Infiniti G37 Coupe. Manual - part 1267

C1923 STEERING ANGLE SEN

STC-119

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

2.

Turn the ignition switch OFF.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 1.

5.

PERFORM ACTIVE TEST (SLOW MODE)

With CONSULT-III

1.

Start engine.

CAUTION:

Check condition with the vehicle stopped.

2.

Select “SLOW MODE” item on “ACTIVE TEST” of 4WAS front control unit.

3.

Perform “MODE START” of “ACTIVE TEST”.

4.

Turn steering wheel to the left slowly until it stops.

5.

Turn steering wheel to the right slowly until it stops.

Does “OK” display on both the left and right sides on “SLOW MODE” items of the monitor?

YES

>> GO TO 6.

NO

>> Refer to 

STC-30, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special

Repair Requirement (Pattern 4)"

.

6.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

With CONSULT-III

Perform 4WAS front control unit self-diagnosis.

Is malfunction detected?

YES

>> Check malfunctioning circuit.

NO

>> GO TO 7.

7.

ERASE ERROR RECORD

With CONSULT-III

Erase memories of self-diagnosis results for 4WAS front control unit and 4WAS main control unit.

>> END

4WAS STR ANG

: 

−

3.5 – 3.5deg

STC-120

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1924 STEERING ANGLE SEN

C1924 STEERING ANGLE SEN

Description

INFOID:0000000001878425

• Steering angle sensor signal is transmitted from steering angle sensor to 4WAS main control unit via CAN

communication.

DTC Logic

INFOID:0000000001666443

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Drive continuously for 10 km (6 mile) or more.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “C1924” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-120, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666444

1.

CHECK DRIVING

Drive for a short time.
Does the vehicle drive with front wheels in the straight-ahead position?

YES

>> GO TO 2.

NO

>> Adjust the wheel alignment. Refer to 

FSU-7, "Wheel Alignment Inspection"

.

2.

PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

With CONSULT-III

 Perform ABS actuator and electric unit (control unit) self-diagnosis.

Is malfunction detected?

YES

>> Check malfunctioning circuit.

NO

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is DTC “U1000” or “U1010” detected?

YES

>> Check malfunctioning circuit.

NO

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis.
Is DTC “C1924” detected?

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

NO

>> GO TO 5.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1924

STEERING ANGLE SEN
[NO NEUT STATE]

Driving continuously at 10 km (6 mile) or more while the 
steering angle sensor value is not L10

°

 - R10

°

.

(Not detected in 4WAS front control unit fail-safe mode)

Steering angle sensor in-
put signal error

C1924 STEERING ANGLE SEN

STC-121

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

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 standard?

YES

>> Check pin terminal and connection of each harness connector for non-standard conditions.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

Special Repair Requirement

INFOID:0000000001666445

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”.

AFTER REPLACING STEERING ANGLE SENSOR

1.

PERFORM ACTIVE TEST (LOCK OPERATION)

With CONSULT-III

1.

Stop vehicle with front wheels in the straight-ahead position.

2.

Turn the ignition switch ON.

CAUTION:

Never start engine.

3.

Select “LOCK OPERATION” item on “ACTIVE” of 4WAS front control unit.

4.

Perform “RELEASE” of “ACTIVE TEST”.

CAUTION:

• Turn steering wheel 90

°

, and then check that front tire does not move.

• Never turn steering wheel 1 turn or more while performing “RELEASE”.

5.

Place steering wheel in neutral position.

6.

Perform “LOCK” item on “ACTIVE TEST” of 4WAS front control unit.

7.

Steer 30

°

 leftward slowly. Steer 30

°

 rightward and return the steering wheel to the straight-ahead position.

8.

Complete active test of 4WAS front control unit.

>> GO TO 2.

2.

STEERING ANGLE SENSOR NEUTRAL POSITION ADJUSTMENT

With CONSULT-III

1.

Adjust steering angle sensor neutral position. Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE

SENSOR NEUTRAL POSITION : Special Repair Requirement"

.

2.

Turn the ignition switch OFF.

>> GO TO 3.

3.

RETURN TO 4WAS FRONT ACTUATOR INITIAL POSITION

1.

Start engine.

CAUTION:

Check condition with the vehicle stopped.

2.

Turn steering wheel to the left by 90

°

 slowly, and then turn to the right by 90

°

.

3.

Again, turn steering wheel to the left by 90

°

 slowly, and then turn to the right by 90

°

 so that it faces straight

ahead.

4.

Stop vehicle with front wheels in the straight-ahead position after driving vehicle for a short time. (Engine
starting)

>> GO TO 4.

STC-122

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1924 STEERING ANGLE SEN

4.

CHECK 4WAS FRONT ACTUATOR

With CONSULT-III

1.

Check “4WAS STR ANG” item on “DATA MONITOR” of 4WAS front control unit.

CAUTION:

Never touch steering wheel while performing.

2.

Turn the ignition switch OFF.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 1.

5.

PERFORM ACTIVE TEST (SLOW MODE)

With CONSULT-III

1.

Start engine.

CAUTION:

Check condition with the vehicle stopped.

2.

Select “SLOW MODE” item on “ACTIVE TEST” of 4WAS front control unit.

3.

Perform “MODE START” of “ACTIVE TEST”.

4.

Turn steering wheel to the left slowly until it stops.

5.

Turn steering wheel to the right slowly until it stops.

Does “OK” display on both the left and right sides on “SLOW MODE” items of the monitor?

YES

>> GO TO 6.

NO

>> Refer to 

STC-30, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special

Repair Requirement (Pattern 4)"

.

6.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)

With CONSULT-III

Perform 4WAS front control unit self-diagnosis.

Is malfunction detected?

YES

>> Check malfunctioning circuit.

NO

>> GO TO 7.

7.

ERASE ERROR RECORD

With CONSULT-III

Erase memories of self-diagnosis results for 4WAS front control unit and 4WAS main control unit.

>> END

4WAS STR ANG

: 

−

3.5 – 3.5deg