Infiniti QX56 (Z62). Manual - part 152

C1140 ACTUATOR RELAY SYSTEM

BRC-93

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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BRC

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C1140 ACTUATOR RELAY SYSTEM

DTC Logic

INFOID:0000000006222615

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 “C1140” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-93, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222616

1.

CHECK ACTUATOR RELAY POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

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

3.

Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start engine.

5.

Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK ACTUATOR RELAY POWER SUPPLY CIRCUIT

1.

Turn the ignition switch OFF.

2.

Check 30A fusible link (L).

3.

Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).

Is the inspection result normal?

YES

>> Perform trouble diagnosis for battery power supply. Refer to 

PG-11, "Wiring Diagram - BATTERY

POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK ACTUATOR RELAY GROUND CIRCUIT

DTC

Display Item

Malfunction detected condition

Possible causes

C1140

ACTUATOR RLY

When a malfunction is detected in actuator relay.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• Fusible  link
• Battery power supply system

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

1

Ground

Battery voltage

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

1

Ground

Battery voltage

BRC-94

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1140 ACTUATOR RELAY SYSTEM

1.

Turn the ignition switch OFF.

2.

Check continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK TERMINAL

Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
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.

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E36

2

Ground

Existed

3

E37

48

C1142 PRESS SENSOR

BRC-95

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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C1142 PRESS SENSOR

DTC Logic

INFOID:0000000006222617

DTC DETECTION LOGIC

*: Models with Advanced Driver Assistance System

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 “C1142” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-95, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222618

1.

CHECK STOP LAMP SWITCH SUSTEM

Check stop lamp switch system. Refer to 

BRC-79, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK BRAKE FLUID LEACKAGE

Check brake fluid leakage. Refer to 

BR-10, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK BRAKE PIPING

Check brake piping. Refer to 

BR-24, "FRONT : Inspection"

 (front), 

BR-26, "REAR : Inspection"

 (rear).

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK BRAKE PEDAL

Check brake pedal. Refer to 

BR-21, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK HYDRAULIC BOOSTER ASSEMBLY

Check hydraulic booster assembly. Refer to 

BR-32, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK FRONT DISC BRAKE

Check front disc brake. Refer to 

BR-39, "BRAKE CALIPER ASSEMBLY : Inspection"

.

DTC

Display Item

Malfunction detected condition

Possible causes

C1142

PRESS SEN CIRCUIT

When a malfunction is detected in master cylinder 

pressure sensor or control pressure sensor

*

.

• Stop lamp switch system
• ABS actuator and electric unit 

(control unit)

• Brake system

BRC-96

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1142 PRESS SENSOR

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK REAR DISC BRAKE

Check rear disc brake. Refer to 

BR-45, "BRAKE CALIPER ASSEMBLY : Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts.

8.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

With CONSULT-III.

1.

Erase Self-diagnosis result for “ABS”.

2.

Start the engine and drive the vehicle for a short period of time.

3.

Perform self-diagnosis for “ABS”.

Is DTC “C1142” detected?

YES

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

BRC-137, "Removal and Installa-

tion"

NO

>> Check ABS actuator and electric unit (control unit) harness connector and terminal for damage,

looseness and disconnection. Repair or replace error-detected parts.