Infiniti G35 (V35) Sedan. Manual - part 1320

STC-170

< SYMPTOM DIAGNOSIS >

[WITH 4WAS]

4WAS WARNING LAMP DOES NOT TURN OFF

4WAS WARNING LAMP DOES NOT TURN OFF

Description

INFOID:0000000000958929

• 4WAS system stops (error) when turning 4WAS warning lamp ON.

Diagnosis Procedure

INFOID:0000000000958930

1.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC detected other than “C1930” or “C1931”?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM TROUBLE DIAGNOSIS (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

1.

Check the error system detected from the self-diagnosis.

2.

Perform 4WAS main control unit self-diagnosis again after the inspection.

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

 With CONSULT-III

Perform 4WAS front control unit self-diagnosis.

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

Perform 4WAS main control unit self-diagnosis.
Is any error system detected?

YES

>> Check the error system.

NO

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

STEERING WHEEL MISS ALIGNMENT

STC-171

< SYMPTOM DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

STEERING WHEEL MISS ALIGNMENT

Description

INFOID:0000000000958931

• The steering wheel position (center) is in the wrong position at driving.
• 4WAS system stops temporarily.

NOTE:
• The steering wheel position (center) is in the wrong position under the following condition. (4WAS system

is in the protection mode. This is normal status.)

- When steering frequently
- When driving on a rough road
- When the assist of power steering is not sufficient
- When the battery voltage is weak
- When driving under the status that there is a difference in the steering wheel

Diagnosis Procedure

INFOID:0000000000958932

1.

CHECK SYMPTOM

Stop the vehicle in the straight-ahead position after driving for a period of time. 

Does the steering wheel position (center) misalign?

YES

>> INSPECTION END (Entered in 4WAS system protection function mode in past. 4WAS system is

normal at present.)

NO

>> GO TO 2.

2.

4WAS FRONT ACTUATOR INITIALIZATION

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Steer to 90

°

 leftward slowly. Steer to 90

°

 rightward and return the steering wheel to the straight-ahead

position. Repeat the above 10 times.

3.

Stop the vehicle in the straight-ahead position after driving for a period of time. 

Does the steering wheel position (center) misalign?

YES

>> INSPECTION END (Entered in 4WAS system protection function mode in past. 4WAS system is

normal at present.)

NO

>> GO TO 3.

3.

4WAS SYSTEM CONDITION

 With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check “EX OPERAT” item on “DATA MONITOR” of 4WAS front control unit.

Does the item on “DATA MONITOR” indicate “On”?

YES

>> GO TO 7.

NO

>> GO TO 4.

4.

CHECK STEERING SYSTEM

Check the steering system. Refer to 

ST-12, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace the specific malfunctioning part.

5.

CHECK WHEEL ALIGNMENT

Check the wheel alignment. Refer to 

FSU-8, "Wheel Alignment Inspection"

 (front side), 

FSU-28, "Wheel Align-

ment Inspection"

 (rear side).

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace the specific malfunctioning part.

STC-172

< SYMPTOM DIAGNOSIS >

[WITH 4WAS]

STEERING WHEEL MISS ALIGNMENT

6.

PERFORM 4WAS FRONT ACTUATOR ADJUSTMENT

1.

Perform 4WAS front actuator adjustment. Refer to 

STC-28, "4WAS FRONT ACTUATOR NEUTRAL

POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"

.

2.

Stop the vehicle in the straight-ahead position after driving for a period of time. 

Does the steering wheel position (center) misalign?

YES

>> INSPECTION END.

NO

>> GO TO 7.

7.

CHECK 4WAS SYSTEM IGNITION POWER SUPPLY

Perform the trouble diagnosis of the ignition power supply. Refer to 

STC-60, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace the specific malfunctioning part.

8.

CHECK 4WAS SYSTEM 4WAS FRONT MOTOR POWER SUPPLY

Perform the trouble diagnosis of 4WAS front motor power supply. Refer to 

STC-62, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace the specific malfunctioning part.

9.

CHECK 4WAS SYSTEM HISTORY

 With CONSULT-III

1.

Turn the ignition switch OFF.

CAUTION:

Wait 30 minutes or more after turning the ignition switch OFF.

2.

Start the engine.

CAUTION:

Stop the vehicle.

3.

Check “EX OPERAT” on 4WAS front control unit “DATA MONITOR”.

Is the value of DATA MONITOR “On”?

YES

>>

Replace 4WAS front control unit. Refer to 

STC-177, "Exploded View"

.

• 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)"

.

NO

>> INSPECTION END

Monitor item

Condition

Display value

EX OPERAT

Ignition switch: ON

On

STEERING SYSTEM VIBRATION AND NOISE

STC-173

< SYMPTOM DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

STEERING SYSTEM VIBRATION AND NOISE

Description

INFOID:0000000000958933

• Vibration or noise occurs in the steering wheel while driving the vehicle.

NOTE:
• Vibration or noise occurs in the steering wheel in the following conditions.(4WAS system is not malfunc-

tion.)

- 4WAS system starts and ends (when the engine speed is ON

⇔

OFF).

- System protection mode
• When steering frequently
• When driving on a rough road
• When the assist of power steering is not sufficient
• When the battery voltage is weak

Diagnosis Procedure

INFOID:0000000000958934

1.

CHECK 4WAS SYSTEM

 With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Check “OVRLE JDG FLG”, “ACT PRTCT FLG”, “ECU PRTCT FLG”,“LOW VOLT FLG”, “HIGH VOLT
FLG”, “EX OPERAT” items on “DATA MONITOR” of 4WAS front control unit.

Does all items on “DATA MONITOR” indicate “Off”?

YES

>> INSPECTION END (Vibration and sound occurs in 4WAS system protection function mode. This

is normal.)

NO

>> GO TO 2.

2.

STOP 4WAS FRONT ACTUATOR CONTROL

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front actuator harness connector.

CAUTION:

Disconnect 4WAS front actuator harness connector 10 minutes after turning the ignition switch
OFF. 

3.

Drive the vehicle for a period of time. Check the symptom.

CAUTION:

Erase the self-diagnosis memory after the inspection is completed to detect 4WAS front control
unit DTC “C1661”. [Erase the self diagnosis memory of 4WAS main control unit, ABS actuator and
electric unit (control unit) and ICC sensor integrated simultaneously.]

Does symptom not occur?

YES

>> Replace 4WAS front actuator. Refer to 

ST-21, "WITH 4WAS : Exploded View"

.

NO

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

ST-3, "NVH Troubleshooting

Chart"

.