Infiniti G35 (V35) Sedan. Manual — part 1293

STC-62

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1652 4WAS FRONT MOTOR POWER SUPPLY

C1652 4WAS FRONT MOTOR POWER SUPPLY

Description

INFOID:0000000000958770

• The power supply for 4WAS front motor and 4WAS front control unit.

DTC Logic

INFOID:0000000000958771

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1652” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-62, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958772

1.

4WAS REAR MOTOR GROUND INSPECTION

1.

Turn the ignition switch OFF.

2.

Check the continuity between 4WAS front control unit harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the harnesses and connectors.

2.

4WAS FRONT MOTOR POWER SUPPLY INSPECTION

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check the voltage between 4WAS front control unit harness connectors.

Is the measurement value “9 V” or less?

YES

>>

Check the following items. Repair or replace the malfunctioning parts.

• 4WAS front control unit harness connector pin terminal and connection
• 40A fusible link (#I) open
- Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11

terminal and the ground

• Open between the battery and 4WAS front control unit harness connector No. 11 terminal
• Battery

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1652

MOTOR POWER SUPPLY

4WAS front motor main power supply error is detected

4WAS front control unit or
4WAS front motor power
supply error is detected.

4WAS front control unit

Continuity

Connector

Terminal

M203

12 – Ground

Existed

4WAS front control unit

Voltage (Approx.)

Connector

Terminal

M203

11 – 12

Battery voltage

C1652 4WAS FRONT MOTOR POWER SUPPLY

STC-63

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

NO

>> GO TO 3.

3.

4WAS FRONT CONTROL UNIT SIGNAL INSPECTION

With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check “

MOTOR

VOLT” item on “DATA MONITOR” of 4WAS front control unit.

Does the item on “DATA MONITOR” indicate “16 V” or more?

YES

>> Perform the symptom diagnosis for the charging system. Refer to

CHG-18, "Symptom Table"

.

NO

>> Replace 4WAS front control unit. Refer to

STC-177, "Exploded View"

.

Special Repair Requirement

INFOID:0000000000958773

BEFORE REPLACING 4WAS FRONT CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Replace it without erasing the memory (history) of self-diagnosis results when replacing 4WAS

front control unit after diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR” when erasing the memory of the self-diagnosis results (record).

AFTER REPLACING 4WAS FRONT CONTROL UNIT

• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to

STC-28, "4WAS

FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"

.

STC-64

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1654 4WAS FRONT ACTUATOR RELAY

C1654 4WAS FRONT ACTUATOR RELAY

Description

INFOID:0000000000958774

• It performs control inside 4WAS front control unit.
• The actuator relay turns ON when turning the ignition switch ON.
• The actuator relay continues turning ON by control of the 4WAS front control unit if the ignition switch turns

OFF from ON. The actuator relay turns OFF after a few minutes.

DTC Logic

INFOID:0000000000958775

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1654” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-64, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958776

1.

4WAS REAR MOTOR GROUND INSPECTION

1.

Turn the ignition switch OFF.

2.

Check the continuity between 4WAS front control unit harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the harnesses and connectors.

2.

4WAS FRONT MOTOR POWER SUPPLY INSPECTION

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check the voltage between 4WAS front control unit harness connectors.

Is the measurement value “9 V” or less?

YES

>>

Check the following items. Repair or replace the malfunctioning parts.

• 4WAS front control unit harness connector pin terminal and connection
• 40A fusible link (#I) open

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1654

ACTUATOR RELAY

An error is detected on the main relay power supply in-
side 4WAS front control unit.

The main relay power
supply inside 4WAS front
control unit error is de-
tected.

4WAS front control unit

Continuity

Connector

Terminal

M203

12 – Ground

Existed

4WAS front control unit

Voltage (Approx.)

Connector

Terminal

M203

11 – 12

Battery voltage

C1654 4WAS FRONT ACTUATOR RELAY

STC-65

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

- Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11

terminal and the ground

• Open between the battery and 4WAS front control unit harness connector No. 11 terminal
• Battery

NO

>> GO TO 3.

3.

4WAS FRONT CONTROL UNIT SIGNAL INSPECTION

With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check “

MOTOR

VOLT” item on “DATA MONITOR” of 4WAS front control unit.

Does the item on “DATA MONITOR” indicate “16 V” or more?

YES

>> Perform the symptom diagnosis for the charging system. Refer to

CHG-18, "Symptom Table"

.

NO

>> Replace 4WAS front control unit. Refer to

STC-177, "Exploded View"

.

Special Repair Requirement

INFOID:0000000000958777

BEFORE REPLACING 4WAS FRONT CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Replace it without erasing the memory (history) of self-diagnosis results when replacing 4WAS

front control unit after diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR” when erasing the memory of the self-diagnosis results (record).

AFTER REPLACING 4WAS FRONT CONTROL UNIT

• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to

STC-28, "4WAS

FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"

.