Infiniti QX56 (Z62). Manual — part 1267
STC-20
< DTC/CIRCUIT DIAGNOSIS >
VEHICLE SPEED SIGNAL CIRCUIT
VEHICLE SPEED SIGNAL CIRCUIT
Diagnosis Procedure
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1.
PERFORM COMBINATION METER SELF-DIAGNOSIS
With CONSULT-III
Perform “METER/M&A” self-diagnosis. Refer to
MWI-30, "CONSULT-III Function"
.
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 the continuity between combination meter harness connector and power steering control unit har-
ness connector.
5.
Check the continuity between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK VEHICLE SPEED SIGNAL (COMBINATION METER)
1.
Connect combination meter harness connector.
2.
Check the combination meter input/output standard values. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace combination meter Refer to
MWI-85, "Removal and Installation"
.
4.
CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT)
1.
Turn the ignition switch OFF.
2.
Connect power steering control unit harness connector.
3.
Check the 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
M108
8
Existed
Power steering control unit
—
Continuity
Connector
Terminal
M108
8
Ground
Not existed
Power steering control unit
—
Condition
Voltage (Approx.)
Connector
Terminal
M108
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
VEHICLE SPEED SIGNAL CIRCUIT
STC-21
< DTC/CIRCUIT DIAGNOSIS >
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Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace power steering control unit. Refer to
STC-23, "Removal and Installation"
5.
CHECK TERMINALS AND HARNESS CONNECTORS
• Check the power steering control unit pin terminals for damage or loose connection with harness connector.
• Check the combination meter 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.
STC-22
< SYMPTOM DIAGNOSIS >
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
SYMPTOM DIAGNOSIS
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Description
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• Hard steering when fully turning the steering wheel.
• Light steering when driving at a high speed.
Diagnosis Procedure
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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 error-detected 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 error-detected 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 error-detected 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
.
NO
>> Repair or replace error-detected parts.
POWER STEERING CONTROL UNIT
STC-23
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
POWER STEERING CONTROL UNIT
Removal and Installation
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REMOVAL
1.
Remove instrument lower cover. Refer to
IP-14, "Removal and Installation"
2.
Remove instrument lower panel RH. Refer to
IP-14, "Removal and Installation"
3.
Disconnect power steering control unit connector.
4.
Remove power steering control unit.
INSTALLATION
Install in the reverse order of removal.
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