Nissan Murano Z51 (2008 year). Manual — part 372
POWER STEERING OIL PUMP
ST-37
< ON-VEHICLE REPAIR >
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Removal and Installation
INFOID:0000000003305922
REMOVAL
1.
Drain power steering fluid from reservoir tank.
2.
Remove front road wheel and tires.
3.
Remove splash guard. Refer to
EXT-23, "FENDER PROTECTOR : Exploded View"
4.
Loosen drive belt. Refer to
EM-13, "Removal and Installation"
.
5.
Remove drive belt from oil pump pulley.
6.
Remove copper washers and eye bolt (drain fluid from their pipings).
7.
Remove suction hose (drain fluid from their pipings).
8.
Remove oil pump mounting bolts, and then remove oil pump.
CAUTION:
Never damage drive shaft boot.
INSTALLATION
Note the following, and install in the reverse order of removal.
• When installing suction hoses (1), refer to the figure.
CAUTION:
• Never apply fluid to the hose (1) and tube (2).
• Insert hose securely until it contacts spool (A) of tube.
• Leave clearance (L) when installing clamp (3).
• When installing eye bolt (1) and copper washers (2) to oil pump
(3), refer to the figure.
CAUTION:
• Never reuse copper washer.
• Apply power steering fluid to around copper washer, then
install eye bolt.
• Install eye bolt with eye joint (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by
hand. Refer to
• Securely insert harness connector to pressure sensor.
• Adjust belt tension. Refer to
• Check fluid level, fluid leakage and air bleeding hydraulic system after the installation. Refer to
Disassembly and Assembly
INFOID:0000000003305923
DISASSEMBLY
1.
Remove rear bracket.
10. O-ring
11.
O-ring
12. Front side plate
13. Vane
14. Rotor
15. Cam ring
16. Dowel pin
17. Rear side plate
18. O-ring
19. Teflon ring
20. Rear cover
21. Rear bracket
A.
Oil seal lip
: Apply power steering fluid.
: Apply multi-purpose grease.
Refer to
for symbols not described on the above.
Standard
L
: 3 – 8 mm (0.12 – 0.31 in)
JSGIA0118ZZ
SGIA1379E
Revision: 2008 October
2009 Murano
ST-38
< ON-VEHICLE REPAIR >
POWER STEERING OIL PUMP
2.
Remove rear cover mounting bolts, and then remove rear cover from body assembly.
CAUTION:
• Fix oil pump with a vise if necessary.
• Use copper plates when fixing with a vise.
3.
Remove O-ring from body assembly.
4.
Remove rear side plate from cartridge, and then remove Teflon ring and O-ring from rear side plate.
5.
Remove rotor snap ring (1) using a snap ring pliers, and remove
cam ring, rotor and vane from body assembly.
CAUTION:
When removing the snap ring, never damage the pulley
shaft.
6.
Remove front side plate.
7.
Remove cartridge, flow control valve (1), flow control valve
spring (2) and flow control valve sub assembly (3) from body
assembly (4).
CAUTION:
Never drop and damage flow control valve and flow control
valve sub assembly when removing.
8.
Remove oil seal from body assembly.
9.
Remove mounting bolt of suction pipe, and then remove suction
pipe from body assembly.
10. Remove pulley from body assembly.
11. Remove front bracket from body assembly.
12. Remove oil seal from body assembly using a flat-bladed screw-
driver.
CAUTION:
Never damage the body assembly.
ASSEMBLY
1.
Apply recommended grease to oil seal lips (1). Apply recom-
mended fluid to around oil seal. Install oil seal to body assembly
using proper tool.
CAUTION:
• Fix oil pump with a vise if necessary.
• Use copper plates when fixing with a vise.
2.
Install front bracket to body assembly.
3.
Install pulley to body assembly.
4.
If dowel pin has been removed, insert it into body assembly by
hand. If it cannot be inserted by hand, lightly tap with a hammer.
JSGIA0328ZZ
JSGIA0329ZZ
JSGIA0331ZZ
JSGIA0330ZZ
Revision: 2008 October
2009 Murano
POWER STEERING OIL PUMP
ST-39
< ON-VEHICLE REPAIR >
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5.
Install flow control valve (1), flow control valve spring (2) and
flow control valve sub assembly (3) as shown in the figure to
body assembly (4).
6.
Install front side plate (3) with dowel pin (2) on flow control valve
A (1) side as shown in the figure aligning with front side plate
cutout (A) to body assembly (4).
