Infiniti QX56 (Z62). Manual - part 161

THE BRAKING DISTANCE IS LONG

BRC-129

< SYMPTOM DIAGNOSIS >

[WITH VDC]

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THE BRAKING DISTANCE IS LONG

Description

INFOID:0000000006222661

Brake stopping distance is long when ABS function is operated.

Diagnosis Procedure

INFOID:0000000006222662

CAUTION:

Brake stopping distance on slippery road like rough road, gravel road or snowy road may become
longer when ABS is operated than when ABS is not operated.

1.

CHECK BRAKING FORCE

Check brake force using a brake tester.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check each components of brake system.

2.

CHECK BRAKE PERFORMANCE

Disconnect ABS actuator and electric unit (control unit) connector so that ABS does not operate. Check brake
stopping distance in this condition. Connect harness connectors after checking.

Is the inspection result normal?

YES

>> Normal

NO

>> Check each components of brake system.

BRC-130

< SYMPTOM DIAGNOSIS >

[WITH VDC]

DOES NOT OPERATE

DOES NOT OPERATE

Description

INFOID:0000000006222663

VDC function, TCS function, ABS function, EBD function, hill start assist function and brake limited slip differ-
ential (BLSD) function does not operate.

Diagnosis Procedure

INFOID:0000000006222664

CAUTION:

• VDC function, ABS function and EBD function never operate when the vehicle speed is 10 km/h (6.2

MPH) or less.

• TCS function, hill start assist function and brake limited slip differential (BLSD) function operates

when the vehicle speed is 0 km/h (0 MPH) (the vehicle is in stop status).

• VDC function and TCS function never operate when VDC OFF switch is operated (when VDC OFF

indicator lamp turns ON).

1.

CHECK ABS WARNING LAMP

Check that ABS warning lamp, brake warning lamp and VDC warning lamp turn ON and turn OFF approx. 1
second after key switch is turned ON. Check that ABS warning lamp, brake warning lamp and VDC warning
lamp and stay in OFF status during driving.

CAUTION:

Brake warning lamp turns ON when parking brake is operated (parking brake switch is ON) or brake
fluid is less than the specified level (brake fluid level switch is ON).

Is the inspection result normal?

YES

>> Normal

NO

>> Perform self-diagnosis for “ABS” with CONSULT-III.

BRAKE PEDAL VIBRATION OR OPERATION SOUND OCCURS

BRC-131

< SYMPTOM DIAGNOSIS >

[WITH VDC]

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BRAKE PEDAL VIBRATION OR OPERATION SOUND OCCURS

Description

INFOID:0000000006222665

• Brake pedal vibrates and motor sound from ABS actuator and electric unit (control unit) occurs, when the

engine starts.

• Brake pedal vibrates during braking.

CAUTION:

Vibration may be felt during brake pedal is lightly depressed (just placing a foot on it) in the following
conditions. This is normal.
• When shifting gears
• When driving on slippery road
• During cornering at high speed
• When passing over bumps or grooves [Approx. 50 mm (1.97 in) or more]
• When pulling away just after starting engine [at approx. 10 km/h (6.2 MPH) or higher]

Diagnosis Procedure

INFOID:0000000006222666

1.

CHECK SYMPTON 1

Depress the brake pedal 10 times or more with the engine stopped and decrease the accumulator pressure to
check that there are pedal vibrations when the engine is started.

Do vibrations occur?

YES

>> GO TO 2.

NO

>> Check brake pedal. Refer to 

BR-21, "Inspection and Adjustment"

.

2.

CHECK SYMPTON 2

Depress the brake pedal 10 times or more with the engine stopped and decrease the accumulator pressure to
check that motor noise from ABS actuator and electric unit (control unit) occurs when the engine starts.

Does the operation sound occur?

YES

>> GO TO 3.

NO

>> Perform self-diagnosis for “ABS” with CONSULT-III.

3.

CHECK SYMPTON 3

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

YES

>> Check that radio (including wiring), antenna and antenna lead-in wires are not located near ABS

actuator and electric unit (control unit). Move them if they are located near ABS actuator and elec-
tric unit (control unit).

NO

>> Normal

BRC-132

< SYMPTOM DIAGNOSIS >

[WITH VDC]

VEHICLE JERKS DURING

VEHICLE JERKS DURING

Description

INFOID:0000000006222667

The vehicle jerks when VDC function, TCS function, ABS function, EBD function, hill start assist function and
brake limited slip differential (BLSD) function operates.

Diagnosis Procedure

INFOID:0000000006222668

1.

CHECK SYMPTOM

Check that the vehicle jerks when VDC function, TCS function, ABS function, EBD function, hill start assist
function and brake limited slip differential (BLSD) function operates.

Is the inspection result normal?

YES

>> Normal

NO

>> GO TO 2.

2.

PERFORM THE SELF-DIAGNOSIS

With CONSULT-III.

Perform self-diagnosis for “ABS”.
Is any DTC detected?

YES

>> Check the DTC. Refer to 

BRC-51, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK CONNECTOR

With CONSULT-III.

1.

Turn the ignition switch OFF.

2.

Disconnect ABS actuator and electric unit (control unit) harness connector.

3.

Check connector terminal for deformation, disconnection and looseness.

4.

Connect harness connector and perform self-diagnosis for “ABS” again.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Poor connection of connector terminal. Repair or replace connector terminal.

4.

CHECK ECM AND TCM SELF-DIAGNOSIS RESULTS

With CONSULT-III.

Perform self-diagnosis for “ENGINE” and “TRANSMISSION”.

Is any DTC detected?

YES

>> Check the DTC.

NO

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

BRC-137, "Removal and Installa-

tion"

.