Infiniti G37 Coupe. Manual — part 1262
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
STC-99
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace the noise suppressor.
8.
CHECK 4WAS REAR MOTOR POWER SUPPLY
1.
Install 4WAS rear motor relay.
2.
Install the noise suppressor.
3.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
4.
Check the voltage between 4WAS main control unit harness connectors and the ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace 4WAS main control unit. Refer to
9.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1911” or “C1912” detected?
YES
>> Replace 4WAS main control unit. Refer to
NO
>> GO TO 10.
10.
CHECK INFORMATION
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 each harness connector pin terminal for disconnection.
NO
>> Replace 4WAS main control unit. Refer to
Component Inspection (4WAS Rear Motor Relay)
INFOID:0000000001666408
1.
CHECK 4WAS REAR MOTOR RELAY
1.
Turn the ignition switch OFF.
2.
Remove 4WAS rear motor relay connector.
3.
Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.
CAUTION:
• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.
4.
Check the continuity between 4WAS rear motor relay connector terminals.
Noise suppressor
Continuity
Connector
Terminal
Connector
Terminal
B51
3
B52
1
Existed
B51
3
B51
5
Not existed
B51
3
B52
2
Not existed
B51
5
B52
2
Existed
B51
5
B52
1
Not existed
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
37 – Ground
Battery voltage
STC-100
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
5.
Check the resistance between 4WAS rear motor relay connector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace 4WAS rear motor relay.
Component Inspection (Noise Suppressor)
INFOID:0000000001666409
1.
NOISE SUPPRESSOR INSPECTION
1.
Turn the ignition switch OFF.
2.
Remove the noise suppressor.
3.
Check continuity between the noise suppressor connector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace the noise suppressor.
Special Repair Requirement
INFOID:0000000001666410
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”.
4WAS rear motor relay
Continuity
Connector
Terminal
Condition
B53
3 – 5
Apply the voltage between
No. 1 terminal and No. 2 ter-
minal.
Existed
Do not apply the voltage be-
tween No. 1 terminal and
No. 2 terminal.
Not existed
4WAS rear motor relay
Resistance (Approx.)
Connector
Terminal
B53
1 – 2
50
Ω
Noise suppressor
Continuity
Connector
Terminal
Connector
Terminal
B51
3
B52
1
Existed
B51
3
B51
5
Not existed
B51
3
B52
2
Not existed
B51
5
B52
2
Existed
B51
5
B52
1
Not existed
C1914 REAR WHEEL STEERING ANGLE SENSOR
STC-101
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1914 REAR WHEEL STEERING ANGLE SENSOR
Description
INFOID:0000000001666411
• It detects the steering angle condition of rear wheel.
• 2 systems (main and sub sensor) are equipped.
DTC Logic
INFOID:0000000001666412
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 “C1914” detected?
YES
>> Proceed to diagnosis procedure. Refer to
STC-101, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666413
1.
CHECK REAR WHEEL STEERING ANGLE SENSOR POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Check the voltage between 4WAS main control unit harness connector terminal and the ground.
3.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
4.
Check the voltage between 4WAS main control unit harness connector terminal and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace 4WAS main control unit. Refer to
2.
CHECK REAR WHEEL STEERING ANGLE SENSOR
1.
Turn the ignition switch OFF.
2.
Disconnect the rear wheel steering angle sensor harness connector.
3.
Check the resistance between the rear wheel steering angle sensor connector terminals.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1914
RR ST ANGLE SENSOR
[ABNORML VOL]
The rear wheel angle sensor power supply error is de-
tected.
Rear wheel steering sen-
sor power supply error
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
5 – Ground
0 V
4WAS main control unit
Value (Approx.)
Connector
Terminal
B54
5 – Ground
5 V
STC-102
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1914 REAR WHEEL STEERING ANGLE SENSOR
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace 4WAS rear actuator. Refer to
3.
CHECK REAR WHEEL STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect 4WAS main control unit harness connector.
2.
Check the continuity between 4WAS main control unit harness connector terminal and the rear wheel
steering angle sensor harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace the harnesses and connectors.
4.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
1.
Connect 4WAS main control unit harness connector.
2.
Connect the rear wheel steering angle sensor harness connector.
3.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1914” detected?
YES
>> Replace 4WAS main control unit. Refer to
NO
>> GO TO 5.
5.
CHECK INFORMATION
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 each harness connector pin terminal for disconnection.
NO
>> Replace 4WAS main control unit. Refer to
Component Inspection
INFOID:0000000001666414
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 terminals.
Rear wheel steering angle sensor
Resistance (Approx.)
Connector
Terminal
B35
1 – 3
1 k
Ω
1 – 2
1.2 – 1.5 k
Ω
1 – 4
1.2 – 1.5 k
Ω
4WAS main control unit
Rear wheel steering angle
sensor
Continuity
Connector
Terminal
Connector
Terminal
B54
5
B35
1
Existed
B54
5
B35
3
Not existed
B54
15
B35
3
Existed
B54
15
B35
1
Not existed
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