7.
Install cam ring as shown in the figure.
8.
Install rotor so that mark faces body assembly, and then install it
to pulley shaft.
9.
Install vane to rotor so that arc of vane faces cam ring side.
JSGIA0329ZZ
SGIA1189E
SGIA0612E
SGIA0989E
SGIA0613E
Revision: 2008 October
2009 Murano
ST-40
< ON-VEHICLE REPAIR >
POWER STEERING OIL PUMP
10. Install rotor snap ring to slit of pulley shaft using a hammer and a
10 mm (0.39 in) box.
CAUTION:
• Never damage rotor and pulley shaft.
• Oil pump assembly must be replaced if rotor is damaged.
11. Install rear side plate with dowel pin A on flow control valve A
side as shown in the figure aligning with rear side plate cutout B
to cartridge.
12. Apply recommended fluid to O-ring, and then install O-ring to
body assembly.
13. Apply recommended fluid to O-ring, and then install O-ring to
rear side plate.
14. Apply recommended fluid to Teflon ring, and then install Teflon
ring to rear side plate.
15. Install rear cover to body assembly.
16. Apply recommended fluid to O-ring, and then install O-ring to
body assembly.
17. Install suction pipe to body assembly.
18. Install rear bracket.
Inspection
INFOID:0000000003305924
RELIEF OIL PRESSURE
CAUTION:
Make sure that belt tension is normal before starting the following procedure.
1.
Connect the oil pressure gauge [SST: KV48103500 (J-26357)]
and the oil pressure gauge adapter [SST: KV48102500 (J-
33914)] between oil pump discharge connector and high-pres-
sure hose. Bleed air from the hydraulic circuit while opening
valve fully. Refer to
.
2.
Start the engine. Run the engine until oil temperature reaches
50 to 80
°
C (122 to 176
°
F).
CAUTION:
• Leave the valve of the oil pressure gauge fully open while
starting and running the engine. If engine is started with
the valve closed, the hydraulic pressure in oil pump goes
up to the relief pressure along with unusual increase of oil
temperature.
• Be sure to keep hose clear of belts and other parts when
engine is started.
3.
Fully close the oil pressure gauge valve with engine at idle and
measure the relief oil pressure.
CAUTION:
Never keep valve closed for 10 seconds or longer.
4.
Open the valve slowly after measuring. Repair oil pump if the relief oil pressure is outside the standard.
Refer to
ST-37, "Disassembly and Assembly"
SGIA0063E
PGIA0035E
Standard
Relief oil pressure
: Refer to
.
SGIA0915E
Revision: 2008 October
2009 Murano
POWER STEERING OIL PUMP
ST-41
< ON-VEHICLE REPAIR >
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5.
Disconnect the oil pressure gauge from hydraulic circuit.
6.
When installing eye bolt (1) and copper washers (2) to oil pump
(3), refer to the figure.
CAUTION:
• Never reuse copper washer.
• Apply power steering fluid or equivalent to around copper
washer, then install eye bolt.
• Install eye bolt with eye joint (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by
hand. Refer to
• Securely insert harness connector to pressure sensor.
7.
Check fluid level, fluid leakage and air bleeding hydraulic sys-
tem after the installation. Refer to
.
BEFORE DISASSEMBLY
Disassemble oil pump only when the following malfunctions occur.
• If oil leakage is found on oil pump.
• Oil pump pulley is damaged or deformed.
• Performance of oil pump is low.
AFTER DISASSEMBLY
Body Assembly and Rear Cover Inspection
• Check body assembly and rear cover for internal damage. Replace rear cover if it is damaged. Replace oil
pump assembly if body assembly is damaged.
Cartridge Assembly Inspection
• Check cam ring, rotor and vane for damage. Replace cartridge assembly if necessary.
Side Plate Inspection
• Check side plate for damage. Replace side plate if necessary.
Flow Control Valve Inspection
• Check flow control valve and spring for damage. Replace if necessary.
SGIA1379E
Revision: 2008 October
2009 Murano
ST-42
< ON-VEHICLE REPAIR >
HYDRAULIC LINE
HYDRAULIC LINE
Exploded View
INFOID:0000000003305929
Removal and Installation
INFOID:0000000003464758
CAUTION:
1.
Reservoir tank bracket
2.
Bushing
3.
Reservoir tank
4.
Suction hose
5.
Clamp
6.
Copper washer
7.
High pressure piping
8.
