Infiniti G35 (V35). Manual - part 784

STC-40

[RAS]

TROUBLE DIAGNOSIS

2. 

CHECK RAS WARNING LAMP HARNESS

1.

Turn ignition switch OFF, disconnect RAS control unit harness connector and combination meter harness
connector.

2.

Check continuity between the following terminals.

–

RAS control unit harness connector B136 terminal 26 and com-
bination meter harness connector M19 terminal 36.

3.

Check continuity between RAS control unit harness connector
and ground.

–

RAS control unit harness connector B136 terminal 26 and
ground.

OK or NG

OK

>> GO TO combination meter power supply circuit.

NG

>> Harness between RAS control unit and combination

meter open or shorted. Repair or replace harness.

Continuity should exist.

SGIA1514E

Continuity should exist.

SGIA1280E

TROUBLE DIAGNOSIS

STC-41

[RAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

Diagnosis Chart by Symptom 1

NGS000A0

1. 

CHECK SELF-DIAGNOSTIC RESULTS

Perform RAS self-diagnosis.

●

With CONSULT-II: 

STC-23, "Self-Diagnosis"

●

Without CONSULT-II: 

STC-26, "Diagnosis Procedure With Self-Diagnosis Function (Without CONSULT-

II)"

Are malfunctioning items displayed in self-diagnosis results?

YES

>> Repair or replace any malfunctioning items.

NO

>> GO TO 2.

2. 

CHECK RAS STATIC/DYNAMIC CHARACTERISTICS

Check RAS static/dynamic characteristics. Refer to 

STC-43, "Check RAS Static/Dynamic Characteristics"

 .

Is the malfunction corrected?

YES

>> INSPECTION END

NO

>> Perform the following check, and then check the symptom again.

●

Adjust neutral position of steering angle sensor. Refer to 

BRC-6, "Adjustment of Steering Angle

Sensor Neutral Position"

 .

●

Steering angle sensor mounting condition. Refer to 

BRC-63, "STEERING ANGLE SENSOR"

 .

Diagnosis Chart by Symptom 2

NGS000A1

The steering force does not change smoothly according to the vehicle speed (Heavy steering force with the
vehicle stopped/Light handle operation during high-speed driving)

1. 

CHECK (1): POWER STEERING SOLENOID VALVE SIGNAL

1.

Start engine.

2.

Change the vehicle speed from 0 to 100 km/h (0 to 62 MPH)
slowly, and then check voltage RAS control unit harness con-
nector B136.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 7.

2. 

CHECK (2): POWER STEERING SOLENOID VALVE SIGNAL

1.

Activate fail-safe function by running engine speed at 1,500 rpm or higher for 10 seconds with the vehicle
stopped.

2.

Change the engine speed to the idling speed, approx. 1,600
rpm, and approximately 3,000 rpm slowly, and then check volt-
age RAS control unit harness connector B136.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 7.

Terminal 36 – 34

: The voltage has changed from 
approximately 4.4 - 6.6 V to approxi-
mately 2.4 - 3.6 V.

SGIA1281E

Terminal 36 – 34

: The voltage is changed from 
approximately 5.5 V to approximately 
2.1 V step-by-step.

SGIA1281E

STC-42

[RAS]

TROUBLE DIAGNOSIS

3. 

CHECK POWER STEERING SOLENOID VALVE CONNECTOR

Turn ignition switch OFF, disconnect power steering solenoid valve harness connector, and check terminal for
deformation, disconnection, looseness, etc.

OK or NG

OK

>> GO TO 4.

NG

>> Harness or connector open or shorted. Repair or replace any inoperative parts.

4. 

CHECK POWER STEERING SOLENOID VALVE POWER SUPPLY CIRCUIT

Check continuity between RAS control unit harness connector (A)
B136 and power steering solenoid valve harness connector (B) F8.

OK or NG

OK

>> GO TO 5.

NG

>> Open or short in harness. Repair or replace any inoper-

ative parts.

5. 

CHECK POWER STEERING SOLENOID VALVE GROUND CIRCUIT

Check continuity between power steering solenoid valve harness
connector (A) and ground.

OK or NG

OK

>> GO TO 6.

NG

>> Open or short in harness. Repair or replace any inoper-

ative parts.

6. 

CHECK POWER STEERING SOLENOID VALVE

Apply voltage power steering solenoid valve connector F8 (A) and
then make sure that the operating sound (clicking sound) is heard.

OK or NG

OK

>> Perform steering turning torque inspection. Refer to 

PS-

9, "CHECKING STEERING WHEEL TURNING
FORCE"

 .

NG

>> Power steering solenoid valve is inoperating. Replace it.

7. 

CHECK SELF-DIAGNOSIS RESULTS

Perform RAS self-diagnosis.

●

With CONSULT-II: 

STC-23, "Self-Diagnosis"

●

Without CONSULT-II: 

STC-26, "Diagnosis Procedure With Self-Diagnosis Function (Without CONSULT-

II)"

Are malfunctioning items displayed in self-diagnosis results?

YES

>> Repair or replace any malfunctioning items.

NO

>> RAS control unit malfunction. Replace it.

RAS control unit

Power steering solenoid valve

Continuity

36

Terminal 1

Yes

SGIA1735E

Connector

Terminal

Continuity

F8

2 

−

 Ground

Yes

SGIA1516E

Terminal 1 (+) - 2 (-)

: Operating sound is heard.

SGIA1517E

TROUBLE DIAGNOSIS

STC-43

[RAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

Check RAS Static/Dynamic Characteristics

NGS000A2

1. 

CHECK (1): RAS ACTUATOR STROKE

Perform CONSULT-II “ACTIVE TEST”, and then check the actuator
stroke when turning the steering wheel clockwise or counterclock-
wise by 180

°

 or more.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

CHECK (2): RAS ACTUATOR STROKE

Perform CONSULT-II “ACTIVE TEST“. When turning the steering
wheel in neutral position (A), the rear wheel turns clockwise/counter-
clockwise periodically. At that time, check actuator stroke (B).

OK or NG

OK

>> RAS static/dynamic characteristics inspection is com-

pleted.

NG

>> GO TO 3.

3. 

CHECK RAS MOTOR

Check RAS motor itself separated from other parts. Refer to 

STC-44, "RAS MOTOR"

 .

OK or NG

OK

>> GO TO 4.

NG

>> RAS motor malfunction. Check the stroke again after replacing.

4. 

CHECK REAR WHEEL STEERING ANGLE SENSOR

Check rear wheel steering angle sensor separated from other parts. Refer to 

STC-44, "REAR WHEEL

STEERING ANGLE SENSOR"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Rear wheel steering angle sensor malfunction. Check the stroke again after replacing.

5. 

CHECK RAS CONTROL UNIT

Replace RAS control unit. Check the symptom of malfunction again.
Is the malfunction corrected?

YES

>> RAS control unit malfunction

NO

>> GO TO 6.

6. 

REPLACE RAS ACTUATOR ASSEMBLY

Replace RAS actuator assembly. Check the symptom of malfunction again.

Is the malfunction corrected?

YES

>> RAS actuator malfunction

NO

>> Check rear suspension components. Refer to 

RSU-7, "Components"

 .

Neutral position (A)

Actuator stroke (B)

: 2.8 - 3.0 mm (0.110 - 0.118 in)

SGIA1240E

Actuator stroke (B)

: 2.3 - 2.5 mm (0.091 - 0.098 in)

SGIA1240E