Infiniti QX56 (JA60). Manual - part 136

C1142 PRESS SENSOR

BRC-57

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

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BRC

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C1142 PRESS SENSOR

Description

INFOID:0000000005148018

The front and rear pressure sensors convert the brake fluid pressure to an electric signal and transmit it to the

ABS actuator and electric unit (control unit).

DTC Logic

INFOID:0000000005148019

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-57, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005148020

Regarding Wiring Diagram information, refer to 

BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -"

.

FRONT PRESSURE SENSOR

1.

CONNECTOR INSPECTION

1. Turn the ignition switch OFF.

2. Disconnect the front pressure sensor connector and ABS actuator and electric unit (control unit) connec-

tor and inspect the terminals for deformation, disconnection, looseness, or damage.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair connector.

2.

FRONT PRESSURE SENSOR CIRCUIT INSPECTION

1. Measure the continuity between the ABS actuator and electric

unit (control unit) connector E125 (A) and front pressure sensor

connector E31 (B).

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
• Pressure sensor
• ABS actuator and electric unit 

(control unit)

Self-diagnosis results

PRESS SEN CIRCUIT

ABS actuator and electric unit 

(control unit)

Front pressure sensor

Continuity

Connector

Terminal

Connector

Terminal

A: E125

18

B: E31

3

Yes

19

1

20

2

AWFIA0021ZZ

BRC-58

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1142 PRESS SENSOR

2. Measure the continuity between the ABS actuator and electric unit (control unit) connector E125 (A) and

body ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness or connector.

3.

FRONT PRESSURE SENSOR INSPECTION

1. Connect the front pressure sensor and ABS actuator and electric unit (control unit) connectors.

2. Perform the front pressure sensor component inspection. Refer to 

BRC-59, "Component Inspection"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace the front pressure sensor.

REAR PRESSURE SENSOR

1.

CONNECTOR INSPECTION

1. Turn the ignition switch OFF.

2. Disconnect the rear pressure sensor connector and ABS actuator and electric unit (control unit) connector

and inspect the terminals for deformation, disconnection, looseness, or damage.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair connector.

2.

REAR PRESSURE SENSOR CIRCUIT INSPECTION

1. Measure the continuity between the ABS actuator and electric

unit (control unit) connector E125 (A) and rear pressure sensor

connector E32 (B).

2. Measure the continuity between the ABS actuator and electric unit (control unit) connector E125 (A) and

body ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness or connector.

ABS actuator and electric unit (control 

unit)

—

Continuity

Connector

Terminal

A: E125

18

Ground

No

19

20

ABS actuator and electric unit 

(control unit)

Rear pressure sensor

Continuity

Connector

Terminal

Connector

Terminal

A: E125

21

B: E32

1

Yes

22

3

23

2

ABS actuator and electric unit (control 

unit)

—

Continuity

Connector

Terminal

A: E125

21

Ground

No

22

23

AWFIA0022ZZ

C1142 PRESS SENSOR

BRC-59

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

3.

REAR PRESSURE SENSOR INSPECTION

1. Connect the rear pressure sensor and ABS actuator and electric unit (control unit) connectors.

2. Perform the rear pressure sensor component inspection. Refer to 

BRC-59, "Component Inspection"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace the rear pressure sensor.

Component Inspection

INFOID:0000000005148021

1.

CHECK DATA MONITOR

On “DATA MONITOR”, select “PRESS SENSOR” or “PRESS SEN2” and check the brake fluid pressure.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-57, "Diagnosis Procedure"

.

Condition

PRESS SENSOR or PRESS SEN2

(DATA MONITOR)

With ignition switch turned ON and brake pedal released.

Approx. 0 bar

With ignition switch turned ON and brake pedal depressed.

Positive value

BRC-60

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1143, C1144 STEERING ANGLE SENSOR

C1143, C1144 STEERING ANGLE SENSOR

Description

INFOID:0000000005148023

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:0000000005148024

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-60, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005148025

Regarding Wiring Diagram information, refer to 

BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -"

.

1.

CONNECTOR INSPECTION

1. Turn ignition switch OFF.

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

3. Disconnect steering angle sensor connector.

4. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or

replace terminal.

5. Reconnect connectors and then perform the self-diagnosis. Refer to 

BRC-23, "CONSULT-III Function

(ABS)"

.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 2

NO

>> Poor connection of connector terminal. Repair or replace connector.

2.

CHECK STEERING ANGLE SENSOR HARNESS

1. Turn ignition switch OFF.

2. Disconnect steering angle sensor connector.

DTC

Display item

Malfunction detected condition

Possible cause

C1143

ST ANG SEN CIRCUIT

Neutral position of steering angle sensor is dislocated, or 
the steering angle sensor is malfunctioning.

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

(control unit)

C1144

ST ANG SEN SIGNAL

Neutral position of steering angle sensor is not finished.

Self-diagnosis results

ST ANG SEN CIRCUIT

ST ANG SEN SIGNAL