Steering gear assembly
9.
Low pressure hose
10. Eye bolt
A.
To power steering oil pump suction
hose.
B.
To power steering oil pump.
: Vehicle front
: Apply power steering fluid.
Refer to
for symbols not described on the above.
JSGIA0608GB
Revision: 2008 October
2009 Murano
HYDRAULIC LINE
ST-43
< ON-VEHICLE REPAIR >
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• Never apply fluid to the hose (1) and tube (2).
• Insert hose securely until it contacts spool (A) of tube.
• Leave clearance (L) when installing clamp (3).
• Install eye bolt with eye joint (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by hand.
Refer to
• Securely insert harness connector to pressure sensor.
• Apply power steering fluid to around copper washer, then
install eye bolt.
• Never reuse copper washer.
Standard
L
: 3 – 8 mm (0.12 – 0.31 in)
JSGIA0118ZZ
SGIA1379E
Revision: 2008 October
2009 Murano
ST-44
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General Specifications
INFOID:0000000003305931
Steering Wheel Axial End Play and Play
INFOID:0000000003305932
Unit: mm (in)
Steering Wheel Turning Force
INFOID:0000000003305933
Unit: N·m (kg-m, in-lb)
Steering Angle
INFOID:0000000003305934
Unit: Degree minute (Decimal degree)
Steering Column Length
INFOID:0000000004678296
Unit: mm (in)
Steering Column Mounting Dimensions
INFOID:0000000004678297
Unit: mm (in)
Steering Column Operating Range
INFOID:0000000003305935
Steering gear model
PR26AF
Fluid capacity (Approx.)
(US qt, lmp qt)
1.0 (1-1/8, 7/8)
Item
Standard
Steering wheel axial end play
0 (0)
Steering wheel play on the outer circumference
0 – 35 (0 – 1.38)
Item
Standard
Steering wheel turning force
7.45 (0.76, 66)
Item
Standard
Wheel size: 18 inch
Wheel size: 20 inch
Inner wheel
Minimum
33
°
30
′
(33.5
°
)
32
°
00
′
(32.0
°
)
Nominal
36
°
30
′
(36.5
°
)
35
°
00
′
(35.0
°
)
Maximum
37
°
30
′
(37.5
°
)
36
°′
(36.0
°
)
Outer wheel
Nominal
31
°
30
′
(31.5
°
)
30
°
30
′
(30.5
°
)
Item
Standard
Column length
463 (18.23)
Item
Standard
Mounting dimension
30 (1.18) or less
Item
Standard
Without electric motor
With electric motor
Tilt operating range
15
°
18
°
Telescopic operating range
40 mm (1.57 in)
Rotating torque
0.49 N·m (0.05 kg-m, 4 in-lb)
Revision: 2008 October
2009 Murano
SERVICE DATA AND SPECIFICATIONS (SDS)
ST-45
< SERVICE DATA AND SPECIFICATIONS (SDS)
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Lower Shaft Length
INFOID:0000000003305936
Unit: mm (in)
Rack Sliding Force
INFOID:0000000003305937
Unit: N (kg, lb)
Rack Stroke
INFOID:0000000003305938
Unit: mm (in)
Socket Swing Force and Rotating Torque
INFOID:0000000003305939
SWING FORCE
Unit: N (kg, lb)
ROTATING TORQUE
Unit: N·m (kg-m, in-lb)
Socket Axial End Play
INFOID:0000000003305940
Unit: mm (in)
Inner Socket Length
INFOID:0000000003305941
Unit: mm (in)
Relief Oil Pressure
INFOID:0000000003305942
Unit: kPa (kg/cm
2
, psi)
Item
Standard
Lower shaft length
160 (6.3) or more
Item
Standard
2WD
AWD
Rack sliding force
195 – 258 (19.9 – 26.3, 43.8 –
57.9)
227 – 305 (23.2 – 31.1, 51.1 –
68.5)
Item
Standard
Wheel size: 18 inch
Wheel size: 20 inch
Rack neutral position
70.5 (2.776)
68.0 (2.677)
Item
Standard
Outer socket
4.81 – 45.7 (0.5 – 4.6, 1.1 – 10.2)
Inner socket
8.9 – 64 (0.91 – 6.5, 2.01 – 14.3)
Item
Standard
Outer socket
0.3 – 2.9 (0.03 – 0.29, 3 – 25)
Item
Standard
Outer socket
0.5 (0.02) or less
Inner socket
0.2 (0.008) or less
Item
Standard
Rack neutral position
120.3 (4.74)
Item
Standard
Relief oil pressure
9,500 – 10,300 (96.9 – 105.1, 1,378 – 1,494)
Revision: 2008 October
2009 Murano
STC-1
STEERING
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SECTION
STC
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CONTENTS
STEERING CONTROL SYSTEM
BASIC INSPECTION . . . . . . . . .
