Infiniti G37 Coupe. Manual - part 1268

 

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Infiniti G37 Coupe. Manual - part 1268

 

 

C1926, C1932 STEERING ANGLE SENSOR

STC-123

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1926, C1932 STEERING ANGLE SENSOR

Description

INFOID:0000000001878426

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

communication.

DTC Logic

INFOID:0000000001666447

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Turn the steering wheel leftward slowly. Steer until the turning stops.

3.

Turn the steering wheel rightward slowly. Steer to the straight-forward position.

4.

Perform 4WAS main control unit self-diagnosis.

Is DTC “C1926” or “C1932” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-123, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666448

1.

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

With CONSULT-III

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

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

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 the error system.

NO

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis
Is DTC “C1926” or “C1932” detected?

C1926 >> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1926

STEERING ANGLE SEN

Malfunction is detected in steering angle sensor signal 
that is output from steering angle sensor via CAN com-
munication.
(When improper signal inputs to steering angle sensor 
and steering angle sensor itself detects the malfunc-
tion)

Steering angle sensor er-
ror

C1932

STEERING ANGLE SEN

If the steering angle sensor error is detected.
(Steering angle sensor output value is abnormal.)

Steering angle sensor in-
put signal error

STC-124

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1926, C1932 STEERING ANGLE SENSOR

C1932 >> Replace steering angle sensor. Refer to 

BRC-105, "Exploded View"

.

NO

>> GO TO 4.

4.

INFORMATION CHECK

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 that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

Special Repair Requirement

INFOID:0000000001666449

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)

C1926, C1932 STEERING ANGLE SENSOR

STC-125

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

>> GO TO 4.

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

STC-126

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1930 4WAS FRONT CONTROL UNIT

C1930 4WAS FRONT CONTROL UNIT

Description

INFOID:0000000001666450

• It transmits the value calculated by 4WAS main control unit to 4WAS front control unit via 4WAS communica-

tion line (line for 4WAS system only). 4WAS front control unit controls 4WAS front actuator according to the
received command value.

DTC Logic

INFOID:0000000001666451

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 “C1930” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-126, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666452

1.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC other than “C1930” detected?

YES

>> Check the error system.

NO

>> Perform 4WAS front control unit self-diagnosis.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1930

4WAS FRONT ECU

An error is detected on 4WAS front control unit side.
(4WAS front control unit fail-safe mode)

4WAS front control unit 
fail-safe mode

 

 

 

 

 

 

 

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