 106
INSTALLATION .................................................. 106
VARIABLE BLOWER CONTROL ........................... 107
Removal and Installation ....................................... 107
REMOVAL .......................................................... 107
INSTALLATION .................................................. 107

MTC-2

2007 Titan

DUCTS AND GRILLES .......................................... 108
Removal and Installation ...................................... 108
DEFROSTER NOZZLE ..................................... 109
RH AND LH SIDE DEMISTER DUCT ............... 109
RH AND LH VENTILATOR DUCT ..................... 109
CENTER VENTILATOR DUCT ..........................110
FLOOR DUCT ....................................................110
GRILLES ............................................................110
REFRIGERANT LINES ............................................ 111
HFC-134a (R-134a) Service Procedure ................ 111
SETTING OF SERVICE TOOLS AND EQUIPMENT ................................................................. 111
Components ..........................................................113
Removal and Installation for Compressor .............114
REMOVAL ..........................................................114
INSTALLATION ..................................................115
Removal and Installation for Compressor Clutch ..115
REMOVAL ..........................................................115
INSPECTION .....................................................116
INSTALLATION ..................................................117
BREAK-IN OPERATION ....................................118
Removal and Installation for Low-pressure Flexible
Hose ......................................................................118
REMOVAL ..........................................................118
INSTALLATION ..................................................118
Removal and Installation for High-pressure Flexible
Hose ......................................................................118
REMOVAL ..........................................................118
INSTALLATION ..................................................118
Removal and Installation for High-pressure Pipe ..119
REMOVAL ..........................................................119
INSTALLATION ..................................................119

Removal and Installation for Low-pressure Pipe . 119
REMOVAL ......................................................... 119
INSTALLATION ................................................. 119
Removal and Installation for Refrigerant Pressure
Sensor .................................................................. 119
REMOVAL ......................................................... 119
INSTALLATION ................................................. 119
Removal and Installation for Condenser .............. 120
REMOVAL ......................................................... 120
INSTALLATION ................................................. 120
Removal and Installation for Evaporator .............. 121
REMOVAL ......................................................... 121
INSTALLATION ................................................. 122
Removal and Installation for Expansion Valve ...... 122
REMOVAL ......................................................... 122
INSTALLATION ................................................. 122
Checking for Refrigerant Leaks ............................ 122
PRELIMINARY CHECK ..................................... 122
Checking System for Leaks Using the Fluorescent
Dye Leak Detector ................................................ 122
Dye Injection ......................................................... 123
Electronic Refrigerant Leak Detector .................... 123
PRECAUTIONS FOR HANDLING LEAK
DETECTOR ....................................................... 123
CHECKING PROCEDURE ............................... 124
SERVICE DATA AND SPECIFICATIONS (SDS) .... 126
Service Data and Specifications (SDS) ................ 126
COMPRESSOR ................................................ 126
OIL ..................................................................... 126
REFRIGERANT ................................................. 126
ENGINE IDLING SPEED .................................. 126
BELT TENSION ................................................. 126

MTC

Revision: August 2006

MTC-3

2007 Titan

PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”

EJS0031M

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.
WARNING:
●
To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
●
Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
●
Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for Working with HFC-134a (R-134a)

EJS0031N

WARNING:
●
CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to MTC-4, "Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use recovery/recycling
equipment and refrigerant identifier.
●
Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components.
If oil other than that specified is used, compressor failure is likely to occur.
●
The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
–
When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
–
When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible to minimize the entry of moisture into system.
–
Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
–
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting
requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a)
recovery equipment]. If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufacturers.
–
Do not allow oil, NISSAN A/C System Oil Type S (DH-PS) or equivalent, to come in contact with styrofoam parts. Damage may result.

Contaminated Refrigerant

EJS0031O

If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
●
Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant
into the atmosphere.
●
Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant supply.
●
Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
Revision: August 2006

MTC-4

2007 Titan

PRECAUTIONS
●

●

If you choose to perform the repair, recover the refrigerant using only dedicated equipment and containers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system components on the vehicle is recommended.
If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN
Customer Affairs for further assistance.

General Refrigerant Precautions

EJS0031P

WARNING:
●
Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
●
Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
●
Do not store or heat refrigerant containers above 52°C (125°F).
●
Do not heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
●
Do not intentionally drop, puncture, or incinerate refrigerant containers.
●
Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
●
Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
●
Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a)
have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause
injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers.

Precautions for Leak Detection Dye
●
●
●

●
●
●
●

●
●
●

●

EJS0031Q

The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
(UV) lamp is required to illuminate the dye when inspecting for leaks.
MTC
Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of
the fluorescent dye.
The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluorescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J- K
41995).
For your safety and the customer's satisfaction, read and follow all manufacturer's operating instructions
L
and precautions prior to performing work.
A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).
Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a M
future service.
Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period
of time cannot be removed .
Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.
Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use
HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection
dye in HFC-134a (R-134a) A/C systems or A/C system damage may result.
The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.

A/C Identification Label

EJS0031R

Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.

Revision: August 2006

MTC-5

2007 Titan

PRECAUTIONS
Precautions for Refrigerant Connection

EJS0031S

A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
●
Expansion valve to cooling unit
●
Evaporator pipes to evaporator (inside cooling unit)
●
Refrigerant pressure sensor

FEATURES OF NEW TYPE REFRIGERANT CONNECTION
●

●

The O-ring has been relocated. It has also been provided with a groove for proper installation. This
reduces the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction
of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.
The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.

SHA815E

Revision: August 2006

MTC-6

2007 Titan

PRECAUTIONS
O-RING AND REFRIGERANT CONNECTION
A

A/C Compressor and Condenser

MTC

WJIA1577E

Revision: August 2006

MTC-7

2007 Titan

PRECAUTIONS
1.

High-pressure service valve

Grommet

High-pressure pipe

Refrigerant pressure sensor

Condenser

Compressor shaft seal

High-pressure flexible hose

Low-pressure flexible hose

Low-pressure service valve

10. Low-pressure pipe

11. Expansion valve

12. Drain hose

CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or
around the connection.

O-Ring Part Numbers and Specifications
Connection type

O-ring
size

Part number*

New

92471 N8210

6.8 (0.268)

1.85 (0.0728)

Former

J2476 89956

9.25 (0.3642)

1.78 (0.0701)

92472 N8210

10.9 (0.429)

2.43 (0.0957)

New
Former
New
Former
New
SHA814E

Former
New

19
24

mm (in)

W mm (in)

92475 71L00

11.0 (0.433)

2.4 (0.094)

92473 N8210

13.6 (0.535)

2.43 (0.0957)

92475 72L00

14.3 (0.563)

2.3 (0.091)

92474 N8210

16.5 (0.650)

2.43 (0.0957)

92477 N8200

17.12 (0.6740)

1.78 (0.0701)

92195 AH300

21.8 (0.858)

2.4 (0.094)

*: Always check with the Parts Department for the latest parts information.

WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
●
When the compressor is removed, store it in the same position as it is when mounted on the car.
Failure to do so will cause oil to enter the low pressure chamber.
●
When connecting tubes, always use a torque wrench and a back-up wrench.
●
After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
●
When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for
connection.
●
Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
●
Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
●
Always replace used O-rings.
●
When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to
apply oil to threaded portion.
Oil name: NISSAN A/C System Oil Type S (DH-PS)
Part number: KLH00-PAGS0
●
O-ring must be closely attached to dented portion of tube.
●
When replacing the O-ring, be careful not to damage O-ring and tube.
●
Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.

Revision: August 2006

MTC-8

2007 Titan

PRECAUTIONS
●

After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.

G
RHA861F

Precautions for Servicing Compressor
●
●
●
●
●

●

EJS0031T

H
Plug all openings to prevent moisture and foreign matter from entering.
When the compressor is removed, store it in the same position as it is when mounted on the car.
When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”
I
exactly. Refer to MTC-20, "Maintenance of Oil Quantity in Compressor" .
Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil,
wipe it off by using a clean waste cloth moistened with thinner.
MTC
After compressor service operation, turn the compressor shaft by hand more than 5 turns in both
directions. This will equally distribute oil inside the compressor. After the compressor is installed,
let the engine idle and operate the compressor for 1 hour.
After replacing the compressor magnet clutch, apply voltage to the new one and check for normal K
operation. Refer to MTC-115, "Removal and Installation for Compressor Clutch".

Precautions for Service Equipment

EJS0031U

RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.

Revision: August 2006

MTC-9

2007 Titan

PRECAUTIONS
VACUUM PUMP
The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of
the vacuum pump is exposed to atmospheric pressure so the vacuum pump oil may migrate out of the pump into the service hose.
This is possible when the pump is switched off after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
●
Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.
●
For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.
●
If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.
RHA270D

MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFC-134a (R-134a or
134a). Make sure the gauge set has 1/2″-16 ACME threaded connections for service hoses. Confirm the set has been used only with
refrigerant HFC-134a (R-134a) along with specified oil.

SHA533D

SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.

RHA272D

Revision: August 2006

MTC-10

2007 Titan

PRECAUTIONS
SERVICE COUPLERS
A

Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. If an improper
connection is attempted, discharging and contamination may occur.
Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

RHA273D

REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC134a (R-134a) and specified
oils have been used with the scale. If the scale controls refrigerant
flow electronically, the hose fitting must be 1/2”-16 ACME.

RHA274D

CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.

MTC

Revision: August 2006

MTC-11

2007 Titan

PREPARATION
PREPARATION
Special Service Tools

PFP:00002
EJS003RG

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name

Description

—
(J-38873-A)
Pulley installer

Installing pulley

LHA171

KV99233130
(J-29884)
Pulley puller

Removing pulley

LHA172

HFC-134a (R-134a) Service Tools and Equipment

EJS003RH

Never mix HFC-134a (R-134a) refrigerant and/or the specified oil with CFC-12 (R-12) refrigerant and/or the
oil.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil.
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed
use of the refrigerants/oil.
Adapters that convert one size fitting to another must never be used refrigerant/oil contamination will occur
and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool name

Description

HFC-134a (R-134a)
( — )
Refrigerant

Container color: Light blue
Container marking: HFC-134a (R134a)
Fitting size: Thread size
●

large container 1/2”-16 ACME

S-NT196

Type: Poly alkylene glycol oil (PAG),
type S (DH-PS)
Application: HFC-134a (R-134a)
swash plate compressors (NISSAN
only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)

KLH00-PAGR0
( — )
NISSAN A/C System Oil Type S
(DH-PS)

S-NT197

Refrigerant recovery and recycling and
recharging

KV991J0130
(ACR2005-NI)
ACR5 A/C Service Center

WJIA0293E

Revision: August 2006

MTC-12

2007 Titan

PREPARATION
Tool number
(Kent-Moore No.)
Tool name

Description

—
(J-41995)
Electronic refrigerant leak detector

Power supply:

●

DC 12V (battery terminal)

D
AHA281A

—
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220) UV lamp and UV safety
goggles
(J-41459) Refrigerant dye injector
(J-41447) qty. 24
HFC-134a (R-134a) refrigerant
dye
(J-43872) Refrigerant dye cleaner

Power supply:
●

DC 12V (battery terminal)

H
ZHA200H

Power supply:

—
(J-42220)
Fluorescent dye leak detector

●

DC 12V (battery terminal)

For checking refrigerant leak when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety goggles

MTC

SHA438F

Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labels for affixing to vehicle after
charging system with dye.)

—
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)

SHA439F

SHA440F

—
(J-43872)
Refrigerant dye cleaner

For cleaning dye spills.

SHA441F

Revision: August 2006

MTC-13

M
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.

—
(J-41459)
HFC-134a (R-134a) Dye injector
Use with J-41447, 1/4 ounce bottle

2007 Titan

PREPARATION
Tool number
(Kent-Moore No.)
Tool name

Description

—
(J-39183-C)
Manifold gauge set (with hoses
and couplers)

Identification:
●

The gauge face indicates R-134a.
Fitting size-Thread size

●

1/2”-16 ACME

RJIA0196E

Hose color:

Service hoses:
●

High side hose
(J-39500-72B)

●

Low side hose
(J-39500-72R)

●

Utility hose
(J-39500-72Y)

S-NT201

High side coupler
(J-39500-20A)

●

Low side coupler
(J-39500-24A)

Low side hose: Blue with black stripe

●

High side hose: Red with black stripe

●

Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:

●

1/2”-16 ACME

Hose fitting to service hose:

Service couplers
●

●

M14 x 1.5 fitting is optional or permanently attached.

S-NT202

For measuring of refrigerant
Fitting size-Thread size

—
(J-39699)
Refrigerant weight scale

●

1/2”-16 ACME

S-NT200

Capacity:

—
(J-39649)
Vacuum pump
(Including the isolator valve)

●

Air displacement: 4 CFM

●

Micron rating: 20 microns

●

Oil capacity: 482 g (17 oz)
Fitting size-Thread size

●

1/2”-16 ACME

S-NT203

Revision: August 2006

MTC-14

2007 Titan

PREPARATION
Commercial Service Tools

EJS003RI

A
Tool name

Description

(J-41810-NI)
Refrigerant identifier equipment (R134a)

For checking refrigerant purity and
system contamination

D
RJIA0197E

Power tool

Loosening bolts and nuts

PBIC0190E

(J-44614)
Clutch disc holding tool

G
Clutch disc holding tool

WHA230

MTC

Revision: August 2006

MTC-15

2007 Titan

REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Refrigerant Cycle

PFP:KA990
EJS0031Z

REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coils
is controlled by externally equalized expansion valve, located inside the evaporator case.

