Nissan Maxima. Manual — part 1124
STC-2
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
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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 will be necessary to
check symptoms by driving vehicle with customer.
>> GO TO 2.
2.
BASIC INSPECTION
1. Check the power steering fluid leakage and 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 oil leakage. Refer to
4. Check the relief oil pressure. Refer to
>> GO TO 3.
3.
TROUBLE DIAGNOSIS FOR 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.
EPS SYSTEM
STC-3
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
EPS SYSTEM
System Diagram
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CONTROL DIAGRAM
System Description
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• The EPS system controls the power steering solenoid valve
through the power steering control unit.
• 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 occurring in “2R” and “3R”. This
results in a light steering force because of high pressure.
During High-speed Operation
JSGIA0119GB
AWGIA0089GB
JSGIA0020GB
STC-4
< SYSTEM DESCRIPTION >
EPS SYSTEM
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 occurring in “3R” and results in a
heavy steering force.
Component Parts Location
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JSGIA0021GB
AWGIA0090ZZ
EPS SYSTEM
STC-5
< SYSTEM DESCRIPTION >
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Component Description
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1.
Power steering control unit M59
(view with glove box removed)
2.
Power steering solenoid valve E14
Component parts
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
Refer to
.
ECM
Refer to
.
Power steering solenoid valve
Refer to
.
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