Infiniti G37 Coupe. Manual — part 1269
C1931 4WAS FRONT CONTROL UNIT COMMUNICATION
STC-127
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
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C1931 4WAS FRONT CONTROL UNIT COMMUNICATION
Description
INFOID:0000000001878427
• 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:0000000001666454
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 main control unit self-diagnosis.
Is DTC “C1931” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-127, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666455
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)
Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1931
4WAS FRONT ECU COMM
4WAS communication line* data communication error
is detected.
(An error signal is detected from 4WAS front control
unit.)
4WAS communication
line*/4WAS front control
unit/4WAS main 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-128
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1931 4WAS FRONT CONTROL UNIT COMMUNICATION
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
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
C1931 4WAS FRONT CONTROL UNIT COMMUNICATION
STC-129
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
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4.
Check the continuity between 4WAS front control unit harness connector and ABS actuator and electric
unit (control unit) harness connector.
5.
Check that 4WAS front control unit connector No. 14 terminal and No. 25 are connected properly and not
deformed.
Is the inspection result normal?
YES
>> Replace 4WAS front control unit. Refer to
.
NO
>> Repair or replace the harnesses and connectors. Refer to
STC-176, "Precautions for Harness
8.
CHECK 4WAS MAIN CONTROL UNIT CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS main control unit harness connector.
3.
Disconnect ABS actuator and electric unit (control unit) harness connector.
4.
Check the continuity between 4WAS main control unit harness connector and ABS actuator and electric
unit (control unit) harness connector.
5.
Check that 4WAS main control unit connector No. 31 terminal and No. 32 are connected properly and not
deformed.
Is the inspection result normal?
YES
>> Replace 4WAS main control unit. Refer to
NO
>> Repair or replace the harnesses and connectors. Refer to
STC-176, "Precautions for Harness
Component Inspection [ABS Actuator and Electric Unit (Control Unit)]
INFOID:0000000001666456
1.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1.
Turn the ignition switch OFF.
2.
Remove ABS actuator and electric unit (control unit). Refer to
.
3.
Check the resistance between ABS actuator and electric unit (control unit) connector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ABS actuator and electric unit (control unit).
Component Inspection (Yaw Rate/Side G Sensor)
INFOID:0000000001666457
1.
CHECK YAW RATE/SIDE G SENSOR
1.
Turn the ignition switch OFF.
2.
Remove yaw rate/side G sensor. Refer to
.
3.
Check the resistance between yaw rate/side G sensor connector terminals.
4WAS front control unit
ABS actuator and electric
unit (control unit)
Continuity
Connector
Terminal
Connector
Terminal
M42
14
E41
25
Existed
25
45
4WAS main control unit
ABS actuator and electric
unit (control unit)
Continuity
Connector
Terminal
Connector
Terminal
B54
31
E41
45
Existed
32
25
ABS actuator and electric unit (control unit)
Resistance (Approx.)
Connector
Terminal
E41
25 – 45
120
Ω
STC-130
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1931 4WAS FRONT CONTROL UNIT COMMUNICATION
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace yaw rate/side G sensor.
Special Repair Requirement
INFOID:0000000001666458
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”.
BEFORE REPLACING 4WAS MAIN CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing 4WAS main 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)"
Yaw rate/side G sensor
Resistance (Approx.)
Connector
Terminal
M143
2 – 3
120
Ω
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