Nissan Murano Z51 (2012 year). Manual — part 89
STC-4
< SYSTEM DESCRIPTION >
EPS SYSTEM
• 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.
JSGIA0374GB
JSGIA0020GB
JSGIA0021GB
Revision: 2013 February
2012 MURANO
EPS SYSTEM
STC-5
< SYSTEM DESCRIPTION >
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Component Parts Location
INFOID:0000000007540091
Component Description
INFOID:0000000007540092
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
ECM
Power steering solenoid valve
Revision: 2013 February
2012 MURANO
STC-6
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000007540093
Power supply to EPS system
Diagnosis Procedure
INFOID:0000000007540094
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-65, "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: 2013 February
2012 MURANO
POWER STEERING SOLENOID VALVE
STC-7
< DTC/CIRCUIT DIAGNOSIS >
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POWER STEERING SOLENOID VALVE
Description
INFOID:0000000007540095
Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
Diagnosis Procedure
INFOID:0000000007540096
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
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace gear-sub assembly. Refer to
(With heated steering wheel),
(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
Revision: 2013 February
2012 MURANO
STC-8
< DTC/CIRCUIT DIAGNOSIS >
POWER STEERING SOLENOID VALVE
YES
>> INSPECTION END
NO
>> Repair or replace damaged parts.
Component Inspection
INFOID:0000000007540097
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
(Without heated steering wheel).
Power steering solenoid valve
Resistance (Approx.)
Terminal
1 2
4
–
6
Ω
Revision: 2013 February
2012 MURANO
ENGINE SPEED SIGNAL CIRCUIT
STC-9
< DTC/CIRCUIT DIAGNOSIS >
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ENGINE SPEED SIGNAL CIRCUIT
Description
INFOID:0000000007540098
ECM sends engine speed signal to power steering control unit.
Diagnosis Procedure
INFOID:0000000007540099
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
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: 2013 February
2012 MURANO
STC-10
< DTC/CIRCUIT DIAGNOSIS >
ENGINE SPEED SIGNAL CIRCUIT
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace ECM. Refer to
EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT :
.
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-20, "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: 2013 February
2012 MURANO
VEHICLE SPEED SIGNAL CIRCUIT
STC-11
< DTC/CIRCUIT DIAGNOSIS >
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VEHICLE SPEED SIGNAL CIRCUIT
Description
INFOID:0000000007540100
Combination meter sends vehicle speed signal to power steering control unit.
Diagnosis Procedure
INFOID:0000000007540101
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-35, "CONSULT Function (METER/M&A)"
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
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace combination meter Refer to
.
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: 2013 February
2012 MURANO
STC-12
< DTC/CIRCUIT DIAGNOSIS >
VEHICLE SPEED SIGNAL CIRCUIT
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace power steering control unit. Refer to
STC-20, "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: 2013 February
2012 MURANO
POWER STEERING CONTROL UNIT
STC-13
< ECU DIAGNOSIS INFORMATION >
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ECU DIAGNOSIS INFORMATION
POWER STEERING CONTROL UNIT
Reference Value
INFOID:0000000007540102
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: 2013 February
2012 MURANO
STC-14
< 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.
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
Revision: 2013 February
2012 MURANO
POWER STEERING CONTROL UNIT
STC-15
< ECU DIAGNOSIS INFORMATION >
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Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -
INFOID:0000000007540103
For connector terminal arrangements, harness layouts, and alphabets in a
(option abbreviation; if not
described in wiring diagram), refer to
GI-12, "Connector Information"
Fail-Safe
INFOID:0000000007540104
EPS system
JCGWM0180GB
Revision: 2013 February
2012 MURANO
STC-16
< ECU DIAGNOSIS INFORMATION >
POWER STEERING CONTROL UNIT
• 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: 2013 February
2012 MURANO
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
STC-17
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Description
INFOID:0000000007540105
• Hard steering when fully turning the steering wheel.
• Light steering when driving at a high speed.
Diagnosis Procedure
INFOID:0000000007540106
1.
CHECK SYSTEM FOR POWER SUPPLY AND GROUND
Perform trouble diagnosis for power supply and ground. Refer to
.
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
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
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
Is the inspection result normal?
YES
>> Perform the symptom diagnosis for the steering system. Refer to
(With heated steering wheel),
ST-73, "NVH Troubleshooting Chart"
(Without heated steer-
ing wheel).
NO
>> Repair or replace damaged parts.
Revision: 2013 February
2012 MURANO
STC-18
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
FOR USA AND CANADA
FOR USA AND CANADA : Precaution for Supplemental Restraint System (SRS) "AIR
BAG" and "SEAT BELT PRE-TENSIONER"
INFOID:0000000007540107
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
FOR MEXICO
FOR MEXICO : Precaution for Supplemental Restraint System (SRS) "AIR BAG" and
"SEAT BELT PRE-TENSIONER"
INFOID:0000000007814143
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.
WARNING:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Revision: 2013 February
2012 MURANO
PRECAUTIONS
STC-19
< PRECAUTION >
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Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Revision: 2013 February
2012 MURANO
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