Infiniti G35 (V35) Sedan. Manual - part 1294

STC-66

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1655 4WAS FRONT DRIVER

C1655 4WAS FRONT DRIVER

Description

INFOID:0000000000958778

• It perform control inside 4WAS front control unit. 
• The power supply for 4WAS front motor (3-phase motor).

DTC Logic

INFOID:0000000000958779

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 “C1655” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-66, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958780

1.

CHECK 4WAS REAR MOTOR GROUND

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front control unit harness connector.

3.

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.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

 With CONSULT-III

1.

Connect 4WAS front control unit harness connector.

2.

Perform 4WAS front control unit self-diagnosis.

Is DTC “C1622” detected?

YES

>> Check the error system.

NO

>> Replace 4WAS front control unit. Refer to 

STC-177, "Exploded View"

.

Special Repair Requirement

INFOID:0000000000958781

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.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1655

PRE-DRIVER

4WAS rear motor 3-phase current error is detected.
(Current is not applied to 4WAS front motor)

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

4WAS front control unit

Continuity

Connector

Terminal

M203

12 – Ground

Existed

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” 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-68

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1661 4WAS FRONT LOCK SOLENOID VALVE

C1661 4WAS FRONT LOCK SOLENOID VALVE

Description

INFOID:0000000000958782

• 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:0000000000958783

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 “C1661” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-68, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958784

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 

ST-21, "WITH 4WAS : Exploded View"

.

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

If 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 

Ω

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:0000000000958785

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 

ST-21, "WITH 4WAS : Exploded View"

.

Special Repair Requirement

INFOID:0000000000958786

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:

• 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)"

.

4WAS front actuator

Resistance 

(Approx.)

Connector

Terminal

Connector

Terminal

M351

10

M351

3

1 – 100 

Ω

4WAS front actuator

Continuity

Connector

Terminal

M351

3 – Ground

Not existed

10 – Ground