Refrigerant System Protection

EJS00320

REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm2 , 398 psi), or below
about 120 kPa (1.22 kg/cm2 , 17.4 psi).

Revision: August 2006

MTC-16

2007 Titan

REFRIGERATION SYSTEM
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm2 , 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant
into the atmosphere.

MTC

WJIA1347E

Revision: August 2006

MTC-17

2007 Titan

REFRIGERATION SYSTEM
Component Layout

EJS00321

REFRIGERATION SYSTEM

LJIA0141E

Revision: August 2006

MTC-18

2007 Titan

REFRIGERATION SYSTEM
1.

Defroster nozzle

LH side demister duct

LH ventilator duct

RH side demister duct

RH ventilator duct

Center ventilator duct

Heater and cooling unit assembly

Floor duct

Clips

MTC

Revision: August 2006

MTC-19

2007 Titan

OIL
OIL
Maintenance of Oil Quantity in Compressor

PFP:KLG00
EJS004W9

The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the specified amount.
If oil quantity is not maintained properly, the following malfunctions may result:
●
Lack of oil: May lead to a seized compressor
●
Excessive oil: Inadequate cooling (thermal exchange interference)

OIL
Name: NISSAN A/C System Oil Type S (DH-PS) or equivalent
Part number: KLH00-PAGS0

CHECKING AND ADJUSTING
CAUTION:
If excessive oil leakage is noted, do not perform the oil return operation.
Start the engine and set the following conditions:
Test Condition
●
Engine speed: Idling to 1,200 rpm
●
A/C switch: On
●
Blower fan speed: MAX position
●
Temp. control: Optional [Set so that intake air temperature is 25° to 30° C (77° to 86°F)]
●
Intake position: Recirculation (
)
●
Perform oil return operation for about ten minutes
Adjust the oil quantity according to the following table.

Oil Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of oil to the system.
Amount of Oil to be Added
Oil to be added to system
Part replaced
m

Amount of oil
(US fl oz, Imp fl oz)

Evaporator

75 (2.5, 2.6)

Condenser

75 (2.5, 2.6)

—

Liquid tank

5 (0.2, 0.2)

Add if compressor is not replaced.

30 (1.0, 1.1)

Large leak

—

Small leak *1

In case of refrigerant leak
●

Remarks

—

*1: If refrigerant leak is small, no addition of oil is needed.

Revision: August 2006

MTC-20

2007 Titan

OIL
Oil Adjustment Procedure for Compressor Replacement
A

MTC
WJIA1716E

1.
2.
3.
4.
5.
6.
7.
8.
9.

New compressor

Old compressor

Recovery/recycling equipment

Measuring cup X

Measuring cup Y

New oil

Drain oil from the new compressor
into clean container

Record amount of oil recovered

Add an additional 5 m (0.2 US fl oz,
0.2 Imp fl oz) of new oil when replacing liquid tank

Install new oil equal to recorded
amounts in measuring cups X plus Y

Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to ATC-4, "Contaminated Refrigerant" .
Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to ATC-4, "Contaminated Refrigerant" .
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the
recovery/recycling equipment.
Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of
oil drained.
Drain the oil from the “new” compressor into a separate, clean container.
Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to
“new” compressor through the suction port opening.
Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.
If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this
time.

Revision: August 2006

MTC-21

2007 Titan

OIL
CAUTION:
Do not add this 5 m

Revision: August 2006

(0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.

MTC-22

2007 Titan

AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Description

PFP:27500

A
EJS003TN

The front air control provides regulation of the vehicle's interior temperature. The system is based on the position of the front air controls temperature switch selected by the driver. This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals from the following two sensors:
●
Intake sensor
●
PBR (position balanced resistor).
The front air control uses these signals (including the set position of the temperature switch) to control:
●
Outlet air volume
●
Air temperature
●
Air distribution

Operation

EJS003TO

AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
control dial.

BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned clockwise, and decreases air flow volume each time the blower switch is turned counterclockwise.

INTAKE DOORS CONTROL

The intake doors are controlled by the recirculation switch setting, and the mode (recirculation is not allowed in
floor, floor/defrost or defrost modes) control dial setting.
I

MODE DOOR CONTROL
The mode door is controlled by the position of the mode control dial.

DEFROSTER DOOR CONTROL

MTC

The defroster door is controlled by turning the defroster dial to front defroster.

MAGNET CLUTCH CONTROL

WJIA2278E

When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM and front air control, via CAN communication line.

Revision: August 2006

MTC-23

2007 Titan

AIR CONDITIONER CONTROL
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.

Revision: August 2006

MTC-24

2007 Titan

AIR CONDITIONER CONTROL
Description of Control System

EJS003TP

The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:

MTC

WJIA1448E

Control Operation

EJS003TQ

Front air control

WJIA1405E

Revision: August 2006

MTC-25

2007 Titan

AIR CONDITIONER CONTROL
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)
Increases or decreases the set temperature.

RECIRCULATION () SWITCH
●
●
●

When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automatically turned OFF. REC mode can be re-entered by pressing REC switch again.
REC switch is not operated when DEF switch is turned ON, at the D/F position or in floor mode.

REAR WINDOW DEFOGGER SWITCH (CREW CAB)
When switch is ON, rear window and door mirrors are defogged.

OFF SWITCH (BLOWER SPEED SET TO 0)
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot position.

A/C SWITCH
The compressor is ON or OFF.

MODE CONTROL DIAL
Controls the air discharge outlets through control of the mode and defroster doors.

FRONT BLOWER CONTROL DIAL
Manually control the blower speed. Fourteen speeds are available for manual control.

Discharge Air Flow

EJS003TR

WJIA0540E

WJIA1297E

Revision: August 2006

MTC-26

2007 Titan

AIR CONDITIONER CONTROL
System Description

EJS003TS

SWITCHES AND THEIR CONTROL FUNCTION

I
WJIA0531E

MTC

WJIA1406E

Revision: August 2006

MTC-27

2007 Titan

AIR CONDITIONER CONTROL
CAN Communication System Description

EJS003TU

Refer to LAN-2, "SYSTEM DESCRIPTION" .

Revision: August 2006

MTC-28

2007 Titan

TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
CONSULT-II Function (HVAC)

PFP:00004

A
EJS003TV

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
Diagnostic mode

Description

SELF-DIAG RESULTS

Displays front air control self-diagnosis results.

DATA MONITOR

Displays front air control input/output data in real time.

CAN DIAG SUPPORT MNTR

The result of transmit/receive diagnosis of CAN communication can be read.

ECU PART NUMBER

Front air control part number can be read.

CONSULT-II START PROCEDURE
Refer to GI-38, "CONSULT-II Start Procedure" .
E

SELF-DIAGNOSIS
Display Item List
DTC

Description

Reference page

B2573

Battery voltage out of range

B2581

Intake sensor circuit short

SC-4, "BATTERY"

B2582

Intake sensor circuit open

U1000

CAN bus fault

LAN-2, "CAN Communication System"

B2587

Stuck button

MTC-94, "CONTROL UNIT"

G
MTC-57, "Intake Door Motor Circuit"

DATA MONITOR
Display Item List
Monitor item
BATT VIA CAN

I
Value

Contents

"V"

Displays battery voltage signal.

"ON/OFF"

Displays ignition switch signal.

EVAP TEMP SEN

"°C/°F"

Displays intake sensor signal.

RR TEMPSET FR

"V"

IGN VIA CAN

MTC

Displays air mix door (front) set point signal.

MODE FDBCK

"V"

Displays mode door motor feedback signal.

DVR MIX FDBCK

"V"

Displays air mix door motor (front) feedback signal.

DEF FDBCK

"V"

Displays defroster door motor feedback signal.

RECIRC

"ON/OFF"

Displays recirculation switch signal.

A/C

"ON/OFF"

Displays A/C switch signal.

RR DEFOG

"ON/OFF"

Displays rear defroster request signal.

MODE SELECT

" [ PNL ]"
" [ MIX ]"
" [ FLR ]"
" [ DEFR ]"
" [ MAX ]"
" [ DENT ]"

Displays mode door motor position.

*: DENT is displayed when MODE switch is between selections.

Revision: August 2006

MTC-29

2007 Titan

TROUBLE DIAGNOSIS
CONSULT-II Function (BCM)

EJS003TW

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
BCM diagnostic
test item

Diagnostic mode

Description
Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.

WORK SUPPORT
DATA MONITOR

Displays BCM input/output data in real time.

ACTIVE TEST

Inspection by part

Operation of electrical loads can be checked by sending drive signal to them.

SELF-DIAG RESULTS

Displays BCM self-diagnosis results.

CAN DIAG SUPPORT MNTR
ECU PART NUMBER
CONFIGURATION

The result of transmit/receive diagnosis of CAN communication can be read.
BCM part number can be read.
Performs BCM configuration read/write functions.

CONSULT-II START PROCEDURE
GI-38, "CONSULT-II Start Procedure".

DATA MONITOR
Display Item List
Monitor item name “operation or
unit”

Contents
Displays “IGN Position (ON)/(OFF), ACC Position (OFF)” status as judged from ignition switch signal.

IGN ON SW

“ON/OFF”

COMP ON SIG

“ON/OFF”

Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.

FAN ON SIG

“ON/OFF”

Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.

How to Perform Trouble Diagnosis for Quick and Accurate Repair

EJS003TX

WORK FLOW

SHA900E

MTC-43, "Operational Check".

SYMPTOM TABLE
Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

MTC-44

A/C system cannot be controlled.

Go to Self-diagnosis Function.

MTC-29

Go to Trouble Diagnosis Procedure for Mode Door Motor.

MTC-47

Go to Trouble Diagnosis Procedure for Air Mix Door Motor
(Front).

MTC-52

Go to Trouble Diagnosis Procedure for Intake Door Motor.

MTC-57

Go to Trouble Diagnosis Procedure for Defroster Door Motor.

MTC-61

Air outlet does not change.
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Air mix door motor (front) is malfunctioning.
Intake door does not change.
Intake door motor is malfunctioning.
Defroster door motor is malfunctioning.

Revision: August 2006

MTC-30

2007 Titan

TROUBLE DIAGNOSIS
Symptom

Reference Page

Front blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

MTC-66

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

MTC-73

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

MTC-79

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

MTC-87

Noise

Go to Trouble Diagnosis Procedure for Noise.

MTC-89

MTC

Revision: August 2006

MTC-31

2007 Titan

TROUBLE DIAGNOSIS
Component Parts and Harness Connector Location

EJS003TY

ENGINE COMPARTMENT

WJIA1924E

Water valve F68

Revision: August 2006

Refrigerant pressure sensor E48
(view with grille removed.)

MTC-32

A/C compressor F3

2007 Titan

TROUBLE DIAGNOSIS
PASSENGER COMPARTMENT
A

MTC

WJIA1925E

Revision: August 2006

MTC-33

2007 Titan

TROUBLE DIAGNOSIS
Schematic

EJS003TZ

WJWA0334E

Revision: August 2006

MTC-34

2007 Titan

TROUBLE DIAGNOSIS
Wiring Diagram — A/C,M —

EJS003U0

MTC

WJWA0335E

Revision: August 2006

MTC-35

2007 Titan

TROUBLE DIAGNOSIS

WJWA0336E

Revision: August 2006

MTC-36

2007 Titan

TROUBLE DIAGNOSIS
A

MTC

WJWA0220E

Revision: August 2006

MTC-37

2007 Titan

TROUBLE DIAGNOSIS

WJWA0337E

Revision: August 2006

MTC-38

2007 Titan

TROUBLE DIAGNOSIS
A

MTC

WJWA0338E

Revision: August 2006

MTC-39

2007 Titan

TROUBLE DIAGNOSIS

WJWA0339E

Revision: August 2006

MTC-40

2007 Titan

TROUBLE DIAGNOSIS
Front Air Control Terminals and Reference Values

EJS003U1

Measure voltage between each terminal and ground by following
Terminals and Reference Value for Front Air Control.

D
WJIA1412E

FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT
E

WJIA2010E

TERMINALS AND REFERENCE VALUES FOR FRONT AIR CONTROL
Ignition
switch

Condition

Voltage (V)
(Approx.)

Sensor power

Air mix door motor (front) CW

Clockwise rotation

Battery voltage

Air mix door motor (front) CCW

Counterclockwise rotation

Battery voltage

Mode door motor CW

Clockwise rotation

Battery voltage

P/L

Mode door motor CCW

Counterclockwise rotation

Battery voltage

Intake door motor CCW

Counterclockwise rotation

Battery voltage

G/B

Intake door motor CW

Clockwise rotation

Battery voltage

L/B

Intake sensor

0 - 5V

Y/B

Rear defroster request

Battery voltage

Terminal No.

