Murano Cross Cabriolet Z51 (2011 year). Manual - part 58

 

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Murano Cross Cabriolet Z51 (2011 year). Manual - part 58

 

 

SYSTEM

STC-5

< SYSTEM DESCRIPTION >

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• The valve driving voltage to control the power steering solenoid

valve varies according to the vehicle speed.

OPERATION PRINCIPLE

During Parking (When Turning The Steering Wheel To The Right.)

1.

Power steering solenoid valve is closed while a vehicle is stopped.

2.

Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.

3.

Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurred in “2R” and “3R”. This
results in a light steering force because of high pressure.

During High-speed Operation

1.

Power steering solenoid valve is opened during high-speed operation.

2.

Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.

3.

Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.

4.

Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a
heavy steering force.

EPS SYSTEM : Fail-Safe

INFOID:0000000007227506

EPS system

JSGIA0374GB

JSGIA0020GB

JSGIA0021GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-6

< SYSTEM DESCRIPTION >

SYSTEM

• EPS system enters the fail-safe mode (that allows the steering

force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 rpm or more for over 10 seconds while the vehicle is
stopped. This is normal.

• The fail-safe function is canceled when a vehicle speed signal of 2

km/h (1.2 MPH) or more is inputted or the ignition switch is turned
OFF

→

ON. EPS system restores the normal operation at that time.

JSGIA0368GB

Mode

Warn-

ing lamp

DTC

Detection point (malfunction part)

Error area and root cause

Fail-safe 

function

—

—

Vehicle speed signal input

• Engine speed is 1,500 rpm or more and there is no vehicle 

speed signal input for over 10 seconds during vehicle travel.

• Vehicle speed signal has abruptly dropped from 30 km/h (19 

MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.

Revision: 2012 March

2011 Murano CrossCabriolet

POWER STEERING CONTROL UNIT

STC-7

< ECU DIAGNOSIS INFORMATION >

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ECU DIAGNOSIS INFORMATION

POWER STEERING CONTROL UNIT

Reference Value

INFOID:0000000006935993

TERMINAL LAYOUT

PHYSICAL VALUES

JSGIA0023ZZ

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

1

(Y)

Ground

Power steering solenoid 
valve voltage

Output

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

3

(G)

Ground

Ignition switch power 
supply

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

5

(LG)

Ground

Power steering solenoid 
valve ground

—

Always

0  V

6

(B)

Ground

Ground

—

Always

0 V

8

(P)

Ground

Vehicle speed signal

Input

Vehicle speed: 40 km/h (25 MPH)

CAUTION:

Check air pressure of tire under 
standard condition.

NOTE:
The maximum voltage varies de-
pending on the specification 
(destination unit).

JSNIA0015GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-8

< ECU DIAGNOSIS INFORMATION >

POWER STEERING CONTROL UNIT

CAUTION:

When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly extend any connector ter-
minals.

Fail-Safe

INFOID:0000000006935995

EPS system

• EPS system enters the fail-safe mode (that allows the steering

force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 rpm or more for over 10 seconds while the vehicle is
stopped. This is normal.

• The fail-safe function is canceled when a vehicle speed signal of 2

km/h (1.2 MPH) or more is inputted or the ignition switch is turned
OFF

→

ON. EPS system restores the normal operation at that time.

10

(V)

Ground

Engine speed signal

Input

Engine is running
• Warm-up condition
• Idle speed

Engine is running
• Warm-up condition
• Engine speed: Approx. 2,000 rpm

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

JMBIA0076GB

JMBIA0077GB

JSGIA0368GB

Mode

Warn-

ing lamp

DTC

Detection point (malfunction part)

Error area and root cause

Fail-safe 

function

—

—

Vehicle speed signal input

• Engine speed is 1,500 rpm or more and there is no vehicle 

speed signal input for over 10 seconds during vehicle travel.

• Vehicle speed signal has abruptly dropped from 30 km/h (19 

MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.

