Infiniti G37 Coupe. Manual — part 1268
C1926, C1932 STEERING ANGLE SENSOR
STC-123
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
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STC
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C1926, C1932 STEERING ANGLE SENSOR
Description
INFOID:0000000001878426
• Steering angle sensor signal is transmitted from steering angle sensor to 4WAS main control unit via CAN
communication.
DTC Logic
INFOID:0000000001666447
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Turn the steering wheel leftward slowly. Steer until the turning stops.
3.
Turn the steering wheel rightward slowly. Steer to the straight-forward position.
4.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1926” or “C1932” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-123, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666448
1.
PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
Perform ABS actuator and electrical unit (control unit) self-diagnosis.
Is any error system detected?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis
Is DTC “U1000” or “U1010” detected?
YES
>> Check the error system.
NO
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis
Is DTC “C1926” or “C1932” detected?
C1926 >> Replace 4WAS main control unit. Refer to
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1926
STEERING ANGLE SEN
Malfunction is detected in steering angle sensor signal
that is output from steering angle sensor via CAN com-
munication.
(When improper signal inputs to steering angle sensor
and steering angle sensor itself detects the malfunc-
tion)
Steering angle sensor er-
ror
C1932
STEERING ANGLE SEN
If the steering angle sensor error is detected.
(Steering angle sensor output value is abnormal.)
Steering angle sensor in-
put signal error
STC-124
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1926, C1932 STEERING ANGLE SENSOR
C1932 >> Replace steering angle sensor. Refer to
.
NO
>> GO TO 4.
4.
INFORMATION CHECK
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 that there is no malfunction in each harness connector pin terminal or disconnection.
NO
>> Replace 4WAS main control unit. Refer to
Special Repair Requirement
INFOID:0000000001666449
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 STEERING ANGLE SENSOR
1.
PERFORM ACTIVE TEST (LOCK OPERATION)
With CONSULT-III
1.
Stop vehicle with front wheels in the straight-ahead position.
2.
Turn the ignition switch ON.
CAUTION:
Never start engine.
3.
Select “LOCK OPERATION” item on “ACTIVE” of 4WAS front control unit.
4.
Perform “RELEASE” of “ACTIVE TEST”.
CAUTION:
• Turn steering wheel 90
°
, and then check that front tire does not move.
• Never turn steering wheel 1 turn or more while performing “RELEASE”.
5.
Place steering wheel in neutral position.
6.
Perform “LOCK” item on “ACTIVE TEST” of 4WAS front control unit.
7.
Steer 30
°
leftward slowly. Steer 30
°
rightward and return the steering wheel to the straight-ahead position.
8.
Complete active test of 4WAS front control unit.
>> GO TO 2.
2.
STEERING ANGLE SENSOR NEUTRAL POSITION ADJUSTMENT
With CONSULT-III
1.
Adjust steering angle sensor neutral position. Refer to
BRC-8, "ADJUSTMENT OF STEERING ANGLE
SENSOR NEUTRAL POSITION : Special Repair Requirement"
.
2.
Turn the ignition switch OFF.
>> GO TO 3.
3.
RETURN TO 4WAS FRONT ACTUATOR INITIAL POSITION
1.
Start engine.
CAUTION:
Check condition with the vehicle stopped.
2.
Turn steering wheel to the left by 90
°
slowly, and then turn to the right by 90
°
.
3.
Again, turn steering wheel to the left by 90
°
slowly, and then turn to the right by 90
°
so that it faces straight
ahead.
4.
Stop vehicle with front wheels in the straight-ahead position after driving vehicle for a short time. (Engine
starting)
C1926, C1932 STEERING ANGLE SENSOR
STC-125
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
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STC
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>> GO TO 4.
4.
CHECK 4WAS FRONT ACTUATOR
With CONSULT-III
1.
Check “4WAS STR ANG” item on “DATA MONITOR” of 4WAS front control unit.
CAUTION:
Never touch steering wheel while performing.
2.
Turn the ignition switch OFF.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 1.
5.
PERFORM ACTIVE TEST (SLOW MODE)
With CONSULT-III
1.
Start engine.
CAUTION:
Check condition with the vehicle stopped.
2.
Select “SLOW MODE” item on “ACTIVE TEST” of 4WAS front control unit.
3.
Perform “MODE START” of “ACTIVE TEST”.
4.
Turn steering wheel to the left slowly until it stops.
5.
Turn steering wheel to the right slowly until it stops.
Does “OK” display on both the left and right sides on “SLOW MODE” items of the monitor?
YES
>> GO TO 6.
NO
>> Refer to
STC-30, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special
Repair Requirement (Pattern 4)"
6.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is malfunction detected?
YES
>> Check malfunctioning circuit.
NO
>> GO TO 7.
7.
ERASE ERROR RECORD
With CONSULT-III
Erase memories of self-diagnosis results for 4WAS front control unit and 4WAS main control unit.
>> END
4WAS STR ANG
:
−
3.5 – 3.5deg
STC-126
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1930 4WAS FRONT CONTROL UNIT
C1930 4WAS FRONT CONTROL UNIT
Description
INFOID:0000000001666450
• It transmits the value calculated by 4WAS main control unit to 4WAS front control unit via 4WAS communica-
tion line (line for 4WAS system only). 4WAS front control unit controls 4WAS front actuator according to the
received command value.
DTC Logic
INFOID:0000000001666451
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 “C1930” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-126, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666452
1.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any DTC other than “C1930” detected?
YES
>> Check the error system.
NO
>> Perform 4WAS front control unit self-diagnosis.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1930
4WAS FRONT ECU
An error is detected on 4WAS front control unit side.
(4WAS front control unit fail-safe mode)
4WAS front control unit
fail-safe mode
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