Infiniti G37 Coupe. Manual — part 1238
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C1671 ACTUATOR ADJUSTMENT NOT
PERFORMED . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1672 INCOMPLETE ACTUATOR ADJUST-
MENT . . . . . . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1684, C1685 4WAS MAIN CONTROL UNIT
COMMUNICATION . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection [ABS Actuator and Electric
Unit (Control Unit)] . . . . . . . . . . . . ..
Component Inspection (Yaw Rate/Side G Sensor)
.
Special Repair Requirement . . . . . . . . ...
C1686 4WAS MAIN CONTROL UNIT . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
U1000, U1002 4WAS COMMUNICATION
CIRCUIT . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection [ABS Actuator and Electric
Unit (Control Unit)] . . . . . . . . . . . . ..
Component Inspection (Yaw Rate/Side G Sensor)
.
Special Repair Requirement . . . . . . . . ...
U1010 4WAS COMMUNICATION CIRCUIT . ..
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1900, C1901, C1906, C1907, C1927, C1933
4WAS MAIN CONTROL UNIT . . . . . . ...
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1902, C1903, C1904, C1910, C1913 4WAS
REAR MOTOR OUTPUT . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection (4WAS Rear Motor) . . .
Special Repair Requirement . . . . . . . . .
C1905, C1908, C1922, C1925, C1928 4WAS
MAIN CONTROL UNIT . . . . . . . . . .
Description . . . . . . . . . . . . . . . ...
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . .
C1909 4WAS MAIN CONTROL UNIT . . . ..
Description . . . . . . . . . . . . . . . ...
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . .
C1911, C1912 4WAS REAR MOTOR POWER
SUPPLY . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ...
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection (4WAS Rear Motor Relay) .
Component Inspection (Noise Suppressor) . . ...
Special Repair Requirement . . . . . . . . ..
C1914 REAR WHEEL STEERING ANGLE
SENSOR . . . . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Component Inspection . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ..
C1915, C1916 REAR WHEEL STEERING AN-
GLE SENSOR . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Component Inspection . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ..
C1917, C1918 REAR WHEEL STEERING AN-
GLE SENSOR . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Component Inspection . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ..
C1919 VEHICLE SPEED SIGNAL . . . . ..
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
C1920 STEERING ANGLE SEN . . . . . .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
STC-4
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
C1923 STEERING ANGLE SEN . . . . . .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
C1924 STEERING ANGLE SEN . . . . . .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
C1926, C1932 STEERING ANGLE SENSOR .
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
C1930 4WAS FRONT CONTROL UNIT . . ..
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
C1931 4WAS FRONT CONTROL UNIT COM-
MUNICATION . . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Component Inspection [ABS Actuator and Electric
Unit (Control Unit)] . . . . . . . . . . . . .
Component Inspection (Yaw Rate/Side G Sensor)
..
Special Repair Requirement . . . . . . . . ..
U1000 CAN COMM CIRCUIT . . . . . . ..
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
U1010 CONTROL UNIT (CAN) . . . . . ...
Description . . . . . . . . . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ..
POWER SUPPLY AND GROUND CIRCUIT ...
Description . . . . . . . . . . . . . . . .
Diagnosis Procedure (4WAS Front Control Unit) ..
Diagnosis Procedure (4WAS Main Control Unit) ...
Component Inspection (4WAS Rear Motor Relay) ..
Component Inspection (Noise Suppressor) . . ...
POWER STEERING SOLENOID VALVE . .
Description . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
Component Inspection . . . . . . . . . . ..
4WAS WARNING LAMP . . . . . . . . ..
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
Special Repair Requirement . . . . . . . . .
ECU DIAGNOSIS . . . . . . . . . ..
4WAS FRONT CONTROL UNIT . . . . . ..
Reference Value . . . . . . . . . . . . ...
Wiring Diagram - 4WAS SYSTEM - . . . . . ..
Fail Safe . . . . . . . . . . . . . . . .
DTC Inspection Priority Chart . . . . . . . ...
DTC Index . . . . . . . . . . . . . . . .
4WAS MAIN CONTROL UNIT . . . . . . .
Reference Value . . . . . . . . . . . . ...
Wiring Diagram - 4WAS SYSTEM - . . . . . ..
Fail Safe . . . . . . . . . . . . . . . .
DTC Inspection Priority Chart . . . . . . . ...
DTC Index . . . . . . . . . . . . . . . .
SYMPTOM DIAGNOSIS . . . . . . ...
4WAS SYMPTOMS . . . . . . . . . . ..
Symptom Table . . . . . . . . . . . . . .
4WAS WARNING LAMP DOES NOT TURN
ON . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
4WAS WARNING LAMP DOES NOT TURN
OFF . . . . . . . . . . . . . . . . ...
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
STEERING WHEEL MISS ALIGNMENT . . ..
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
STEERING SYSTEM VIBRATION AND
NOISE . . . . . . . . . . . . . . . ...
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) . . . . . ..
Description . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
PRECAUTION . . . . . . . . . . ...
PRECAUTIONS . . . . . . . . . . . .
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . .
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Precautions for Removal and Installation of 4WAS
Components . . . . . . . . . . . . . . ..
Precautions for Harness Repair . . . . . . .
ON-VEHICLE REPAIR . . . . . . . ...
4WAS FRONT CONTROL UNIT . . . . . ..
Exploded View . . . . . . . . . . . . . ..
Removal and Installation . . . . . . . . . ...
4WAS MAIN CONTROL UNIT . . . . . .
Exploded View . . . . . . . . . . . . . ...
Removal and Installation . . . . . . . . . ...
4WAS FRONT ACTUATOR ASSEMBLY . ...
Removal and Installation . . . . . . . . . ...
4WAS REAR ACTUATOR ASSEMBLY . . .
Exploded View . . . . . . . . . . . . . ...
STC-6
< BASIC INSPECTION >
[WITHOUT 4WAS]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
INFOID:0000000001666266
DETAILED FLOW
1.
COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.
CAUTION:
Customers are not professional. It is dangerous to make an easy guess like “maybe the customer
means that...,” or “maybe the customer mentions this symptom”.
>> GO TO 2.
2.
CHECK THE STATUS
1.
Power steering fluid leakage and check the power steering fluid level. Refer to
2.
Check the drive belt tension. Refer to
.
3.
Check the power steering gear for damages, cracks and fluid leakage. Refer to
4.
Check the relief oil pressure. Refer to
>> GO TO 3.
3.
DIAGNOSIS CHART BY SYMPTOM
Perform the diagnosis by symptom. Refer to
>> GO TO 4.
4.
FINAL CHECK
Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?
YES
>> INSPECTION END
NO
>> GO TO 2.
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