Wire
color

Ground

W/G

BR/W

Item

A/C switch OFF

A/C switch ON

MTC

W/R

Compressor ON signal

Y/G

Power supply for IGN

Battery voltage

Sensor ground

Mode door motor feedback

0 - 5V

Air mix door motor (front) feedback

Defroster door motor CW

Clockwise rotation

Battery voltage

P/B

Defroster door motor CCW

Counterclockwise rotation

Battery voltage

V/R

Sensor return

0 - 5V

Y/R

Power supply for BAT

Battery voltage

R/L

Illumination +

Revision: August 2006

Park lamps ON

MTC-41

0 - 5V

Battery voltage

2007 Titan

TROUBLE DIAGNOSIS
Terminal No.

Wire
color

Item

Illumination -

Ignition
switch

Condition

Voltage (V)
(Approx.)

Park lamps ON

PIIA2344E

LG/B

R/B

Y/L

W/G

Defroster door motor feedback

Front blower request

Water valve

Front blower motor OFF

Battery voltage

Front blower motor ON

Water valve open

Water valve closed

Water valve open

Water valve closed
34

CAN-H

CAN-L

36
40

L/R
G/R

Fan ON signal
Variable Blower Control output

Revision: August 2006

0 - 5V

Battery voltage

0 - 5V

Blower control dial OFF

Blower control dial ON

MTC-42

0 - 5V

2007 Titan

TROUBLE DIAGNOSIS
Operational Check

EJS003U3

The purpose of the operational check is to confirm that the system operates properly.
Conditions

: Engine running and at normal operating temperature
B

CHECKING BLOWER
1.
2.

Turn blower control dial clockwise. Blower should operate on low speed.
Turn the blower control dial again, and continue checking blower speed and fan symbol until all speeds
are checked.
3. Leave blower on maximum speed.
If NG, go to MTC-68, "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR" .
If OK, continue with next check.

CHECKING DISCHARGE AIR
1.
2.

Turn the mode dial to each mode position.
Confirm that discharge air comes out according to the air distribution table. Refer to MTC-26, "Discharge
Air Flow" .
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for MTC-47, "Mode Door Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.

CHECKING RECIRCULATION (, ONLY)
H
1. Press recirculation (
) switch one time. Recirculation indicator should illuminate.
2. Press recirculation (
) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
I
If NG, go to trouble diagnosis procedure for MTC-57, "Intake Door Motor Circuit" .
If OK, continue with next check.
MTC
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF, D/F or floor is selected. Recirculation is not allowed in DEF, D/F, or floor.
K

CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial counterclockwise.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor (front) operation if OK, go to trouble diagnosis procedure for MTC79, "Insufficient Cooling" . If air mix door motor (front) appears to be malfunctioning, go to MTC-53, "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)" .
If OK, continue with next check.

CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor (front) operation. If OK, go to trouble diagnosis procedure for MTC87, "Insufficient Heating" . If air mix door motor (front) appears to be malfunctioning, go to MTC-53, "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)" .
If OK, continue with next check.

CHECK A/C SWITCH
1.
2.

Press A/C switch with the blower control dial in any position except OFF.
A/C switch indicator will turn ON.
● Confirm that the compressor clutch engages (sound or visual inspection).
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-73, "Magnet Clutch Circuit" .
If OK, continue with next check.
Revision: August 2006

MTC-43

2007 Titan

TROUBLE DIAGNOSIS
Power Supply and Ground Circuit for Front Air Control

EJS003U5

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK
1. Press A/C switch.
2. Confirm that the compressor clutch engages (sound or visual inspection).
Can a symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-43, "Operational Check" .
Can a symptom be duplicated
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.

4. CHECK POWER AND GROUND CIRCUIT
Check main power supply and ground circuit. Refer to MTC-45, "DIAGNOSTIC PROCEDURE FOR A/C SYSTEM" .
OK or NG
OK
>> System OK.
NG
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .

Revision: August 2006

MTC-44

2007 Titan

TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Front Air Control

The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor (front), mode door motor, intake
door motor, defroster door motor, blower motor and compressor are
then controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature control dial are operated, data is
input to the front air control.

D
WJIA1412E

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature control
dial.

H
WJIA1413E

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
I

SYMPTOM: A/C system does not come on.

MTC

L
WJIA0414E

Revision: August 2006

MTC-45

2007 Titan

TROUBLE DIAGNOSIS

1. CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1.
2.

Disconnect front air control connector.
Check voltage between front air control harness connector M49
terminals 14 and 22, and ground.
Terminals

Ignition switch position

(+)
Front air
control
connector

Terminal No.

M49

(-)

Ground

OFF

ACC

Approx. 0V

Battery
voltage

WJIA0415E

OK or NG
OK
>> GO TO 2.
NG
>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-79, "FUSE BLOCKJUNCTION BOX (J/B)" .
● If fuses are OK, check harness for open circuit. Repair or replace as necessary.
● If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as necessary.

2. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1.
2.

Turn ignition switch OFF.
Check continuity between front air control harness connector
M49 terminal 1 and ground.
1 - Ground

: Continuity should exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "CONTROL
UNIT" .
NG
>> Repair harness or connector as necessary.
WJIA1351E

Revision: August 2006

MTC-46

2007 Titan

TROUBLE DIAGNOSIS
Mode Door Motor Circuit

EJS003U6

SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1.
2.

Turn the mode dial and check all positions.
Confirm that discharge air comes out according to the air distribution table. Refer to MTC-26, "Discharge
Air Flow" .
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (
) or D/F (
) is selected.
Can a symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-43, "Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS
I

Check for any service bulletins.
MTC

>> GO TO 4.

4. CHECK MODE DOOR OPERATION
K

Check and verify mode door mechanism for smooth operation in each mode.
OK or NG
OK
>> GO TO 5.
NG
>> Repair as necessary.

5. CHECK THE MODE DOOR MOTOR PBR CIRCUIT
M

Perform diagnostic procedure for the mode door motor. Refer to MTC-48, "DIAGNOSTIC PROCEDURE FOR
MODE DOOR MOTOR" .
OK or NG
OK
>> GO TO 6.
NG
>> Repair PBR circuit or replace motor.

6. RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Repair as necessary.
NO
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .

SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Front air control
Revision: August 2006

MTC-47

2007 Titan

TROUBLE DIAGNOSIS
●
●

Mode door motor
PBR (built into mode door motor)

System Operation
The mode door position (vent, B/L, D/F, foot, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The
direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied
to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.

COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assembly. It rotates so that air is discharged from the outlet as indicated by
the front air control. Motor rotation is conveyed to a link which activates the mode door.

WJIA0587E

DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR

1. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1.
2.
3.

Turn ignition switch ON.
Turn the mode dial to the B/L ( ) mode.
Check voltage between front air control harness connector M49
terminal 5 and terminal 6 while turning the mode dial to the floor
( ) mode.
Connector
Front air control:
M49

Terminals
(+)

(-)

Condition

Voltage
(Approx.)

Turn mode
dial

Battery
voltage
WJIA1727E

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.

2. CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 5, 6 and ground.
5 - Ground

: Continuity should not exist.

6 - Ground

: Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "CONTROL
UNIT" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-48

WJIA1734E

2007 Titan

TROUBLE DIAGNOSIS

3. CHECK FRONT AIR CONTROL FOR GROUND AND POWER
1.
2.

Turn the mode dial to the D/F (
) mode.
Check voltage between front air control harness connector M49
terminal 5 and terminal 6 while turning the mode dial to the vent
( ) mode.
Connector
Front air control:
M49

Terminals
(+)

(-)

Condition

Voltage
(Approx.)

Turn mode
dial

Battery
voltage

OK or NG
OK
>> GO TO 4.
NG
>> Replace front air control. Refer to MTC-94, "Removal and Installation" .

D
WJIA1742E

4. CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 5 and terminal 6.

Continuity should exist.
H

OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
WJIA1728E

5. CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1.
2.

MTC

Disconnect the mode door motor harness connector.
Check continuity between front air control harness connector
M49 terminal 5, 6 and the mode door motor harness connector
terminal 5, 6.
5-5
6-6

: Continuity should exist.
: Continuity should exist.

OK or NG
OK
>> Replace mode door motor. Refer to ATC-177, "MODE
DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

M
LJIA0027E

6. CHECK FRONT AIR CONTROL FOR PBR POWER AND GROUND
1.
2.
3.

Reconnect front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 2 and terminal 15.
Connector
Front air control: M49

Terminals
(+)

(-)

Voltage
(Approx.)

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
Revision: August 2006

WJIA1729E

MTC-49

2007 Titan

TROUBLE DIAGNOSIS

7. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and ground.
Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.
WJIA1730E

8. CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and terminal 15.
Continuity should exist.

OK or NG
OK
>> GO TO 10.
NG
>> GO TO 9.
WJIA1731E

9. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1.
2.

Disconnect the mode door motor harness connector.
Check continuity between mode door motor harness connector
M142 (B) terminal 3, 1 and front air control harness connector
M49 (A) terminal 2, 15.
2-3
15 - 1

: Continuity should exist.
: Continuity should exist.

OK or NG
OK
>> Replace mode door motor. Refer to ATC-177, "MODE
DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

WJIA1732E

10. CHECK PBR FEEDBACK VOLTAGE
1.
2.
3.

Reconnect the front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 16 and ground while cycling mode switch through all
modes.
Voltage

: Approx. 1V - 4.5V

OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.

Revision: August 2006

LJIA0032E

MTC-50

2007 Titan

TROUBLE DIAGNOSIS

11. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 16 and ground.

Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

D
WJIA1733E

12. CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the mode door motor harness connector and front
air control harness connector.
Check continuity between mode door motor harness connector
M142 terminal 2 and front air control harness connector M49 terminal 16.

Continuity should exist.
OK or NG
OK
>> Replace mode door motor. Refer to ATC-177, "MODE
DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

H
LJIA0034E

MTC

Revision: August 2006

MTC-51

2007 Titan

TROUBLE DIAGNOSIS
Air Mix Door Motor Circuit

EJS003U7

SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor (front) does not operate.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1.
2.

Turn the temperature control dial clockwise to maximum heat.
Check for hot air at discharge air outlets.
>> GO TO 2.

2. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial counterclockwise to maximum cold.
2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES >> GO TO 4.
NO
>> GO TO 3.

3. PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-43, "Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

4. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 5.

5. CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation from maximum cold to maximum heat in each
mode.
OK or NG
OK
>> GO TO 6.
NG
>> Repair as necessary.

6. CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the air mix door motor. Refer to MTC-52, "Air Mix Door Motor Circuit" .
OK or NG
OK
>> GO TO 7.
NG
>> Repair PBR circuit or replace air mix door motor. Refer to MTC-106, "AIR MIX DOOR MOTOR" .

7. RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .

Revision: August 2006

MTC-52

2007 Titan

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts

Air mix door control system components are:
●
Front air control
●
Air mix door motor (front)
●
PBR (built-into air mix motor)

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the appropriate air mix door motor (front), while ground is applied to the other
circuit, causing the appropriate air mix door motor (front) to rotate. The direction of rotation is determined by
which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the
air mix door positions by measuring the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motor (Front)

H
WJIA0435E

The front air mix door motor is attached to the front heater & cooling
unit assembly. This motor rotates so that the air mix door is opened
or closed to a position set by the front air control. Motor rotation is
then conveyed through a shaft and the air mix door position is then
fed back to the front air control by the PBR built into the air mix door
motor (front).

MTC

K
WJIA1417E

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)

1. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1.
2.
3.

Turn ignition switch ON.
Rotate temperature control dial (front) to maximum heat.
Check voltage between front air control harness connector M49
terminal 3 and terminal 4 while rotating temperature control dial
(front) to maximum cold.
Terminals
Connector
Front air control:
M49

(+)

(-)

Condition

Voltage
(Approx.)

Rotate
temp control dial

Battery
voltage

WJIA1735E

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.

Revision: August 2006

MTC-53

2007 Titan

TROUBLE DIAGNOSIS

2. CHECK AIR MIX DOOR MOTOR (FRONT) CIRCUITS FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 3, 4 and ground.
3 - Ground

: Continuity should not exist.

4 - Ground

: Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

WJIA1736E

3. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1.
2.

Rotate temperature control dial (front) to maximum heat.
Check voltage between front air control harness connector M49
terminal 3 and terminal 4 while rotating temperature control dial
(front) to maximum cold.
Terminals
Connector
Front air control:
M49

(+)

(-)

Condition

Voltage
(Approx.)

Rotate
temp control dial

Battery
voltage
WJIA1737E

OK or NG
OK
>> GO TO 4.
NG
>> Replace front air control. Refer to MTC-94, "Removal and Installation" .

4. CHECK AIR MIX DOOR MOTOR (FRONT) CIRCUITS FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 3 and terminal 4.
Continuity should exist.

OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
WJIA1738E

5. CHECK AIR MIX DOOR MOTOR (FRONT) CIRCUITS FOR OPEN
1.
2.

Disconnect the air mix door motor (front) harness connector.
Check continuity between front air control harness connector
M49 (A) terminal 3, 4 and the air mix door motor (front) harness
connector M147 (B) terminal 1, 6.
3-1
4-6

: Continuity should exist.
: Continuity should exist.

