Infiniti G37 Coupe. Manual — part 1240
POWER STEERING SOLENOID VALVE
STC-11
< COMPONENT DIAGNOSIS >
[WITHOUT 4WAS]
C
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STC
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POWER STEERING SOLENOID VALVE
Description
INFOID:0000000001666273
• Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
Diagnosis Procedure
INFOID:0000000001666274
1.
CHECK POWER STEERING SOLENOID VALVE SIGNAL
1.
Turn the ignition switch OFF.
2.
Check signal between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
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.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK POWER STEERING SOLENOID VALVE
1.
Check resistance between power steering solenoid valve connector terminals.
2.
Check power steering solenoid valve connector by listening for its operation sound while applying battery
voltage to power steering solenoid valve connector F45 terminals 1 (positive) and 2 (negative).
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.
Power steering control unit
Value (Approx.)
Connector
Terminal
Condition
M108
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
F45
1
M108
1
Existed
F45
2
M108
5
Existed
Power steering solenoid valve
Resistance (Approx.)
Connector
Terminal
F45
1 – 2
4 – 6
Ω
STC-12
< COMPONENT DIAGNOSIS >
[WITHOUT 4WAS]
POWER STEERING SOLENOID VALVE
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair or replace damaged parts.
Component Inspection
INFOID:0000000001666275
1.
CHECK POWER STEERING SOLENOID VALVE
1.
Turn the ignition switch OFF.
2.
Disconnect power steering solenoid valve harness connector.
3.
Check resistance between power steering solenoid valve connector terminals.
4.
Check power steering solenoid valve connector by listening for its operation sound while applying battery
voltage to power steering solenoid valve connector F45 terminals 1 (positive) and 2 (negative).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace gear-sub assembly. Refer to
Power steering solenoid valve
Resistance (Approx.)
Connector
Terminal
F45
1 – 2
4 – 6
Ω
ENGINE SPEED SIGNAL CIRCUIT
STC-13
< COMPONENT DIAGNOSIS >
[WITHOUT 4WAS]
C
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B
STC
N
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ENGINE SPEED SIGNAL CIRCUIT
Description
INFOID:0000000001666276
• ECM sends engine speed signal to power steering control unit.
Diagnosis Procedure
INFOID:0000000001666277
1.
PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
Perform ECM self-diagnosis.
Is any error system detected?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT
1.
Turn the ignition switch OFF.
2.
Disconnect ECM harness connectors.
3.
Disconnect power steering control unit harness connector.
4.
Check continuity between ECM harness connector and power steering control unit harness connector.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK ENGINE SPEED SIGNAL (1)
1.
Turn the ignition switch OFF.
2.
Connect ECM harness connectors.
3.
Check signal between ECM harness connector and ground with oscilloscope.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
ECM
Power steering control unit
Continuity
Connector
Terminal
Connector
Terminal
M107
110
M108
10
Existed
ECM
Value (Approx.)
Connector
Terminal
Condition
M107
110 – Ground
Engine speed: At idle
(Warm-up condition)
Engine speed: Approx. 2,000 rpm
(Warm-up condition)
PBIA3654J
PBIA3655J
STC-14
< COMPONENT DIAGNOSIS >
[WITHOUT 4WAS]
ENGINE SPEED SIGNAL CIRCUIT
NO
EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
4.
CHECK ENGINE SPEED SIGNAL (2)
1.
Turn the ignition switch OFF.
2.
Connect power steering control unit harness connector.
3.
Check signal between power steering control unit harness connector and ground with oscilloscope.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace power steering control unit. Refer to
5.
CHECK TERMINALS AND HARNESS CONNECTORS
• Check power steering control unit pin terminals for damage or loose connection with harness connector.
• Check ECM 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
Value (Approx.)
Connector
Terminal
Condition
M108
10 – Ground
Engine speed: At idle
(Warm-up condition)
Engine speed: Approx. 2,000 rpm
(Warm-up condition)
PBIA3654J
PBIA3655J
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