Infiniti EX35. Manual — part 934
HAC-132
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
SYMPTOM DIAGNOSIS
AIR CONDITIONER CONTROL
Diagnosis Chart By Symptom
INFOID:0000000003545649
Symptom
Reference
A/C system does not activate.
Go to Trouble Diagnosis Procedure for A/C System.
A/C system cannot be controlled.
Go to Preset Switch System.
(BASE AUDIO WITHOUT
NAVIGATION),
(BOSE AU-
DIO WITHOUT NAVIGATION)
or
(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 tempera-
ture separately control system)
(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 tempera-
ture separately control system)
(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.
No cool air comes out.
(Air flow volume is normal.)
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
No warm air comes out.
(Air flow volume is normal.)
AIR CONDITIONER CONTROL
HAC-133
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Noise
Go to Trouble Diagnosis Procedure for Noise.
Self-diagnosis cannot be per-
formed.
Go to Trouble Diagnosis Procedure for Self-diagnosis.
Memory function does not operate.
Go to Trouble Diagnosis Procedure for Memory Function.
Symptom
Reference
HAC-134
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
Description
INFOID:0000000003545650
Symptom
• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)
Inspection procedure
INFOID:0000000003545651
1.
CHECK WITH A GAUGE OF RECOVERY/RECYCLING RECHARGING EQUIPMENT
Connect the recovery/recycling recharging equipment to the vehicle and perform the pressure inspection 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 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 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-8, "WITHOUT LEFT AND RIGHT VENTILA-
TION TEMPERATURE SEPARATELY CONTROL SYSTEM : Temperature Setting Trimmer"
(Without left and
right ventilation temperature separately control system) or
HAC-13, "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-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-63, "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-135
< 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-57, "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-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-63, "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-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-63, "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-57, "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 tension of the drive belt. Refer to
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Adjust or replace 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
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