Infiniti QX56 (Z62). Manual — part 1265
STC-12
< WIRING DIAGRAM >
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
JCGWM0394GB
DIAGNOSIS AND REPAIR WORK FLOW
STC-13
< BASIC INSPECTION >
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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
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.
STC-14
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000006256125
1.
CHECK POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
2.
Disconnect power steering control unit harness connector.
3.
Check the voltage between power steering control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY (2)
1.
Turn the ignition switch OFF.
2.
Check 10A fuse (#3).
3.
Disconnect fuse block (J/B) harness connector.
4.
Check the continuity between power steering control unit harness connector and fuse block (J/B) harness
connector.
5.
Check the continuity between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> Perform trouble diagnosis for ignition power supply circuit. Refer to
.
NO
>> Repair or replace damaged parts.
3.
CHECK GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check the continuity between power steering control unit harness connector and ground.
Power steering control unit
—
Voltage
Connector
Terminal
M108
3 Ground
0
V
Power steering control unit
—
Voltage
Connector
Terminal
M108
3 Ground
Battery
voltage
Power steering control unit
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M108
3
M1
2A
Existed
Power steering control unit
—
Continuity
Connector
Terminal
M108
3
Ground
Not existed
POWER SUPPLY AND GROUND CIRCUIT
STC-15
< DTC/CIRCUIT DIAGNOSIS >
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Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK TERMINALS AND HARNESS CONNECTORS
Check the 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 error-detected parts.
Power steering control unit
—
Continuity
Connector
Terminal
M108
6 Ground
Existed
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