Revision: 2012 March

2011 Murano CrossCabriolet

POWER STEERING CONTROL SYSTEM

STC-9

< WIRING DIAGRAM >

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WIRING DIAGRAM

POWER STEERING CONTROL SYSTEM

Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -

INFOID:0000000006935994

JCGWA0351GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-10

< WIRING DIAGRAM >

POWER STEERING CONTROL SYSTEM

JCGWA0352GB

Revision: 2012 March

2011 Murano CrossCabriolet

POWER STEERING CONTROL SYSTEM

STC-11

< WIRING DIAGRAM >

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JCGWA0353GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-12

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000006935979

DETAILED FLOW

1.

COLLECT THE INFORMATION FROM THE CUSTOMER

It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.

CAUTION:

Customers are not professional. It is dangerous to make an easy guess like “maybe the customer
means that...,” or “maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK THE STATUS

1.

Power steering fluid leakage and check the power steering fluid level. Refer to 

ST-29, "Inspection"

.

2.

Check the drive belt tension. Refer to 

EM-14, "Checking"

.

3.

Check the power steering gear for damages, cracks and fluid leakage. Refer to 

ST-47, "Inspection"

.

4.

Check the relief oil pressure. Refer to 

ST-53, "Inspection"

.

>> GO TO 3.

3.

DIAGNOSIS CHART BY SYMPTOM

Perform the diagnosis by symptom. Refer to 

STC-20, "Diagnosis Procedure"

.

>> GO TO 4.

4.

FINAL CHECK

Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?

YES

>> INSPECTION END

NO

>> GO TO 2.

Revision: 2012 March

2011 Murano CrossCabriolet

POWER SUPPLY AND GROUND CIRCUIT

STC-13

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000006935984

Power supply to EPS system

Diagnosis Procedure

INFOID:0000000006935985

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-71, "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

Revision: 2012 March

2011 Murano CrossCabriolet

STC-14

< DTC/CIRCUIT DIAGNOSIS >

POWER STEERING SOLENOID VALVE

POWER STEERING SOLENOID VALVE

Diagnosis Procedure

INFOID:0000000006935987

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-15, "Component Inspection"

.

Is the inspection result normal?

 YES

>> GO TO 4.

 NO

>> Replace gear-sub assembly. Refer to 

ST-39, "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.

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

Revision: 2012 March

2011 Murano CrossCabriolet

POWER STEERING SOLENOID VALVE

STC-15

< DTC/CIRCUIT DIAGNOSIS >

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Component Inspection

INFOID:0000000006935988

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-39, "Exploded View"

.

Power steering solenoid valve

Resistance

(Approx.)

Terminal

1 2

4 

– 

6 

Ω

Revision: 2012 March

2011 Murano CrossCabriolet

STC-16

< DTC/CIRCUIT DIAGNOSIS >

ENGINE SPEED SIGNAL CIRCUIT

ENGINE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000006935989

ECM sends engine speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000006935990

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine

2.

Perform “ENGINE” self-diagnosis. Refer to 

EC-64, "CONSULT Function"

.

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT

1.

Turn the ignition switch OFF.

2.

Disconnect ECM harness connectors.

3.

Disconnect power steering control unit harness connector.

4.

Check continuity between ECM harness connector and 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 ENGINE SPEED SIGNAL (1)

1.

Connect ECM harness connectors.

2.

Check signal between ECM harness connector and ground with oscilloscope.

ECM

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

E16

94

M61

10

Existed

Power steering control unit

—

Continuity

Connector

Terminal

M61

10

Ground

Not existed

Revision: 2012 March

2011 Murano CrossCabriolet

ENGINE SPEED SIGNAL CIRCUIT

STC-17

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace ECM. Refer to 

EC-127, "Description"

.

4.

CHECK ENGINE SPEED SIGNAL (2)

1.

Turn the ignition switch OFF.

2.

Connect power steering control unit harness connector.

3.

