Infiniti QX56 (Z62). Manual - part 812

 

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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 

HA-27, "Symptom Table"

.

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 

HAC-69, "REAR AUTOMATIC AIR

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-146, "Removal and Installation"

.

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 

CO-8, "Inspection"

.

2.

Check reservoir tank cap. Refer to 

CO-11, "RESERVOIR TANK CAP : Inspection"

.

3.

Check water flow sounds of the engine coolant. Refer to 

CO-9, "Refilling"

.

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 

HAC-68, "FRONT AUTOMATIC AIR

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 

CO-8, "Inspection"

.

2.

Check reservoir tank cap. Refer to 

CO-11, "RESERVOIR TANK CAP : Inspection"

.

3.

Check water flow sounds of the engine coolant. Refer to 

CO-9, "Refilling"

.

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 

HAC-69, "REAR AUTOMATIC AIR

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-146, "Removal and Installation"

.

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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