Infiniti G35 (V35) Sedan. Manual - part 1306

STC-114

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1920 STEERING ANGLE SEN

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 that 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

C1921 ENGINE SPEED SIGNAL

STC-115

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1921 ENGINE SPEED SIGNAL

Description

INFOID:0000000000958872

• The engine speed signal is transmitted to 4WAS main control unit via CAN communication.

DTC Logic

INFOID:0000000000958873

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

 With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “C1921” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-115, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958874

1.

PERFORM ECM SELF-DIAGNOSIS

 With CONSULT-III

 Perform ECM 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 “C1921” detected?

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "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"

.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1921

ENG REV SIGNAL

Malfunction is detected in engine speed signal that is 
output from ECM with CAN communication.
(Improper signal is input engine speed.)

Engine speed signal error

STC-116

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C1921 ENGINE SPEED SIGNAL

Special Repair Requirement

INFOID:0000000000958875

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Replace it without erasing 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” when erasing the memory of the self-diagnosis results (record).

C1923 STEERING ANGLE SEN

STC-117

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1923 STEERING ANGLE SEN

Description

INFOID:0000000000958876

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

communication.

DTC Logic

INFOID:0000000000958877

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

 With CONSULT-III

1.

Drive at 60 km/h (38MPH) or more for 3 minutes or more.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “C1923” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-117, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000958878

1.

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

 With CONSULT-III

 Perform ABS actuator and electric 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 “C1923” detected?

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "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?

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

C1923

STEERING ANGLE SEN
[NO CHANGE]

Malfunction is detected in steering angle sensor signal 
that is output from steering angle sensor with CAN 
communication.
[Steering angle sensor input signal error is detected 
when driving at 60 km/h (37MPH) or more.]

Steering angle sensor in-
put signal error