Infiniti G37 Coupe. Manual — part 1254
C1655 4WAS FRONT DRIVER
STC-67
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
AFTER REPLACING 4WAS FRONT CONTROL UNIT
• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to
FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"
STC-68
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1661 4WAS FRONT LOCK SOLENOID VALVE
C1661 4WAS FRONT LOCK SOLENOID VALVE
Description
INFOID:0000000001666344
• Secure the inside of 4WAS front actuator temporarily. (It operates when performing active test with fail-safe
function and CONSULT-III.)
• 4WAS front lock solenoid valve is activated in the active test (lock release). The secured 4WAS front actua-
tor is released.
• 4WAS front control unit controls 4WAS front actuator. 4WAS front actuator releases the lock when the
engine speed signal is “ON”. 4WAS front actuator applies the lock when the engine speed signal is “OFF”.
DTC Logic
INFOID:0000000001666345
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1661” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666346
1.
CHECK 4WAS FRONT SOLENOID VALVE CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS front actuator harness connector.
3.
Check the resistance between 4WAS front actuator harness connectors.
4.
Check the continuity between 4WAS front actuator harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace 4WAS front actuator. Refer to
STC-179, "Removal and Installation"
2.
CHECK INFORMATION
With CONSULT-III
1.
Connect 4WAS front actuator harness connector.
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1661
LOCK SOLENOID
4WAS front lock solenoid valve error is detected.
(An electric activation error is detected.)
4WAS front control unit or
4WAS front lock solenoid
valve error is detected.
4WAS front actuator
Resistance
(Approx.)
Connector
Terminal
Connector
Terminal
M351
10
M351
3
1 – 100
Ω
4WAS front actuator
Continuity
Connector
Terminal
M351
3 – Ground
Not existed
10 – Ground
C1661 4WAS FRONT LOCK SOLENOID VALVE
STC-69
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is each data the standard value?
YES
>> Check each harness connector pin terminal for disconnection.
NO
>> Replace 4WAS front control unit. Refer to
.
Component Inspection (4WAS Front Lock Solenoid Valve)
INFOID:0000000001666347
1.
CHECK 4WAS FRONT SOLENOID VALVE CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS front actuator harness connector.
3.
Check the resistance between 4WAS front actuator harness connectors.
4.
Check the continuity between 4WAS front actuator harness connector and the ground.
Is the inspection result normal?
YES
>> INSPECTION END.
NO
>> Replace 4WAS front actuator. Refer to
STC-179, "Removal and Installation"
.
Special Repair Requirement
INFOID:0000000001666348
AFTER REPLACING 4WAS FRONT ACTUATOR
• Perform 4WAS front actuator adjustment after replacing 4WAS front actuator. Refer to
FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)"
BEFORE REPLACING 4WAS FRONT CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing 4WAS front control unit
after diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
AFTER REPLACING 4WAS FRONT CONTROL UNIT
• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to
FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"
4WAS front actuator
Resistance
(Approx.)
Connector
Terminal
Connector
Terminal
M351
10
M351
3
1 – 100
Ω
4WAS front actuator
Continuity
Connector
Terminal
M351
3 – Ground
Not existed
10 – Ground
STC-70
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1667 LOCK INSERTION
C1667 LOCK INSERTION
Description
INFOID:0000000001666349
• Wiring connected to 4WAS front actuator is integrated with 4WAS front actuator.
• 4WAS front actuator rotates together with steering wheel.
• 4WAS front actuator mainly consists of five components. [4WAS front lock solenoid valve (lock structure),
front wheel steering angle sensor, 4WAS front motor, gear shaft, and spiral cable]
- 4WAS front lock solenoid valve (lock structure) is controlled by the 4WAS front control unit, and locks/
unlocks 4WAS front actuator.
- If a strong force (rotation direction) is applied to 4WAS front actuator, the locking mechanism (holder)
absorbs the force and locks 4WAS front actuator.
- Front wheel steering angle sensor detects a turning angle of 4WAS front motor.
- 4WAS front motor controls number of revolutions by a command value from the 4WAS front control unit.
- Gear shaft is an output axis of 4WAS front motor. (Gear shaft = 4WAS front motor revolution + steering
angle)
- Spiral cables mean the power line and signal lines of 4WAS front motor.
DTC Logic
INFOID:0000000001666350
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Steer 30
°
leftward slowly. Steer 30
°
rightward. Return the steering wheel to the straight-ahead position.
3.
Turn the ignition switch OFF.
4.
Turn the ignition switch ON.
5.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1667” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666351
1.
CHECK 4WAS FRONT LOCK SOLENOID VALVE (LOCK STRUCTURE)
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Steer 30
°
leftward slowly. Steer 30
°
rightward. Return the steering wheel to the straight-ahead position.
3.
Turn the ignition switch OFF.
4.
Turn the ignition switch ON.
5.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1667” detected?
YES
>> Replace 4WAS front actuator. Refer to
STC-179, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK INFORMATION
With CONSULT-III
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1667
LOCK INSERTION
4WAS front lock solenoid valve (lock) error is detected.
(An error is detected in lock condition.)
The inside 4WAS front
actuator error is detected.
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