Infiniti EX35. Manual - part 935

HAC-136

< 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 

PG-98, "Fuse, Con-

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-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE

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

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

INSUFFICIENT HEATING

HAC-137

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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INSUFFICIENT HEATING

Description

INFOID:0000000003545652

Symptom

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

Inspection procedure

INFOID:0000000003545653

1.

CHECK COOLING SYSTEM

1.

Check engine coolant level and check for leakage. Refer to 

CO-7, "Inspection"

.

2.

Check radiator cap. Refer to 

CO-11, "RADIATOR CAP : Inspection"

.

3.

Check water flow sounds of engine coolant. Refer to 

CO-8, "Refilling"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refill the engine coolant and repair or replace the parts according to the inspection results.

2.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER

1.

Check the setting of temperature setting trimmer. Refer to 

HAC-8, "WITHOUT LEFT AND RIGHT VENTI-

LATION 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 ventilation temperature separately control system).

2.

Check that the temperature setting trimmer is set to “

−

 direction”. 

NOTE:
The control temperature can be set with the setting of temperature setting trimmer.

3.

Set temperature control dial to “0”.

Are the symptoms solved?

YES

>> Perform the setting separately if necessary. END.

NO

>> GO TO 3.

3.

CHECK OPERATION

1.

Turn temperature dial (driver side) and raise temperature setting to 32

°

C (90

°

F) after warming up the

engine.

2.

Check that warm air blows from outlets.

Is the inspection result normal?

YES

>> END.

NO

>> GO TO 4.

4.

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 5.

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 

HAC-63, "WITH LEFT

AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"

 (With left and right ventilation temperature separately control system), see No. 11.

5.

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

HAC-138

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT HEATING

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos. 1 to 5.
Is it installed normally?

YES

>> GO TO 6.

NO

>> Perform the diagnosis applicable to each output device. 

6.

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).
Is the inspection result normal?

YES

>> GO TO 7.

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 

HAC-63, "WITH LEFT

AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"

 (With left and right ventilation temperature separately control system).

7.

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 8.

NO

>> Repair or replace parts according to the inspection results.

8.

CHECK HEATER HOSE INSTALLATION CONDITION

Check the heater hose installation condition visually (for twist, crush, etc.).

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace parts according to the inspection results.

9.

CHECK TEMPERATURE OF HEATER HOSE

1.

Check the temperature of inlet hose and outlet hose of heater core.

2.

Check that the inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.

CAUTION:

The temperature inspection should be performed in a short time because the engine coolant tem-
perature is too hot.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace the heater core after performing the procedures after the cooling system inspection

again. GO TO 1.

10.

REPLACE HEATER CORE

Replace the heater core. Refer to heater core. Refer to 

VTL-46, "Removal and Installation"

.

Are the symptoms solved?

YES

>> END

NO

>> Perform the procedures after the cooling system inspection again. GO TO 1.

NOISE

HAC-139

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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NOISE

Description

INFOID:0000000003545654

Symptom

• Noise
• Noise is heard when the A/C system operates.

Inspection procedure

INFOID:0000000003545655

1.

CHECK OPERATION

1.

Operate the A/C system and check the operation. Refer to 

HAC-6, "WITHOUT LEFT AND RIGHT VENTI-

LATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (Without left

and right ventilation temperature separately control system) or 

HAC-11, "WITH LEFT AND RIGHT VENTI-

LATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (With left and

right ventilation temperature separately control system).

2.

Check the parts where noise is occurring.

Can the parts where noise is occurring be checked?

YES-1 >> Noise from blower motor: GO TO 2.
YES-2 >> Noise from compressor: GO TO 3.
YES-3 >> Noise from expansion valve: GO TO 4.
YES-4 >> Noise from A/C piping (pipe, flexible hose): GO TO 6.
YES-5 >> Noise from drive belt: GO TO 7.
NO

>> END.

2.

CHECK BLOWER MOTOR

1.

Remove blower motor.

2.

Remove in-cabin microfilter.

3.

Remove foreign materials that are in the blower unit.

4.

Check the noise from blower motor again.

Is the inspection result normal?

YES

>> END.

NO

>> Replace blower motor.

3.

REPLACE COMPRESSOR

1.

Correct the refrigerant with recovery/recycling recharging equipment.

2.

Recharge with the proper amount of the collected refrigerant after recycling or new refrigerant.

3.

Check for the noise from compressor again.

Is the inspection result normal?

YES

>> END.

NO

>> Replace compressor.

4.

CHECK WITH GAUGE PRESSURE

Perform the diagnosis with the gauge pressure. Refer to 

HA-7, "Trouble Diagnosis For Unusual Pressure"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning part(s).

5.

REPLACE EXPANSION VALVE

1.

Correct the refrigerant with recovery/recycling recharging equipment.

2.

Recharge with the proper amount of the collected refrigerant after recycling or new refrigerant.

3.

Check for the noise from expansion valve again.

Are the symptoms solved?

YES

>> END.

NO

>> Replace expansion valve.

6.

CHECK A/C PIPING (PIPE, FLEXIBLE HOSE)