Infiniti FX35, FX50 (S51). Manual - part 1785

 

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Infiniti FX35, FX50 (S51). Manual - part 1785

 

 

POWER SUPPLY AND GROUND CIRCUIT

STC-81

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

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STC

N

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P

POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000005549735

Supplies power to RAS control unit.

Diagnosis Procedure

INFOID:0000000005549736

1.

CHECK RAS CONTROL UNIT POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect RAS control unit harness connector.

3.

Check the voltage between RAS control unit harness connectors and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between RAS control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, RAS control unit harness connector No. 27 terminal and

the ground

• Open between the ignition switch and RAS control unit harness connector No. 27 terminal
• Ignition switch

2.

CHECK RAS MOTOR POWER SUPPLY CIRCUIT (1)

1.

Turn the ignition switch OFF.

2.

Remove RAS motor relay.

3.

Check the continuity between RAS motor relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the harnesses and connectors.

3.

CHECK RAS MOTOR POWER SUPPLY CIRCUIT (2)

Check the voltage between RAS motor relay harness connector and ground.

Is the inspection result normal?

RAS control unit

Voltage (Approx.)

Connector

Terminal

B37

27

Ground

0 V

RAS control unit

Voltage (Approx.)

Connector

Terminal

B37

27

Ground

Battery voltage

RAS motor relay

Continuity

Connector

Terminal

B36

2

Ground

Existed

1

Not existed

RAS motor relay

Voltage (Approx.)

Connector

Terminal

B36

3 Ground

Battery 

voltage

STC-82

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

POWER SUPPLY AND GROUND CIRCUIT

YES

>> GO TO 4.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 20A fuse (#37) open
- Short among 20A fuse (#37) connector, RAS motor relay harness connector No. 3 terminal and

the ground

• Open between the battery and RAS motor relay harness connector No. 3 terminal

4.

CHECK RAS MOTOR POWER SUPPLY CIRCUIT (3)

1.

Connect RAS control unit harness connector.

2.

Install RAS motor relay.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between RAS control unit harness connector and ground.

5.

Turn the ignition switch OFF.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

5.

CHECK RAS MOTOR RELAY

Check the RAS motor relay. Refer to 

STC-54, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace RAS motor relay.

6.

CHECK RAS MOTOR POWER SUPPLY

1.

Connect RAS control unit harness connector.

2.

Install RAS motor relay.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between RAS control unit harness connectors and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

RAS control unit

Voltage (Approx.)

Connector

Terminal

B37

25

Ground

Battery voltage

RAS control unit

Voltage (Approx.)

Connector

Terminal

B37

37

Ground

Battery voltage

POWER STEERING SOLENOID VALVE

STC-83

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

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STC

N

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POWER STEERING SOLENOID VALVE

Description

INFOID:0000000005549739

The power steering oil pressure in the gear housing assembly is controlled. 

Diagnosis Procedure

INFOID:0000000005549740

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

With CONSULT-III

1.

Start the engine.

2.

Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.

3.

Check “POWER STR SOL” item on “DATA MONITOR” of RAS control unit.

Without CONSULT-III

1.

Start the engine.

2.

Check the voltage between RAS control unit harness connector and ground.

3.

Check that there is no malfunction in RAS control unit harness connector or disconnection.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

2.

CHECK POWER STEERING SOLENOID VALVE CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect RAS control unit harness connector.

3.

Disconnect the power steering solenoid valve harness connector.

4.

Check the continuity between RAS control unit harness connector and power steering solenoid valve har-
ness connector.

5.

Check the continuity between power steering solenoid valve harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the harnesses and connectors.

3.

CHECK POWER STEERING SOLENOID VALVE

Monitor item

Condition

Display value

POWER STR SOL

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

Approx. 1.10 A

Vehicle speed: 100 km/h (62 MPH)

Approx. 0.42 A

RAS control unit

Data (Approx.)

Connector

Terminal

Condition

B37

36

Ground

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

4.4 – 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 – 3.6 V

RAS control unit

Power steering solenoid valve

Continuity

Connector

Terminal

Connector

Terminal

B37

36

F45

1

Existed

Power steering solenoid valve

Continuity

Connector

Terminal

F45

2

Ground

Existed

STC-84

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

POWER STEERING SOLENOID VALVE

Check the power steering solenoid valve. Refer to 

STC-84, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair the steering gear. Refer to 

ST-26, "Exploded View"

.

Component Inspection

INFOID:0000000005549741

1.

POWER STEERING SOLENOID VALVE INSPECTION

1.

Turn the ignition switch OFF.

2.

Disconnect the power steering solenoid valve harness connector.

3.

Check the resistance between power steering solenoid valve connector terminals.

4.

Check for click sound (power steering solenoid valve activation sound) when applying approximately 12 V
between the power steering solenoid valve connector terminals.

CAUTION:

• Never make the terminals short.
• Assign the positive terminal to No. 1 terminal, and the negative terminal to No. 2 terminal. Con-

nect the fuse between the terminals when applying the voltage.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair the steering gear. Refer to 

ST-26, "Exploded View"

.

Power steering solenoid valve

Resistance (Approx.)

Terminal

1

2

4 – 6 

 

 

 

 

 

 

 

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