service INFINITI QX56 2009 Factory Service Manual

HA-46
< ON-VEHICLE REPAIR >
REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR
Removal and Installation for Refrigerant Pressure SensorINFOID:0000000003775321
REMOVAL
1. Discharge the refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure".
2. Disconnect the refrigerant pressu re sensor electrical connector
and remove the refrigerant pressure sensor from the condenser.
CAUTION:
Be careful not to damage the condenser fins.
INSTALLATION
Installation is in the reverse order of removal.
Refer to HA-29, "Component"
.
CAUTION:
 Be careful not to damage the condenser fins.
 Replace the O-ring of the refriger ant pressure sensor with a new one, then apply compressor oil to it
when installing it.
 After charging refrigerant, check for leaks.
LJIA0145E
Revision: December 20092009 QX56

EXPANSION VALVEHA-47
< ON-VEHICLE REPAIR >
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EXPANSION VALVE
Removal and Installation for Front Expansion ValveINFOID:0000000003775322
REMOVAL
1. Discharge the refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure".
2. Remove the front evaporator. Refer to VTL-35, "Removal and Installation for Front Evaporator"
.
3. Remove the cooler grommet.
4. Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
 Replace the O-rings on the A/C re frigerant pipes with new ones, then apply compressor oil to them
when installing them.
 After charging refrigerant, check for leaks.
WJIA0582E
Expansion valve bolts : 4 N·m (0.41 kg-m, 35 in-lb)
A/C refrigerant pipe to expansion valve bolt : Refer to HA-29, "Component"
.
Revision: December 20092009 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
HA-49
< SERVICE DATA AND SPECIFICATIONS (SDS)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Service Data and Specification (SDS)INFOID:0000000003775323
COMPRESSOR
OIL
REFRIGERANT
Make ZEXEL VALEO CLIMATE CONTROL
Model DKS-17D
Typ e Swash plate
Displacement 175.5 cm
3 (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
Name NISSAN A/C System Oil Type S
Capacity 290 m (9.8 US fl oz, 10.2 Imp fl oz)
Typ eHFC 134a (R-134a)
Capacity 1.08 ± 0.05 kg (2.38 ± 0.11 lb)
Revision: December 20092009 QX56

HAC-2
MAGNET CLUTCH ............................................72
System Description .............................................. ...72
Magnet Clutch Component Function Check ........ ...72
Magnet Clutch Diagnosis Procedure ................... ...73
WATER VALVE CIRCUIT ..................................77
Description ........................................................... ...77
Water Valve Diagnosis Procedure ..........................77
AMBIENT SENSOR ...........................................79
Component Description ....................................... ...79
Ambient Sensor Diagnosis Procedure ....................79
Ambient Sensor Component Inspection .................80
IN-VEHICLE SENSOR .......................................82
Component Description ....................................... ...82
In-Vehicle Sensor Diagnosis Procedure .................82
In-Vehicle Sensor Component Inspection ..............84
OPTICAL SENSOR ...........................................85
Component Description ..........................................85
Optical Sensor Diagnosis Procedure ......................85
INTAKE SENSOR ..............................................87
System Description .............................................. ...87
Intake Sensor Diagnosis Procedure .......................87
Intake Sensor Component Inspection ................. ...88
POWER SUPPLY AND GROUND CIRCUIT
FOR CONTROLLER ..........................................
89
Component Description ....................................... ...89
A/C Auto Amp. Component Function Check ..........89
A/C Auto Amp Power and Ground Diagnosis Pro-
cedure .....................................................................
90
ECU DIAGNOSIS .......................................91
AIR CONDITIONER CONTROL ..................... ...91
A/C Auto Amp. Terminals Reference Values ..........91
Wiring Diagram .................................................... ...93
SYMPTOM DIAGNOSIS ...........................109
AIR CONDITIONER CONTROL ..................... ..109
Symptom Matrix Chart ........................................ .109
INSUFFICIENT COOLING ................................110
Component Function Check ................................ .110
Diagnostic Work Flow ...........................................111
Performance Chart ................................................113
Trouble Diagnoses for Abnormal Pressure ...........114
INSUFFICIENT HEATING ................................118
Component Function Check .................................118
NOISE ...............................................................120
Component Function Check ................................ .120
MEMORY FUNCTION DOES NOT OPERATE ..122
Memory Function Check ...................................... .122
PRECAUTION ...........................................123
PRECAUTIONS .............................................. ..123
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
123
Working with HFC-134a (R-134a) ........................ .123
Precaution for Service Equipment ........................124
Revision: December 20092009 QX56