OK or NG
OK
>> Replace air mix door motor (front). Refer to MTC-106,
"Removal and Installation" .
NG
>> Repair or replace harness as necessary.
Revision: August 2006

MTC-54

WJIA1934E

2007 Titan

TROUBLE DIAGNOSIS

6. CHECK FRONT AIR CONTROL FOR PBR POWER AND GROUND
1.
2.
3.

Reconnect front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 2 and terminal 15.
Connector
Front air control: M49

Terminals
(+)

(-)

Voltage
(Approx.)

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.

WJIA1729E

7. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and ground.

Continuity should not exist.
OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

WJIA1730E

8. CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1.
2.
3.

MTC

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and terminal 15.

Continuity should exist.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 9.

WJIA1731E

9. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1.
2.

Disconnect the air mix door motor (front) harness connector.
Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 3, 2 and front air control harness
connector M49 (A) terminal 2, 15.
2-3
15 - 2

: Continuity should exist.
: Continuity should exist.

OK or NG
OK
>> Replace air mix door motor (front). Refer to MTC-106,
"Removal and Installation" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-55

WJIA1777E

2007 Titan

TROUBLE DIAGNOSIS

10. CHECK PBR FEEDBACK VOLTAGE
1.
2.
3.

Reconnect the front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 18 and ground while rotating temperature control dial
from maximum heat to maximum cold.
Voltage

: Approx. .5V - 4.5V

OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.
LJIA0041E

11. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 18 and ground.
Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

WJIA1739E

12. CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the air mix door motor (front) harness connector and
front air control harness connector.
Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 4 and front air control harness connector M49 (A) terminal 18.
Continuity should exist.

OK or NG
OK
>> Replace air mix door motor (front). Refer to MTC-106,
"Removal and Installation" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-56

WJIA2280E

2007 Titan

TROUBLE DIAGNOSIS
Intake Door Motor Circuit

EJS003U8

SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (

)

1. Turn mode dial to vent mode ( ).
2. Press REC (
) switch.
3. Press REC (
) switch again.
4. Listen for intake door position change (you should hear blower sound change slightly).
Can a symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to MTC-43, "Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

>> GO TO 4.

4. CHECK INTAKE DOOR OPERATION

MTC

Check and verify intake door mechanism for smooth operation.
OK or NG
OK
>> GO TO 5.
NG
>> Repair intake door mechanism.

5. RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .

Revision: August 2006

MTC-57

2007 Titan

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Front air control
●
Intake door motor

System Operation
The intake door control determines the intake door positions based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.

Intake Doors Control Specification

WJIA0436E

COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.

WJIA0552E

Revision: August 2006

MTC-58

2007 Titan

TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
A

1. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1.
2.

Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 7 and terminal 8 while placing the HVAC system into
the front air control motor drive test.
NOTE:
To enter the front air control motor drive test, press and hold all
three HVAC control buttons for three seconds until all the lights
come on. Then press the REC (
) button.

Connector

Terminals
(+)

(-)

Front air control:
M49

Condition

Voltage
(Approx.)

Front air control
motor drive test

Battery
voltage

WJIA1757E

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.

2. CHECK INTAKE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 7, 8 and ground.
7 - Ground
8 - Ground

: Continuity should not exist.
: Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

MTC

WJIA1758E

3. CHECK FRONT AIR CONTROL FOR GROUND AND POWER
1.
2.

Turn ignition switch OFF.
Check voltage between front air control harness connector M49
terminal 7 and terminal 8 while placing the HVAC system into
front air control motor drive test.
Terminals

Connector
Front air control:
M49

(+)

(-)

Condition

Voltage
(Approx.)

Front air control
motor drive test

Battery
voltage

OK or NG
OK
>> GO TO 4.
NG
>> Replace front air control. Refer to MTC-94, "Removal and Installation" .

Revision: August 2006

MTC-59

WJIA1759E

2007 Titan

TROUBLE DIAGNOSIS

4. CHECK INTAKE DOOR MOTOR AND CIRCUITS FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 7 and terminal 8.
Continuity should exist.

OK or NG
OK
>> Replace intake door motor. Refer to ATC-176, "INTAKE
DOOR MOTOR" .
NG
>> GO TO 5.
WJIA1760E

5. CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN
1.
2.

Disconnect the intake door motor harness connector.
Check continuity between front air control harness connector
M49 terminal 7, 8 and the intake door motor harness connector
terminal 1, 6.
1-7

: Continuity should exist.

6-8

: Continuity should exist.

OK or NG
OK
>> Replace intake door motor. Refer to ATC-176, "INTAKE
DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-60

WJIA0591E

2007 Titan

TROUBLE DIAGNOSIS
Defroster Door Motor Circuit

EJS003U9

SYMPTOM:
●
●

Defroster door does not change.
Defroster door motor does not operate normally.
B

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DEFROSTER DOOR
C

1. Rotate mode dial to the vent position ( ).
2. Rotate mode dial to the defrost position (
).
3. Listen for defroster door position change (blower sound should change slightly).
Can the symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. CHECK FOR ANY SYMPTOMS
F

Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> GO TO 6.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
I

>> GO TO 4.

4. CHECK DEFROSTER DOOR OPERATION
MTC

Check and verify defroster door mechanism for smooth operation.
OK or NG
OK
>> GO TO 5.
NG
>> Repair defroster door mechanism.

5. RECHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .

Revision: August 2006

MTC-61

2007 Titan

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Defroster door control system components are:
●
Front air control
●
Defroster door motor
●
PBR (built into defroster door motor)

System Operation
The front air control determines defroster door position based on the position of the mode switch. When the
mode switch is in the defroster position, the defroster door motor rotates directing air to the defroster ducts.
When any mode other than defroster is selected, the defroster motor rotates in the opposite direction closing
off air flow to the defroster ducts.

COMPONENT DESCRIPTION
Defroster door motor
The defroster door motor is attached to the front heater & cooling
unit assembly. The front air control sends a voltage to rotate the
defroster door directing the air flow either to the defroster ducts, or to
the floor ducts, depending on which way the voltage and ground are
applied to the motor leads. Motor rotation is conveyed to a lever
which activates the defroster door.

WJIA0592E

DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR

1. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1.
2.
3.

Turn ignition switch ON.
Rotate mode dial to the defroster (
) position.
Check voltage between front air control harness connector M49
terminal 20 and terminal 19 and rotate mode dial to the defroster
(
) position again.
Terminals

Connector
Front air control:
M49

(+)

(-)

Condition

Voltage
(Approx.)

Rotate
defroster
dial

Battery
voltage

WJIA1765E

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.

Revision: August 2006

MTC-62

2007 Titan

TROUBLE DIAGNOSIS

2. CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 19, 20 and ground.
19 - Ground

: Continuity should not exist.

20 - Ground

: Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "Removal
and Installation" .
NG
>> Repair or replace harness as necessary.

D
WJIA1766E

3. CHECK FRONT AIR CONTROL FOR GROUND AND POWER
1.
2.

Rotate the mode dial to the defroster (
) position.
Check voltage between front air control harness connector M49
terminal 19 and terminal 20 and rotate the mode dial to defroster
(
) position.

G
Terminals
Connector
Front air control:
M49

(+)

(-)

Condition

Voltage
(Approx.)

Rotatemode dial

Battery
voltage

OK or NG
OK
>> GO TO 4.
NG
>> Replace front air control. Refer to MTC-94, "Removal and Installation" .

WJIA1767E

4. CHECK DEFROSTER DOOR MOTOR AND CIRCUITS FOR OPEN
1.
2.
3.

MTC

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 19 and terminal 20.

Continuity should exist.
OK or NG6
OK
>> GO TO 6.
NG
>> GO TO 5.

M
WJIA1773E

5. CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN
1.
2.

Disconnect the defroster door motor harness connector.
Check continuity between front air control harness connector
M49 terminal 19, 20 and the defroster door motor harness connector terminal 1, 6.
19 - 1

: Continuity should exist.

20 - 6

: Continuity should exist.

OK or NG
OK
>> Replace defroster door motor. Refer to ATC-175,
"DEFROSTER DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-63

WJIA0553E

2007 Titan

TROUBLE DIAGNOSIS

6. CHECK FRONT AIR CONTROL FOR PBR POWER AND GROUND
1.
2.
3.

Reconnect front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 2 and terminal 15.
Connector
Front air control: M49

Terminals
(+)

(-)

Voltage
(Approx.)

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.

WJIA1729E

7. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and ground.
Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to
"REMOVAL" .
NG
>> Repair or replace harness as necessary.

ATC-163,
WJIA1730E

8. CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1.
2.
3.

Turn ignition switch OFF.
Disconnect the front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 2 and terminal 15.
Continuity should exist.

OK or NG
OK
>> GO TO 10.
NG
>> GO TO 9.
WJIA1731E

9. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1.
2.

Disconnect the defroster door motor harness connector.
Check continuity between defroster door motor harness connector M144 (B) terminal 3, 2 and front air control harness connector M49 (A) terminal 2, 15.
2-3
15 - 2

: Continuity should exist.
: Continuity should exist.

OK or NG
OK
>> Replace defroster door motor. Refer to ATC-175,
"DEFROSTER DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-64

WJIA1777E

2007 Titan

TROUBLE DIAGNOSIS

10. CHECK PBR FEEDBACK VOLTAGE
1.
2.
3.

Reconnect the front air control harness connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 25 and ground while cycling defroster switch on and off.
Voltage

: Approx. 1V - 4.5V

OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.

D
WJIA1786E

11. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control harness connector.
Check continuity between front air control harness connector
M49 terminal 25 and ground.

Continuity should not exist.

OK or NG
OK
>> Replace front air control. Refer to
"REMOVAL" .
NG
>> Repair or replace harness as necessary.

ATC-163,

H
WJIA1787E

12. CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1.
2.
3.

Turn ignition switch OFF.
Disconnect the defroster door motor harness connector and
front air control harness connector.
Check continuity between defroster door motor harness connector M144 terminal 4 and front air control harness connector M49
terminal 25

MTC

Continuity should exist.
OK or NG
OK
>> Replace defroster door motor. Refer to ATC-175,
"DEFROSTER DOOR MOTOR" .
NG
>> Repair or replace harness as necessary.

Revision: August 2006

MTC-65

L
WJIA0558E

2007 Titan

TROUBLE DIAGNOSIS
Front Blower Motor Circuit

EJS003UA

SYMPTOM:
●
Blower motor operation is malfunctioning.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1.
2.

Rotate the blower control dial clockwise. Blower should operate.
Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
Can the symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.

4. CHECK BLOWER MOTOR OPERATION
Check and verify blower motor operates in all speeds.
Does blower motor operate in all speeds?
YES >> GO TO 5.
NO
>> Refer to MTC-68, "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR" .

Revision: August 2006

MTC-66

2007 Titan

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
●
●
●
●
●

Front air control
Front blower switch
Variable blower control
Front blower motor
Front blower motor relay

System Operation
D

I
WJIA1385E

COMPONENT DESCRIPTION
Variable Blower Control

MTC

The variable blower control is located on the heater and cooling unit
assembly. The variable blower control receives a gate voltage from
the front air control to steplessly maintain the blower motor voltage in
the 0 to 5 volt range (approx.).

M
WJIA0559E

Revision: August 2006

MTC-67

2007 Titan

TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.

WJIA1574E

1. CHECK FUSES
Check 20A fuses No. 24 and 27, (located in the fuse and fusible link box). For fuse layout. Refer to PG-80,
"FUSE AND FUSIBLE LINK BOX" .
Fuses are good.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 10.

2. CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1.
2.
3.
4.
5.
6.

Turn ignition switch OFF.
Disconnect front blower motor connector.
Turn ignition switch ON.
Turn the mode dial to select any mode except off.
Turn the front blower control dial to high.
Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
2 - Ground

: Battery voltage

OK or NG
OK
>> GO TO 12.
NG
>> GO TO 3.

Revision: August 2006

WJIA1331E

MTC-68

2007 Titan

TROUBLE DIAGNOSIS

3. CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1.
2.
3.
4.

Turn ignition switch OFF.
Disconnect front blower motor relay.
Turn ignition switch ON.
Check voltage between front blower motor relay harness connector M107 terminals 5 and ground.
5 - Ground

: Battery voltage

OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector as necessary.

D
WJIA1359E

4. CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.
Refer to MTC-72, "Front Blower Motor Relay" .
OK or NG
OK
>> GO TO 5.
NG
>> Replace front blower motor relay.

5. CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connector M107 terminal 3 and front blower motor harness connector M62
terminal 2.
3-2

: Continuity should exist.

OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector as necessary.

MTC

WJIA1360E

6. CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1.
2.

Disconnect variable blower control harness connector.
Check continuity between front blower motor relay harness connector M107 terminals 3 and variable blower control harness
connector M122 terminal 1.
3-1

: Continuity should exist.

OK or NG
OK
>> GO TO 7.
NG
>> Repair harness or connector as necessary.
WJIA1361E

Revision: August 2006

MTC-69

2007 Titan

TROUBLE DIAGNOSIS

7. CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1.
2.

Disconnect front air control connector.
Check continuity between front air control harness connector
M49 terminal 40 and variable blower control harness connector
M122 terminal 2.
40 - 2

: Continuity should exist.

