Infiniti G37 Coupe. Manual — part 1257
C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION
STC-79
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
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F
H
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A
B
STC
N
O
P
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:0000000001666372
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:0000000001666373
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-80
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1684, C1685 4WAS MAIN CONTROL UNIT COMMUNICATION
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace yaw rate/side G sensor.
Special Repair Requirement
INFOID:0000000001666374
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 ACTUATOR
• 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
C1686 4WAS MAIN CONTROL UNIT
STC-81
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1686 4WAS MAIN CONTROL UNIT
Description
INFOID:0000000001666375
• It transmits the value calculated by 4WAS main control unit to 4WAS front control unit with 4WAS communi-
cation line (line for 4WAS system). 4WAS front control unit controls 4WAS front actuator according to the
received command value.
DTC Logic
INFOID:0000000001666376
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 “C1686” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666377
1.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is any DTC other than “C1686” detected?
YES
>> Check the error system.
NO
>> Perform 4WAS main control unit self-diagnosis.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1686
4WAS MAIN ECU
An error is detected on 4WAS main control unit side.
(4WAS main control unit fail-safe mode)
4WAS main control unit
fail-safe mode
STC-82
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
U1000, U1002 4WAS COMMUNICATION CIRCUIT
U1000, U1002 4WAS COMMUNICATION CIRCUIT
Description
INFOID:0000000001878358
• 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:0000000001666379
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 “U1000” or “U1002” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666380
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
U1000
CAN COMM CIRCUIT
When 4WAS front control unit is not transmitting or re-
ceiving 4WAS communication signal for 2 seconds or
more.
4WAS communication
line*/4WAS main control
unit/4WAS front control
unit error
U1002
SYSTEM COMM(CAN)
When 4WAS front control unit is not transmitting or re-
ceiving 4WAS communication signal for 2 seconds or
less.
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
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