Infiniti QX56 (JA60). Manual - part 140

C1178, C1181, C1184, C1189 ABS ACTIVE BOOSTER

BRC-73

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

1. Measure the continuity between ABS actuator and electric unit

(control unit) connector E125 (A) and active booster connector

E49 (B).

2. Measure the continuity between ABS actuator and electric unit (control unit) connector E125 (A) and body

ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness or connector.

3.

ACTIVE BOOSTER INSPECTION

1. Reconnect the active booster and ABS actuator and electric unit (control unit) connectors.

2. Perform the active booster component inspection. Refer to 

BRC-73, "Component Inspection"

.

Is the inspection result normal?

YES

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

BRC-116, "Removal and Instal-

lation"

.

NO

>> Replace the active booster. Refer to 

BR-26, "Removal and Installation"

.

Component Inspection

INFOID:0000000005148050

1.

CHECK DATA MONITOR

Use “DATA MONITOR” to check if the status of “RELEASE SWITCH NO” and “RELEASE SWITCH NC” is nor-

mal.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-72, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000005194921

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

ABS actuator and electric unit 

(control unit)

Active booster

Continuity

Connector

Terminal

Connector

Terminal

E125 (A)

17

E49 (B)

3

Yes

27

1

28

5

30

2

31

4

ABS actuator and electric unit (control 

unit)

—

Continuity

Connector

Terminal

E125 (A)

17

Ground

No

27

28

30

31

AWFIA0028ZZ

Condition

RELEASE SWITCH NO

(DATA MONITOR)

RELEASE SWITCH NC

(DATA MONITOR)

When brake pedal is applied.

ON

OFF

When brake pedal is released.

OFF

ON

BRC-74

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1178, C1181, C1184, C1189 ABS ACTIVE BOOSTER

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

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

C1179 ABS DELTA S SEN NG

BRC-75

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1179 ABS DELTA S SEN NG

Description

INFOID:0000000005148052

The active brake booster consists of a vacuum booster, an active booster control group and a delta stroke

sensor. If a brake booster system malfunction occurs due to loss of vacuum, the delta stroke sensor will signal

the ABS actuator and electric unit (control unit) that a booster malfunction has occurred. The active booster

then applies supplemental force to the master cylinder relative to the amount of force exerted on the brake

pedal.

DTC Logic

INFOID:0000000005148053

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-75, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005148054

Regarding Wiring Diagram information, refer to 

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

.

1.

CONNECTOR INSPECTION

1. Turn the ignition switch OFF.

2. Disconnect the delta stroke sensor connector and ABS actuator and electric unit (control unit) connector

and inspect the terminals for deformation, disconnection, looseness, or damage.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair connector.

2.

DELTA STROKE SENSOR CIRCUIT INSPECTION

1. Measure the continuity between ABS actuator and electric unit

(control unit) connector E125 (A) and delta stroke sensor con-

nector E114 (B).

DTC

Display item

Malfunction detected condition

Possible cause

C1179

ABS DELTA S SEN NG

Delta stroke sensor is malfunctioning, or signal line of 
delta stroke sensor is open or shorted.

• Harness or connector
• Delta stroke sensor
• ABS actuator and electric unit 

(control unit)

Self-diagnosis results

ABS DELTA S SEN NG

ABS actuator and electric unit 

(control unit)

Delta stroke sensor

Continuity

Connector

Terminal

Connector

Terminal

E125 (A)

26

E114 (B)

1

Yes

39

3

40

5

AWFIA0029ZZ

BRC-76

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1179 ABS DELTA S SEN NG

2. Measure the continuity between ABS actuator and electric unit (control unit) connector E125 (A) and body

ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness or connector.

3.

DELTA STROKE SENSOR INSPECTION

1. Connect the delta stroke sensor and ABS actuator and electric unit (control unit) connectors.

2. Perform the delta stroke sensor component inspection. Refer to 

BRC-76, "Component Inspection"

.

Is the inspection result normal?

YES

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

BRC-116, "Removal and Instal-

lation"

.

NO

>> Replace the delta stroke sensor.

Component Inspection

INFOID:0000000005148055

1.

CHECK DATA MONITOR

Use “DATA MONITOR” to check if the status of “DELTA S SEN” is normal.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-75, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000005194922

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

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

ABS actuator and electric unit (control 

unit)

—

Continuity

Connector

Terminal

E125 (A)

26

Ground

No

39

40

Condition

DELTA S SEN

(DATA MONITOR)

When brake pedal is applied.

1.05–1.80 mm

When brake pedal is released.

0.00 mm (+0.6/-0.4)