OK or NG
OK
>> GO TO 8.
NG
>> Repair harness or connector as necessary.
WJIA1387E

8. CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1.
2.

Turn ignition switch ON.
Check voltage between front blower motor relay harness connector M107 terminal 2 and ground.
2 - Ground

: Battery voltage

OK or NG
OK
>> GO TO 9.
NG
>> Repair harness or connector as necessary.

WJIA1363E

9. CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
1.
2.

Turn ignition switch OFF.
Check continuity between front blower motor relay connector
M107 terminal 1 and front air control harness connector M49 terminal 26.
1 - 26

: Continuity should exist.

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "CONTROL
UNIT" .
NG
>> Repair harness or connector as necessary.
WJIA1364E

10. REPLACE FUSES
1. Replace fuses.
2. Activate the front blower motor.
3. Do fuses blow?
YES or NO
YES >> GO TO 11.
NO
>> Inspection End.

Revision: August 2006

MTC-70

2007 Titan

TROUBLE DIAGNOSIS

11. CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1.
2.
3.

Turn ignition switch OFF.
Disconnect front blower motor connector and variable blower
control connector.
Check continuity between variable blower control harness connector M122 terminal 1 and ground.
1 - Ground.

: Continuity should not exist.

OK or NG
OK
>> GO TO 12.
NG
>> Repair harness or connector as necessary.

D
WJIA1365E

12. CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1.
2.

Disconnect front air control connector.
Check continuity between front air control harness connector
M49 terminal 40 and variable blower control harness connector
M122 terminal 2.
40 - 2

: Continuity should exist.

OK or NG
OK
>> GO TO 13.
NG
>> Repair harness or connector as necessary.

H
WJIA1387E

13. CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to MTC-66, "Front Blower Motor Circuit" .
OK or NG
OK
>> GO TO 14.
NG
>> Replace front blower motor. Refer to MTC-96, "BLOWER MOTOR" .

MTC

14. CHECK BLOWER MOTOR GROUND CIRCUIT
Check continuity between front blower motor harness connector
M62 terminal 1 and variable blower control harness connector M122
terminal 3.
1-3

: Continuity should exist.

OK or NG
OK
>> GO TO 15.
NG
>> Repair harness or connector as necessary.

WJIA1367E

Revision: August 2006

MTC-71

2007 Titan

TROUBLE DIAGNOSIS

15. CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
Check continuity between variable blower control harness connector
M122 terminal 4 and ground.
4 - ground

: Continuity should exist.

OK or NG
OK
>> Replace variable blower control. Refer to MTC-107,
"VARIABLE BLOWER CONTROL" .
NG
>> Repair harness or connector as necessary.

WJIA1368E

COMPONENT INSPECTION
Front Blower Motor Relay
Check continuity between terminals 3 and 5 by supplying 12 volts
and ground to coil side terminals of relay.

WJIA1401E

Front Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
●
Apply 12 volts to terminal 2 and ground to terminal 1 and verify
that the motor operates freely and quietly.

WJIA1508E

Revision: August 2006

MTC-72

2007 Titan

TROUBLE DIAGNOSIS
Magnet Clutch Circuit

EJS003UD

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Rotate blower control dial clockwise. Rotate mode dial to vent ( ) position.
2. Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection).
Can the symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. CHECK FOR ANY SYMPTOMS
E

Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
H

>> GO TO 4.

4. CHECK INTAKE SENSOR
I

Check and verify intake sensor circuit. Refer to MTC-92, "Intake Sensor Circuit" .
>> GO TO 5.

MTC

Revision: August 2006

MTC-73

2007 Titan

TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.

Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sensor.
When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

WJIA1392E

1. CHECK INTAKE SENSOR CIRCUITS
Check intake sensor. Refer to MTC-92, "Intake Sensor Circuit" .
OK or NG
OK
>> GO TO 2.
NG
>> Replace intake sensor. Refer to MTC-95, "INTAKE SENSOR" .

2. PERFORM AUTO ACTIVE TEST
Refer to PG-22, "Auto Active Test" .
Does magnet clutch operate?
YES or NO
YES >> ●
WITH CONSULT-II
GO TO 5.
WITHOUT CONSULT-II
GO TO 6.
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
●

Revision: August 2006

MTC-74

2007 Titan

TROUBLE DIAGNOSIS

3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1.
2.
3.

Turn ignition switch OFF.
Disconnect IPDM E/R connector and A/C compressor (magnet
clutch) connector.
Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.
11 – 1

: Continuity should exist.

OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector as necessary.

D
WJIA0560E

4. CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage to terminal
1 of A/C compressor.
OK or NG
OK
>> Replace IPDM E/R. Refer to PG-30, "Removal and
Installation of IPDM E/R" .
NG
>> Replace magnet clutch. Refer to MTC-115, "Removal
and Installation for Compressor Clutch" .

H
WJIA1452E

5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to MTC-30, "CONSULT-II
Function (BCM)" .
A/C SW ON

: COMP ON SIG ON

A/C SW OFF

: COMP ON SIG OFF

MTC

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.

WJIA0469E

6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1.
2.
3.

Turn ignition switch OFF.
Disconnect BCM connector and front air control connector.
Check continuity between BCM harness connector M18 terminal
27 and front air control harness connector M49 terminal 12.
27 - 12

Continuity should exist.

OK or NG
OK
>> GO TO 7.
NG
>> Repair harness or connector as necessary.
WJIA1443E

Revision: August 2006

MTC-75

2007 Titan

TROUBLE DIAGNOSIS

7. CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL)
1.
2.
3.

Reconnect BCM connector and front air control connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 12 and ground.
Terminals
(+)

Front air
control connector

(-)

Terminal No.

Condition

Voltage

A/C switch: ON

Approx. 0V

A/C switch: OFF

Approx. 5V

WJIA0449E

M49

Ground

OK or NG
OK
>> GO TO 8.
NG-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to MTC-94,
"CONTROL UNIT" .
NG-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to BCS-26, "REMOVAL
AND INSTALLATION" .

8. CHECK REFRIGERANT PRESSURE SENSOR
1.
2.
1.
2.

WITH CONSULT-II
Start engine.
Check voltage of refrigerant pressure sensor. Refer to MTC-29, "CONSULT-II Function (HVAC)" .
WITHOUT CONSULT-II
Start engine.
Check voltage between ECM harness connector F54 terminal
70 and ground.
Terminals
(+)
ECM connector

Terminal No.

F54

OK or NG
OK
>> ●

Condition

Voltage

A/C switch: ON

Approx. 0.36 - 3.88V

(-)
Ground

WITH CONSULT-II
GO TO 9.

LJIA0124E

WITHOUT CONSULT-II
GO TO 10.
>> Refer to EC-678, "REFRIGERANT PRESSURE SENSOR" .
●

Revision: August 2006

MTC-76

2007 Titan

TROUBLE DIAGNOSIS

9. CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to MTC-30, "CONSULT-II Function (BCM)" .
FRONT BLOWER CONTROL
DIAL ON
FRONT BLOWER CONTROL
DIAL OFF

: FAN ON SIG ON
: FAN ON SIG OFF

OK or NG
OK
>> GO TO 12.
NG
>> GO TO 10.

D
WJIA0469E

10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1.
2.
3.

Turn ignition switch OFF.
Disconnect BCM connector and front air control connector.
Check continuity between BCM harness connector M18 terminal
28 and front air control harness connector M50 terminal 36.
28 - 36

: Continuity should exist.

OK or NG
OK
>> GO TO 11.
NG
>> Repair harness or connector as necessary.

H
WJIA1393E

11. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
1.
2.
3.

Reconnect BCM connector and front air control connector.
Turn ignition switch ON.
Check voltage between front air control harness connector M49
terminal 36 and ground.

MTC

K
Terminals
(+)
Front air control connector

M50

Terminal No.

(-)

Ground

Condition

Voltage

L
A/C switch: ON
Blower motor
operates

Approx. 0V

A/C switch: OFF

Approx. 5V

WJIA1394E

OK or NG
OK
>> GO TO 12.
NG-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to MTC-94,
"CONTROL UNIT" .
NG-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to BCS-26,
"REMOVAL AND INSTALLATION" .

Revision: August 2006

MTC-77

2007 Titan

TROUBLE DIAGNOSIS

12. CHECK CAN COMMUNICATION
Check CAN communication. Refer to LAN-2, "SYSTEM DESCRIPTION" .
●
BCM – ECM
●
ECM – IPDM E/R
●
ECM – Front air control
OK or NG
OK
>> Inspection End.
NG
>> Repair or replace malfunctioning part(s).

Revision: August 2006

MTC-78

2007 Titan

TROUBLE DIAGNOSIS
Insufficient Cooling

EJS003UE

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to maximum cold.
2. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO
>> GO TO 2.

2. CHECK FOR ANY SYMPTOMS
E

Perform a complete operational check for any symptoms. Refer to MTC-43, "Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-30, "SYMPTOM TABLE" .
NO
>> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
H

>> GO TO 4.

4. CHECK DRIVE BELTS
I

Check compressor belt tension. Refer to EM-13, "Checking Drive Belts" .
OK or NG
OK
>> GO TO 5.
NG
>> Adjust or replace compressor belt. Refer to EM-13, "DRIVE BELTS" .

MTC

5. CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES >> GO TO 6.
NO
>> Repair or replace air mix door control linkage.

6. CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to EC-502, "Description" .
Does cooling fan motor operate correctly?
YES >> GO TO 7.
NO
>> Check cooling fan motor. Refer to EC-502, "DTC P1217 ENGINE OVER TEMPERATURE" .

7. CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/
recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.
>> GO TO 8.

Revision: August 2006

MTC-79

2007 Titan

TROUBLE DIAGNOSIS

8. CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
OK or NG
OK
>> GO TO 9.
NG
>> Check contaminated refrigerant. Refer to MTC-4, "Contaminated Refrigerant" .

9. CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to MTC-81, "PERFORMANCE TEST DIAGNOSES" .
NO
>> GO TO 10.

10. CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to MTC-83, "Test Reading" .
OK or NG
OK
>> Perform performance test diagnoses. Refer to MTC-81, "PERFORMANCE TEST DIAGNOSES" .
NG
>> GO TO 11.

11. CHECK AIR DUCTS
Check ducts for air leaks.
OK or NG
OK
>> System OK.
NG
>> Repair air leaks.

Revision: August 2006

MTC-80

2007 Titan

TROUBLE DIAGNOSIS
PERFORMANCE TEST DIAGNOSES
A

MTC

WJIA0533E

MTC-83, "PERFORMANCE CHART" *2

MTC-52, "Air Mix Door Motor Circuit"

Revision: August 2006

MTC-83, "Test Reading"

MTC-81

MTC-84, "Trouble Diagnoses for
Unusual Pressure"

2007 Titan

TROUBLE DIAGNOSIS

WJIA1371E

MTC-115, "Removal and Installation
for Compressor Clutch"

Revision: August 2006

MTC-66, "Front Blower Motor Circuit"

MTC-82

EM-13, "Checking Drive Belts"

2007 Titan

TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition

Testing must be performed as follows:
Vehicle location

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door window

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

(Ventilation) set

Recirculation (REC) switch

(Recirculation) set
Max. speed set

Blower speed
Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Test Reading

Recirculating-to-discharge Air Temperature Table
Inside air (Recirculating air) at blower assembly inlet
Relative humidity
%

Discharge air temperature at center ventilator
°C (°F)

Air temperature
°C (°F)
20 (68)

9.9 - 13.9 (50 - 57)

25 (77)

14.6 - 18.6 (58 - 65)

30 (86)

16.8 - 21.8 (62 - 71)

35 (95)

21.1 - 27.1 (70 - 81)

40 (104)

25.3 - 31.5 (78 - 89)

50 - 60

20 (68)

11.4 - 15.2 (53 - 59)

25 (77)

15.5 - 20.0 (60 - 68)

30 (86)

19.9 - 25.0 (68 - 77)

35 (95)

24.5 - 29.6 (76 - 85)

40 (104)

28.7 - 34.9 (84 - 95)

60 - 70

MTC

Ambient Air Temperature-to-operating Pressure Table
Ambient air
Relative humidity
%

50 - 70

Revision: August 2006

High-pressure (Discharge side)

Low-pressure (Suction side)

Air temperature
°C (°F)

kPa (kg/cm2 , psi)

20 (68)

1020 - 1250
(10.4 - 12.7, 147.9 - 181.3)

160 - 190
(1.63 - 1.94, 23.2 - 27.6)

25 (77)

1236 - 1510
(12.6 - 15.4, 179.2 - 219)

206 - 245
(2.1 - 2.5, 29.9 - 35.6)

30 (86)

1569 - 1,922
(16.0 - 19.6, 227.6 - 278.8)

265 - 324
(2.7 - 3.3, 38.4 - 46.9)

35 (95)

1,697 - 2079
(17.3 - 21.2, 246.1 - 301.5)

304 - 363
(3.1 - 3.7, 44.1 - 52.6)

40 (104)

1971 - 2403
(20.1 - 24.5, 285.9 - 348.5)

373 - 451
(3.8 - 4.6, 54.0 - 65.4)

MTC-83

2007 Titan

TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system′s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperatureto-operating pressure table).

