Infiniti G37 Coupe. Manual — part 1249
C1621, C1622 4WAS FRONT ACTUATOR
STC-47
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
COMPONENT DIAGNOSIS
C1621, C1622 4WAS FRONT ACTUATOR
Description
INFOID:0000000001666306
• 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:0000000001666307
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Steer 360
°
leftward slowly. Then steer 360
°
rightward to return the steering wheel to the straight-ahead
position. Repeat the same service for 1 minute or more.
NOTE:
The protection function mode (overheat protection) activates and the system stops if steering repeats for a
long time.
3.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1621” or “C1622” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666308
1.
CHECK 4WAS FRONT MOTOR CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS front actuator harness connector.
3.
Check the resistance between 4WAS front actuator harness connectors.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1621
ACTUATOR
4WAS front motor current valve error is detected.
(4WAS front motor current valve is excessively large.)
4WAS front control unit or
4WAS front motor error is
detected.
C1622
ACTUATOR
4WAS front motor voltage valve or current error valve is
detected.
(4WAS front motor voltage valve error is detected.)
(Voltage valve or current valve error is detected when
starting the system.)
4WAS front control unit or
4WAS front motor error is
detected.
STC-48
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1621, C1622 4WAS FRONT ACTUATOR
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.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1.
Connect 4WAS front control unit harness connector.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1621” or “C1622” detected?
YES
>> Replace 4WAS front control unit. Refer to
.
NO
>> GO TO 3.
3.
CHECK INFORMATION
With CONSULT-III
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
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 Motor)
INFOID:0000000001666309
1.
CHECK 4WAS FRONT MOTOR
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.
4WAS front actuator
Resistance
(Approx.)
Connector
Terminal
Connector
Terminal
M351
1
M351
5
0.1 – 1
Ω
1
6
5
6
4WAS front actuator
Continuity
Connector
Terminal
M351
1 – Ground
Not existed
5 – Ground
6 – Ground
4WAS front actuator
Resistance
(Approx.)
Connector
Terminal
Connector
Terminal
M351
1
M351
5
0.1 – 1
Ω
1
6
5
6
C1621, C1622 4WAS FRONT ACTUATOR
STC-49
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace 4WAS front actuator. Refer to
STC-179, "Removal and Installation"
.
Special Repair Requirement
INFOID:0000000001666310
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
Continuity
Connector
Terminal
M351
1 – Ground
Not existed
5 – Ground
6 – Ground
STC-50
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1627 4WAS FRONT ACTUATOR
C1627 4WAS FRONT ACTUATOR
Description
INFOID:0000000001666311
• 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:0000000001666312
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Steer 360
°
leftward slowly. Then steer 360
°
rightward to return the steering wheel to the straight-ahead
position. Repeat the same service for 1 minute or more.
NOTE:
The protection function mode (overheat protection) activates and the system stops if steering repeats for a
long time.
3.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1627” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666313
1.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis
Is any DTC detected other than “C1627”?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1627” detected?
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1627
ACTUATOR
The indication value from 4WAS front actuator (front
wheel angle) differs from the value from 4WAS front
control unit.
4WAS front actuator error
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