Infiniti G37 Coupe. Manual — part 1279
4WAS MAIN CONTROL UNIT
STC-167
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1925
AD CONVERTER
C1926
STEERING ANGLE SEN
C1927
CONTROL UNIT
[ABNORMAL5]
C1928
CONTROL UNIT
[ABNORMAL9]
C1930
4WAS FRONT ECU
C1931
4WAS FRONT ECU COMM
C1932
STEERING ANGLE SEN
C1933
CONTROL UNIT
U1000
CAN COMM
U1010
CONTROL UNIT (CAN)
DTC
Items
(CONSULT-III screen terms)
Reference
STC-168
< SYMPTOM DIAGNOSIS >
[WITH 4WAS]
4WAS SYMPTOMS
SYMPTOM DIAGNOSIS
4WAS SYMPTOMS
Symptom Table
INFOID:0000000001666488
If 4WAS warning lamp turns ON, perform self-diagnosis
Symptom
Condition
Check item
Reference
4WAS warning lamp does not turn on.
(4WAS warning lamp does not turn ON
when turning ignition switch ON from OFF)
Ignition switch: ON
4WAS system power supply and ground
Unified meter and A/C amp.
CAN communication line
Combination meter
4WAS main control unit
4WAS warning lamp does not turn off.
Engine running
4WAS main control unit self-diagnosis
4WAS front control unit self-diagnosis
Steering wheel miss alignment
(The steering wheel position (center) is in
the wrong position at driving)
Driving
Return to 4WAS front actuator initial po-
sition
4WAS system condition
Steering system
Wheel alignment
4WAS front actuator adjustment
4WAS system ignition power supply
4WAS system 4WAS front motor power
supply
4WAS system incomplete lock release
4WAS system history inspection
Steering system vibration and noise
(Vibration or noise occurs in the steering
wheel while driving the vehicle.)
Driving
4WAS system protection function mode
4WAS front actuator control stopped
Unbalance steering wheel turning force
(torque variation)
Driving
Vehicle speed signal
Steering system
Power steering solenoid valve
4WAS WARNING LAMP DOES NOT TURN ON
STC-169
< SYMPTOM DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
4WAS WARNING LAMP DOES NOT TURN ON
Description
INFOID:0000000001666489
• 4WAS warning lamp does not turn ON when turning ignition switch ON from OFF.
Diagnosis Procedure
INFOID:0000000001666490
1.
CHECK 4WAS SYSTEM POWER SUPPLY AND GROUND CIRCUIT
With CONSULT-III
Perform the trouble diagnosis of the power supply and ground circuit.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the specific malfunctioning part.
2.
CHECK 4WAS WARNING LAMP
With CONSULT-III
Perform the trouble diagnosis of 4WAS warning lamp. Refer to
STC-140, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> Check that there is no malfunction in each harness connector pin terminal or disconnection.
NO
>> Repair or replace the specific malfunctioning part.
STC-170
< SYMPTOM DIAGNOSIS >
[WITH 4WAS]
4WAS WARNING LAMP DOES NOT TURN OFF
4WAS WARNING LAMP DOES NOT TURN OFF
Description
INFOID:0000000001666491
• 4WAS system stops (error) when turning 4WAS warning lamp ON.
Diagnosis Procedure
INFOID:0000000001666492
1.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any DTC detected other than “C1930” or “C1931”?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
PERFORM TROUBLE DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
1.
Check the error system detected from the self-diagnosis.
2.
Perform 4WAS main control unit self-diagnosis again after the inspection.
Is any error system detected?
YES
>> Check the error system.
NO
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is any error system detected?
YES
>> Check the error system.
NO
>> GO TO 4.
4.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any error system detected?
YES
>> Check the error system.
NO
>> Check that there is no malfunction in each harness connector pin terminal or disconnection.
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