Check signal between power steering control unit harness connector and ground with oscilloscope.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace power steering control unit. Refer to 

STC-21, "Removal and Installation"

.

5.

CHECK TERMINALS AND HARNESS CONNECTORS

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

YES

>> INSPECTION END

NO

>> Repair or replace damaged parts.

ECM

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

E16

94

Ground

Engine is running
• Warm-up condition
• Idle speed

Engine is running
• Warm-up condition
• Engine speed: Approx. 2,000 rpm

JMBIA0076GB

JMBIA0077GB

Power steering control unit

—

Condition

Voltage

(Approx.)

Connector

Terminal

M61

10

Ground

Engine is running
• Warm-up condition
• Idle speed

Engine is running
• Warm-up condition
• Engine speed: Approx. 2,000 rpm

JMBIA0076GB

JMBIA0077GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-18

< DTC/CIRCUIT DIAGNOSIS >

VEHICLE SPEED SIGNAL CIRCUIT

VEHICLE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000006935991

Combination meter sends vehicle speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000006935992

1.

PERFORM COMBINATION METER SELF-DIAGNOSIS

With CONSULT

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine

2.

Perform “METER/M&A” self-diagnosis. Refer to 

MWI-21, "CONSULT Function"

.

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT

1.

Turn the ignition switch OFF.

2.

Disconnect combination meter harness connector.

3.

Disconnect power steering control unit harness connector.

4.

Check continuity between combination meter harness connector and 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 VEHICLE SPEED SIGNAL (1)

1.

Turn the ignition switch OFF.

2.

Connect combination meter harness connector.

3.

Check combination meter input/output standard values. Refer to 

MWI-25, "Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace combination meter Refer to 

MWI-79, "Exploded View"

.

4.

CHECK VEHICLE SPEED SIGNAL (2)

1.

Turn the ignition switch OFF.

2.

Connect power steering control unit harness connector.

3.

Check signal between power steering control unit harness connector and ground with oscilloscope.

Combination meter

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

M34

30

M61

8

Existed

Power steering control unit

—

Continuity

Connector

Terminal

M61

8

Ground

Not existed

Revision: 2012 March

2011 Murano CrossCabriolet

VEHICLE SPEED SIGNAL CIRCUIT

STC-19

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace power steering control unit. Refer to 

STC-21, "Removal and Installation"

.

5.

CHECK TERMINALS AND HARNESS CONNECTORS

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

—

Condition

Voltage

(Approx.)

Connector

Terminal

M61

 8

Ground

Vehicle speed: 40 km/h (25 MPH)

CAUTION:

Check air pressure of tire under 
standard condition.

NOTE:
The maximum voltage varies de-
pending on the specification (desti-
nation unit).

JSNIA0015GB

Revision: 2012 March

2011 Murano CrossCabriolet

STC-20

< SYMPTOM DIAGNOSIS >

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

SYMPTOM DIAGNOSIS

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)

Description

INFOID:0000000006935996

• Hard steering when fully turning the steering wheel.
• Light steering when driving at a high speed.

Diagnosis Procedure

INFOID:0000000006935997

1.

CHECK SYSTEM FOR POWER SUPPLY AND GROUND

Perform trouble diagnosis for power supply and ground. Refer to 

STC-13, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK SYSTEM FOR VEHICLE SPEED SIGNAL

Perform trouble diagnosis for vehicle speed signal. Refer to 

STC-18, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK SYSTEM FOR ENGINE SPEED SIGNAL

Perform trouble diagnosis for engine speed signal. Refer to 

STC-16, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE

Perform trouble diagnosis for power steering solenoid valve. Refer to 

STC-14, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Perform the symptom diagnosis for the steering system. Refer to 

ST-28, "NVH Troubleshooting

Chart"

.

NO

>> Repair or replace damaged parts.

Revision: 2012 March

2011 Murano CrossCabriolet

 

 

 

 

 

 

 

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