Infiniti FX35, FX50 (S51). Manual — part 1780
C1915, C1916 REAR WHEEL STEERING ANGLE SENSOR
STC-61
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1915”, “C1916” or “RAS warning lamp flickering pattern:24” detected?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
NO
>> GO TO 7.
7.
CHECK INFORMATION
With CONSULT-III
1.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data standard?
YES
>> Check pin terminal and connection of each harness connector for non-standard conditions.
NO
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
Component Inspection
INFOID:0000000005549692
1.
CHECK REAR WHEEL STEERING ANGLE SENSOR
1.
Turn the ignition switch OFF.
2.
Disconnect rear wheel steering angle sensor harness connector.
3.
Check the resistance between rear wheel steering angle sensor connector.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace RAS actuator assembly. Refer to
.
Special Repair Requirement
INFOID:0000000005549693
BEFORE REPLACING RAS CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing RAS 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”.
Rear wheel steering angle sensor
Resistance (Approx.)
Terminal
1
4
1 k
Ω
1
2
1.2 – 1.5 k
Ω
1
3
1.2 – 1.5 k
Ω
STC-62
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR
C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR
Description
INFOID:0000000005549694
• It detects the steering angle condition of rear wheel.
• 2 systems (main and sub sensor) are equipped.
DTC Logic
INFOID:0000000005549695
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1917”, “C1918” or “RAS warning lamp flickering pattern:24” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005549696
1.
CHECK REAR WHEEL STEERING ANGLE SENSOR (1)
With CONSULT-III
1.
Start the engine.
CAUTION:
Check condition with the vehicle stopped.
2.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
3.
Check “RR ST ANG-MAI” and “RR ST ANG-SUB” item on “DATA MONITOR” of RAS control unit.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace RAS actuator assembly. Refer to
.
2.
CHECK REAR WHEEL STEERING ANGLE SENSOR (2)
Check the voltage between RAS control unit harness connector and ground.
DTC
Display items
Malfunction detected condition
Possible cause
C1917
RR ST ANGLE SENSOR
[OFFSET SIG1]
The output signal value differs temporarily between
rear wheel steering angle sensor (main) and (sub).
• RAS actuator assembly
(Rear wheel angle sen-
sor)
• Harness or connector
• RAS control unit
C1918
RR ST ANGLE SENSOR
[OFFSET SIG2]
The output signal value differs between rear wheel
steering angle sensor (main) and (sub).
• RAS actuator assembly
(Rear wheel angle sen-
sor)
• Harness or connector
• RAS control unit
Monitored item
Condition
Display value
RR ST ANG-MAI
Straight-ahead
Approx. 2.4 V
RR ST ANG-SUB
Straight-ahead
Approx. 2.6 V
C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR
STC-63
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is the differential between terminal voltage No. 4 and No.7 approximately 1 V or more?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
NO
>> GO TO 3.
3.
CHECK REAR WHEEL STEERING ANGLE SENSOR (3)
Check the rear wheel steering angle sensor. Refer to
STC-64, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace RAS actuator assembly. Refer to
.
4.
CHECK REAR WHEEL STEERING ANGLE SENSOR GROUND CIRCUIT
1.
Disconnect RAS control unit harness connector.
2.
Check for continuity between RAS control unit harness connector terminal and rear wheel steering angle
sensor harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace each harness and connector.
5.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1917”, “C1918” or “RAS warning lamp flickering pattern:24” detected?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
NO
>> GO TO 6.
6.
CHECK INFORMATION
With CONSULT-III
1.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data standard?
YES
>> Check pin terminal and connection of each harness connector for non-standard conditions.
NO
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
RAS control unit
—
Voltage (Approx.)
Connector
Terminal
B37
4
Ground
2.4 V
7 2.6
V
RAS control unit
Rear wheel steering angle sensor
Continuity
Connector
Terminal
Connector
Terminal
B37
4
B53
1, 2, 4
Not existed
4
3
Existed
7
1, 3, 4
Not existed
7
2
Existed
5
2, 3, 4
Not existed
5
1
Existed
15
1, 2, 3
Not existed
15
4
Existed
STC-64
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR
Component Inspection
INFOID:0000000005549697
1.
CHECK REAR WHEEL STEERING ANGLE SENSOR (3)
1.
Turn the ignition switch OFF.
2.
Disconnect rear wheel steering angle sensor harness connector.
3.
Check resistance between rear wheel steering angle sensor connector.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace RAS actuator assembly. Refer to
.
Special Repair Requirement
INFOID:0000000005549698
BEFORE REPLACING RAS CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing RAS 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”.
Rear wheel steering angle sensor
Resistance (Approx.)
Terminal
1 4
1
k
Ω
1
2
1.2 – 1.5 k
Ω
1
3
1.2 – 1.5 k
Ω
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