Infiniti Q45. Manual — part 896

TROUBLE DIAGNOSIS FOR SYMPTOMS

STC-87

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

The Steering Force of Steering Wheel Is Not Changed Smoothly According to
the Vehicle Speed

NGS00093

SYMPTOM:

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).

DIAGNOSTIC PROCEDURE

1.

CHECK SYSTEM FOR VEHICLE SPEED SENSOR

Perform trouble diagnosis for vehicle speed sensor system. Refer to

STC-72, "DTC C1919 VEHICLE SPEED

SEN"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace damaged parts.

2.

CHECK SYSTEM FOR STOP LAMP SWITCH

Perform trouble diagnosis for stop lamp switch. Refer to

STC-80, "Stop Lamp Switch"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE

Perform trouble diagnosis for power steering solenoid valve system. Refer to

STC-77, "Power Steering Sole-

noid Valve"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

CHECK SYSTEM FOR RAS ACTUATOR ASSEMBLY

Perform trouble diagnosis for RAS actuator assembly system. Refer to

STC-76, "RAS Actuator Assembly"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

5.

CHECK RAS CONTROL UNIT

Check RAS control unit input/output signal. Refer to

STC-47, "RAS Control Unit Input/Output Signal Refer-

ence Values"

.

OK or NG

OK

>> GO TO 6.

NG

>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

6.

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace RAS control unit. Refer to

STC-90, "Removal and Installation"

.

STC-88

[WITH REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYMPTOMS

Hard Steering When Fully Turning the Steering Wheel

NGS0008Y

DIAGNOSTIC PROCEDURE

1.

CHECK SYSTEM FOR VEHICLE SPEED SENSOR

Perform trouble diagnosis for vehicle speed sensor system. Refer to

STC-72, "DTC C1919 VEHICLE SPEED

SEN"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace damaged parts.

2.

CHECK SYSTEM FOR STOP LAMP SWITCH

Perform trouble diagnosis for stop lamp switch. Refer to

STC-80, "Stop Lamp Switch"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE

Perform trouble diagnosis for power steering solenoid valve system. Refer to

STC-77, "Power Steering Sole-

noid Valve"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

CHECK RAS CONTROL UNIT

Check RAS control unit input/output signal. Refer to

STC-47, "RAS Control Unit Input/Output Signal Refer-

ence Values"

.

OK or NG

OK

>> GO TO 5.

NG

>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

5.

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace RAS control unit. Refer to

STC-90, "Removal and Installation"

.

TROUBLE DIAGNOSIS FOR SYMPTOMS

STC-89

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

Light Steering When Driving at a High Speed

NGS0008Z

DIAGNOSTIC PROCEDURE

1.

CHECK SYSTEM FOR VEHICLE SPEED SENSOR

Perform trouble diagnosis for vehicle speed sensor system. Refer to

STC-72, "DTC C1919 VEHICLE SPEED

SEN"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace damaged parts.

2.

CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE

Perform trouble diagnosis for power steering solenoid valve system. Refer to

STC-77, "Power Steering Sole-

noid Valve"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

CHECK RAS CONTROL UNIT

Check RAS control unit input/output signal. Refer to

STC-47, "RAS Control Unit Input/Output Signal Refer-

ence Values"

.

OK or NG

OK

>> GO TO 4.

NG

>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

4.

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace RAS control unit. Refer to

STC-90, "Removal and Installation"

.

STC-90

[WITH REAR ACTIVE STEER]

CONTROL UNIT

CONTROL UNIT

PFP:28400

Removal and Installation

NGS0006Y

REMOVAL

1.

Turn the ignition switch OFF and disconnect the battery cable from the negative terminal.

2.

Remove the trunk side finisher. Refer to

EI-60, "Removal and Installation"

.

3.

Disconnect the RAS control unit connector.

4.

Remove the RAS control unit bolts.

5.

Remove the RAS control unit (1).

INSTALLATION

Note the following, and installation is the reverse order of removal.

●

When installing the RAS control unit, tighten bolts to the specified torque.

SGIA1422E

RAS control unit bolts

: 8.3 N·m (0.85 kg-m, 73 in-lb)