Infiniti G37 Coupe. Manual - part 1272

POWER STEERING SOLENOID VALVE

STC-139

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

3.

CHECK POWER STEERING SOLENOID VALVE

1.

Check the resistance between power steering solenoid valve connector terminals.

2.

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"

.

Component Inspection

INFOID:0000000001666474

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.

ST-26, "Exploded View"

.

Power steering solenoid valve

Resistance (Approx.)

Connector

Terminal

F45

1 – 2

4 – 6 

Ω

Power steering solenoid valve

Resistance (Approx.)

Connector

Terminal

F45

1 – 2

4 – 6 

Ω

STC-140

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

4WAS WARNING LAMP

4WAS WARNING LAMP

Description

INFOID:0000000001666475

• Turn 4WAS warning lamp ON when ignition switch turns ON from OFF. Then, turn 4WAS warning lamp OFF

after the engine is started.

• The check of 4WAS system is performed.
• 4WAS system stops (error) when turning 4WAS warning lamp ON.

Diagnosis Procedure

INFOID:0000000001666476

1.

PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS 

With CONSULT-III

 Perform the self-diagnosis of the unified meter and A/C amp.

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is DTC “U1000” or “U1010” detected?

YES

>> Check the error system.

NO

>> GO TO 3.

3.

PERFORM COMBINATION METER CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect the unified meter and A/C amp. harness connector.

3.

Disconnect the combination meter harness connector.

4.

Check the continuity between the unified meter and A/C amp. harness connector and the combination
meter harness connector terminal.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the harnesses and connectors.

4.

CHECK 4WAS WARNING LAMP SIGNAL

With CONSULT-III

1.

Connect the unified meter and A/C amp. harness connector.

2.

Connect the combination meter harness connector.

3.

Disconnect 4WAS front control unit harness connector.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check “WARNING LAMP” item on DATA MONITOR of 4WAS main control unit.

Does the item on “DATA MONITOR” indicate “On”?

YES

>> GO TO 5.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

5.

CHECK COMBINATION METER

With CONSULT-III

Unified meter and A/C amp.

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

M66

7

M53

3

Existed

M66

27

M53

2

4WAS WARNING LAMP

STC-141

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Perform the trouble diagnosis of the combination meter. Refer to 

MWI-50, "COMBINATION METER : Diagno-

sis Procedure"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the combination meter. Refer to 

MWI-160, "Exploded View"

.

Special Repair Requirement

INFOID:0000000001666477

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit

after diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

STC-142

< ECU DIAGNOSIS >

[WITH 4WAS]

4WAS FRONT CONTROL UNIT

ECU DIAGNOSIS

4WAS FRONT CONTROL UNIT

Reference Value

INFOID:0000000001666478

VALUES ON THE DIAGNOSIS TOOL

CONSULT-III MONITOR ITEM

Monitor item

Condition

Value/Status

4WAS STR ANG

Steering wheel turned right

Approx. 0 – 550 deg

Straight-ahead

Approx. 0 deg

Steering wheel turned left

Approx. 0 – 

−

550 deg

VEHICLE SPEED

Vehicle stopped

0 km/h (0 MPH)

Vehicle running

CAUTION:

Check air pressure of tire under standard conditions.

Approximately equal to the indi-
cation on speedometer (Inside 
of 

±

10%)

MOTOR CURRENT

The steering wheel is not steered.

Approx. 0 – 1 A

The steering wheel is steering.

Approx. 0 – 60 A

MTR CRNT ESTM

The steering wheel is not steered.

Approx. 0 – 1 A

The steering wheel is steering.

Approx. 0 – 60 A

ACTR ROTA ANG

Steering wheel turned to the right (with vehicle stopped).

Approx. 0 – 60 deg

Straight-ahead

Approx. 0 deg

Steering wheel turned to the left (with vehicle stopped).

Approx. 0 – 

−

60 deg

LG VOLT

Ignition switch: ON

Engine running (idling)

Approx. 0 – 16 V

THERM TEMP

Engine running (idling)

−

40 – 100

°

C

MOTOR VOLT

Ignition switch: ON

Engine running (idling)

Battery voltage

Engine stopped.

Battery voltage

IGN VOLT

Ignition switch: ON

Engine running (idling)

Battery voltage

Engine stopped.

Battery voltage

ACTR ANG COMM

Steering wheel turned to the right (with vehicle stopped).

Approx. 0 – 60 deg

Straight-ahead

Approx. 0 deg

Steering wheel turned to the left (with vehicle stopped).

Approx. 0 – 

−

60 deg

ACTR ROTA SPD

The steering wheel is not steered.

0 deg/s

The steering wheel is steering.

Other than 0 deg/s

DUTY COMMAND

Ignition switch: ON

Engine running (idling)

0 – 100%

LOCK DTY COMM

Ignition switch: ON

Engine running (idling)

0 – 100%

MTR U VOLT

Ignition switch: ON

Engine running (idling)

Approx. 0 – 20 V

Engine stopped.

0 V

MTR V VOLT

Ignition switch: ON

Engine running (idling)

Approx. 0 – 20 V

Engine stopped.

0 V

MTR W VOLT

Ignition switch: ON

Engine running (idling)

Approx. 0 – 20 V

Engine stopped.

0 V

ACT TEMP ESTM

Engine running (idling)

−

40 – 100

°

C

MTR PHZ CRNT

The steering wheel is steering.

Approx. 0 – 20 A

ACTR DEVI ANG

The steering wheel is steering.

Approx. 

−

10 – 10 deg