Nissan Murano. Manual - part 1355

EPS SYSTEM

STC-5

< SYSTEM DESCRIPTION >

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Component Parts Location

INFOID:0000000009722591

Component Description

INFOID:0000000009722592

1.

Power steering solenoid valve

2.

Power steering control unit

A.

Steering gear assembly

B.

Glove box assembly removed

: Vehicle front

JSGIA0301ZZ

Component parts

Reference/Function

Power steering control unit

• Signals from various sensors control the driving voltage to the power steering solenoid valve.
• The power steering control unit controls the driving voltage to the power steering solenoid valve 

for maintaining the power steering assist force when the fail-safe function is activated. (The en-
gine speed signals control EPS system if any vehicle speed signal error is detected.)

Combination meter

STC-11, "Description"

ECM

STC-9, "Description"

Power steering solenoid valve

STC-7, "Description"

STC-6

< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000009722593

Power supply to EPS system

Diagnosis Procedure

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1.

CHECK POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect power steering control unit harness connector.

3.

Check voltage between power steering control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check voltage between power steering control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following. If any items are damaged, repair or replace damaged parts.

• 10A fuses (#3) open
- Harness for short or open between ignition switch and power steering control unit harness con-

nector No. 3 terminal.

- Ignition switch. Refer to 

PCS-68, "Component Inspection"

.

2.

CHECK GROUND CIRCUIT

1.

Turn the ignition switch OFF.

2.

Check continuity between power steering control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to power in 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

—

Voltage

(Approx.)

Connector

Terminal

M61

3 Ground

0 

V

Power steering control unit

—

Voltage

(Approx.)

Connector

Terminal

M61

3 Ground

Battery 

voltage

Power steering control unit

—

Continuity

Connector

Terminal

M61

6 Ground

Existed

POWER STEERING SOLENOID VALVE

STC-7

< DTC/CIRCUIT DIAGNOSIS >

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POWER STEERING SOLENOID VALVE

Description

INFOID:0000000009722595

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

Diagnosis Procedure

INFOID:0000000009722596

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

Check voltage between power steering control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

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 and the power steering
control unit harness connector.

5.

Check continuity between power steering control unit harness connector and ground.

Is the inspection result normal?

 YES

>> GO TO 3.

 NO

>> Repair or replace damaged parts.

3.

CHECK POWER STEERING SOLENOID VALVE

Check power steering solenoid valve. Refer to 

STC-8, "Component Inspection"

.

Is the inspection result normal?

 YES

>> GO TO 4.

 NO

>> Replace gear-sub assembly. Refer to 

ST-46, "Exploded View"

 (With heated steering wheel), 

ST-

88, "Exploded View"

 (Without heated steering wheel).

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?

Power steering control unit

—

Condition

Voltage

(Approx.)

Connector

Terminal

M61

 1 

Ground

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

4.4 – 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 – 3.6 V

Power steering solenoid valve

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

E52

1

M61

1

Existed

E52

2

M61

5

Existed

Power steering control unit

—

Continuity

Connector

Terminal

M61

1

Ground

Not existed

M61

5

STC-8

< DTC/CIRCUIT DIAGNOSIS >

POWER STEERING SOLENOID VALVE

YES

>> INSPECTION END

NO

>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000009722597

1.

CHECK POWER STEERING SOLENOID VALVE

1.

Turn the ignition switch OFF.

2.

Disconnect power steering solenoid valve harness connector.

3.

Check resistance between power steering solenoid valve connector terminals.

4.

Check power steering solenoid valve by listening for its operation sound while applying battery voltage to
power steering solenoid valve connector E52 terminals 1 (positive) and 2 (negative).

Is the inspection result normal?

 YES

>> INSPECTION END

 NO

>> Replace gear-sub assembly. Refer to 

ST-46, "Exploded View"

 (With heated steering wheel), 

ST-

88, "Exploded View"

 (Without heated steering wheel).

Power steering solenoid valve

Resistance (Approx.)

Terminal

1 2

4 

– 

6 

Ω