Infiniti G37 Coupe. Manual — part 1255
C1667 LOCK INSERTION
STC-71
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
1.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
2.
Perform 4WAS front control unit self-diagnosis.
Is each data the standard value?
YES
>> GO TO 1.
NO
>> Replace 4WAS front control unit. Refer to
.
Special Repair Requirement
INFOID:0000000001666352
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)"
STC-72
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1668 LOCK HOLDER GAP DETECT
C1668 LOCK HOLDER GAP DETECT
Description
INFOID:0000000001666353
• 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:0000000001666354
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 “C1668” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666355
1.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Perform 4WAS front control unit self-diagnosis. Check that DTC “C1668” is detected.
CAUTION:
• Replace 4WAS front actuator when the diagnosis history remains.
• Never repair the malfunctioning part in 4WAS front actuator adjustment without replacing 4WAS
front actuator.
>> Replace 4WAS front actuator. Refer to
.
Special Repair Requirement
INFOID:0000000001666356
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)"
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1668
LOCK HLD GAP DETCT
4WAS front lock solenoid valve (lock) error is detected.
(Excessive force is applied to the lock.)
The inside 4WAS front
actuator error is detected.
C1669 INCOMPLETE LOCK RELEASE
STC-73
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
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K
L
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A
B
STC
N
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C1669 INCOMPLETE LOCK RELEASE
Description
INFOID:0000000001666357
• 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:0000000001666358
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 “C1669” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666359
1.
CHECK INFORMATION
• Check that any item below is applicable.
- The steering force is heavy when 4WAS warning lamp is ON.
- The power steering system error is detected (oil leakage, belt tension, steering force etc.).
Is the item applicable?
YES
>> Perform the symptom diagnosis for the steering system. Refer to
.
NO
>> Replace 4WAS front actuator. Refer to
STC-179, "Removal and Installation"
.
Special Repair Requirement
INFOID:0000000001666360
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)"
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1669
INCOMP LOCK RELEAS
4WAS front actuator error is detected.
(An error is detected in unlock condition.)
The power steering oil
pressure or the inside
4WAS front actuator error
is detected.
STC-74
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1671 ACTUATOR ADJUSTMENT NOT PERFORMED
C1671 ACTUATOR ADJUSTMENT NOT PERFORMED
Description
INFOID:0000000001666361
• Memorize the neutral position of 4WAS front actuator in 4WAS front control unit.
DTC Logic
INFOID:0000000001666362
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 “C1671” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666363
1.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is any DTC other than “C1671” detected?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
4WAS FRONT ACTUATOR ADJUSTMENT
With CONSULT-III
1.
Perform 4WAS front actuator adjustment. Refer to
STC-28, "4WAS FRONT ACTUATOR NEUTRAL
POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)"
2.
Perform 4WAS front control unit self-diagnosis.
Is any DTC other than “C1671” detected?
YES
>> Check the error system.
NO
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1671” detected?
YES
>> Replace 4WAS front control unit. Refer to
.
NO
>> INSPECTION END
Special Repair Requirement
INFOID:0000000001666364
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.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1671
ACT ADJ NOT PRFRM
4WAS front actuator adjustment is not performed.
4WAS front actuator ad-
justment is not per-
formed.
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