Infiniti FX35, FX50 (S51). Manual — part 261
C1143 STEERING ANGLE SENSOR
BRC-75
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
1.
Turn the ignition switch OFF.
2.
Check 10 A fusible link (45).
3.
Disconnect IPDM E/R harness connector.
4.
Check continuity between steering angle sensor harness connector and IPDM E/R harness connector.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
4.
CHECK STEERING ANGLE SENSOR GROUND
Check continuity between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK DATA LINE
Check “STRG BRANCH CIRCUIT”. Refer to
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit).
NO
>> Repair or replace error-detected parts.
Special Repair Requirement
INFOID:0000000005234562
1.
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering
angle sensor or the ABS actuator and electric unit (control unit). Refer to
ING ANGLE SENSOR NEUTRAL POSITION : Description"
>> END
Steering angle sensor
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M37
8
E5
25
Existed
Steering angle sensor
—
Continuity
Connector
Terminal
M37
7
Ground
Existed
BRC-76
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C1144 STEERING ANGLE SENSOR
C1144 STEERING ANGLE SENSOR
DTC Logic
INFOID:0000000005234563
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
1.
Turn the ignition switch ON.
2.
Select “ABS”, “WORK SUPPORT” and “ST ANGLE SENSOR ADJUSTMENT” in order with CONSULT-III,
and perform adjust the neutral position of steering angle sensor.
3.
Perform self-diagnosis for “ABS” with CONSULT-III.
Is DTC “C1144” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005234564
1.
CHECK STEERING ANGLE SENSOR
Check steering angle sensor. Refer to
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit).
NO
>> Repair or replace error-detected parts.
Special Repair Requirement
INFOID:0000000005528333
1.
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering
angle sensor or the ABS actuator and electric unit (control unit). Refer to
ING ANGLE SENSOR NEUTRAL POSITION : Description"
>> END
DTC
Display item
Malfunction detected condition
Possible cause
C1144
ST ANG SEN SIGNAL
Neutral position of steering angle sensor is not finished.
• Harness or connector
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
C1145, C1146 YAW RATE/SIDE G SENSOR
BRC-77
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1145, C1146 YAW RATE/SIDE G SENSOR
Description
INFOID:0000000005234566
The yaw rate/side G sensor detects the yaw rate/side G affecting the vehicle, and transmits the data to the
ABS actuator and electric unit (control unit) as an analog voltage signal.
DTC Logic
INFOID:0000000005234567
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
1.
Turn the ignition switch ON.
2.
Perform self-diagnosis for “ABS” with CONSULT-III.
Is DTC “C1145” or “C1146” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005234568
CAUTION:
• Sudden turns (such as spin turns, acceleration turns), drifting, etc., when VDC function is off (VDC
OFF switch “ON”) may cause yaw rate/side G sensor system to indicate a malfunction. However, this
is not a malfunction, if normal operation can be resumed after restarting engine. Then erase memory
of self-diagnosis.
• If vehicle is on turn-table at entrance to parking garage, or on other moving surface, VDC OFF indica-
tor lamp may illuminate and CONSULT-III self-diagnosis may indicate yaw rate sensor system mal-
function. However, in this case there is no malfunction in yaw rate sensor system. Take vehicle off of
turn-table or other moving surface, and start the engine. Results will return to normal.
1.
CHECK CONNECTOR
1.
Turn the ignition switch OFF.
2.
Disconnect ABS actuator and electric unit (control unit) harness connector.
3.
Disconnect yaw rate/side G sensor harness connector.
4.
Check terminal for deformation, disconnection, looseness, etc.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK YAW RATE/SIDE G SENSOR POWER SUPPLY
1.
Check the voltage between yaw rate/side G sensor harness connector and ground.
2.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
3.
Check the voltage between yaw rate/side G sensor harness connector and ground.
DTC
Display item
Malfunction detected condition
Possible cause
C1145
YAW RATE SENSOR
Yaw rate sensor is malfunctioning, or the yaw rate sensor
signal line is open or shorted.
• Harness or connector
• ABS actuator and electric unit
(control unit)
• Yaw rate/side G sensor
C1146
SIDE G-SEN CIRCUIT
Side G sensor is malfunctioning, or circuit of side G sen-
sor is open or shorted.
Yaw rate/side G sensor
—
Condition
Voltage
Connector
Terminal
M143
4
Ground
Ignition switch: OFF
Approx. 0 V
BRC-78
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C1145, C1146 YAW RATE/SIDE G SENSOR
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK YAW RATE/SIDE G SENSOR POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 10 A fusible link (45).
3.
Disconnect IPDM E/R harness connector.
4.
Check the continuity between yaw rate/side G sensor harness connector and IPDM E/R harness connec-
tor.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
.
NO
>> Repair or replace error-detected parts.
4.
CHECK YAW RATE/SIDE G SENSOR GROUND CIRCUIT
Check the continuity between yaw rate/side G sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK YAW RATE/SIDE G SENSOR HARNESS
Check the continuity between yaw rate/side G sensor harness connector and ABS actuator and electric unit
(control unit) harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts. Refer to
BRC-129, "Precautions for Harness Repair"
.
6.
REPLACE YAW RATE/SIDE G SENSOR
1.
Replace yaw rate/side G sensor.
2.
Erase self-diagnosis results for “ABS” with CONSULT-III.
3.
Turn the ignition switch OFF.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Perform self-diagnosis for “ABS” with CONSULT-III.
Is DTC “C1145”, “C1146” detected?
Yaw rate/side G sensor
—
Condition
Voltage
Connector
Terminal
M143
4
Ground
Ignition switch: ON
Battery voltage
Yaw rate/side G sensor
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M143
4
E5
25
Existed
Yaw rate/side G sensor
—
Continuity
Connector
Terminal
M143
1
Ground
Existed
ABS actuator and electric unit (control unit)
Yaw rate/side G sensor
Continuity
Connector
Terminal
Connector
Terminal
E41
25
M143
2
Existed
45
3
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