Infiniti G37 Coupe. Manual — part 1266
C1921 ENGINE SPEED SIGNAL
STC-115
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1921 ENGINE SPEED SIGNAL
Description
INFOID:0000000001666434
• The engine speed signal is transmitted to 4WAS main control unit via CAN communication.
DTC Logic
INFOID:0000000001666435
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 “C1921” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-115, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666436
1.
PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
Perform ECM 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 “C1921” detected?
YES
>> Replace 4WAS main control unit. 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
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1921
ENG REV SIGNAL
Malfunction is detected in engine speed signal that is
output from ECM via CAN communication.
(Improper signal is input engine speed.)
Engine speed signal error
STC-116
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1921 ENGINE SPEED SIGNAL
Special Repair Requirement
INFOID:0000000001666437
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”.
C1923 STEERING ANGLE SEN
STC-117
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1923 STEERING ANGLE SEN
Description
INFOID:0000000001878424
• Steering angle sensor signal is transmitted from steering angle sensor to 4WAS main control unit via CAN
communication.
DTC Logic
INFOID:0000000001666439
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Drive at 60 km/h (38MPH) or more for 3 minutes or more.
2.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1923” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-117, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666440
1.
PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
Perform ABS actuator and electric 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 “C1923” detected?
YES
>> Replace 4WAS main control unit. 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?
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1923
STEERING ANGLE SEN
[NO CHANGE]
Malfunction is detected in steering angle sensor signal
that is output from steering angle sensor via CAN com-
munication.
[Steering angle sensor input signal error is detected
when driving at 60 km/h (37MPH) or more.]
Steering angle sensor in-
put signal error
STC-118
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1923 STEERING ANGLE SEN
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:0000000001666441
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)
>> 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.
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