Infiniti G37 Coupe. Manual — part 785
AIR CONDITIONER CONTROL
HAC-129
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
SYMPTOM DIAGNOSIS
AIR CONDITIONER CONTROL
Diagnosis Chart By Symptom
INFOID:0000000001675740
Symptom
Reference
A/C system does not activate.
Go to Trouble Diagnosis Procedure for A/C System.
HAC-101, "Diagnosis Procedure"
A/C system cannot be controlled.
Go to Preset Switch System.
(BASE
AUDIO WITHOUT NAVIGATION),
(BOSE
AUDIO WITHOUT NAVIGATION)
(BOSE AUDIO WITH NAVIGA-
TION)
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
(LAN)
Mode door motor does not operate
normally.
Discharge air temperature does not
change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
(LAN)
(Without left and right ventilation
temperature separately control
system) or
(With left and right
ventilation temperature separately
control system)
Air mix door motor does not operate
normally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
(LAN)
Intake door motor does not operate
normally.
Blower motor operation is malfunc-
tioning.
Go to Trouble Diagnosis Procedure for Blower Motor.
(Without left and right ventilation
temperature separately control
system) or
(With left and right
ventilation temperature separately
control system)
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
HAC-130, "Inspection procedure"
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
HAC-133, "Inspection procedure"
Noise
Go to Trouble Diagnosis Procedure for Noise.
HAC-135, "Inspection procedure"
Self-diagnosis cannot be per-
formed.
Go to Trouble Diagnosis Procedure for Self-diagnosis.
HAC-137, "Inspection procedure"
Memory function does not operate.
Go to Trouble Diagnosis Procedure for Memory Function.
HAC-130
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
Description
INFOID:0000000001675741
Symptom
• Insufficient cooling
• No cold air comes out. (Air flow volume is normal.)
Inspection procedure
INFOID:0000000001675742
1.
CHECK WITH A GAUGE OF REFRIGERANT RECONERY/RECYCLING RECHARGING EQUIPMENT
Connect refrigerant recovery/recycling recharging equipment to the vehicle and perform the pressure inspec-
tion with the gauge.
Is there refrigerant?
YES
>> GO TO 2.
NO-1
>> Check for refrigerant leakages with the refrigerant leakage detecting fluorescent leak detector.
.
NO-2
>> GO TO 2 after repairing or replacing the parts according to the inspection results.
2.
CHECK CHARGED REFRIGERANT AMOUNT
1.
Connect refrigerant recovery/recycling recharging equipment to the vehicle and discharge the refrigerant.
2.
Recharge with the proper amount of refrigerant and perform the inspection with the refrigerant leakage
detecting fluorescent leak detector. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Refill the refrigerant and repair or replace the parts according to the inspection results.
3.
CHECK REFRIGERANT CYCLE PRESSURE
Connect refrigerant recovery/recycling recharging equipment to the vehicle and perform the performance test.
Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Perform the diagnosis with the gauge pressure. Refer to
HA-7, "Trouble Diagnosis For Unusual
4.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER
Check the setting of temperature setting trimmer. Refer to
HAC-7, "WITHOUT LEFT AND RIGHT VENTILA-
TION TEMPERATURE SEPARATELY CONTROL SYSTEM : Temperature Setting Trimmer"
(Without left and
right ventilation temperature separately control system) or
HAC-11, "WITH LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL SYSTEM : Temperature Setting Trimmer"
(With left and right ven-
tilation temperature separately control system).
1.
Check that the temperature setting trimmer is set to “+ direction”.
NOTE:
The control temperature can be set with the setting of temperature setting trimmer.
2.
Set temperature control dial to “0”.
Are the symptoms solved?
YES
>> Perform the setting separately if necessary. END.
NO
>> GO TO 5.
5.
PERFORM SELF-DIAGNOSIS STEP-2
Perform self-diagnosis STEP-2. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see Nos. 1 to 2.
Does code No. 20 appear on the display?
YES
>> GO TO 6.
INSUFFICIENT COOLING
HAC-131
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NO
>> Go to appropriate malfunctioning sensor circuit. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT
VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation temperature separately control system) or
AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"
(With left and right ventilation temperature separately control system), see No. 11.
6.
PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see Nos.1 to 5.
Is it operated normally?
YES
>> GO TO 7.
NO
>> Perform the diagnosis applicable to each output device.
7.
PERFORM SELF-DIAGNOSIS STEP-5
Perform self-diagnosis STEP-5. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see Nos.1 to 10.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Go to appropriate malfunctioning sensor circuit. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT
VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation temperature separately control system) or
AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"
(With left and right ventilation temperature separately control system).
8.
CHECK DRIVE BELT
Check the drive belt. Refer to
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Adjust or replace the drive belt.
9.
CHECK AIR LEAKAGE FROM DUCT
Check duct and nozzle, etc. of A/C system for air leakage.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace parts according to the inspection results.
10.
CHECK POWER SUPPLY FOR ECV (ELECTRIC CONTROL VALVE)
1.
Disconnect compressor (ECV) connector.
2.
Turn ignition switch ON.
3.
Check voltage between compressor (ECV) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
CHECK FUSE
(+)
(
−
)
Voltage
Compressor (ECV)
—
Connector
Terminal
F44
2
Ground
Battery voltage
HAC-132
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
Check power supply circuit and 10A fuse [No. 3, located in the fuse block (J/B)]. Refer to
nector and Terminal Arrangement"
Is the inspection result normal?
YES
>> Check harness for open circuit. Repair or replace if necessary.
NO
>> Replace fuse and check harness for short circuit. Repair or replace if necessary.
12.
CHECK ECV CONTROL SIGNAL
1.
Turn ignition switch OFF.
2.
Reconnect compressor (ECV) connector.
3.
Perform self-diagnosis. Refer to
HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature
separately control system).
4.
Set in self-diagnosis STEP-4 (Code No. 45).
5.
Confirm ECV control signal between unified meter and A/C amp
harness connector M67 terminal 65 and ground using an oscillo-
scope.
Is the inspection result normal?
YES
>> Replace compressor.
NO
>> GO TO 13.
13.
CHECK CIRCUIT CONTINUITY BETWEEN ECV AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect compressor (ECV) connector and unified meter and A/C amp.connector.
3.
Check continuity between compressor (ECV) harness connector and unified meter and A/C amp harness
connector.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair the harnesses or connectors.
14.
CHECK ECV
Check continuity between compressor (ECV) connector.
Is the inspection result normal?
YES
>> Replace the unified meter and A/C amp.
NO
>> Replace the compressor.
SJIA1765E
Compressor (ECV)
Unified meter and A/C amp.
Continuity
Connector
Terminal
Connector
Terminal
F44
3
M67
65
Existed
Compressor (ECV)
Continuity
Connector
Terminal
Connector
Terminal
F44
2
F44
3
Existed
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