Infiniti QX56 (Z62). Manual — part 153
C1143 STEERING ANGLE SENSOR
BRC-97
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1143 STEERING ANGLE SENSOR
DTC Logic
INFOID:0000000006222619
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1143” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222620
1.
CHECK STEERING ANGLE SENSOR MOUNTING CONDITION
Check steering angle sensor mounting condition. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK STEERING ANGLE SENSOR POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect steering angle sensor harness connector.
3.
Check voltage between steering angle sensor harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start engine.
5.
Check voltage between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 10A fuse (#7).
DTC
Display Item
Malfunction detected condition
Possible causes
C1143
ST ANG SEN CIRCUIT
When a malfunction is detected in steering angle sen-
sor.
• Harness or connector
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
• Fuse
• Ignition power supply system
• CAN communication line
Steering angle sensor
—
Voltage
Connector
Terminal
M30
4
Ground
Approx. 0 V
Steering angle sensor
—
Voltage
Connector
Terminal
M30
4
Ground
Battery voltage
BRC-98
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1143 STEERING ANGLE SENSOR
3.
Disconnect fuse block (J/B) harness connector.
4.
Check continuity between steering angle sensor harness connector and fuse block (J/B) harness connec-
tor.
5.
Check continuity between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES
>> Perform trouble diagnosis for ignition power supply. Refer to
PG-89, "Wiring Diagram - IGNITION
NO
>> Repair or replace error-detected parts.
4.
CHECK STEERING ANGLE SENSOR GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
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 TERMINAL
• Check steering angle sensor pin terminals for damage or loose connection with harness connector.
• Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK CAN COMMUNICATION LINE
Check “STRG BRANCH LINE CIRCUIT”. Refer to
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
NO
>> Repair or replace error-detected parts. Refer to
BRC-7, "Precaution for Harness Repair"
.
Steering angle sensor
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M30
4
M1
2A
Existed
Steering angle sensor
—
Continuity
Connector
Terminal
M30
4
Ground
Not existed
Steering angle sensor
—
Continuity
Connector
Terminal
M30
1
Ground
Existed
C1144 INCOMPLETE STEERING ANGLE SENSOR ADJUSTMENT
BRC-99
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1144 INCOMPLETE STEERING ANGLE SENSOR ADJUSTMENT
DTC Logic
INFOID:0000000006222621
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1144” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222622
1.
ADJUST THE NEUTRAL POSITION OF STEERING ANGLE SENSOR
Perform neutral position adjustment of steering angle sensor. Refer to
>> GO TO 2.
2.
CHECK ABS ACTUATOR AND ERECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
Perform self-diagnosis for “ABS”.
Is DTC “C1144” detected?
YES
>> GO TO 3.
NO
>> INSPECTION END
3.
CHECK STEERING ANGLE SENSOR SYSTEM
1.
Turn the ignition switch OFF.
2.
Check steering angle sensor system. Refer to
.
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
NO
>> Repair or replace error-detected parts.
DTC
Display Item
Malfunction detected condition
Possible causes
C1144
ST ANG SEN SIGNAL
When neutral position adjustment of steering angle
sensor is not complete.
• Harness or connector
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
• Incomplete neutral position ad-
justment of steering angle sen-
sor
BRC-100
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
DTC Logic
INFOID:0000000006222623
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1145” or “C1146” detected?
YES
>> Proceed to diagnosis procedure. Refer to
BRC-100, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222624
CAUTION:
• A malfunction in yaw rate/side/decel G sensor system may be detected when the vehicle sharply
turns during a spin turn, acceleration turn or drift driving while VDC function is OFF (VDC OFF indi-
cator lamp is in ON status). This is not a malfunction if the status returns to normal after engine is
started again. In that case, erase self-diagnosis result memory using CONSULT-III.
• When the engine is in running status and the vehicle is on a turntable at the entrance of parking lot
or on a moving unit, VDC warning lamp may turn ON and “ABS” self-diagnosis may display “YAW
RATE SENSOR”. In this case, yaw rate sensor is not malfunctioning. The status returns to normal
when the vehicle is left from the turntable or moving unit and the engine is started again. In that
case, erase self-diagnosis result memory using CONSULT-III.
1.
CHECK YAW RATE/SIDE/DECEL G SENSOR MOUNTING CONDITION
Check yaw rate/side/decel G sensor mounting condition. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect yaw rate/side/decel G sensor harness connector.
3.
Check voltage between yaw rate/side/decel G sensor harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start engine.
5.
Check voltage between yaw rate/side/decel G sensor harness connector and ground.
DTC
Display Item
Malfunction detected condition
Possible causes
C1145
YAW RATE SENSOR
• When a malfunction is detected in yaw rate signal.
• When yaw rate signal is not continuously received
for 2 seconds or more.
• When side G signal is not continuously received for
2 seconds or more.
• When decel G signal is not continuously received
for 2 seconds or more.
• Harness or connector
• Yaw rate/side/decel G sensor
• ABS actuator and electric unit
(control unit)
• Ignition power supply system
• Fuse
C1146
SIDE G-SEN CIRCUIT
When a malfunction is detected in side/decel G sig-
nal.
Yaw rate/side/decel G sensor
—
Voltage
Connector
Terminal
M55
3
Ground
Approx. 0 V
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