Infiniti QX56 (Z62). Manual — part 812
INSUFFICIENT COOLING
HAC-139
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NOTE:
The control temperature can be set with the setting of the temperature setting trimmer (front).
3.
Set difference between set temperature and control temperature to “0”.
Is inspection result normal?
YES
>> INSPECTION END
NO
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
REAR AIR CONDITIONER
REAR AIR CONDITIONER : Description
INFOID:0000000006275986
Symptom
• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)
REAR AIR CONDITIONER : Diagnosis Procedure
INFOID:0000000006275987
NOTE:
Perform self-diagnoses with CONSULT-III before performing symptom diagnosis. If any DTC is detected, per-
form the corresponding diagnosis.
1.
CHECK REAR A/C SOLENOID VALVE
Check rear A/C solenoid valve. Refer to
HAC-128, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning parts.
2.
CHECK REFRIGERANT CYCLE
Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts depending on the inspection results.
3.
CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the rear air conditioning system for leakage.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace parts depending on the inspection results.
4.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)
1.
Check setting value of temperature setting trimmer (rear). Refer to
CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)"
.
2.
Check that temperature setting trimmer (rear) is set to “+ direction”.
NOTE:
The control temperature can be set with the setting of the temperature setting trimmer (rear).
3.
Set difference between set temperature and control temperature to “0”.
Is inspection result normal?
YES
>> INSPECTION END
NO
>> Replace A/C auto amp.. Refer to
HAC-140
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
INSUFFICIENT HEATING
INSUFFICIENT HEATING
FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : Description
INFOID:0000000006275990
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
FRONT AIR CONDITIONER : Diagnosis Procedure
INFOID:0000000006275991
NOTE:
Perform self-diagnoses with on board diagnosis and CONSULT-III before performing symptom diagnosis. If
DTC is detected, perform the corresponding diagnosis.
1.
CHECK COOLING SYSTEM
1.
Check engine coolant level and check leakage. Refer to
2.
Check reservoir tank cap. Refer to
CO-11, "RESERVOIR TANK CAP : Inspection"
3.
Check water flow sounds of the engine coolant. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Refill engine coolant and repair or replace parts depending on the inspection results.
2.
CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts depending on the inspection results.
3.
CHECK FRONT HEATER CORE
1.
Check temperature of inlet hose and outlet hose of front heater core.
2.
Check that inlet side of front heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.
CAUTION:
Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front heater core. Refer to
HA-44, "HEATER CORE : Removal and Installation"
4.
CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace parts depending on the inspection results.
5.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1.
Check setting value of temperature setting trimmer (front). Refer to
CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)"
2.
Check that temperature setting trimmer (front) is set to “
−
direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (front).
3.
Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES
>> INSPECTION END
NO
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
REAR AIR CONDITIONER
INSUFFICIENT HEATING
HAC-141
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
REAR AIR CONDITIONER : Description
INFOID:0000000006275992
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
REAR AIR CONDITIONER : Diagnosis Procedure
INFOID:0000000006275993
CAUTION:
Perform the self-diagnoses with on board diagnosis and CONSULT-III before performing symptom
diagnosis. If any malfunction result or DTC is detected, perform the corresponding diagnosis.
1.
CHECK COOLING SYSTEM
1.
Check engine coolant level and check leakage. Refer to
2.
Check reservoir tank cap. Refer to
CO-11, "RESERVOIR TANK CAP : Inspection"
3.
Check water flow sounds of the engine coolant. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Refill the engine coolant and repair or replace the parts depending on the inspection results.
2.
CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts depending on the inspection results.
3.
CHECK REAR HEATER CORE
1.
Check temperature of inlet hose and outlet hose of rear heater core.
2.
Check that the inlet side of rear heater core is hot and the outlet side is slightly lower than/almost equal to
the inlet side.
CAUTION:
Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace rear heater core. Refer to
HA-48, "HEATER CORE : Removal and Installation"
.
4.
CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the rear air conditioning system for air leakage.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace parts depending on the inspection results.
5.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)
1.
Check setting value of temperature setting trimmer (rear). Refer to
CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)"
.
2.
Check that the temperature setting trimmer is set to “
−
direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (rear).
3.
Set the difference between the set temperature (rear) and control temperature to “0”.
Are the symptoms solved?
YES
>> INSPECTION END
NO
>> Replace A/C auto amp.. Refer to
HAC-142
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
COMPRESSOR DOSE DOT OPERATE
COMPRESSOR DOSE DOT OPERATE
Description
INFOID:0000000006275994
Symptom: Compressor dose not operate.
Diagnosis Procedure
INFOID:0000000006275995
NOTE:
• Perform self-diagnoses with CONSULT-III before performing symptom diagnosis. If DTC is detected, per-
form the corresponding diagnosis.
• Check that refrigerant is enclosed in cooler cycle normally. If refrigerant amount is shortage from proper
amount, perform inspection of refrigerant leakage.
1.
CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to
HAC-126, "Component Function Check"
Does it operate normally?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning parts.
2.
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to
EC-520, "Component Function Check"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning parts.
3.
CHECK A/C AUTO AMP. OUTPUT SIGNAL
With CONSULT-III
Check “COMP REQ SIG” and “FAN REQ SIG” in “DATA MONITOR” mode of “HVAC” using CONSULT-III.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
4.
CHECK ECM INPUT SIGNAL
With CONSULT-III
Check “AIR COND SIG” and “HEATER FAN SW” in “DATA MONITOR” mode of “ECM” using CONSULT-III.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Check CAN communication system. Refer to
LAN-18, "Trouble Diagnosis Flow Chart"
5.
CHECK IPDM E/R INPUT SIGNAL
With CONSULT-III
1.
Start engine.
Monitor item
Condition
Status
COMP REQ SIG
A/C switch
ON
On
OFF
Off
FAN REQ SIG
Front blower motor
ON
On
OFF
Off
Monitor item
Condition
Status
COMP REQ SIG
A/C switch
ON
On
OFF
Off
HEATER FAN SW
Front blower motor
ON
On
OFF
Off
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