Nissan Altima L32. Manual - part 1397

POWER SUPPLY AND GROUND CIRCUIT

STC-7

< COMPONENT DIAGNOSIS >

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A

B

STC

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Is the inspection result normal?

YES

>> Inspection End

NO

>> Repair or replace damaged parts.

STC-8

< COMPONENT DIAGNOSIS >

POWER STEERING SOLENOID VALVE

POWER STEERING SOLENOID VALVE

Description

INFOID:0000000004205830

• Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.

Diagnosis Procedure

INFOID:0000000004205831

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

1. Start engine.

2. Check voltage between power steering control unit harness con-

nector M59 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK HARNESS BETWEEN POWER STEERING SOLENOID VALVE AND POWER STEERING CON-

TROL UNIT
1. Turn the ignition switch OFF.

2. Disconnect power steering solenoid valve harness connector.

3. Disconnect power steering control unit harness connector.

4. Check the continuity between power steering solenoid valve

harness connector E14 (A) terminal 1 and 2 and the power

steering control unit harness connector M59 (B) terminal 1 and

5.

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

Is the inspection result normal?

 YES

>> GO TO 3.

 NO

>> Repair or replace damaged parts.

3.

CHECK POWER STEERING SOLENOID VALVE

1. Check resistance between power steering solenoid valve termi-

nals.

Power steering control unit

Value (Approx.)

Connector

Terminal

Condition

M59

 1 - Ground

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

4.4 - 6.6 V

Vehicle speed: 100 km/h (62 
MPH)

2.5 - 3.7 V

AWGIA0108ZZ

Power steering solenoid valve

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

E14 (A)

1

M59 (B)

1

Existed

2

5

Existed

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Power steering solenoid valve

Resistance (Approx.)

Terminal

1 - 2

5 

Ω

AWGIA0037ZZ

POWER STEERING SOLENOID VALVE

STC-9

< COMPONENT DIAGNOSIS >

C

D

E

F

H

I

J

K

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A

B

STC

N

O

P

2. Check power steering solenoid valve by listening for its opera-

tion sound while applying battery voltage to power steering sole-

noid valve terminal 1 (positive) and battery ground to terminal 2

(negative).

Is the inspection result normal?

 YES

>> GO TO 4.

 NO

>> Replace power steering solenoid valve. Refer to 

ST-28,

"Exploded View"

.

4.

CHECK TERMINALS AND HARNESS CONNECTORS

• Check power steering control unit pin terminals for damage or loose connection with harness connector.

• Check power steering solenoid valve pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Inspection End

NO

>> Repair or replace damaged parts.

AWGIA0038ZZ

STC-10

< COMPONENT DIAGNOSIS >

ENGINE SPEED SIGNAL CIRCUIT

ENGINE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000004205832

• ECM sends engine speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000004205833

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT-III

Perform ECM self-diagnosis.
Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT

1. Turn the ignition switch OFF.

2. Disconnect ECM harness connector E10.

3. Disconnect power steering control unit harness connector.

4. Check continuity between ECM harness connector E10 (A) ter-

minal 94 and power steering control unit harness connector M59

(B) terminal 10.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK ENGINE SPEED SIGNAL (ECM SIDE)

1. Turn the ignition switch OFF.

2. Connect ECM harness connector.

3. Check signal between ECM harness connector E10 terminal 94

and ground with oscilloscope.

ECM

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

E10 (A)

94

M59 (B)

10

Existed

AWGIA0039ZZ

AWGIA0040ZZ