Both High- and Low-pressure Sides are Too High
Gauge indication

Refrigerant cycle
Pressure is reduced soon
after water is splashed on
condenser.

Air suction by cooling fan is
insufficient.

Probable cause
Excessive refrigerant charge
in refrigeration cycle
Insufficient condenser cooling
performance
↓
1. Condenser fins are clogged.

Corrective action
Reduce refrigerant until specified pressure is obtained.

●

Clean condenser.

●

Check and repair cooling fan
if necessary.

2. Improper fan rotation of
cooling fan
Both high- and low-pressure sides
are too high.

●

Low-pressure pipe is not
cold.

●

When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm2 , 28 psi). It then
decreases gradually thereafter.

AC359A

Engine tends to overheat.

●

An area of the low-pressure pipe is colder than
areas near the evaporator
outlet.
Plates are sometimes covered with frost.

Poor heat exchange in condenser
(After compressor operation
stops, high-pressure
decreases too slowly.)
↓
Air in refrigeration cycle

Evacuate and recharge system.

Engine cooling systems malfunction.

Check and repair engine cooling system.

●

Excessive liquid refrigerant
on low-pressure side

●

Excessive refrigerant discharge flow

●

Expansion valve is open a
little compared with the
specification.

Replace expansion valve.

↓
Improper expansion valve
adjustment

High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.

High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.

●

Check and repair or replace
malfunctioning parts.

●

Check oil for contamination.

AC360A

Revision: August 2006

MTC-84

2007 Titan

TROUBLE DIAGNOSIS
High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication
High-pressure side is too low and
low-pressure side is too high.

Refrigerant cycle

Probable cause

High- and low-pressure sides
become equal soon after compressor operation stops.

Compressor pressure operation is improper.
↓
Damaged inside compressor
packings.

No temperature difference
between high- and low-pressure sides.

Compressor pressure operation is improper.
↓
Damaged inside compressor
packings.

AC356A

Corrective action

Replace compressor.

C
Replace compressor.

Both High- and Low-pressure Sides are Too Low
Gauge indication

Refrigerant cycle
●

●

Both high- and low-pressure sides
are too low.

AC353A

There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.

Probable cause

Liquid tank inside is slightly
clogged.

Corrective action

●

Replace liquid tank.

●

Check oil for contamination.

Liquid tank inlet and expansion valve are frosted.
Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.

●

Expansion valve inlet may
be frosted.

●

Temperature difference
occurs somewhere in highpressure side.

Expansion valve and liquid
tank are warm or only cool
when touched.

There is a big temperature difference between expansion
valve inlet and outlet while the
valve itself is frosted.

Air flow volume is too low.

Revision: August 2006

High-pressure pipe located
between liquid tank and
expansion valve is clogged.

Low refrigerant charge.
↓
Leaking fittings or components.
Expansion valve closes a little
compared with the specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.

●

Check and repair malfunctioning parts.

●

Check oil for contamination.

Check refrigerant system for
leaks. Refer to MTC-122,
"Checking for Refrigerant
Leaks" .

●

Remove foreign particles by
using compressed air.

●

Check oil for contamination.

●

Check and repair malfunctioning parts.

●

Check oil for contamination.

●

Check intake sensor circuit.
Refer to MTC-92, "Intake
Sensor Circuit" .

●

Repair evaporator fins.

●

Replace evaporator.

●

Refer to MTC-66, "Front
Blower Motor Circuit" .

3. Outlet and inlet may be
clogged.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.

Low-pressure pipe is clogged
or crushed.

Evaporator is frozen.

MTC-85

2007 Titan

MTC

TROUBLE DIAGNOSIS
Low-pressure Side Sometimes Becomes Negative
Gauge indication
Low-pressure side sometimes
becomes negative.

Refrigerant cycle
●

●

Air conditioning system
does not function and does
not cyclically cool the compartment air.
The system constantly functions for a certain period of
time after compressor is
stopped and restarted.

Probable cause
Refrigerant does not discharge cyclically.
↓
Moisture is frozen at expansion valve outlet and inlet.
↓
Water is mixed with refrigerant.

Corrective action

●

Drain water from refrigerant
or replace refrigerant.

●

Replace liquid tank.

AC354A

Low-pressure Side Becomes Negative
Gauge indication

Refrigerant cycle

Probable cause

Corrective action
Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
●

If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrigerant.

●

If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).

●

If either of the above methods cannot correct the malfunction, replace expansion
valve.

●

Replace liquid tank.

●

Check oil for contamination.

Low-pressure side becomes negative.
Liquid tank or front/rear side of
expansion valve′s pipe is
frosted or dewed.

High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.

AC362A

Revision: August 2006

MTC-86

2007 Titan

TROUBLE DIAGNOSIS
Insufficient Heating

EJS003UF

SYMPTOM: Insufficient heating

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Rotate blower control dial clockwise.
2. Turn the temperature control dial clockwise to the maximum heat.
3. Check for hot air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 2.
NO
>> Perform complete operational check (front). Refer to MTC-43, "Operational Check" .

2. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
F

>> GO TO 3.

3. CHECK ENGINE COOLING SYSTEM
1.
2.
3.
4.

Check for proper engine coolant level. Refer to CO-10, "LEVEL CHECK" .
Check hoses for leaks or kinks.
Check radiator cap. Refer to CO-10, "CHECKING RADIATOR CAP" .
Check for air in cooling system.

>> GO TO 4.

4. CHECK AIR MIX DOOR OPERATION

MTC

Check the operation of the air mix door.
OK or NG
OK
>> GO TO 5.
NG
>> Check the air mix door motor circuit. Refer to MTC-52, "Air Mix Door Motor Circuit" .

5. CHECK AIR DUCTS

Check for disconnected or leaking air ducts.
OK or NG
OK
>> GO TO 6.
NG
>> Repair all disconnected or leaking air ducts.

6. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
OK or NG
OK
>> Hot inlet hose and a warm outlet hose: GO TO 7.
NG
>> Both hoses warm: GO TO 8.

7. CHECK ENGINE COOLANT SYSTEM
Check engine coolant temperature sensor. Refer to EC-217, "DTC P0117, P0118 ECT SENSOR" .
OK or NG
OK
>> System OK.
NG
>> Repair or replace as necessary. Retest.
Revision: August 2006

MTC-87

2007 Titan

TROUBLE DIAGNOSIS

8. CHECK HEATER HOSES
Check heater hoses for proper installation.
OK or NG
OK
>> System OK.
NG
>> 1. Back flush heater core.
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-10, "Changing Engine Coolant" .
4. GO TO 9 to retest.

9. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
OK or NG
OK
>> System OK.
NG
>> Replace heater core. Refer to MTC-101, "HEATER CORE" .

Revision: August 2006

MTC-88

2007 Titan

TROUBLE DIAGNOSIS
Noise

EJS003UG

SYMPTOM: Noise

INSPECTION FLOW
B

MTC

WJIA1972E

MTC-115, "Removal and Installation
for Compressor Clutch".

MTC-116, "Clutch Disc".

MTC-43, "Operational Check".

EM-13, "Checking Drive Belts".

Revision: August 2006

MTC-89

MTC-20, "Maintenance of Oil Quantity in Compressor".

2007 Titan

TROUBLE DIAGNOSIS
Water Valve Circuit

EJS003UI

COMPONENT DESCRIPTION
Water Valve
⇐:Front
The water valve (1) cuts the flow of engine coolant to the heater core
to allow for maximum cooling during A/C operation. It is controlled by
the front air control.

WJIA1791E

DIAGNOSTIC PROCEDURE FOR WATER VALVE

1. CHECK WATER VALVE POWER AND GROUND CIRCUITS
1.
2.
3.
4.
5.

Disconnect water valve connector F68.
Turn ignition switch ON.
Rotate mode dial to MAX A/C.
Rotate temperature control dial to maximum heat.
Check voltage between water valve harness connector F68 terminal 1 and terminal 2 while rotating temperature control dial to
maximum cold.
Connector

Water valve: F68

Terminals
(+)
1

(-)
2

Condition

Voltage
(Approx.)

Rotate temperature
control dial

Battery
voltage

WJIA1792E

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.

2. CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control connector M50.
Check continuity between water valve harness connector F68
(A) terminal 1 and front air control harness connector M50 (B)
terminal 29.
1 - 29

: Continuity should exist.

Check continuity between water valve harness connector F68
(A) terminal 1 and ground.
1 - Ground

: Continuity should not exist.

WJIA1793E

OK or NG
OK
>> Replace front air control. Refer to ATC-163, "REMOVAL" .
NG
>> Repair harness or connector.

Revision: August 2006

MTC-90

2007 Titan

TROUBLE DIAGNOSIS

3. CHECK WATER VALVE POWER AND GROUND CIRCUITS
1.
2.

Rotate temperature control dial to maximum cold.
Check voltage between water valve harness connector F68 terminal 1 and terminal 2 while rotating temperature control dial to
maximum heat.
Terminals
Connector

Water valve: F68

(+)

(-)

Condition

Voltage
(Approx.)

Rotate temperature
control dial

Battery
voltage

OK or NG
OK
>> Replace the water valve.
NG
>> GO TO 4.

D
WJIA1794E

4. CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1.
2.
3.

2 - 30
4.

Turn ignition switch OFF.
Disconnect front air control connector M50.
Check continuity between water valve harness connector F68
(A) terminal 2 and front air control harness connector M50 (B)
terminal 30.

: Continuity should exist.

Check continuity between water valve harness connector F68
(A) terminal 2 and ground.
2 - Ground

: Continuity should not exist.

WJIA1796E

OK or NG
OK
>> Replace front air control. Refer to ATC-163, "REMOVAL" .
NG
>> Repair harness or connector.

MTC

Revision: August 2006

MTC-91

2007 Titan

TROUBLE DIAGNOSIS
Intake Sensor Circuit

EJS003UJ

COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on top of the heater and cooling unit
assembly next to the A/C evaporator cover. It converts temperature
of air after it passes through the evaporator into a resistance value
which is then input to the front air control.

WJIA0571E

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. Using the CONSULT-II, DTC B2581 or B2582 is displayed.

WJIA0464E

1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1.
2.
3.

Disconnect intake sensor connector.
Turn ignition switch ON.
Check voltage between intake sensor harness connector M146
terminal 2 and ground.
2 - Ground

: Approx. 5V

OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
WJIA1375E

2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between intake sensor harness connector
M146 terminal 1 and front air control harness connector M49 terminal 21.
1 - 21

: Continuity should exist.

OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector as necessary.

Revision: August 2006

MTC-92

WJIA1376E

2007 Titan

TROUBLE DIAGNOSIS

3. CHECK INTAKE SENSOR

Check intake sensor. Refer to MTC-92, "Intake Sensor Circuit" .
OK or NG
OK
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .
NG
>> Replace intake sensor. Refer to MTC-95, "INTAKE SENSOR" .

4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1.
2.
3.

Turn ignition switch OFF.
Disconnect front air control connector.
Check continuity between intake sensor harness connector
M146 terminal 2 and front air control harness connector M49 terminal 9.
2-9

: Continuity should exist.

Check continuity between intake sensor harness connector
M146 terminal 2 and ground.
2 - Ground

: Continuity should not exist.

F
WJIA1377E

OK or NG
OK
>> Replace front air control. Refer to MTC-94, "CONTROL UNIT" .
NG
>> Repair harness or connector as necessary.

COMPONENT INSPECTION
Intake Sensor

After disconnecting intake sensor connector, measure resistance
between terminals 1 and 2 at sensor harness side, using the table
below.
Temperature °C (°F)

Resistance kΩ

−15 (5)

209.0

−10 (14)

160.0

−5 (23)

123.0

0 (32)

95.8

5 (41)

74.9

10 (50)

58.9

15 (59)

46.7

20 (68)

37.3

25 (77)

30.0

30 (86)

24.2

35 (95)

19.7

40 (104)

16.1

45 (113)

13.2

MTC

If NG, replace intake sensor. Refer to MTC-95, "INTAKE SENSOR" .

Revision: August 2006

MTC-93

WJIA1378E

2007 Titan

CONTROL UNIT
CONTROL UNIT
Removal and Installation

PFP:27500
EJS0032V

REMOVAL
1.
2.
3.
4.
5.

Remove the three control knobs from the front air control unit.
Remove the cluster lid C. Refer to IP-10, "Removal and Installation" .
Remove the four screws securing the front air control unit to the
cluster lid C.
Disconnect the two electrical connectors.
Remove the front air control unit.

LJIA0130E

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-94

2007 Titan

INTAKE SENSOR
INTAKE SENSOR
Removal and Installation

PFP:27723

A
EJS0032W

REMOVAL
1.
2.

Remove the instrument panel. Refer to IP-10, "Removal and Installation" .
Disconnect the intake sensor electrical connector.
NOTE:
The intake sensor is located on the top of the heater and cooling
unit assembly next to the A/C evaporator cover.
Twist the intake sensor to remove the intake sensor from the
heater and cooling unit assembly.

