Nissan Leaf. Manual - part 329

BRC-106

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1140 ACTUATOR RELAY SYSTEM

3.

CHECK ACTUATOR RELAY POWER SUPPLY

1. Turn the power switch OFF.

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

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

4. Turn the power switch ON.

CAUTION:

Never set the vehicle to READY.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK ACTUATOR RELAY POWER SUPPLY CIRCUIT

1. Turn the power switch OFF.

2. Check the 50A fusible link (#J).

3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness con-

nector terminal (2) and 50A fusible link (#J).

Is the inspection result normal?

YES

>> Perform trouble diagnosis for 12V battery power supply. Refer to 

PG-15, "Wiring Diagram — Bat-

tery Power Supply —"

 .

NO

>> Repair or replace error-detected parts.

5.

CHECK ACTUATOR RELAY GROUND CIRCUIT

1. Turn the power switch OFF.

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

ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK TERMINAL

Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-

ness connector.
Is the inspection result normal?

YES

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

BRC-162, "Removal and Installa-

tion"

.

NO

>> Repair or replace error-detected parts.

ABS actuator and electric unit (control unit)

—

Voltage

(Approx.)

Connector

Terminal

E35

2

Ground

Battery voltage

ABS actuator and electric unit (control unit)

—

Voltage

(Approx.)

Connector

Terminal

E35

2

Ground

Battery voltage

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E35

3

Ground

Yes

4

C1142 PRESS SENSOR

BRC-107

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1142 PRESS SENSOR

DTC Logic

INFOID:0000000010120077

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1. Turn the power switch OFF 

→ ON.

CAUTION:

• Be sure to wait of 10 seconds after turning power switch OFF or ON.

• Set the vehicle to READY.

2. Repeat step 1 two or more times.

3. Perform “Self Diagnostic Result” of “ABS”.
Is DTC “C1142” detected?

YES

>> Proceed to 

BRC-107, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000010120078

Regarding Wiring Diagram information. Refer to 

BRC-58, "Wiring Diagram"

.

1.

CHECK CONNECTOR

1. Turn the power switch OFF

2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.

3. Check the master cylinder pressure sensor harness connector for disconnection or looseness.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts, securely lock the connector, and GO TO 2.

2.

PERFORM SELF DIAGNOSTIC (1)

With CONSULT

1. Turn the power switch OFF 

→ ON.

CAUTION:

• Be sure to wait of 10 seconds after turning power switch OFF or ON.

• Set the vehicle to READY.

2. Repeat step 1 two or more times.

3. Perform “Self Diagnostic Result” of “ABS”.
Is DTC“C1142” detected?

DTC

Display Item

Malfunction detected condition

Possible causes

C1142

PRESS SEN CIRCUIT

When a malfunction is detected in master cylinder pressure 
sensor.

• Stop lamp switch system
• ABS actuator and electric unit 

(control unit)

• Brake system
• Master cylinder pressure sen-

sor

BRC-108

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1142 PRESS SENSOR

YES

>> GO TO 3.

NO

>> Inspection End.

3.

CHECK MASTER CYLINDER PRESSURE SENSOR CIRCUIT

1. Turn the power switch OFF

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

3. Disconnect master cylinder pressure sensor harness connector.

4. Check the continuity between master cylinder pressure sensor harness connector and ABS actuator and

electric unit (control unit) harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK MASTER CYLINDER PRESSURE SENSOR POWER SUPPLY

1. Connect ABS actuator and electric unit (control unit) harness connector.

2. Turn the power switch ON.

CAUTION:

Never set the vehicle to READY.

3. Check the voltage master cylinder pressure sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

BRC-162, "Removal and Installa-

tion"

.

5.

CHECK DATA MONITOR

With CONSULT

1. Turn the power switch OFF.

2. Connect master cylinder pressure sensor harness connector.

3. “ABS”, “Data Monitor” and “PRESS SENSOR” according to this order.

4. Check that the indication changes with the depth of pedal depression. Refer to 

BRC-51, "Reference

Value"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 7.

6.

PERFORM SELF DIAGNOSTIC (2)

With CONSULT

1. Turn the power switch OFF 

→ ON.

ABS actuator and electric unit (control unit)

Master cylinder pressure sensor

Continuity

Connector

Terminal

Connector

Terminal

E35

10

E31

1

No

10

2

No

10

3

Yes

7

1

No

7

2

Yes

7

3

No

32

1

Yes

32

2

No

32

3

No

Master cylinder pressure sensor

Voltage

(Approx.)

Connector

Terminal

E31

1 

−  2

5  V

C1142 PRESS SENSOR

BRC-109

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

CAUTION:

• Be sure to wait of 10 seconds after turning power switch OFF or ON.

• Set the vehicle to READY.

2. Repeat step 1 two or more times.

3. Perform “Self Diagnostic Result” of “ABS”.
Is DTC“C1142” detected?

YES

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

BRC-162, "Removal and Installa-

tion"

.

NO

>> Inspection End.

7.

CHECK MASTER CYLINDER PRESSURE SENSOR

1. Turn the power switch OFF.

2. Connect following terminals between master cylinder pressure sensor and harness connector (test har-

ness).

3. Turn the power switch ON.

CAUTION:

Never set the vehicle to READY.

4. Check that the voltage between master cylinder pressure sensor harness connectors changes with the

depth of pedal depression.

CAUTION:

Never short out the terminals while measuring voltages.

Is the inspection result normal?

YES

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

BRC-162, "Removal and Installa-

tion"

.

NO

>> Replace master cylinder pressure sensor. Refer to 

BR-510, "Removal and installation"

.

Master cylinder pressure sensor

Harness connector

Connector

Terminal

1

E31

1

2

2

3

3

Master cylinder pressure sensor

Voltage

(Approx.)

Connector

Terminal

E31

1 – 2

0.5 – 4.5 V