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Infiniti QX56 (JA60). Manual - part 149

NORMAL OPERATING CONDITION

BRC-109

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

BRC

NORMAL OPERATING CONDITION

Description

INFOID:0000000005148092

Symptom

Result

Slight vibrations are felt on the brake pedal and the operation noises occur, when VDC, TCS or ABS is acti-
vated.

This is a normal condi-
tion due to the VDC,
TCS or ABS activation.

Stopping distance is longer than that of vehicles without ABS when the vehicle drives on rough, gravel, or
snow-covered (fresh, deep snow) roads.

The brake pedal moves and generates noises, when TCS or VDC is activated due to rapid acceleration or
sharp turn.

The brake pedal vibrates and motor operation noises occur from the engine room, after the engine starts and
just after the vehicle starts.

This is normal, and it is
caused by the ABS op-
eration check.

Depending on the road conditions, the driver may experience a sluggish feel.

This is normal, because
TCS places the highest
priority on the optimum
traction (stability).

TCS may activate momentarily if wheel speed changes when driving over location where friction coefficient
varies, when downshifting, or when fully depressing accelerator pedal.

The ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp may turn ON when the vehicle is
subject to strong shaking or large vibration, such as when the vehicle is rotating on a turntable or located on
a ship while the engine is running.

In this case, restart the
engine on a normal
road. If the normal con-
dition is restored, there
is no malfunction. At
that time, erase the self-
diagnosis memory.

VDC may not operate normally or the ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator lamp
may illuminate, when running on a special road that is extremely slanted (e.g. bank in a circuit course).

A malfunction may occur in the yaw rate/side/decel G sensor system, when the vehicle turns sharply, such
as during a spin turn, axle turn, or drift driving, while the VDC function is off (VDC OFF indicator lamp illumi-
nated).

The vehicle speed will not increase even though the accelerator pedal is depressed, when inspecting the
speedometer on a 2-wheel chassis dynamometer.

Normal (Deactivate the
VDC/TCS function be-
fore performing an in-
spection on a chassis
dynamometer.)

VDC OFF indicator lamp and SLIP indicator lamp may simultaneously turn on when low tire pressure warn-
ing lamp turns on.

This is not a VDC sys-
tem error but results
from characteristic
change of tire.

BRC-110

< PRECAUTION >

[VDC/TCS/ABS]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000005403136

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SR and SB section of this Service Man-

ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000005403137

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″LOCK″ position.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the

″ACC″ position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.

PRECAUTIONS

BRC-111

< PRECAUTION >

[VDC/TCS/ABS]

BRC

5. When the repair work is completed, return the ignition switch to the

″LOCK″ position before connecting

the battery cables. (At this time, the steering lock mechanism will engage.)

6. Perform a self-diagnosis check of all control units using CONSULT-III.

Precaution for Brake System

INFOID:0000000005148094

CAUTION:

• Always use recommended brake fluid. Refer to

MA-13, "Fluids and Lubricants"

• Never reuse drained brake fluid.

• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is

splashed on painted areas, wash it away with water immediately.

• To clean or wash all parts of master cylinder and disc brake caliper, use clean brake fluid.

• Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic sys-

tem.

• Use flare nut wrench when removing and installing brake

tube.

• If a brake fluid leak is found, the part must be disassembled

without fail. Then it has to be replaced with a new one if a

defect exists.

• Turn the ignition switch OFF and remove the connector of the

ABS actuator and electric unit (control unit) or the battery ter-

minal before performing the work.

• Always torque brake lines when installing.

• Burnish the brake contact surfaces after refinishing or replac-

ing rotors, after replacing pads, or if a soft pedal occurs at

very low mileage.

Refer to

BR-30, "Brake Burnishing Procedure"

(front disc brake) or

BR-35, "Brake Burnishing Proce-

dure"

(rear disc brake).

WARNING:

• Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.

Precaution for Brake Control

INFOID:0000000005148095

• During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is

normal.

• Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from engine

compartment. This is a normal status of operation check.

• Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or

snow-covered (fresh, deep snow) roads.

• When an error is indicated by ABS or another warning lamp, collect all necessary information from customer

(what symptoms are present under what conditions) and check for simple causes before starting diagnosis.

Besides electrical system inspection, check booster operation, brake fluid level, and fluid leaks.

• If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts, stop-

ping distance or steering stability may deteriorate.

• If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or

error.

• If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness

pinches, open circuits or improper wiring.

• If the following components are replaced with non-genuine components or modified, the VDC OFF indicator

lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components

related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified

size), components related to brake system (pads, rotors, calipers, etc.), components related to engine (muf-

fler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).

• Driving with broken or excessively worn suspension components, tires or brake system components may

cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not

operate properly.

• When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The

noise is a result of the normal operation of the TCS and VDC.

• When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as

sharp curves on a freeway), the VDC may not operate normally, or the VDC warning lamp and the SLIP indi-

cator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the engine.

SBR686C

BRC-112

< PRECAUTION >

[VDC/TCS/ABS]

PRECAUTIONS

• Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw

rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed

after restarting the engine.

Precaution for CAN System

INFOID:0000000005148096

• Do not apply voltage of 7.0V or higher to terminal to be measured.

• Maximum open terminal voltage of tester in use must be less than 7.0V.

• Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.

• Area to be repaired must be soldered and wrapped with tape.

Make sure that fraying of twisted wire is within 110 mm (4.33 in).

• Do not make a bypass connection to repaired area. (If the circuit is

bypassed, characteristics of twisted wire will be lost.)

PKIA0306E

PKIA0307E

Content .. 147 148 149 150 ..