Infiniti EX35. Manual — part 1394
STC-2
< BASIC INSPECTION >
[EPS]
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
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 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
(2WD models),
(AWD models).
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.
EPS SYSTEM
STC-3
< FUNCTION DIAGNOSIS >
[EPS]
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FUNCTION DIAGNOSIS
EPS SYSTEM
System Diagram
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CONTROL DIAGRAM
CROSS-SECTIONAL VIEW
System Description
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• The EPS system controls the power steering solenoid valve through the power steering control unit.
JSGIA0258GB
1.
Unified meter and A/C amp.
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
STC-4
< FUNCTION DIAGNOSIS >
[EPS]
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.
JSGIA0113GB
JSGIA0020GB
JSGIA0021GB
EPS SYSTEM
STC-5
< FUNCTION DIAGNOSIS >
[EPS]
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Component Parts Location
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Component Description
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1.
Power steering solenoid valve
2.
Power steering control unit
A.
Steering gear assembly
B.
Glove box assembly removed
: Vehicle front
JSGIA0342ZZ
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.)
Unified meter and A/C amp.
ECM
Power steering solenoid valve
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