Infiniti G37 Coupe. Manual — part 1260
C1902, C1903, C1904, C1910, C1913 4WAS REAR MOTOR OUTPUT
STC-91
< 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 rear actuator. Refer to
.
Special Repair Requirement
INFOID:0000000001666396
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”.
4WAS rear motor
Continuity
Connector
Terminal
B36
1 – 2
Existed
STC-92
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT
C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT
Description
INFOID:0000000001878370
• 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe functions stops the rear wheel angle function (the front wheel is the steering wheel cutting
angle) when the electric components and the mechanical components are malfunctioning.
• The protective function stops 4WAS system temporarily when the input signal is not inputted to 4WAS main
control unit (When battery-power dose not work temporarily).
• 4WAS front control unit and 4WAS main control unit perform two-way transmitting/receiving signals for opti-
mal control of 4WAS system via 4WAS communication line.
DTC Logic
INFOID:0000000001666398
DTC DETECTION LOGIC
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 any DTC “C1905”, “C1908”, “C1922”, “C1925” or “C1928” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666399
1.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any DTC “C1905”, “C1908”, “C1922”, “C1925” or “C1928” 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.
NO
>> Replace 4WAS main control unit. Refer to
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1905
CONTROL UNIT
[ABNORMAL3]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1908
CONTROL UNIT
[ABNORMAL7]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1922
CONTROL UNIT
[ABNORMAL8]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1925
AD CONVERTER
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1928
CONTROL UNIT
[ABNORMAL9]
An error is detected inside 4WAS main control unit.
4WAS main control unit
error
C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT
STC-93
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Special Repair Requirement
INFOID:0000000001666400
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”.
STC-94
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1909 4WAS MAIN CONTROL UNIT
C1909 4WAS MAIN CONTROL UNIT
Description
INFOID:0000000001878371
• 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe functions stops the rear wheel angle function (the front wheel is the steering wheel cutting
angle) when the electric components and the mechanical components are malfunctioning.
• The protective function stops 4WAS system temporarily when the input signal is not inputted to 4WAS main
control unit (When battery-power dose not work temporarily).
• 4WAS front control unit and 4WAS main control unit perform two-way transmitting/receiving signals for opti-
mal control of 4WAS system via 4WAS communication line.
DTC Logic
INFOID:0000000001666402
DTC DETECTION LOGIC
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 “C1909” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666403
1.
CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS main control unit harness connector.
3.
Check the voltage between 4WAS main control unit harness connector terminal and the ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between 4WAS main control unit harness connector terminal and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NG
>>
Check the following items. Repair or replace the malfunctioning parts.
• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 ter-
minal and the ground
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1909
CONTROL UNIT
[ABNORMAL6]
An error is detected inside 4WAS main control unit.
4WAS main control unit
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
27 – Ground
0 V
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
27 – Ground
Battery voltage
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