2009 INFINITI QX56 Factory Service Manual

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Page 2417 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-104
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIIA0059GB
Revision: December 20092009 QX56

Page 2418 of 4171

INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-105
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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ABIIA0060GB
Revision: December 20092009 QX56

Page 2419 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-106
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIIA0061GB
Revision: December 20092009 QX56

Page 2420 of 4171

INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-107
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Revision: December 20092009 QX56

Page 2421 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-108
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
AAIIA0058GB
Revision: December 20092009 QX56

Page 2422 of 4171

INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-109
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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SYMPTOM DIAGNOSIS
AIR CONDITIONER CONTROL
Symptom Matrix ChartINFOID:0000000003775390

Page 2423 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-110
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
Component Function CheckINFOID:0000000003775391
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.CONFI

HAC-110
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
Component Function CheckINFOID:0000000003775391
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPER
ATIONAL CHECK - TEMPERATURE DECREASE
1. Press the AUTO switch.
2. Turn temperature control dial (driver) counterclockwise until 16 °C (60 °F) is displayed.
3. 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
Perform a complete operational check for any symptoms. Refer to HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-109, "SymptomMatrixChart".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Refer to HAC-24, "
A/C System Self-Diagnosis Code Chart".
5.CHECK DRIVE BELTS
Check compressor belt tension. Refer to EM-13, "
Checking Drive Belts".
Is the inspection result normal?
OK >> GO TO 6.
NG >> Adjust or replace compressor belt. Refer to EM-13, "
Removal and Installation".
6.CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation. Refer to HAC-32, "
Air Mix Door Motor Compo-
nent Function Check".
Does air mix door operate correctly?
YES >> GO TO 7.
NO >> Check air mix door motor circuit. Refer to HAC-33, "
Air Mix Door Motor (Driver) Diagnosis Proce-
dure" or HAC-36, "Air Mix Door Motor (Passenger) Diagnosis Procedure".
7.CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to EC-388, "
Component Inspection".
Does cooling fan motor operate correctly?
YES >> GO TO 8.
NO >> Check cooling fan motor. Refer to EC-388, "
Diagnosis Procedure".
8.CHECK WATER VALVE OPERATION
Check and verify water valve for smooth operation. Refer to HAC-77, "
Description".
Does water valve operate correctly?
YES >> GO TO 9.
Revision: December 20092009 QX56

Page 2424 of 4171

INFINITI QX56 2009 Factory Service Manual INSUFFICIENT COOLINGHAC-111
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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NO >> Check water valve circuit. Refer to HAC-77, "Water Valve Diagnosis Procedure".
9.

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