Infiniti FX35, FX50 (S51). Manual — part 1765
STC-1
STEERING
C
D
E
F
H
I
J
K
L
M
SECTION
STC
A
B
STC
N
O
P
CONTENTS
STEERING CONTROL SYSTEM
WITHOUT REAR ACTIVE STEER
BASIC INSPECTION . . . . . . . . .
DIAGNOSIS AND REPAIR WORK FLOW . . .
Work Flow . . . . . . . . . . . . . . . .....
SYSTEM DESCRIPTION . . . . . . . ..
EPS SYSTEM . . . . . . . . . . . . . ..
System Diagram . . . . . . . . . . . . . ....
System Description . . . . . . . . . . . . ...
Component Parts Location . . . . . . . . . ....
Component Description . . . . . . . . . . .....
DTC/CIRCUIT DIAGNOSIS . . . . . . ..
POWER SUPPLY AND GROUND CIRCUIT . ...
Description . . . . . . . . . . . . . . . ....
Diagnosis Procedure . . . . . . . . . . . .....
POWER STEERING SOLENOID VALVE . . ...
Description . . . . . . . . . . . . . . . ....
Diagnosis Procedure . . . . . . . . . . . .....
Component Inspection . . . . . . . . . . .
ENGINE SPEED SIGNAL CIRCUIT . . . . ...
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
VEHICLE SPEED SIGNAL CIRCUIT . . . . .
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
ECU DIAGNOSIS INFORMATION . . . ..
POWER STEERING CONTROL UNIT . . . ...
Reference Value . . . . . . . . . . . . . .
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - . . .
Fail-Safe . . . . . . . . . . . . . . . . ..
SYMPTOM DIAGNOSIS . . . . . . . ..
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) . . . . . ...
Description . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
PRECAUTION . . . . . . . . . . . ..
PRECAUTIONS . . . . . . . . . . . . .
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . ...
REMOVAL AND INSTALLATION . . . ...
POWER STEERING CONTROL UNIT . . . ..
Removal and Installation . . . . . . . . . . .
WITH REAR ACTIVE STEER
BASIC INSPECTION . . . . . . . . ...
DIAGNOSIS AND REPAIR WORKFLOW . .
Work Flow . . . . . . . . . . . . . . . .
Question sheet . . . . . . . . . . . . . .
SYSTEM DESCRIPTION . . . . . . . .
RAS SYSTEM . . . . . . . . . . . . ...
System Diagram . . . . . . . . . . . . . ..
System Description . . . . . . . . . . . . ..
Component Parts Location . . . . . . . . . ..
Component Description . . . . . . . . . . ...
EPS SYSTEM . . . . . . . . . . . . .
System Diagram . . . . . . . . . . . . . ..
System Description . . . . . . . . . . . . ..
Component Parts Location . . . . . . . . . ..
Component Description . . . . . . . . . . ...
DIAGNOSIS SYSTEM (RAS CONTROL UNIT)
...
STC-2
Diagnosis Description . . . . . . . . . . . .
CONSULT-III Function . . . . . . . . . . ...
DTC/CIRCUIT DIAGNOSIS . . . . . . .
C1900, C1901, C1906, C1907, C1927, C1933
RAS CONTROL UNIT . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ..
Special Repair Requirement . . . . . . . . ...
C1902, C1903, C1904, C1910, C1913 RAS
MOTOR OUTPUT . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ..
Component Inspection . . . . . . . . . . ....
Special Repair Requirement . . . . . . . . ...
C1905, C1908, C1922, C1925, C1928 RAS
CONTROL UNIT . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ..
Special Repair Requirement . . . . . . . . ...
C1909 RAS CONTROL UNIT . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ..
Special Repair Requirement . . . . . . . . ...
C1911, C1912 RAS MOTOR POWER SUP-
PLY . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ..
Component Inspection . . . . . . . . . . ....
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 SENSOR . . . ...
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1921 ENGINE SPEED SIGNAL . . . . . ..
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1923 STEERING ANGLE SENSOR . . . ...
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1924 STEERING ANGLE SENSOR . . . ...
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1926 STEERING ANGLE SENSOR . . . ...
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
C1929 ABS ACTUATOR AND ELECTRIC
UNIT (CONTROL UNIT) . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . ...
Diagnosis Procedure . . . . . . . . . . . ...
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 . . . . . . . . ...
STC-3
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D
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A
B
STC
N
O
P
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
POWER STEERING SOLENOID VALVE . . ..
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection . . . . . . . . . . .
RAS WARNING LAMP . . . . . . . . . ...
Description . . . . . . . . . . . . . . . ..
Component Function Check . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Special Repair Requirement . . . . . . . . ...
STOP LAMP SWITCH . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
Component Function Check . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection . . . . . . . . . . .
Special Repair Requirement . . . . . . . . ...
ECU DIAGNOSIS INFORMATION . . . ..
RAS CONTROL UNIT . . . . . . . . . .
Reference Value . . . . . . . . . . . . . .
Wiring Diagram - RAS SYSTEM - . . . . . . ...
Fail-Safe . . . . . . . . . . . . . . . .
DTC Inspection Priority Chart . . . . . . . ...
DTC Index . . . . . . . . . . . . . . . .
SYMPTOM DIAGNOSIS . . . . . . .
RAS WARNING LAMP DOSE NOT TURN ON .
Description . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . .
RAS WARNING LAMP DOSE NOT TURN
OFF . . . . . . . . . . . . . . . . ..
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 . . . . . . . . .
REMOVAL AND INSTALLATION . . . .
RAS CONTROL UNIT . . . . . . . . . .
Removal and Installation . . . . . . . . . ...
REAR ACTIVE STEER . . . . . . . . ...
Exploded View . . . . . . . . . . . . . ...
STC-4
< BASIC INSPECTION >
[WITHOUT REAR ACTIVE STEER]
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow
INFOID:0000000005235332
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
(VQ35HR),
(VK50VE).
3.
Check the power steering gear for damages, cracks and fluid leakage. Refer to
4.
Check the relief oil pressure. Refer to
(VK50VE).
>> 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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