Infiniti G35 (V35) Sedan. Manual — part 1299
STC-86
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
U1010 4WAS COMMUNICATION CIRCUIT
U1010 4WAS COMMUNICATION CIRCUIT
Description
INFOID:0000000000958822
• 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 adopt a twisted wire. Refer to
"Precautions for Harness Repair"
DTC Logic
INFOID:0000000000958823
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 OFF to ON.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “U1010” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000000958824
1.
4WAS FRONT CONTROL UNIT
Check that there is no malfunction in 4WAS front control unit harness connector or disconnection.
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
Special Repair Requirement
INFOID:0000000000958825
BEFORE REPLACING 4WAS FRONT CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Replace it without erasing 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” when erasing the memory of the self-diagnosis results (record).
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
U1010
CONTROL UNIT(CAN)
Detecting error during the initial diagnosis of 4WAS
controller of 4WAS front control unit
4WAS communication
line*/4WAS main control
unit/4WAS front control
unit error
C1900, C1901, C1906, C1907, C1927, C1933 4WAS MAIN CONTROL UNIT
STC-87
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1900, C1901, C1906, C1907, C1927, C1933 4WAS MAIN CONTROL UNIT
Description
INFOID:0000000000958826
• 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe functions stops the rear wheel angle (the front wheel is the steering wheel cutting angle) when
the electric components and the mechanical components are malfunctioning.
• The protection function mode stops 4WAS system intermittently when the input signal does not input to
4WAS main control unit.
• 4WAS front control unit and 4WAS main control unit control the best control of 4WAS system by 4WAS com-
munication line.
DTC Logic
INFOID:0000000000958827
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Turn the ignition switch OFF to ON.
2.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1900”, “C1901”, “C1906”, “C1907”, “C1927” or “C1933” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000000958828
1.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any DTC “C1900”, “C1901”, “C1906”, “C1907”, “C1927” or “C1933” detected?
YES
>> Replace 4WAS main control unit. Refer to
NO
>> GO TO 2.
2.
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.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1900
CONTROL UNIT
[ABNORMAL1]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1901
CONTROL UNIT
[ABNORMAL2]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1906
CONTROL UNIT
[ABNORMAL5]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1907
CONTROL UNIT
[ABNORMAL4]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1927
CONTROL UNIT
[ABNORMAL5]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1933
CONTROL UNIT
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
STC-88
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1900, C1901, C1906, C1907, C1927, C1933 4WAS MAIN CONTROL UNIT
NO
>> Replace 4WAS main control unit. Refer to
Special Repair Requirement
INFOID:0000000000958829
BEFORE REPLACING 4WAS MAIN CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Replace it without erasing 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” when erasing the memory of the self-diagnosis results (record).
C1902, C1903, C1904, C1910, C1913 4WAS REAR MOTOR OUTPUT
STC-89
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1902, C1903, C1904, C1910, C1913 4WAS REAR MOTOR OUTPUT
Description
INFOID:0000000000958830
• 4WAS rear motor activates 4WAS rear actuator.
• Maintain the toe-stiffness of rear wheels against the road external force because the irreversible sufficiency
performance hypoid gear is used.
DTC Logic
INFOID:0000000000958831
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Perform “SELF DIAGNOSTIC MODE” item on “ACTIVE TEST” of 4WAS main control unit.
CAUTION:
Perform the active test while stopping the vehicle.
2.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1902”, “C1903”, “C1904”, “C1910” or “C1913” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000000958832
1.
CHECK 4WAS REAR MOTOR CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS main control unit harness connector.
3.
Disconnect 4WAS rear motor harness connector.
4.
Check the continuity between 4WAS main control unit harness connector and 4WAS rear motor harness
connector.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1902
MOTOR OUTPUT
[REV CURRENT]
4WAS rear motor current error is detected.
(4WAS rear motor current output direction differs.)
4WAS rear motor error
C1903
MOTOR OUTPUT
[NO CURRENT]
4WAS rear motor current error is detected.
(Current is input to 4WAS main control unit if 4WAS
main control unit output is “OFF”.)
4WAS rear motor error
C1904
MOTOR OUTPUT
[OVERCURRENT]
4WAS rear motor current error is detected.
(4WAS rear motor output is overcurrent.)
4WAS rear motor error
C1910
MOTOR OUTPUT
[MOTOR LOCK]
4WAS rear motor inside error is detected.
(4WAS main motor does not move or the rear wheel an-
gle sensor does not change if 4WAS main control unit
output is 14A or more.)
4WAS rear motor error
C1913
MOTOR OUTPUT
[ABNORML SIG]
4WAS rear motor current error is detected.
(4WAS main motor does not move or the rear wheel an-
gle sensor output does not change when 4WAS main
control unit output is 18A or more, and 4WAS main mo-
tor output is low.)
4WAS rear motor error
4WAS main control unit
4WAS rear motor
Continuity
Connector
Terminal
Connector
Terminal
B54
38
B36
1
Existed
39
2
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