Infiniti QX56 (JA60). Manual - part 148

THE BRAKING DISTANCE IS LONG

BRC-105

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

THE BRAKING DISTANCE IS LONG

Diagnosis Procedure

INFOID:0000000005148088

CAUTION:

The stopping distance on slippery road surfaces might be longer with the ABS operating than when

the ABS is not operating.

1.

CHECK FUNCTION

Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector to deactivate

ABS. In this condition, check stopping distance. After inspection, connect connector.
Is the inspection result normal?

YES

>> Normal

NO

>> Check brake system.

BRC-106

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

ABS FUNCTION DOES NOT OPERATE

ABS FUNCTION DOES NOT OPERATE

Diagnosis Procedure

INFOID:0000000005148089

CAUTION:

ABS does not operate when speed is 10 km/h (6 MPH) or lower.

1.

CHECK ABS WARNING LAMP DISPLAY

Make sure that the ABS warning lamp turns OFF after ignition switch is turned ON or when driving.
Is the inspection result normal?

YES

>> Normal

NO

>> Perform self-diagnosis. Refer to 

BRC-23, "CONSULT-III Function (ABS)"

. 

PEDAL VIBRATION OR ABS OPERATION SOUND OCCURS

BRC-107

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

PEDAL VIBRATION OR ABS OPERATION SOUND OCCURS

Diagnosis Procedure

INFOID:0000000005148090

CAUTION:

Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly

depressed. However, this is normal.

• When shifting gears

• When driving on slippery road

• During cornering at high speed

• When passing over bumps or grooves [at approximately 50 mm (1.97 in) or more]

• When pulling away just after starting engine [at approximately 10 km/h (6 MPH) or higher]

1.

SYMPTOM CHECK 1

Check that there are pedal vibrations when the engine is started.
Do vibrations occur?

YES

>> GO TO 2

NO

>> Inspect the brake pedal.

2.

SYMPTOM CHECK 2

Check that there are ABS operation noises when the engine is started.
Do the operation noises occur?

YES

>> GO TO 3

NO

>> Perform self -diagnosis. Refer to 

BRC-23, "CONSULT-III Function (ABS)"

.

3.

SYMPTOM CHECK 3

Check symptoms when electrical component (headlamps, etc.) switches are operated.
Do symptoms occur?

YES

>> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit. If there is,

move it farther away.

NO

>> Normal

BRC-108

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

VEHICLE JERKS DURING VDC/TCS/ABS CONTROL

VEHICLE JERKS DURING VDC/TCS/ABS CONTROL

Diagnosis Procedure

INFOID:0000000005148091

1.

SYMPTOM CHECK

Check if the vehicle jerks during VDC/TCS/ABS control.
Is the inspection result normal?

YES

>> Normal.

NO

>> GO TO 2

2.

CHECK SELF-DIAGNOSIS RESULTS

Perform self-diagnosis of ABS actuator and electric unit (control unit). Refer to 

BRC-23, "CONSULT-III Func-

tion (ABS)"

.

Are self-diagnosis results indicated?

YES

>> Check corresponding items, make repairs, and perform ABS actuator and electric unit (control

unit) self-diagnosis. Refer to 

BRC-23, "CONSULT-III Function (ABS)"

.

NO

>> GO TO 3

3.

CHECK CONNECTOR

• Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector and check

terminal for deformation, disconnection, looseness, etc.

• Securely connect connectors and perform ABS actuator and electric unit (control unit) self-diagnosis. Refer

to 

BRC-23, "CONSULT-III Function (ABS)"

.

Are self-diagnosis results indicated?

YES

>> If poor contact, damage, open or short circuit of connector terminal is found, repair or replace.

NO

>> GO TO 4

4.

CHECK ECM AND TCM SELF-DIAGNOSIS RESULTS

Perform ECM and TCM self-diagnosis.
Are self-diagnosis results indicated?

YES

>> Check the corresponding items.

• ECM: Refer to 

EC-63, "CONSULT-III Function (ENGINE)"

.

• TCM: Refer to 

TM-32, "CONSULT-III Function (TRANSMISSION)"

.

NO

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

BRC-116, "Removal and Installa-

tion"

.