Nissan Maxima. Manual - part 1125

STC-6

< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000009466552

EPS system functions by ignition power supply.

Diagnosis Procedure

INFOID:0000000009466553

Regarding Wiring Diagram information, refer to 

STC-17, "Wiring Diagram"

.

1.

CHECK POWER SUPPLY

1. Turn the ignition switch OFF.

2. Disconnect power steering control unit connector.

3. Turn the ignition switch ON.

4. Check voltage between power steering control unit connector

M59 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connectors.

2.

CHECK GROUND CIRCUIT

1. Turn the ignition switch OFF.

2. Check continuity between power steering control unit connector

M59 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connectors.

3.

CHECK TERMINALS AND HARNESS CONNECTORS

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

YES

>> Inspection End

NO

>> Repair or replace damaged parts.

Power steering control unit

Ground

Condition

Voltage (Approx.)

Connector

Terminal

M59

3

—

Ignition switch ON

Battery voltage

Ignition switch OFF

0V

AWGIA0092ZZ

Power steering control unit

Ground

Continuity

Connector

Terminal

M59

6 —

Yes

AWGIA0034ZZ

POWER STEERING SOLENOID VALVE

STC-7

< DTC/CIRCUIT DIAGNOSIS >

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POWER STEERING SOLENOID VALVE

Description

INFOID:0000000009466554

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

Diagnosis Procedure

INFOID:0000000009466555

Regarding Wiring Diagram information, refer to 

STC-17, "Wiring Diagram"

.

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

1. Start engine.

2. Check voltage between power steering control unit connector

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 FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect power steering solenoid valve connector.

3. Disconnect power steering control unit connector.

4. Check continuity between power steering solenoid valve con-

nector E14 (A) terminals 1, 2 and power steering control unit

connector M59 (B) terminal 1, 5.

Is the inspection result normal?

 YES

>> GO TO 3.

 NO

>> Repair harness or connectors.

3.

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

TROL UNIT FOR SHORT

Power steering control unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M59

 1 

—

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

Yes

2

5

AWGIA0036ZZ

STC-8

< DTC/CIRCUIT DIAGNOSIS >

POWER STEERING SOLENOID VALVE

1. Check continuity between power steering solenoid valve con-

nector E14 terminals 1, 2 and ground.

2. Turn ignition switch ON.

3. Check voltage between power steering solenoid valve connector

E14 terminals 1, 2 and ground.

Is the inspection result normal?

 YES

>> GO TO 4.

 NO

>> Repair harness or connectors.

4.

CHECK POWER STEERING SOLENOID VALVE

Perform power steering solenoid valve component inspection. Refer to 

STC-8, "Component Inspection"

.

Is the inspection result normal?

 YES

>> GO TO 5.

 NO

>> Replace power steering solenoid valve. Refer to 

ST-33, "Exploded View"

.

5.

CHECK TERMINALS AND HARNESS CONNECTORS

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

2. Check power steering solenoid valve pin terminals for damage or loose connection with harness connec-

tor.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000009466556

1.

POWER STEERING SOLENOID VALVE RESISTANCE CHECK

1. Turn ignition switch OFF.

2. Disconnect power steering solenoid valve connector.

3. Check resistance between power steering solenoid valve termi-

nals 1 and 2 

Is the inspection result normal?

 YES

>> GO TO 2.

 NO

>> Replace power steering solenoid valve. Refer to 

ST-33,

"Exploded View"

.

2.

POWER STEERING SOLENOID VALVE OPERATION CHECK

Power steering solenoid valve

Ground

Continuity

Connector

Terminal

E14

1

—

No

2

AWGIA0093ZZ

Power steering solenoid valve

Ground

Voltage (Approx.)

Connector

Terminal

E14

1

—

0V

2

AWGIA0094ZZ

Power steering solenoid valve terminals

Resistance (Approx.)

1 - 2

5 

Ω

AWGIA0037ZZ

POWER STEERING SOLENOID VALVE

STC-9

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Check power steering solenoid valve by listening for its operation

sound while applying battery voltage to power steering solenoid

valve terminal 1 (positive) and battery ground to terminal 2 (nega-

tive).
Is the inspection result normal?

YES

>> Inspection End

NO

>> Replace power steering solenoid valve. Refer to 

ST-33,

"Exploded View"

.

AWGIA0038ZZ