Infiniti G37 Coupe. Manual - part 1256

 

  Index      Infiniti     Infiniti G37 Coupe - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  1254  1255  1256  1257   ..

 

 

Infiniti G37 Coupe. Manual - part 1256

 

 

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”.

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:0000000001666365

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

DTC Logic

INFOID:0000000001666366

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 “C1672” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-76, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666367

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 

STC-179, "Removal and Installation"

.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000001666368

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)"

.

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:0000000001666369

• 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 adopts twisted-pair wires. Refer to 

STC-

176, "Precautions for Harness Repair"

.

DTC Logic

INFOID:0000000001666370

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 from 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:0000000001666371

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

STC-78

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION

Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

STC-176, "Precautions for Harness

Repair"

.

3.

CHECK COMMUNICATION LINE (3)

Check the continuity between ABS actuator and electric unit (control unit) harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

STC-176, "Precautions for Harness

Repair"

.

4.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check the continuity between ABS actuator and electric unit (control unit) connector. Refer to 

STC-84, "Com-

ponent Inspection [ABS Actuator and Electric Unit (Control Unit)]"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-102, "Exploded View"

.

5.

CHECK YAW RATE/SIDE G SENSOR

Check the continuity between yaw rate/side G sensor connector. Refer to 

BRC-62, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace yaw rate/side G sensor. Refer to 

BRC-104, "Exploded View"

.

6.

CHECK CAN DIAGNOSIS SUPPORT MONITOR (4WAS FRONT CONTROL UNIT)

With CONSULT-III

1.

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

2.

Connect yaw rate/side G sensor harness connector.

3.

Connect 4WAS front control unit harness connector.

4.

Connect 4WAS main control unit harness connector.

5.

Start the engine.

CAUTION:

Stop the vehicle.

6.

Perform CAN diagnosis support monitor of 4WAS front control unit.

7.

Replace 4WAS main control unit error history. Refer to 

STC-39, "CONSULT-III Function

[4WAS(FRONT)]"

.

What is the indicated item?

All items are “OK”>>GO TO 7.
“TRANSMIT DIAG” is other than “OK”>>GO TO 7.
“4WAS(MAIN)” is other than “OK”>>GO TO 8.

7.

CHECK 4WAS FRONT CONTROL UNIT CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front control unit harness connector.

3.

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

ABS actuator and electric unit (control unit)

Continuity

Connector

Terminal

E41

25 – Ground

Not existed

45 – Ground

ABS actuator and electric unit (control unit)

Continuity

Connector

Terminal

E41

25 – 45

Not existed

 

 

 

 

 

 

 

Content   ..  1254  1255  1256  1257   ..