Infiniti QX56 (Z62). Manual - part 153

C1143 STEERING ANGLE SENSOR

BRC-97

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

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G

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BRC

N

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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 

BRC-97, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222620

1.

CHECK STEERING ANGLE SENSOR MOUNTING CONDITION

Check steering angle sensor mounting condition. Refer to 

SR-14, "Exploded View"

.

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

POWER SUPPLY -"

.

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 

LAN-81, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

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]

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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 

BRC-99, "Diagnosis Procedure"

.

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 

BRC-64, "Work Procedure"

.

>> 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 

BRC-97, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

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 

BRC-138, "Exploded View"

.

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