Infiniti G37 Coupe. Manual - part 1271

 

  Index      Infiniti     Infiniti G37 Coupe - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  1269  1270  1271  1272   ..

 

 

Infiniti G37 Coupe. Manual - part 1271

 

 

POWER SUPPLY AND GROUND CIRCUIT

STC-135

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

• Open between the battery and 4WAS rear motor relay harness connector No. 3 terminal

4.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3)

1.

Remove the noise suppressor.

2.

Check continuity between the noise suppressor harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace the harnesses and connectors.

5.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (4)

1.

Connect 4WAS main control unit harness connector.

2.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

3.

Check the voltage between 4WAS main control unit harness connectors.

4.

Turn the ignition switch OFF.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

6.

CHECK 4WAS REAR MOTOR RELAY

1.

Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:

• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.

2.

Check the continuity between 4WAS rear motor relay connector terminals.

3.

Check the resistance between 4WAS rear motor relay connector terminals.

Is the inspection result normal?

YES

>> GO TO 7.

Noise suppressor

Continuity

Connector

Terminal

B51

3 – Ground

Not existed

5 – Ground

B52

1 – Ground

Not existed

2 – Ground

Existed

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

25 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

Condition

B53

3 – 5

Apply the voltage between 

No. 1 terminal and No. 2 ter-

minal.

Existed

Do not apply the voltage be-

tween No. 1 terminal and 

No. 2 terminal.

Not existed

4WAS rear motor relay

Resistance (Approx.)

Connector

Terminal

B53

1 – 2

50 

STC-136

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

POWER SUPPLY AND GROUND CIRCUIT

NO

>> Replace 4WAS rear motor relay.

7.

CHECK NOISE SUPPRESSOR

Check continuity between the noise suppressor connector terminals.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace the noise suppressor.

8.

CHECK 4WAS REAR MOTOR POWER SUPPLY

1.

Connect 4WAS main control unit harness connector.

2.

Install 4WAS rear motor relay.

3.

Install the noise suppressor.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS main control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

Component Inspection (4WAS Rear Motor Relay)

INFOID:0000000001666470

1.

CHECK 4WAS REAR MOTOR RELAY

1.

Turn the ignition switch OFF.

2.

Remove 4WAS rear motor relay connector.

3.

Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:

• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.

4.

Check the continuity between 4WAS rear motor relay connector terminals.

5.

Check the resistance between 4WAS rear motor relay connector terminals.

Noise suppressor

Continuity

Connector

Terminal

Connector

Terminal

B51

3

B52

1

Existed

B51

3

B51

5

Not existed

B51

3

B52

2

Not existed

B51

5

B52

2

Existed

B51

5

B52

1

Not existed

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

37 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

Condition

B53

3 – 5

Apply the voltage between 
No. 1 terminal and No. 2 ter-
minal.

Existed

Do not apply the voltage be-
tween No. 1 terminal and 
No. 2 terminal.

Not existed

POWER SUPPLY AND GROUND CIRCUIT

STC-137

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace 4WAS rear motor relay.

Component Inspection (Noise Suppressor)

INFOID:0000000001666471

1.

NOISE SUPPRESSOR INSPECTION

1.

Turn the ignition switch OFF.

2.

Remove the noise suppressor.

3.

Check continuity between the noise suppressor connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the noise suppressor.

4WAS rear motor relay

Resistance (Approx.)

Connector

Terminal

B53

1 – 2

50 

Noise suppressor

Continuity

Connector

Terminal

Connector

Terminal

B51

3

B52

1

Existed

B51

3

B51

5

Not existed

B51

3

B52

2

Not existed

B51

5

B52

2

Existed

B51

5

B52

1

Not existed

STC-138

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

POWER STEERING SOLENOID VALVE

POWER STEERING SOLENOID VALVE

Description

INFOID:0000000001666472

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

Diagnosis Procedure

INFOID:0000000001666473

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

With CONSULT-III

1.

Start the engine.

2.

Check “POWER STR SOL” item on “DATA MONITOR” of 4WAS main control unit.

Without CONSULT-III

1.

Start the engine.

2.

Check the voltage between 4WAS main control unit harness connector and the ground.

3.

Check that there is no malfunction in 4WAS main control unit harness connector or disconnection.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

2.

CHECK POWER STEERING SOLENOID VALVE CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS main control unit harness connector.

3.

Disconnect the power steering solenoid valve harness connector.

4.

Check the continuity between 4WAS main control unit harness connector and power steering solenoid
valve harness connector.

5.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the harnesses and connectors.

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

4WAS main control unit

Data (Approx.)

Connector

Terminal

Condition

B54

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

4WAS main control unit

Power steering solenoid 

valve

Continuity

Connector

Terminal

Connector

Terminal

B54

36

F45

1

Existed

Power steering solenoid valve

Continuity

Connector

Terminal

F45

2 – Ground

Existed

 

 

 

 

 

 

 

Content   ..  1269  1270  1271  1272   ..