Infiniti G37 Coupe. Manual - part 1254

 

  Index      Infiniti     Infiniti G37 Coupe - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  1252  1253  1254  1255   ..

 

 

Infiniti G37 Coupe. Manual - part 1254

 

 

C1655 4WAS FRONT DRIVER

STC-67

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

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

ues of “DATA MONITOR”.

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-68

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1661 4WAS FRONT LOCK SOLENOID VALVE

C1661 4WAS FRONT LOCK SOLENOID VALVE

Description

INFOID:0000000001666344

• Secure the inside of 4WAS front actuator temporarily. (It operates when performing active test with fail-safe

function and CONSULT-III.)

• 4WAS front lock solenoid valve is activated in the active test (lock release). The secured 4WAS front actua-

tor is released.

• 4WAS front control unit controls 4WAS front actuator. 4WAS front actuator releases the lock when the

engine speed signal is “ON”. 4WAS front actuator applies the lock when the engine speed signal is “OFF”.

DTC Logic

INFOID:0000000001666345

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1661” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-68, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666346

1.

CHECK 4WAS FRONT SOLENOID VALVE CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front actuator harness connector.

3.

Check the resistance between 4WAS front actuator harness connectors.

4.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace 4WAS front actuator. Refer to 

STC-179, "Removal and Installation"

.

2.

CHECK INFORMATION

With CONSULT-III

1.

Connect 4WAS front actuator harness connector.

2.

Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to 

STC-

142, "Reference Value"

.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1661

LOCK SOLENOID

4WAS front lock solenoid valve error is detected.
(An electric activation error is detected.)

4WAS front control unit or 
4WAS front lock solenoid 
valve error is detected.

4WAS front actuator

Resistance 

(Approx.)

Connector

Terminal

Connector

Terminal

M351

10

M351

3

1 – 100 

4WAS front actuator

Continuity

Connector

Terminal

M351

3 – Ground

Not existed

10 – Ground

C1661 4WAS FRONT LOCK SOLENOID VALVE

STC-69

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is each data the standard value?

YES

>> Check each harness connector pin terminal for disconnection.

NO

>> Replace 4WAS front control unit. Refer to 

STC-177, "Exploded View"

.

Component Inspection (4WAS Front Lock Solenoid Valve)

INFOID:0000000001666347

1.

CHECK 4WAS FRONT SOLENOID VALVE CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front actuator harness connector.

3.

Check the resistance between 4WAS front actuator harness connectors.

4.

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

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Replace 4WAS front actuator. Refer to 

STC-179, "Removal and Installation"

.

Special Repair Requirement

INFOID:0000000001666348

AFTER REPLACING 4WAS FRONT ACTUATOR

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

STC-28, "4WAS

FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)"

.

BEFORE REPLACING 4WAS FRONT CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase 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”.

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)"

.

4WAS front actuator

Resistance 

(Approx.)

Connector

Terminal

Connector

Terminal

M351

10

M351

3

1 – 100 

4WAS front actuator

Continuity

Connector

Terminal

M351

3 – Ground

Not existed

10 – Ground

STC-70

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1667 LOCK INSERTION

C1667 LOCK INSERTION

Description

INFOID:0000000001666349

• Wiring connected to 4WAS front actuator is integrated with 4WAS front actuator.
• 4WAS front actuator rotates together with steering wheel.
• 4WAS front actuator mainly consists of five components. [4WAS front lock solenoid valve (lock structure),

front wheel steering angle sensor, 4WAS front motor, gear shaft, and spiral cable]

- 4WAS front lock solenoid valve (lock structure) is controlled by the 4WAS front control unit, and locks/

unlocks 4WAS front actuator.

- If a strong force (rotation direction) is applied to 4WAS front actuator, the locking mechanism (holder)

absorbs the force and locks 4WAS front actuator.

- Front wheel steering angle sensor detects a turning angle of 4WAS front motor.
- 4WAS front motor controls number of revolutions by a command value from the 4WAS front control unit.
- Gear shaft is an output axis of 4WAS front motor. (Gear shaft = 4WAS front motor revolution + steering

angle)

- Spiral cables mean the power line and signal lines of 4WAS front motor.

DTC Logic

INFOID:0000000001666350

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Steer 30

°

 leftward slowly. Steer 30

°

 rightward. Return the steering wheel to the straight-ahead position.

3.

Turn the ignition switch OFF.

4.

Turn the ignition switch ON.

5.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1667” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-70, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666351

1.

CHECK 4WAS FRONT LOCK SOLENOID VALVE (LOCK STRUCTURE)

With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Steer 30

°

 leftward slowly. Steer 30

°

 rightward. Return the steering wheel to the straight-ahead position.

3.

Turn the ignition switch OFF.

4.

Turn the ignition switch ON.

5.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1667” detected?

YES

>> Replace 4WAS front actuator. Refer to 

STC-179, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK INFORMATION

With CONSULT-III

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1667

LOCK INSERTION

4WAS front lock solenoid valve (lock) error is detected.
(An error is detected in lock condition.)

The inside 4WAS front 
actuator error is detected.

 

 

 

 

 

 

 

Content   ..  1252  1253  1254  1255   ..