E
WJIA1349E

INSTALLATION

Installation is in the reverse order of removal.
G

MTC

Revision: August 2006

MTC-95

2007 Titan

BLOWER MOTOR
BLOWER MOTOR
Removal and Installation

PFP:27226
EJS0032X

Blower Motor - Heater and Cooling Unit Assembly

LJIA0136E

Heater and cooling unit assembly

Blower motor

Variable blower control

REMOVAL
1.
2.
3.

Remove the glove box assembly. Refer to IP-10, "Removal and Installation" .
Disconnect the blower motor electrical connector.
Remove the three screws and remove the blower motor.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-96

2007 Titan

IN-CABIN MICROFILTER
IN-CABIN MICROFILTER
Removal and Installation

PFP:27277

A
EJS0032Y

FUNCTION
The air inside the passenger compartment is filtered by the in-cabin
microfilters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two in-cabin microfilters are located
in the front heater and cooling unit assembly.

LJIA0012E

REPLACEMENT TIMING
Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving
conditions. Refer to MA-7, "PERIODIC MAINTENANCE" . It may also be necessary to replace the two incabin microfilters as part of a component replacement if the in-cabin microfilters are damaged.

REPLACEMENT PROCEDURE
1.

Remove the two lower glove box hinge pins to remove the glove
box from the instrument panel and let it hang from the cord.

MTC
WLIA0027E

2.
3.

Remove the screw and remove the in-cabin microfilter cover.
Remove the in-cabin microfilters from the front heater and cooling unit assembly housing.

M
LJIA0134E

Insert the first new in-cabin microfilter into the front heater and
cooling unit assembly housing and slide it over to the right.
Insert the second new in-cabin microfilter into the front heater
and cooling unit assembly housing.
NOTE:
The in-cabin microfilters are marked with air flow arrows. The
end of the microfilter with the arrow should face the rear of the
vehicle. The arrows should point downward.

LJIA0148E

Revision: August 2006

MTC-97

2007 Titan

IN-CABIN MICROFILTER
5.

Install the in-cabin microfilter cover.

LJIA0134E

Install the lower glove box in the instrument panel and secure it
with the two hinge pins.

WLIA0027E

Revision: August 2006

MTC-98

2007 Titan

HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
Removal and Installation

PFP:27110

A
EJS0032Z

MTC

WJIA0695E

High-pressure A/C pipe

Expansion valve

A/C drain hose

Heater and cooling unit assembly

Low-pressure A/C pipe

REMOVAL
1.
2.
3.
4.
5.
6.
7.

Discharge the refrigerant from the A/C system. Refer to MTC-111, "Discharging Refrigerant" .
Drain the coolant from the engine cooling system. Refer to MA-13, "DRAINING ENGINE COOLANT" .
Disconnect the heater hoses from the heater core.
Disconnect the high/low pressure pipes from the expansion valve.
Move the two front seats to the rearmost position on the seat track.
Disconnect the battery negative terminal and battery positive terminal.
Remove the instrument panel and console panel. Refer to IP-10, "Removal and Installation" .

Revision: August 2006

MTC-99

2007 Titan

HEATER & COOLING UNIT ASSEMBLY
8.
9.

Remove the steering column. Refer to PS-9, "Removal and Installation" .
Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse
block (J/B) electrical connectors. Refer to PG-40, "Harness Layout" .
10. Disconnect the steering member from each side of the vehicle body.
11. Remove the heater and cooling unit assembly with it attached to the steering member, from the vehicle.
CAUTION:
Use care not to damage the seats and interior trim panels when removing the heater and cooling
unit assembly with it attached to the steering member.
12. Remove the heater and cooling unit assembly from the steering member.

INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-rings of the low-pressure pipe and high-pressure pipe with new ones, then apply
compressor oil to them when installing them.
●
After charging the refrigerant, check for leaks.
NOTE:
●
Fill the engine cooling system with the specified coolant mixture. Refer to MA-11, "Fluids and Lubricants"
.
●
Recharge the A/C system. Refer to MTC-111, "Evacuating System and Charging Refrigerant" .

Revision: August 2006

MTC-100

2007 Titan

HEATER CORE
HEATER CORE
Removal and Installation

PFP:27140

A
EJS00330

Heater and Cooling Unit Assembly
B

MTC

LJIA0138E

Heater core cover

Heater core pipe bracket

Heater core

Upper bracket

Upper heater and cooling unit case

A/C evaporator

Lower heater and cooling unit case

Blower motor

Variable blower control

Revision: August 2006

MTC-101

2007 Titan

HEATER CORE
REMOVAL
1.
2.
3.
4.
5.

Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .
Remove the four screws and remove the upper bracket.
Remove the four screws and remove the heater core cover.
Remove the heater core pipe bracket.
Remove the heater core.
NOTE:
If the in-cabin microfilters are contaminated from coolant leaking
from the heater core, replace the in-cabin microfilters with new
ones before installing the new heater core.

LJIA0134E

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-102

2007 Titan

DEFROSTER DOOR MOTOR
DEFROSTER DOOR MOTOR
Removal and Installation

PFP:27733

A
EJS00331

Defroster Door Motor - Heater and Cooling Unit Assembly
B

MTC

M
WJIA0622E

Heater and cooling unit assembly

Intake door motor

Air mix door motor

Variable blower control

Mode door motor

Defroster door motor

REMOVAL
1.
2.
3.
4.

Remove the BCM. Refer to BCS-26, "BCM" .
Remove the audio amplifier, if equipped. Refer to AV-74, "AUDIO AMP." .
Disconnect the defroster door motor electrical connector.
Remove the three screws and remove the defroster door motor.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-103

2007 Titan

INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
Removal and Installation

PFP:27730
EJS00332

Intake Door Motor - Heater and Cooling Unit Assembly

WJIA0622E

Heater and cooling unit assembly

Intake door motor

Air mix door motor

Variable blower control

Mode door motor

Defroster door motor

REMOVAL
1.
2.
3.
4.

Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .
Remove the steering member from the heater and cooling unit assembly.
Disconnect the intake door motor electrical connector.
Remove the three screws and remove the intake door motor.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-104

2007 Titan

MODE DOOR MOTOR
MODE DOOR MOTOR
Removal and Installation

PFP:27731

A
EJS00333

Mode Door Motor - Heater and Cooling Unit Assembly
B

MTC

M
WJIA0622E

Heater and cooling unit assembly

Intake door motor

Air mix door motor

Variable blower control

Mode door motor

Defroster door motor

REMOVAL
1.
2.
3.

Remove the center console lower cover LH. Refer to IP-14, "CENTER CONSOLE" .
Disconnect the mode door motor electrical connector.
Remove the two screws and remove the mode door motor.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-105

2007 Titan

AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
Removal and Installation

PFP:27732
EJS00334

Air Mix Door Motor - Heater and Cooling Unit Assembly

WJIA0622E

Heater and cooling unit assembly

Intake door motor

Air mix door motor

Variable blower control

Mode door motor

Defroster door motor

REMOVAL
1.
2.
3.
4.

Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .
Remove the steering member from the heater and cooling unit assembly.
Disconnect the air mix door motor electrical connector.
Remove the three screws and remove the air mix door motor.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-106

2007 Titan

VARIABLE BLOWER CONTROL
VARIABLE BLOWER CONTROL
Removal and Installation

PFP:27200

A
EJS00335

Variable Blower Control - Heater and Cooling Unit Assembly
B

MTC

M
WJIA0622E

Heater and cooling unit assembly

Intake door motor

Air mix door motor

Variable blower control

Mode door motor

Defroster door motor

REMOVAL
1.
2.
3.

Remove the glove box assembly. Refer to IP-14, "LOWER INSTRUMENT PANEL RH AND GLOVE BOX"
.
Disconnect the variable blower control electrical connector.
Remove the two screws and remove the variable blower control.

INSTALLATION
Installation is in the reverse order of removal.

Revision: August 2006

MTC-107

2007 Titan

DUCTS AND GRILLES
DUCTS AND GRILLES
Removal and Installation

PFP:27860
EJS00336

Ducts - Heater and Cooling Unit Assembly

LJIA0141E

Revision: August 2006

MTC-108

2007 Titan

DUCTS AND GRILLES
1.

Defroster nozzle

LH side demister duct

LH ventilator duct

RH side demister duct

RH ventilator duct

Center ventilator duct

Heater and cooling unit assembly

Floor duct

Clips

Grilles

MTC
WJIA0696E

Instrument panel

Side ventilator assembly LH

Storage tray bottom cover (LH)

Cluster lid D ventilator LH

Cluster lid D ventilator RH

Side ventilator assembly RH

Storage tray bottom cover (RH)

DEFROSTER NOZZLE
Removal
1.
2.
3.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .
Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .
Remove the defroster nozzle.

Installation
Installation is in the reverse order of removal.

RH AND LH SIDE DEMISTER DUCT
Removal
1.
2.
3.

Installation
Installation is in the reverse order of removal.

RH AND LH VENTILATOR DUCT
Removal
1.
2.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .
Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .

Revision: August 2006

MTC-109

2007 Titan

DUCTS AND GRILLES
3.

Remove the RH or LH ventilator duct.

Installation
Installation is in the reverse order of removal.

CENTER VENTILATOR DUCT
Removal
1.
2.
3.
4.
5.
6.

Remove the instrument panel trim. Refer to IP-10, "Removal and Installation" .
Remove the heater and cooling unit assembly. Refer to MTC-99, "Removal and Installation" .
Remove the defroster nozzle.
Remove the RH and LH side demister ducts.
Remove the RH and LH ventilator ducts.
Remove the center ventilator duct.

Installation
Installation is in the reverse order of removal.

FLOOR DUCT
Removal
1.
2.

Remove the floor carpet. Refer to EI-41, "FLOOR TRIM" .
Remove the two clips and remove the floor duct.

Installation
Installation is in the reverse order of removal.

GRILLES
Removal
1.
2.

Remove the interior trim panel as necessary. Refer to EI-36, "BODY SIDE TRIM"
ING" .
Remove the ventilator grille from the interior trim panel.

or EI-43, "HEADLIN-

Installation
Installation is in the reverse order of removal.

Revision: August 2006

MTC-110

2007 Titan

REFRIGERANT LINES
REFRIGERANT LINES
HFC-134a (R-134a) Service Procedure

PFP:92600

A
EJS00337

SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant

WJIA0579E

Shut-off valve

A/C service valve

Recovery/recycling equipment

WARNING:
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
I
Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)
recovery equipment. If an accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and oil man- MTC
ufacturers.

Evacuating System and Charging Refrigerant

WJIA0580E

Shut-off valve

A/C service valve

Recovery/recycling equipment

Refrigerant container (HFC-134a)

Weight scale (J-39650)

Evacuating vacuum pump (J-39699)

Manifold gauge set (J-39183)

Revision: August 2006

MTC-111

2007 Titan

REFRIGERANT LINES

WJIA1923E

MTC-20, "CHECKING AND
ADJUSTING"

MTC-124, "CHECKING PROCEDURE"

MTC-122, "PRELIMINARY CHECK"

MTC-81, "PERFORMANCE TEST
DIAGNOSES"

Revision: August 2006

MTC-112

MTC-4, "Contaminated Refrigerant"

2007 Titan

REFRIGERANT LINES
Components

EJS00338

A/C Compressor and Condenser

MTC

WJIA1577E

Revision: August 2006

MTC-113

2007 Titan

REFRIGERANT LINES
1.

High-pressure service valve

Grommet

High-pressure pipe

Refrigerant pressure sensor

Condenser

Compressor shaft seal

High-pressure flexible hose

Low-pressure flexible hose

Low-pressure service valve

10. Low-pressure pipe

11. Expansion valve

12. Drain hose

NOTE:
Refer to MTC-6, "Precautions for Refrigerant Connection" .

Removal and Installation for Compressor

EJS00339

A/C Compressor Mounting

WJIA0698E

REMOVAL
1.
2.
3.
4.
5.
6.
7.

Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the front right wheel and tire assembly. Refer to WT-7, "Rotation" .
Remove the engine under cover and the splash shield using power tool.
Remove the engine air cleaner and air ducts. Refer to EM-15, "AIR CLEANER AND AIR DUCT" .
Remove the drive belt. Refer to EM-13, "DRIVE BELTS" .
Disconnect the compressor electrical connector.
Disconnect the high-pressure flexible hose and low-pressure flexible hose from the compressor.

Revision: August 2006

MTC-114

2007 Titan

REFRIGERANT LINES

CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the compressor bolts and nut using power tools.

INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-ring of the low-pressure flexible hose and high-pressure flexible hose with a new
one, apply compressor oil to them when installing them.
●
After recharging the A/C system with refrigerant, check for leaks.

Removal and Installation for Compressor Clutch

EJS0033A

Magnet Clutch Assembly
E

MTC
WJIA0372E

Magnet clutch assembly

Magnet coil

Pulley

Clutch disc

Snap ring

Thermal protector (built in)

Compressor

REMOVAL
1.
2.

Tool number
3.

Remove the compressor. Refer to MTC-114, "Removal and Installation for Compressor" .
Remove the center bolt while holding the clutch disc stationary
using Tool as shown.

