Infiniti G35 (V35) Sedan. Manual - part 1296

STC-74

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1671 ACTUATOR ADJUSTMENT NOT PERFORMED

C1671 ACTUATOR ADJUSTMENT NOT PERFORMED

Description

INFOID:0000000000958799

• Memorize the neutral position of 4WAS front actuator in 4WAS front control unit.

DTC Logic

INFOID:0000000000958800

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 “C1671” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-74, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958801

1.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

 With CONSULT-III

Perform 4WAS front control unit self-diagnosis.

Is any DTC other than “C1671” detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

4WAS FRONT ACTUATOR ADJUSTMENT

 With CONSULT-III

1.

Perform 4WAS front actuator adjustment. Refer to 

STC-28, "4WAS FRONT ACTUATOR NEUTRAL

POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)"

.

2.

Perform 4WAS front control unit self-diagnosis.

Is any DTC other than “C1671” 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 DTC “C1671” detected?

YES

>> Replace 4WAS front control unit. Refer to 

STC-177, "Exploded View"

.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000000958802

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

C1671

ACT ADJ NOT PRFRM

4WAS front actuator adjustment is not performed.

4WAS front actuator ad-
justment is not per-
formed.

C1671 ACTUATOR ADJUSTMENT NOT PERFORMED

STC-75

< 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-76

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1672 INCOMPLETE ACTUATOR ADJUSTMENT

C1672 INCOMPLETE ACTUATOR ADJUSTMENT

Description

INFOID:0000000000958803

• Memorize the neutral position of 4WAS front actuator in 4WAS front control unit.

DTC Logic

INFOID:0000000000958804

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 “C1672” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-76, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958805

1.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

 With CONSULT-III

Perform 4WAS front control unit self-diagnosis.
Is any DTC other than “C1672” detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

ADJUST 4WAS FRONT ACTUATOR

 With CONSULT-III

1.

Perform 4WAS front actuator adjustment. Refer to 

STC-28, "4WAS FRONT ACTUATOR NEUTRAL

POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)"

.

2.

Perform 4WAS front control unit self-diagnosis.

Is any error system detected?

YES

>>

Replace 4WAS front control unit. Refer to 

STC-177, "Exploded View"

.

• Perform 4WAS actuator adjustment after replacing 4WAS front control unit. Perform the 4WAS

front control unit self-diagnosis again. Replace 4WAS front actuator if DTC “C1672” is detected.
Refer to 

ST-21, "WITH 4WAS : Exploded View"

.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000000958806

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)"

.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1672

INCOMP ACTUATR ADJ

4WAS front actuator adjustment is incomplete.

4WAS front actuator ad-
justment is incomplete.

C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION

STC-77

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION

Description

INFOID:0000000000958807

• 4WAS front control unit and 4WAS main control unit transmit/receive information to/from each other for opti-

mum control of the 4WAS system with the specified 4WAS system line (4WAS communication line) between
4WAS front control unit and 4WAS main control unit.

• Be careful to repair wirings because 4WAS system specified line adopt a twisted wire. Refer to 

STC-176,

"Precautions for Harness Repair"

.

DTC Logic

INFOID:0000000000958808

DTC DETECTION LOGIC

*: Communication line between 4WAS front control unit and 4WAS main control unit

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 “C1684” or “C1685” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-77, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958809

1.

CHECK COMMUNICATION LINE (1)

1.

Turn the ignition switch OFF.

2.

Disconnect ABS actuator and electric unit (control unit) harness connector.

3.

Disconnect yaw rate/side G sensor harness connector.

4.

Disconnect 4WAS front control unit harness connector.

5.

Disconnect 4WAS main control unit harness connector.

6.

Check the continuity between ABS actuator and electric unit (control unit) harness connector and yaw
rate/side G sensor harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the harnesses and connectors. Refer to 

STC-176, "Precautions for Harness

Repair"

.

2.

CHECK COMMUNICATION LINE (2)

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1684

4WAS MAIN ECU COMM

4WAS communication line* data communication error 
is detected.
(An error signal is detected from 4WAS main control 
unit.)

4WAS communication 
line*/4WAS main control 
unit/4WAS front control 
unit error

C1685

4WAS MAIN ECU COMM

4WAS communication line* data communication error 
is detected.
(An error signal is detected from 4WAS main control 
unit.)

4WAS communication 
line*/4WAS main control 
unit/4WAS front control 
unit error

ABS actuator and electric 

unit (control unit)

Yaw rate/side G sensor.

Continuity

Connector

Terminal

Connector

Terminal

E41

25

M143

2

Existed

45

3