DIAGNOSIS AND REPAIR WORK FLOW . . .
Work Flow . . . . . . . . . . . . . . . .....
FUNCTION DIAGNOSIS . . . . . . . ...
EPS SYSTEM . . . . . . . . . . . . . ..
System Diagram . . . . . . . . . . . . . ....
System Description . . . . . . . . . . . . ...
Component Parts Location . . . . . . . . . ....
Component Description . . . . . . . . . . .....
COMPONENT DIAGNOSIS . . . . . . ..
POWER SUPPLY AND GROUND CIRCUIT . ...
Description . . . . . . . . . . . . . . . ....
Diagnosis Procedure . . . . . . . . . . . .....
POWER STEERING SOLENOID VALVE . . ...
Description . . . . . . . . . . . . . . . ....
Diagnosis Procedure . . . . . . . . . . . .....
Component Inspection . . . . . . . . . . . ..
ENGINE SPEED SIGNAL CIRCUIT . . . . .
Description . . . . . . . . . . . . . . . ....
Diagnosis Procedure . . . . . . . . . . . .....
VEHICLE SPEED SIGNAL CIRCUIT . . . . .
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
ECU DIAGNOSIS . . . . . . . . . . .
POWER STEERING CONTROL UNIT . . . ..
Reference Value . . . . . . . . . . . . . ..
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - . . .
Fail-Safe . . . . . . . . . . . . . . . . ..
SYMPTOM DIAGNOSIS . . . . . . . ..
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) . . . . . ...
Description . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
PRECAUTION . . . . . . . . . . . ..
PRECAUTIONS . . . . . . . . . . . . .
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . ...
ON-VEHICLE REPAIR . . . . . . . . .
POWER STEERING CONTROL UNIT . . . ..
Exploded View . . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . .
Revision: 2008 October
2009 Murano
STC-2
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow
INFOID:0000000003305943
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
2.
Check the drive belt tension. Refer to
.
3.
Check the power steering gear for damages, cracks and fluid leakage. Refer to
4.
Check the relief oil pressure. Refer to
>> GO TO 3.
3.
DIAGNOSIS CHART BY SYMPTOM
Perform the diagnosis by symptom. Refer to
>> 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: 2008 October
2009 Murano
EPS SYSTEM
STC-3
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
EPS SYSTEM
System Diagram
INFOID:0000000003305944
CONTROL DIAGRAM
CROSS-SECTIONAL VIEW
System Description
INFOID:0000000003305945
• The EPS system controls the power steering solenoid valve through the power steering control unit.
JSGIA0119GB
1.
Combination meter
2.
Power steering control unit
3.
Power steering solenoid valve
4.
Steering gear assembly
5.
Gear housing assembly
6.
Gear sub-assembly
7.
Pinion
8.
Power steering oil pump
9.
Reservoir tank
JSGIA0376ZZ
Revision: 2008 October
2009 Murano
STC-4
< FUNCTION DIAGNOSIS >
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: 2008 October
2009 Murano
EPS SYSTEM
STC-5
< FUNCTION DIAGNOSIS >
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Component Parts Location
INFOID:0000000003305946
Component Description
INFOID:0000000003305947
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: 2008 October
2009 Murano
STC-6
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000003305948
Power supply to EPS system
Diagnosis Procedure
INFOID:0000000003305949
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-67, "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
Connector
Terminal
M61
3 Ground
0
V
Power steering control unit
—
Voltage
Connector
Terminal
M61
3 Ground
Battery
voltage
Power steering control unit
—
Continuity
Connector
Terminal
M61
6 Ground
Existed
Revision: 2008 October
2009 Murano
POWER STEERING SOLENOID VALVE
STC-7
< COMPONENT DIAGNOSIS >
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POWER STEERING SOLENOID VALVE
Description
INFOID:0000000003305950
Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
Diagnosis Procedure
INFOID:0000000003305951
1.
CHECK POWER STEERING SOLENOID VALVE SIGNAL
1.
Turn the ignition switch OFF.
2.
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
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: 2008 October
2009 Murano
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