Infiniti G37 Coupe. Manual — part 1256
C1671 ACTUATOR ADJUSTMENT NOT PERFORMED
STC-75
< 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-76
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1672 INCOMPLETE ACTUATOR ADJUSTMENT
C1672 INCOMPLETE ACTUATOR ADJUSTMENT
Description
INFOID:0000000001666365
• Memorize the neutral position of 4WAS front actuator in 4WAS front control unit.
DTC Logic
INFOID:0000000001666366
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 “C1672” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666367
1.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is any DTC other than “C1672” detected?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
ADJUST 4WAS FRONT ACTUATOR
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 error system detected?
YES
>>
Replace 4WAS front control unit. Refer to
.
• Perform 4WAS actuator adjustment after replacing 4WAS front control unit. Perform the 4WAS
front control unit self-diagnosis again. Replace 4WAS front actuator if DTC “C1672” is detected.
Refer to
STC-179, "Removal and Installation"
NO
>> INSPECTION END
Special Repair Requirement
INFOID:0000000001666368
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)"
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1672
INCOMP ACTUATR ADJ
4WAS front actuator adjustment is incomplete.
4WAS front actuator ad-
justment is incomplete.
C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION
STC-77
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION
Description
INFOID:0000000001666369
• 4WAS front control unit and 4WAS main control unit transmit/receive information to/from each other for opti-
mum control of the 4WAS system with the specified 4WAS system line (4WAS communication line) between
4WAS front control unit and 4WAS main control unit.
• Be careful to repair wirings because 4WAS system specified line adopts twisted-pair wires. Refer to
176, "Precautions for Harness Repair"
DTC Logic
INFOID:0000000001666370
DTC DETECTION LOGIC
*: Communication line between 4WAS front control unit and 4WAS main control unit
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 “C1684” or “C1685” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666371
1.
CHECK COMMUNICATION LINE (1)
1.
Turn the ignition switch OFF.
2.
Disconnect ABS actuator and electric unit (control unit) harness connector.
3.
Disconnect yaw rate/side G sensor harness connector.
4.
Disconnect 4WAS front control unit harness connector.
5.
Disconnect 4WAS main control unit harness connector.
6.
Check the continuity between ABS actuator and electric unit (control unit) harness connector and yaw
rate/side G sensor harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the harnesses and connectors. Refer to
STC-176, "Precautions for Harness
2.
CHECK COMMUNICATION LINE (2)
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1684
4WAS MAIN ECU COMM
4WAS communication line* data communication error
is detected.
(An error signal is detected from 4WAS main control
unit.)
4WAS communication
line*/4WAS main control
unit/4WAS front control
unit error
C1685
4WAS MAIN ECU COMM
4WAS communication line* data communication error
is detected.
(An error signal is detected from 4WAS main control
unit.)
4WAS communication
line*/4WAS main control
unit/4WAS front control
unit error
ABS actuator and electric
unit (control unit)
Yaw rate/side G sensor.
Continuity
Connector
Terminal
Connector
Terminal
E41
25
M143
2
Existed
45
3
STC-78
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION
Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the harnesses and connectors. Refer to
STC-176, "Precautions for Harness
3.
CHECK COMMUNICATION LINE (3)
Check the continuity between ABS actuator and electric unit (control unit) harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace the harnesses and connectors. Refer to
STC-176, "Precautions for Harness
4.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check the continuity between ABS actuator and electric unit (control unit) connector. Refer to
ponent Inspection [ABS Actuator and Electric Unit (Control Unit)]"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace ABS actuator and electric unit (control unit). Refer to
5.
CHECK YAW RATE/SIDE G SENSOR
Check the continuity between yaw rate/side G sensor connector. Refer to
BRC-62, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace yaw rate/side G sensor. Refer to
6.
CHECK CAN DIAGNOSIS SUPPORT MONITOR (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1.
Connect ABS actuator and electric unit (control unit) harness connector.
2.
Connect yaw rate/side G sensor harness connector.
3.
Connect 4WAS front control unit harness connector.
4.
Connect 4WAS main control unit harness connector.
5.
Start the engine.
CAUTION:
Stop the vehicle.
6.
Perform CAN diagnosis support monitor of 4WAS front control unit.
7.
Replace 4WAS main control unit error history. Refer to
What is the indicated item?
All items are “OK”>>GO TO 7.
“TRANSMIT DIAG” is other than “OK”>>GO TO 7.
“4WAS(MAIN)” is other than “OK”>>GO TO 8.
7.
CHECK 4WAS FRONT CONTROL UNIT CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS front control unit harness connector.
3.
Disconnect ABS actuator and electric unit (control unit) harness connector.
ABS actuator and electric unit (control unit)
Continuity
Connector
Terminal
E41
25 – Ground
Not existed
45 – Ground
ABS actuator and electric unit (control unit)
Continuity
Connector
Terminal
E41
25 – 45
Not existed
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