Actron CP9449 ABS BrakeScan Manuel d'utilisateur télécharger pdf (Page 14)

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Getting Started

both rear wheels. Under this system, if the left front, right front, or both rear

wheels rotate at a speed different from each other, the ABS computer could

use up to three separate solenoids to control brake fluid hydraulic pressure.

This allowed the ABS system to control the left front, right front, and both

rear wheels together independently.

• Today, some vehicles have one wheel speed sensor per wheel for a total of

four. On these vehicles, the ABS computer can independently control brake

fluid hydraulic pressure on every wheel.

ABS Malfunction Indicator Lamp (MIL)

The dashboard or instrument panel of your vehicle contains a light labeled

something similar to ABS, or Anti-Lock, if the vehicle is ABS equipped. Some

vehicles will also have a light marked BRAKE. This light usually indicates a loss

of brake fluid hydraulic pressure or that the master cylinder is low on brake fluid.

Refer to your owner's manual for a description of the lights in your vehicle. Each

time your vehicle is started, the ABS computer performs a self-test called a

Drive Cycle during the first acceleration to make sure the ABS components are

working correctly. If the ABS computer detects a malfunction at completion of

the Drive Cycle, ABS will turn on the ABS MIL. When the ABS MIL is on, a

Diagnostic Trouble Code (DTC) is stored in the ABS computer. Once a repair

has been successfully made, the ABS computer, on most vehicles,

should turn off the ABS MIL at completion of the next Drive Cycle.

ABS Repair Tips

• Before servicing your ABS, refer to the manufacturer's recommendations.

• Torque the wheel lug nuts properly to avoid bending a rotor or drum, which

can cause inaccurate wheel speed sensor readings.

• Bleed the brake system properly.

• Always add fresh brake fluid to the master cylinder.

• Always replace tires with the manufacturer's recommended size.

• Always rotate tires as recommended by manufacturer.

• When interpreting DTCs retrieved from the vehicle, always follow the man-

ufacturer's recommendations for repair.

The Tool may not detect every malfunction. Do not take

chances with brakes, steering, or other vital functions of

your vehicle, as a serious accident could result. Always

follow vehicle manufacturer’s warnings, cautions, and

service procedures.

WARNING

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Actron CP9449 ABS BrakeScan Manuel d'utilisateur Page 14