Infiniti G35 (V35) Sedan. Manual - part 1300

STC-90

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1902, C1903, C1904, C1910, C1913 4WAS REAR MOTOR OUTPUT

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the harnesses and connectors.

2.

CHECK 4WAS REAR MOTOR

Check the continuity between 4WAS rear motor connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>>  Replace 4WAS rear actuator. Refer to 

STC-180, "Exploded View"

.

3.

PERFORM ACTIVE TEST (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

1.

Connect 4WAS main control unit harness connector.

2.

Connect 4WAS rear motor harness connector.

3.

Perform “SELF DIAGNOSTIC MODE” item on “ACTIVE TEST” of 4WAS main control unit.

CAUTION:

Perform the active test while vehicle is stopped.

4.

Check “MOTOR VOLTAGE”, “MOTOR CURRENT” and “MTR CRNT OPE” while performing the active
test.

Is “MONITOR” the standard value?

YES

>> GO TO 4.

NO

>>  Replace 4WAS rear actuator. Refer to 

STC-180, "Exploded View"

.

4.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC “C1902”, “C1903”, “C1904”, “C1910” or “C1913” detected?

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

NO

>> GO TO 5.

5.

CHECK INFORMATION

 With CONSULT-III

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

STC-155,

"Reference Value"

.

Is each data the standard value?

YES

>> Check each harness connector pin terminal for disconnection.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

Component Inspection (4WAS Rear Motor)

INFOID:0000000000958833

1.

CHECK 4WAS REAR MOTOR

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS main control unit harness connector and 4WAS rear motor harness connector.

3.

Check the continuity between 4WAS rear motor connector.

4WAS rear motor

Continuity

Connector

Terminal

B36

1 – 2

Existed

Monitor item

Condition

Display value

MOTOR VOLTAGE

Ignition switch: ON

Battery voltage

MOTOR CURRENT

4WAS rear motor running

0 – 20 A

MTR CRNT OPE

4WAS rear actuator neutral condition 
and vehicle straight-ahead position

Approx. 

−

2 – 2 A

4WAS rear motor running

Approx. 

−

20 – 20 A

C1902, C1903, C1904, C1910, C1913 4WAS REAR MOTOR OUTPUT

STC-91

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>  Replace 4WAS rear actuator. Refer to 

STC-180, "Exploded View"

.

Special Repair Requirement

INFOID:0000000000958834

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

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

main 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).

4WAS rear motor

Continuity

Connector

Terminal

B36

1 – 2

Existed

STC-92

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT

C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT

Description

INFOID:0000000000958835

• 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe functions stops the rear wheel angle (the front wheel is the steering wheel cutting angle) when

the electric components and the mechanical components are malfunctioning.

• The protection function mode stops 4WAS system intermittently when the input signal does not input to

4WAS main control unit.

• 4WAS front control unit and 4WAS main control unit control the best control of 4WAS system by 4WAS com-

munication line.

DTC Logic

INFOID:0000000000958836

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

 With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform 4WAS main control unit self-diagnosis.

Is any DTC “C1905”, “C1908”, “C1922”, “C1925” or “C1928” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-92, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958837

1.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

 With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC “C1905”, “C1908”, “C1922”, “C1925” or “C1928” detected?

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

NO

>> GO TO 2.

2.

CHECK INFORMATION

 With CONSULT-III

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

STC-155,

"Reference Value"

.

Is each data the standard value?

YES

>> Check each harness connector pin terminal for disconnection.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1905

CONTROL UNIT
[ABNORMAL3]

An error is detected inside 4WAS main control unit.

4WAS main control unit 
error

C1908

CONTROL UNIT
[ABNORMAL7]

An error is detected inside 4WAS main control unit.

4WAS main control unit 
error

C1922

CONTROL UNIT
[ABNORMAL8]

An error is detected inside 4WAS main control unit.

4WAS main control unit 
error

C1925

AD CONVERTER

An error is detected inside 4WAS main control unit.

4WAS main control unit 
error

C1928

CONTROL UNIT
[ABNORMAL9]

An error is detected inside 4WAS main control unit.

4WAS main control unit 
error

C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT

STC-93

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Special Repair Requirement

INFOID:0000000000958838

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

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

main 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).