Infiniti G37 Coupe. Manual - part 1260

 

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Infiniti G37 Coupe. Manual - part 1260

 

 

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:0000000001666396

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase 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”.

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:0000000001878370

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

angle) when the electric components and the mechanical components are malfunctioning.

• The protective function stops 4WAS system temporarily when the input signal is not inputted to 4WAS main

control unit (When battery-power dose not work temporarily).

• 4WAS front control unit and 4WAS main control unit perform two-way transmitting/receiving signals for opti-

mal control of 4WAS system via 4WAS communication line.

DTC Logic

INFOID:0000000001666398

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch from 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:0000000001666399

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:0000000001666400

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase 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”.

STC-94

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1909 4WAS MAIN CONTROL UNIT

C1909 4WAS MAIN CONTROL UNIT

Description

INFOID:0000000001878371

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

angle) when the electric components and the mechanical components are malfunctioning.

• The protective function stops 4WAS system temporarily when the input signal is not inputted to 4WAS main

control unit (When battery-power dose not work temporarily).

• 4WAS front control unit and 4WAS main control unit perform two-way transmitting/receiving signals for opti-

mal control of 4WAS system via 4WAS communication line.

DTC Logic

INFOID:0000000001666402

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “C1909” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-94, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666403

1.

CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS main control unit harness connector.

3.

Check the voltage between 4WAS main control unit harness connector terminal and the ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS main control unit harness connector terminal and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NG

>>

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

• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 ter-

minal and the ground

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1909

CONTROL UNIT
[ABNORMAL6]

An error is detected inside 4WAS main control unit.

4WAS main control unit

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

0 V

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

Battery voltage

 

 

 

 

 

 

 

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