Infiniti Q45. Manual - part 894

 

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Infiniti Q45. Manual - part 894

 

 

TROUBLE DIAGNOSIS FOR SYSTEM

STC-79

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

3. 

CHECK POWER STEERING SOLENOID VALVE

1.

Turn ignition switch “OFF”.

2.

Disconnect power steering solenoid valve harness connector.

3.

Check resistance between power steering solenoid valve con-
nector (A) terminals 1 and 2.

4.

Check power steering solenoid valve connector (A) by listening
for its operation sound while applying battery voltage to power
steering solenoid valve connector (A) terminals 1 (positive) and
2 (negative).

 OK or NG

 OK 

>> GO TO 4.

 NG

>> Replace power steering solenoid valve. Refer to 

PS-17,

"COMPONENT"

 .

4. 

CHECK HARNESS BETWEEN RAS CONTROL UNIT AND POWER STEERING SOLENOID VALVE

1.

Turn ignition switch “OFF”.

2.

Disconnect RAS control unit harness connector and power steering solenoid valve harness connector.

3.

Check continuity between RAS control unit harness connector
(A) B39 terminal 36 and power steering solenoid valve harness
connector (B) F3 terminal 1.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 5.

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 item is damaged, repair or replace damaged parts.

1 - 2

: Approx. 4 - 6 

SGIA1412E

SGIA1419E

Continuity should exist.

SGIA1490E

STC-80

[WITH REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYSTEM

6. 

CHECK STEERING WHEEL TURNING FORCE

Check steering wheel turning force. Refer to 

PS-8, "STEERING WHEEL TURNING FORCE"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Check relief oil pressure of power steering oil pump and power steering gear. If any item is dam-

aged, repair or replace damaged parts. Refer to 

PS-26, "RELIEF OIL PRESSURE"

  (power steer-

ing oil pump) an

PS-28, "Disassembly and Assembly"

  (power steering gear).

Stop Lamp Switch

NGS0008Q

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Data are reference value.

RAS CONTROL UNIT TERMINALS AND REFERENCE VALUE

Data are reference value and are measured between each terminal and ground.

CAUTION:

When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminal.

DIAGNOSTIC PROCEDURE

1. 

CHECK STOP LAMP SIGNAL

 With CONSULT-II

1.

Start engine.

2.

Select “DATA MONITOR” mode for “RAS/HICAS” with CONSULT-II.

3.

Read out the value of “STOP LAMP SW”.

 Without CONSULT-II

1.

Start engine.

2.

Check signal between RAS control unit harness connector (A)
terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 2.

Monitored item

Content

Condition

Display value

STOP LAMP SW [ON/OFF]

Stop lamp condition

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

Terminal

Wire 

color

Item

Condition

Data (Approx.)

22

L/B

Stop lamp switch

Brake pedal: Depressed

Battery voltage

Brake pedal: Released

0 V

Condition

Display value

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

SGIA1491E

Connector

Terminal

Condition

Data (Approx.)

B39

 22 - 

Ground

Brake pedal: Depressed

Battery voltage

Brake pedal: Released

0 V

SGIA1492E

TROUBLE DIAGNOSIS FOR SYSTEM

STC-81

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

2. 

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect stop lamp switch harness connector.

3.

Turn ignition switch “ON”. (Do not start engine.)

4.

Check voltage between stop lamp switch harness connector (A)
M402 terminal 3 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Check the following. If any items are damaged, repair or 

replace damaged parts.

10A fuse [No. 17, located in the fuse block (J/B)
No.1]. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

Harness for short or open between battery and stop lamp switch harness connector M402 ter-
minal 3.

3. 

CHECK HARNESS BETWEEN RAS CONTROL UNIT AND STOP LAMP SWITCH

1.

Turn ignition switch “OFF”.

2.

Disconnect RAS control unit harness connector and stop lamp switch harness connector.

3.

Check continuity between RAS control unit harness connector
(A) B39 terminal 22 and stop lamp switch harness connector (B)
M402 terminal 4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK STOP LAMP SWITCH 

1.

Turn ignition switch “OFF”.

2.

Disconnect stop lamp switch harness connector.

3.

Remove stop lamp switch.

4.

Push and release stop lamp switch and check continuity
between stop lamp switch connector (A) M402 terminals 3 and
4.

OK or NG

OK

>> GO TO 5.

NG

>> Replace back-up lamp switch.

Connector

Terminal

Voltage (Approx.)

M402

3 - Ground

Battery voltage

SGIA1493E

Continuity should exist.

SGIA1495E

Terminal

Condition

Continuity

3 - 4

Push stop lamp switch

Yes

Release stop switch

No

SGIA1497E

STC-82

[WITH REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYSTEM

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

>> INSPECTION END

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.

Component Inspection

NGS000CU

RAS MOTOR

1.

Turn ignition switch “OFF”.

2.

Disconnect RAS motor harness connector.

3.

Remove RAS motor. Refer to 

STC-92, "COMPONENTS"

 .

4.

Check operation by supply 6 V (B) voltage to RAS motor con-
nector (A) terminals 1 and 2.

CAUTION:

Never supply 12 V voltage (battery, etc.) to the RAS
motor.

Never operate RAS motor for more than 1 second.

Be careful not to overheat the harness.

5.

Check continuity between RAS motor connector (A) B82 termi-
nals 1 and 2.

6.

If NG, replace the RAS motor.

RAS MOTOR RELAY

1.

Turn ignition switch “OFF”.

2.

Remove RAS motor relay. Refer to 

STC-41, "Component Parts Location"

 .

3.

Apply 12 V direct current between RAS motor relay connector
B42 terminals 1 and 2.

4.

Check continuity between RAS motor relay connector B42 ter-
minals 3 and 5.

5.

Check continuity between RAS motor relay connector B42 ter-
minals 1 and 2.

6.

If NG, replace the RAS motor relay.

Terminal

Actuator motor

1 (Positive) - 2 (Negative)

Clockwise rotate

2 (Positive) - 1 (Negative)

Counterclockwise rotate

1 – 2

: Approx. 0.45 

SGIA1473E

SGIA1474E

Terminal

Condition

Continuity

3 - 5

1 2 V direct current supply between terminals 1 and 2

Yes

OFF

No

1 – 2

: 74 

SGIA1286E

 

 

 

 

 

 

 

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