Infiniti FX35, FX50 (S51). Manual - part 260

C1137 RAS CIRCUIT

BRC-71

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1137 RAS CIRCUIT

Description

INFOID:0000000005234549

The ABS actuator and electric unit (control unit) and the RAS control unit exchange signals via the CAN com-
munication line.

DTC Logic

INFOID:0000000005234550

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 “C1137” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-71, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005234551

1.

CHECK RAS CONTROL UNIT

Perform self-diagnosis for “4WAS(MAIN)/RAS/HICAS” with CONSULT-III.

Is any item indicated on the self-diagnosis display?

YES

>> Repair or replace error-detected parts.

NO

>> GO TO 2.

2.

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

1.

Erase self-diagnosis results for “ABS” with CONSULT-III.

2.

Turn the ignition switch OFF.

3.

Start the engine. Drive the vehicle for a while.

4.

Make sure that RAS warning lamp turns OFF.

5.

Stop the engine. Perform self-diagnosis for “ABS” with CONSULT-III.

Is any item indicated on the self-diagnosis display?

YES

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

NO

>> Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection

with harness connector. If any items and damaged, repair or replace error-detected parts.

Special Repair Requirement

INFOID:0000000005528316

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-9, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

DTC

Display item

Malfunction detected condition

Possible cause

C1137

RAS CIRCUIT

When RAS control unit is malfunction.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• RAS control unit
• CAN communication line

BRC-72

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

C1142 PRESS SENSOR

C1142 PRESS SENSOR

Description

INFOID:0000000005234553

The pressure sensor converts the brake fluid pressure to an electric signal and transmits it to the ABS actuator
and electric unit (control unit). [The pressure sensor is integrated in the ABS actuator and electric unit (control
unit).]

DTC Logic

INFOID:0000000005234554

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 “C1142” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-72, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005234555

1.

CHECK STOP LAMP SWITCH

Check stop lamp switch system. Refer to 

BRC-64, "Diagnosis Procedure"

. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunction component.

2.

CHECK BRAKE SYSTEM

1.

Check brake fluid leakage: Refer to 

BR-10, "Inspection"

.

2.

Check front brake piping: Refer to 

BR-24, "FRONT : Inspection"

.

3.

Check rear brake piping: Refer to 

BR-28, "REAR : Inspection"

.

4.

Check brake pedal: Refer to 

BR-19, "Inspection and Adjustment"

.

5.

Check master cylinder: Refer to 

BR-32, "Inspection"

.

6.

Check brake booster: Refer to 

BR-34, "Inspection and Adjustment"

.

7.

Check front disc brake: Refer to 

BR-46, "BRAKE CALIPER ASSEMBLY (2 PISTON TYPE) : Inspection"

(2 piston type), 

BR-50, "BRAKE CALIPER ASSEMBLY (4 PISTON TYPE) : Inspection"

 (4 piston type).

8.

Check rear disc brake: Refer to 

BR-60, "BRAKE CALIPER ASSEMBLY (1 PISTON TYPE) : Inspection"

 (1

piston type), 

BR-64, "BRAKE CALIPER ASSEMBLY (2 PISTON TYPE) : Inspection"

 (2 piston type).

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

Perform self-diagnosis for “ABS” with CONSULT-III.

Is any item indicated on the self-diagnosis display?

YES

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

NO

>> Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection

with harness connector. If any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1142

PRESS SEN CIRCUIT

Pressure sensor signal line is open or shorted, or pres-
sure sensor is malfunctioning.

• Harness or connector
• Stop lamp switch
• ABS actuator and electric unit 

(control unit)

C1142 PRESS SENSOR

BRC-73

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Special Repair Requirement

INFOID:0000000005528317

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-9, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

BRC-74

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

C1143 STEERING ANGLE SENSOR

C1143 STEERING ANGLE SENSOR

Description

INFOID:0000000005234558

The steering angle sensor detects the rotation amount, angular velocity and direction of the steering wheel,
and transmits the data to the ABS actuator and electric unit (control unit) via CAN communication.

DTC Logic

INFOID:0000000005234559

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 “C1143” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-74, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005234560

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect ABS actuator and electric unit (control unit) harness connector.

3.

Disconnect steering angle 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 STEERING ANGLE SENSOR POWER SUPPLY

1.

Check the voltage between steering angle sensor harness connector and ground.

2.

Turn ignition switch ON.

CAUTION:

Never start the engine.

3.

Check the 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

DTC

Display item

Malfunction detected condition

Possible cause

C1143

ST ANG SEN CIRCUIT

Steering angle sensor is malfunctioning.

• Harness or connector
• Steering angle sensor
• ABS actuator and electric unit 

(control unit)

Steering angle sensor

—

Condition

Voltage

Connector

Terminal

M37

8

Ground

Ignition switch: OFF

Approx. 0V

Steering angle sensor

—

Condition

Voltage

Connector

Terminal

M37

8

Ground

Ignition switch: ON

Battery voltage