: J-44614

Remove the clutch disc.

WHA228

Revision: August 2006

MTC-115

2007 Titan

REFRIGERANT LINES
4.

Remove the snap ring using external snap ring pliers or suitable
tool.

RHA072C

Remove the pulley using Tool with a small adapter. Position the
small adapter on the end of the drive shaft and the center of the
puller on the small adapter.
Tool number

: KV99233130 (J-29884)

CAUTION:
To prevent deformation of the pulley groove, the puller
claws should be hooked under the pulley groove and not
into the pulley groove.
WJIA1017E

Remove the magnet coil harness clip using a screwdriver,
remove the three magnet coil fixing screws and remove the
magnet coil.

WHA212

INSPECTION
Clutch Disc
If the contact surface shows signs of damage due to excessive heat,
replace clutch disc and pulley.

WHA183

Pulley
Check the appearance of the pulley assembly. If contact surface of pulley shows signs of excessive grooving,
replace clutch disc and pulley. The contact surfaces of the pulley assembly should be cleaned with a suitable
solvent before reinstallation.

Coil
Check magnet coil for loose connections or any cracked insulation.

Revision: August 2006

MTC-116

2007 Titan

REFRIGERANT LINES
INSTALLATION
1.

Install the magnet coil.
CAUTION:
Be sure to align the magnet coil pin with the hole in the
compressor front head.

WHA213

2.
3.

Install the magnet coil harness clip using a screwdriver.
Install the pulley assembly using Tool and a wrench, then install
the snap ring using snap ring pliers.
Tool number

—

(J-38873-A)
F

WJIA1016E

Install the clutch disc on the compressor shaft, together with the
original shim(s). Press the clutch disc down by hand.

MTC

K
WHA184

Install the clutch pulley bolt using Tool, to prevent the clutch disc
from turning and tighten the bolt to specification.
Tool number

: J-44614

CAUTION:
After tightening the clutch pulley bolt, check that the clutch
pulley rotates smoothly.

WHA229

Revision: August 2006

MTC-117

2007 Titan

REFRIGERANT LINES
6.

Check the pulley clearance all the way around the clutch disc as
shown.
Clutch disc-to-pulley clearance

: 0.3 - 0.6 mm
(0.012 - 0.024 in)

If the specified clearance is not obtained, replace the adjusting
spacer to readjust.
8. Connect the compressor electrical connector.
9. Install the drive belt. Refer to EM-13, "DRIVE BELTS" .
10. Install the engine under cover and the splash shield.

WHA194

BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engaging and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.

Removal and Installation for Low-pressure Flexible Hose

EJS0033B

REMOVAL
1.
2.
3.

Remove the engine room cover using power tool.
Remove the engine air cleaner and air ducts. Refer to EM-15, "AIR CLEANER AND AIR DUCT" .
Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Remove the low-pressure flexible hose.

INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-113, "Components" .
CAUTION:
●
Replace the O-ring of the low-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.
●
After charging refrigerant, check for leaks.

Removal and Installation for High-pressure Flexible Hose

EJS0033C

REMOVAL
1.
2.
3.
4.

Remove the engine under cover using power tool.
Remove the engine air cleaner and air ducts. Refer to EM-15, "AIR CLEANER AND AIR DUCT" .
Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the high-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-113, "Components" .

Revision: August 2006

MTC-118

2007 Titan

REFRIGERANT LINES
CAUTION:
●
Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.
●
After charging refrigerant, check for leaks.

Removal and Installation for High-pressure Pipe

EJS0033D

REMOVAL
1.
2.
3.
4.
5.
6.
7.

Disconnect the battery negative terminal and battery positive terminal.
Reposition the IPDM E/R aside.
Remove the front right wheel and tire assembly. Refer to WT-7, "Rotation" .
Position aside the front floor insulator.
Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the low pressure pipe.
Remove the high-pressure pipe.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.

INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-113, "Components" .
CAUTION:
●
Replace the O-ring of the high-pressure pipe with a new one, then apply compressor oil to it when
installing it.
●
After charging refrigerant, check for leaks.

Removal and Installation for Low-pressure Pipe

EJS0033E

REMOVAL
1.
2.

Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the low-pressure pipe.
CAUTION:
Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.

MTC

INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-113, "Components" .
CAUTION:
●
Replace the O-ring of the high/low-pressure pipe with a new one, then apply compressor oil to it
when installing it.
●
After charging refrigerant, check for leaks.

Removal and Installation for Refrigerant Pressure Sensor

EJS0033F

REMOVAL
1.
2.

Disconnect the refrigerant pressure sensor electrical connector.
Disconnect the refrigerant pressure sensor electrical connector
and remove the refrigerant pressure sensor from the condenser.
CAUTION:
Be careful not to damage the condenser fins.

LJIA0145E

INSTALLATION
Installation is in the reverse order of removal.
Refer to MTC-113, "Components" .

Revision: August 2006

MTC-119

2007 Titan

REFRIGERANT LINES
CAUTION:
●
Be careful not to damage the condenser fins.
●
Replace the O-ring of the refrigerant pressure sensor with a new one, then apply compressor oil to
it when installing it.
●
After charging refrigerant, check for leaks.

Removal and Installation for Condenser

EJS0033G

REMOVAL
1.
2.

Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the radiator. Refer to CO-14, "RADIATOR" .
CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.
Disconnect the high-pressure flexible hose and the high-pressure pipe from the condenser.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
Disconnect the refrigerant pressure sensor connector.
● Remove the refrigerant pressure sensor from the condenser
as necessary.
Lift the condenser out of the mounting grommets to remove the
condenser.

LJIA0145E

INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-rings of the high-pressure pipe, refrigerant pressure sensor, and high-pressure
flexible hose with new ones, then apply compressor oil to them when installing them.
●
Replace the grommets as necessary.
●
After charging refrigerant, check for leaks.

Revision: August 2006

MTC-120

2007 Titan

REFRIGERANT LINES
Removal and Installation for Evaporator

EJS0033H

Heater and Cooling Unit Assembly

MTC

LJIA0138E

Heater core cover

Heater core pipe bracket

Heater core

Upper bracket

Upper heater and cooling unit case

A/C evaporator

Lower heater and cooling unit case

Blower motor

Variable blower control

REMOVAL
1.

Remove the heater core. Refer to MTC-101, "Removal and Installation" .

Revision: August 2006

MTC-121

2007 Titan

REFRIGERANT LINES
2.
3.
4.

Remove the defroster mode door arm.
Separate the heater core and cooling unit case.
Remove the evaporator.

INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Replace the O-rings on the low-pressure flexible hose and the high-pressure pipe with new ones, then
apply compressor oil to them when installing them.

Removal and Installation for Expansion Valve

EJS0033I

REMOVAL
1.
2.
3.
4.

Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
Remove the evaporator. Refer to MTC-121, "Removal and Installation for Evaporator" .
Remove the cooler grommet.
Remove the expansion valve.

WJIA0582E

INSTALLATION
Installation is in the reverse order of removal.
Expansion valve bolts

: 4 N·m (0.41 kg-m, 35 in-lb)

A/C refrigerant pipe to expansion valve bolt

: Refer to MTC-113, "Components" .

CAUTION:
●
Replace the O-rings on the A/C refrigerant pipes with new ones, then apply compressor oil to them
when installing them.
●
After charging refrigerant, check for leaks.

Checking for Refrigerant Leaks

EJS0033J

PRELIMINARY CHECK
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leakage, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra
inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluorescent dye leak detector (J-42220).
If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic
refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not
properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe
along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the
component.
CAUTION:
Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will
improve the chances of finding a leak.

Checking System for Leaks Using the Fluorescent Dye Leak Detector
1.

EJS0033K

Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a
low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye

Revision: August 2006

MTC-122

2007 Titan

REFRIGERANT LINES

2.
3.
4.

will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).
If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.
After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent
future misdiagnosis.
Perform a system performance check and then verify the leak repair using a electronic refrigerant leak
detector (J-41995).
NOTE:
● Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to
be checked are clean.
● Clean with a dry cloth or blow off with shop air.
● Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any substance. This can also cause false readings and may damage the detector.

Dye Injection

3.
4.
5.

6.
7.

EJS0033L

NOTE:
This procedure is only necessary when recharging the system or when the compressor has seized and must
be replaced.
1.
2.

Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg-cm2 , 50 psi). G
Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into
the HFC-134a (R-134a) dye injector (J-41459).
H
CAUTION:
If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) directly into the open system connection and proceed with the service
I
procedures.
Connect the refrigerant dye injector (J-41459) to the low-pressure service valve.
Start the engine and switch the A/C system ON.
When the A/C system is operating (compressor running), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a MTC
(R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC134a (R-134a) dye injector (J-41459). Refer to the manufacturer's operating instructions.
With the engine still running, disconnect the HFC-134a (R-134a) dye injector (J-41459) from the low-pres- K
sure service valve.
Operate the A/C system for a minimum of 20 minutes to mix the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and L
location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detection dye to penetrate an A/C system leak and become visible.

Electronic Refrigerant Leak Detector

EJS0033M

PRECAUTIONS FOR HANDLING LEAK DETECTOR
NOTE:
When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.
Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the
manufacturer's operating instructions.
The electronic refrigerant leak detector (J-41995) is a delicate
device. To use the electronic refrigerant leak detector (J-41995)
properly, read the manufacturer's operating instructions and perform
any specified maintenance.

AHA281A

Revision: August 2006

MTC-123

2007 Titan

REFRIGERANT LINES
1.

Position the probe approximately 5 mm (3/16 in) away from the
point to be checked as shown.

SHA707EA

When checking for leaks, circle each fitting completely with the
probe as shown.

SHA706E

Move the probe along each component at a speed of approximately 25 - 50 mm (1 - 2 in)/second as shown.

SHA708EA

CHECKING PROCEDURE
NOTE:
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Turn the engine OFF.
2. Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to MTC-111, "SETTING OF
SERVICE TOOLS AND EQUIPMENT" .
3.

Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm2 , 50 psi) above a temperature of
16°C (61°F). If less than specification, recover/evacuate and recharge the system with the specified
amount of refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm2 , 50 psi) pressure.
Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to
the low-pressure side (evaporator drain hose “g” to compressor shaft seal “k”). Refer to MTC-113, "Components" . Clean the component to be checked and carefully move the electronic refrigerant leak detector
probe completely around the following connections and components.
● Check the compressor shaft seal
● Check the high and low-pressure pipe and hose fittings, and relief valve
● Check the liquid tank

Revision: August 2006

MTC-124

2007 Titan

REFRIGERANT LINES
Check the refrigerant pressure sensor
● Check all around the service valves. Ensure service valve caps are secured on the service valves (to
prevent leaks).
NOTE:
After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the service valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).
● Evaporator
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant
leak detector probe into the heater and cooling unit assembly drain hose.
NOTE:
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with
water or dirt that may be in the drain hose.
If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,
then repeat the leak check.
Do not stop when one leak is found. Continue to check for additional leaks at all system components and
connections.
If no leaks are found, perform steps 8 - 11.
Start the engine.
Set the heater A/C controls as follows:
A/C switch to ON
Air flow to VENT mode
Intake position to RECIRCULATION mode
Temperature to MAX cold
Blower fan speed to HIGH
●

5.
6.
7.
8.
9.
a.
b.
c.
d.
e.

10. Run the engine at 1,500 rpm for at least 2 minutes.
11. Turn the engine OFF and perform the leak check again following
steps 4 through 6 above.
Refrigerant leaks should be checked immediately after turning
the engine OFF. Begin with the leak detector at the compressor.
The pressure on the high pressure side will gradually drop after
the refrigerant circulation stops and pressure on the low pressure side will gradually rise, as shown in the graph. Some leaks
are more easily detected when the pressure is high.

12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refrigerant from the equipment lines and then check the refrigerant purity.
13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier
equipment.
14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refrigerant identifier equipment.
15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as
necessary.
16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant
leaks.
17. Conduct the Operational Check to ensure system works properly. Refer to MTC-43, "Operational Check"
.

MTC-125

MTC

SHA839E

Revision: August 2006

2007 Titan

SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Service Data and Specifications (SDS)

PFP:00030
EJS0033N

COMPRESSOR
Make

ZEXEL VALEO CLIMATE CONTROL

Model

DKS-17D

Type

Swash plate

Displacement

175.5 cm3 (10.7 in3 ) / revolution

Cylinder bore × stroke

30.5 mm (1.20 in) x 24.0 mm (0.94 in)

Direction of rotation

Clockwise (viewed from drive end)

Drive belt

Poly V

OIL
Name

NISSAN A/C System Oil Type S (DH-PS)

Part number

KLH00-PAGS0

Capacity

200 m

(6.8 US fl oz, 7.0 lmp fl oz)

REFRIGERANT
Type

HFC-134a (R-134a)

Capacity

0.70 ± 0.05 kg (1.54 ± 0.11 lb)

ENGINE IDLING SPEED
Refer to EC-685, "Idle Speed and Ignition Timing" .

BELT TENSION
Refer to EM-13, "Checking Drive Belts" .

Revision: August 2006

MTC-126

2007 Titan

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