Infiniti G37 Coupe. Manual - part 774

 

  Index      Infiniti     Infiniti G37 Coupe - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  772  773  774  775   ..

 

 

Infiniti G37 Coupe. Manual - part 774

 

 

MAGNET CLUTCH

HAC-85

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

MAGNET CLUTCH

Description

INFOID:0000000001675713

Magnet clutch drives a compressor, by a signal of IPDM E/R.

Component Function Check

INFOID:0000000001675714

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press AUTO switch and A/C switch.

2.

Display should indicate AUTO. Confirm that the magnet clutch engages (sound or visual inspection). (Dis-
charge air and blower speed depend on ambient, in-vehicle and set temperatures.)

Does the magnet clutch operate?

YES

>> END.

NO

>> Go to Diagnosis Procedure. Refer to 

HAC-85, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001675715

1.

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.

Is there any malfunction displayed?

YES

>> 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 

HAC-48, "WITH LEFT

AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"

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

NO

>> GO TO 2.

2.

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

>> END.

NO

>> GO TO 3.

3.

PERFORM IPDM E/R AUTO ACTIVE TEST

Perform IPDM E/R auto active test. Refer to 

PCS-11, "Diagnosis Description"

.

Does the magnet clutch operate?

YES

>> •

WITH CONSULT-III: GO TO 6.

WITHOUT CONSULT-III: GO TO 7.

NO

>> Check 10A fuse (No. 49, located in IPDM E/R), and GO TO 4.

4.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and compressor connector.

3.

Check continuity between IPDM E/R harness connector and compressor harness connector.

IPDM E/R

Compressor

Continuity

Connector

Terminal

Connector

Terminal

E7

48

F43

1

Existed

HAC-86

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage direct current to terminal.
Is the inspection result normal?

YES

>> 1.

Replace IPDM E/R.

2.

Refer to self-diagnosis procedure 

HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left

and right ventilation temperature 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) and per-

form self-diagnosis STEP-4. Confirm that magnet clutch operation normal.

NO

>> 1.

Replace compressor.

2.

Refer to self-diagnosis procedure 

HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left

and right ventilation temperature 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) and per-

form self-diagnosis STEP-4. Confirm that magnet clutch operation normal.

6.

CHECK ECM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal in “Data monitor”. Refer to 

HAC-47, "WITHOUT LEFT AND RIGHT VENTI-

LATION TEMPERATURE SEPARATELY CONTROL SYSTEM : CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 7.

7.

CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT-III

1.

Start the engine.

2.

Check voltage of refrigerant pressure sensor in “Data monitor”. Refer to 

HAC-102, "Reference Value"

.

WITHOUT CONSULT-III

1.

Start the engine.

2.

Check voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> •

WITH CONSULT-III: GO TO 8.

WITHOUT CONSULT-III: Repair harness or connector.

NO

>> Refer to 

EC-511, "Diagnosis Procedure"

.

8.

CHECK ECM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal in “Data monitor”. Refer to 

HAC-47, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : CONSULT-III Function"

.

A/C SW ON

: AIR COND SIG ON

A/C SW OFF

: AIR COND SIG OFF

(+)

(

)

Condition

Voltage

ECM

 connector

Terminal

M107

105

Ground

A/C switch: ON

(Blower motor operates.)

Approx. 1.0 - 4.0 V

FAN SW ON

: HEATER FAN SW ON

FAN SW OFF

: HEATER FAN SW OFF

MAGNET CLUTCH

HAC-87

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair harness or connector.

9.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

• ECM – IPDM E/R
• ECM – Unified meter and A/C amp.

Is the inspection result normal?

YES

>> Replace ECM.

NO

>> Repair or replace malfunctioning part(s).

HAC-88

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

AMBIENT SENSOR

Description

INFOID:0000000001675717

COMPONENT DESCRIPTION

Ambient Sensor

The ambient sensor (1) is attached on the bumper reinforcement
(right side). It detects ambient temperature and converts it into a
resistance value which is then input into the unified meter and A/C
amp.

Ambient Sensor Circuit

AMBIENT TEMPERATURE INPUT PROCESS

The unified meter and A/C amp. equips a processing circuit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified meter and A/C amp. to recognize an ambient temperature
increase of 0.33

°

C (0.6

°

F) per 100 seconds.

As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the ambient sensor increases. This is because the
heat from the engine compartment can radiate to the front bumper area, location of the ambient sensor.

Component Function Check

INFOID:0000000001675718

1.

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.
21 or 

21 is displayed.

YES

>> Go to Diagnosis Procedure. Refer to 

HAC-88, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

INFOID:0000000001675719

1.

CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND

1.

Disconnect ambient sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between ambient sensor harness connector and ground.

JSIIA0658ZZ

RJIA4088E

 

 

 

 

 

 

 

Content   ..  772  773  774  775   ..