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

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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 

PG-81, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

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 

LAN-75, "Diagnosis Procedure"

.

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 

BRC-9, "ADJUSTMENT OF STEER-

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 

BRC-76, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005234564

1.

CHECK STEERING ANGLE SENSOR

Check steering angle sensor. Refer to 

BRC-74, "Diagnosis Procedure"

.

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 

BRC-9, "ADJUSTMENT OF STEER-

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

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BRC

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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 

BRC-77, "Diagnosis Procedure"

.

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 

PG-81, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

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