DIAGNOSIS AND REPAIR WORKFLOWHAC-3
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
How to Perform Trouble Diagnosis For Quick And Accurate RepairINFOID:0000000003775324
WORK FLOW
1.LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.
>> GO TO 2
2.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-4, "
Operational Check (Front)".
Can a symptom be duplicated?
YES >> GO TO 4
NO >> GO TO 5
4.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-109, "
SymptomMatrixChart".
Can a symptom be duplicated?
>> GO TO 5.
5.PERFORM THE A/C AUTO AMP SELF-DIAGNOSIS
Perform A/C auto amp. self-diagnosis. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
>> If any diagnostic trouble codes set. Refer to HAC-24, "
A/C System Self-Diagnosis Code Chart".
>> Confirm the repair by perform ing operational check. Refer to HAC-4, "
Operational Check (Front)".
Revision: December 20092009 QX56

HAC-26
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the A/C auto amp. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front)
Component Function CheckINFOID:0000000003775344
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - DISCHARGE AIR
1. Press mode switch four times and then press the (DEF) switch. Each position indicator should change shape (on display).
2. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-16, "
Discharge
Air Flow (Front)".
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 HAC-4, "
Operational Check
(Front)".
Can a symptom be duplicated?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair as necessary.
5.PERFORM A/C AUTO AMP. SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnosis codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 6.
6.PERFORM A/C AND AV SWITCH ASSEMBLY SELF-DIAGNOSIS
Perform self-diagnosis to check the A/C and AV switch assembly. Refer to HAC-23, "
A/C and AV Switch
Assembly Self-Diagnosis".
Is the inspection result normal?
YES >> Replace A/C and AV switch assembly. Refer to VTL-7, "Removal and Installation".
NO >> GO TO 7.
WJIA0587E
Revision: December 20092009 QX56

AIR MIX DOOR MOTORHAC-33
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Perform a complete operational check and check for any symptoms. Refer to HAC-4, "Operational Check
(Front)".
Can a symptom be duplicated?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
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 18 °C (60 °F) to 32° C (90°F) in each
mode.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair as necessary.
6.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C and AV Switch Assembly Self-Diagno-
sis".
Are any self-diagnosis codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 7.
7.CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the air mix door motors. Refer to HAC-32, "
Air Mix Door Motor Component
Function Check".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair PBR circuit or replace air mix door motor. Refer to VTL-26, "
Removal and Installation".
8.RECHECK FOR CODES
Perform self-diagnosis. Refer to HAC-23, "
A/C and AV Switch Assembly Self-Diagnosis".
Are any self-diagnostic codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 9.
9.RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
Air Mix Door Motor (Driver) Diagnosis ProcedureINFOID:0000000003775348
SYMPTOM:• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (DRIVER)
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
Revision: December 20092009 QX56

HAC-42
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
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 A/C auto amp. Motor rotation is
conveyed to a lever which activates the intake door.
Intake Door Motor Component Function CheckINFOID:0000000003775351
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING
OPERATIONAL CHECK - REC ( )
1. Press the mode switch to vent mode( ).
2. Press REC ( ) switch. The REC ( )indicator should illuminate.
3. Press REC ( ) switch again. The REC ( ) indicator should go out.
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 HAC-4, "
Operational Check
(Front)".
Can a symptom be duplicated?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK INTAKE DOOR OPERATION
Check and verify intake door mechanism for smooth operation.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair intake door mechanism.
5.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C and AV Switch Assembly Self-Diagno-
sis".
Are any self-diagnosis codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 6.
6.RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
WJIA0552E
Revision: December 20092009 QX56

HAC-46
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
Defroster Door Motor Component Function Check
INFOID:0000000003775354
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - DEFROSTER DOOR
1. Press the mode switch and select vent ( ).
2. Press the defrost switch ( ). Defroster indicator should illuminate (on display).
3. Listen for defroster door position c hange (blower sound should change slightly).
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 HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> SYSTEM OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK DEFROSTER DOOR MOTOR
Perform diagnostic procedure for defroster door motor. Refer to HAC-46, "
Defroster Door Motor Component
Function Check".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair PBR circuit or replace defroster door motor. Refer to VTL-21, "
Removal and Installation".
5.CHECK DEFROSTER DOOR OPERATION
Check and verify defroster door mechanism for smooth operation.
Is the inspection result normal?
YES >> Replace defroster door motor. Refer to VTL-21, "Removal and Installation".
NO >> Repair defroster door mechanism.
Defroster Door Motor Diagnosis ProcedureINFOID:0000000003775355
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the defroster switch ( ).
3. Check voltage between A/C auto amp. harness connector M49 terminal 24 and terminal 23 and pr ess the defroster switch ( )
again.
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 24 23 Press de-
froster switch Battery
voltage
AWIIA0152ZZ
Revision: December 20092009 QX56

BLOWER MOTOR CONTROL SYSTEMHAC-51
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature
are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. Duri ng conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions , the A/C auto amp. causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the A/C auto amp.
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
Front Blower Motor Component Function CheckINFOID:0000000003775357
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Push blower motor (+) switch. Blower motor should operate.
2. Rotate the front blower control dial clockwise, and continue checking blower speed and fan symbol 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 HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.PERFORM A/C AUTO AMP. SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnosis codes present?
WJIA0441E
WJIA0559E
Revision: December 20092009 QX56