Infiniti QX56 (JA60). Manual - part 137

C1143, C1144 STEERING ANGLE SENSOR

BRC-61

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

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A

B

BRC

N

O

P

3. Check continuity between steering angle sensor connector M17

terminal 2 and ground.

4. Turn ignition switch ON.

5. Check voltage between steering angle sensor connector M17

terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace malfunctioning components.

3.

CHECK DATA MONITOR

1. Connect the steering angle sensor connector and ABS actuator and electric unit (control unit) connector.

2. Perform the steering angle sensor component inspection. Refer to 

BRC-61, "Component Inspection"

.

Is the inspection result normal?

YES

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

BRC-116, "Removal and Installa-

tion"

.

NO

>> Replace steering angle sensor and adjust neutral position of steering angle sensor. Refer to 

BRC-

118, "Removal and Installation"

.

Component Inspection

INFOID:0000000005148026

1.

CHECK DATA MONITOR

Select “STR ANGLE SIG” in “DATA MONITOR” and check steering angle sensor signal.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-60, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000005194918

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator

and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL

POSITION : Description"

.

>> GO TO 2

Steering angle sensor

—

Continuity

Connector

Terminal

M17

2

Ground

Yes

WFIA0399E

Steering angle sensor

—

Voltage

Connector

Terminal

M17

3

Ground

Battery voltage

AWFIA0023ZZ

Steering condition

STR ANGLE SIG (DATA MONITOR)

Driving straight

±2.5 °

Turn 90 

° to right

Approx. +90 

°

Turn 90 

° to left

Approx. 

−90 °

BRC-62

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1143, C1144 STEERING ANGLE SENSOR

2.

CALIBRATION OF DECEL G SENSOR

Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).

Refer to 

BRC-9, "CALIBRATION OF DECEL G SENSOR : Description"

.

>> END

C1155 BRAKE FLUID LEVEL SWITCH

BRC-63

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

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K

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A

B

BRC

N

O

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C1155 BRAKE FLUID LEVEL SWITCH

Description

INFOID:0000000005148028

The brake fluid level switch converts the brake fluid level to an electric signal and transmits it to the ABS actu-

ator and electric unit (control unit). 

DTC Logic

INFOID:0000000005148029

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-63, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005148030

Regarding Wiring Diagram information, refer to 

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

.

1.

CONNECTOR INSPECTION

1. Disconnect ABS actuator and electric unit (control unit) connector and brake fluid level switch connector. 

2. Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace as necessary.

2.

CHECK HARNESS BETWEEN BRAKE FLUID LEVEL SWITCH AND ABS ACTUATOR AND ELECTRIC

UNIT (CONTROL UNIT)

1. Check continuity between ABS actuator and electric unit (control

unit) harness connector E125 (A) terminal 8 and brake fluid level

switch harness connector E21 (B) terminal 1.

2. Check continuity between ABS actuator and electric unit (control

unit) connector E125 (A) terminal 8 and ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1155

BR FLUID LEVEL LOW

Brake fluid level is low or communication line between 
the ABS actuator and electric unit (control unit) and brake 
fluid level switch is open or shorted.

• Harness or connector
• Brake fluid level switch
• Brake fluid level

Self-diagnosis results

BR FLUID LEVEL LOW

ABS actuator and electric unit 

(control unit)

Brake fluid level switch

Continuity

Connector

Terminal

Connector

Terminal

E125 (A)

8

E21 (B)

1

Yes

AWFIA0025ZZ

BRC-64

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1155 BRAKE FLUID LEVEL SWITCH

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace malfunctioning components.

3.

CHECK BRAKE FLUID LEVEL SWITCH GROUND

Check continuity between brake fluid level switch connector E21 ter-

minal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair or replace malfunctioning components.

4.

CHECK BRAKE FLUID LEVEL SWITCH

Perform the brake fluid level switch component inspection. Refer to 

BRC-64, "Component Inspection"

.

Is the inspection result normal?

YES

>> Perform self-diagnosis again. If the same results appear, replace ABS actuator and electric unit

(control unit). Refer to 

BRC-116, "Removal and Installation"

.

NO

>> Replace brake fluid level switch.

Component Inspection

INFOID:0000000005148031

1.

CHECK BRAKE FLUID LEVEL SWITCH

1. Turn ignition switch OFF.

2. Disconnect brake fluid level switch connector.

3. Check continuity between brake fluid level switch terminals.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Replace brake fluid level switch.

Special Repair Requirement

INFOID:0000000005194919

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator

and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL

POSITION : Description"

.

>> GO TO 2

2.

CALIBRATION OF DECEL G SENSOR

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E125 (A)

8

Ground

No

Brake fluid level switch

—

Continuity

Connector

Terminal

E21

2

Ground

Yes

AWFIA0026ZZ

Brake fluid level switch

Condition

Continuity

Terminal

1 

− 2

When brake fluid is full in the reser-
voir tank.

No

When brake fluid is empty in the 
reservoir tank.

Yes

ALFIA0026ZZ