Nissan Leaf. Manual - part 328

BRC-102

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1120, C1122, C1124, C1126 ABS IN VALVE SYSTEM

Is DTC “C1120”, “C1122”, “C1124” or “C1126” detected?

YES

>> GO TO 3.

NO

>> Inspection End.

3.

CHECK ABS IN VALVE 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 ABS IN VALVE 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 ABS IN VALVE 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

C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM

BRC-103

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM

DTC Logic

INFOID:0000000010120073

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 “C1121”, “C1123”, “C1125” or “C1127” detected?

YES

>> Proceed to 

BRC-103, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010120074

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.
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 DIAGNOSIS

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”.

DTC

Display Item

Malfunction detected condition

Possible causes

C1121

FR LH OUT ABS SOL

When a malfunction is detected in front LH ABS OUT 
valve.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• Fusible link
• 12V battery power supply sys-

tem

C1123

FR RH OUT ABS SOL

When a malfunction is detected in front RH ABS OUT 
valve.

C1125

RR LH OUT ABS SOL

When a malfunction is detected in rear LH ABS OUT 
valve.

C1127

RR RH OUT ABS SOL

When a malfunction is detected in rear RH ABS OUT 
valve.

BRC-104

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM

Is DTC “C1121”, “C1123”, “C1125” or “C1127” detected?

YES

>> GO TO 3.

NO

>> Inspection End.

3.

CHECK ABS OUT VALVE 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 ABS OUT VALVE 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 ABS OUT VALVE 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

C1140 ACTUATOR RELAY SYSTEM

BRC-105

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1140 ACTUATOR RELAY SYSTEM

DTC Logic

INFOID:0000000010120075

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 “C1140” detected?

YES

>> Proceed to 

BRC-105, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010120076

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.
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 DIAGNOSIS

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 “C1140” detected?

YES

>> GO TO 3.

NO

>> Inspection End.

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
• 12V battery power supply sys-

tem