Nissan Leaf. Manual - part 330

BRC-110

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1143 STEERING ANGLE SENSOR

C1143 STEERING ANGLE SENSOR

DTC Logic

INFOID:0000000010120079

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 “C1143” detected?

YES

>> Proceed to 

BRC-110, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010120080

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 steering angle 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

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

C1143

ST ANG SEN CIRCUIT

When a malfunction is detected in steering angle sen-
sor.

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

(control unit)

• Fuse
• Power switch ON power supply 

system

• CAN communication line

C1143 STEERING ANGLE SENSOR

BRC-111

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Is DTC “C1143” detected?

YES

>> GO TO 3.

NO

>> Inspection End.

3.

CHECK STEERING ANGLE SENSOR POWER SUPPLY

1. Turn the power switch OFF.

2. Disconnect steering angle sensor harness connector.

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

4. Turn the power switch ON.

CAUTION:

Never set the vehicle to READY.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT

1. Turn the power switch OFF.

2. Check the 10A fuse (#4).

3. Check the continuity and short circuit between steering angle sensor harness connector terminal (4) and

10A fuse (#4).

Is the inspection result normal?

YES

>> Perform trouble diagnosis for power switch ON power supply. Refer to 

PG-15, "Wiring Diagram —

Battery Power Supply —"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK STEERING ANGLE SENSOR GROUND CIRCUIT

1. Turn the power switch OFF.

2. Check the continuity between steering angle sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK TERMINAL

Check the steering angle sensor pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK CAN COMMUNICATION LINE

Check the “STRG BRANCH LINE CIRCUIT”. Refer to 

LAN-67, "Diagnosis Procedure"

.

Is the inspection result normal?

Steering angle sensor

—

Voltage

(Approx.)

Connector

Terminal

M30

4

Ground

0 V

Steering angle sensor

—

Voltage

(Approx.)

Connector

Terminal

M30

4

Ground

Battery voltage

Steering angle sensor

—

Continuity

Connector

Terminal

M30

1

Ground

Yes

BRC-112

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1143 STEERING ANGLE SENSOR

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts. Refer to 

LAN-27, "Precautions for Harness Repair"

.

8.

CHECK DATA MONITOR

With CONSULT

1. “ABS”, “Data Monitor” and “STR ANGLE SIG” according to this order.

2. Check that the indication changes with the steering angle when the steering wheel is turned left/right from

the neutral position. Refer to 

BRC-51, "Reference Value"

.

Is the inspection result normal?

YES

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

BRC-162, "Removal and Installa-

tion"

.

NO

>> Replace steering angle sensor. Refer to 

BRC-165, "Removal and Installation"

.

C1144 INCOMPLETE STEERING ANGLE SENSOR ADJUSTMENT

BRC-113

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1144 INCOMPLETE STEERING ANGLE SENSOR ADJUSTMENT

DTC Logic

INFOID:0000000010120081

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 “C1144” detected?

YES

>> Proceed to 

BRC-113, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010120082

1.

ADJUST THE NEUTRAL POSITION OF STEERING ANGLE SENSOR

Perform neutral position adjustment of steering angle sensor. Refer to 

BRC-70, "Work Procedure"

.

>> GO TO 2.

2.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

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 “C1144” detected?

YES

>> GO TO 3.

NO

>> Inspection End.

3.

CHECK STEERING ANGLE SENSOR SYSTEM

1. Turn the power switch OFF.

DTC

Display Item

Malfunction detected condition

Possible causes

C1144

ST ANG SEN SIGNAL

When neutral position adjustment of steering angle 
sensor is not complete.

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

(control unit)

• Incomplete neutral position ad-

justment of steering angle sen-
sor