Principles of Operation

Principles of Operation

Anti-Lock Brake System (ABS) with Traction Control
The anti-lock brake system (ABS) module manages the anti-lock braking, while the traction control and engine control systems maintain vehicle control during deceleration and acceleration.

When the ignition switch is in the RUN position, the ABS module does a preliminary electrical check and, at approximately 6 km/h (4 mph), the hydraulic pump motor is turned ON for approximately 1 1/2 second. Any malfunction of the ABS module disables the system and the ABS warning indicator illuminates. However, the power-assist braking system functions normally.

The traction control system controls wheel spin by modulating engine torque and applying, then releasing, the appropriate rear brake to restore traction when driving on slippery or loose surfaces.

Electronic Brake Distribution (EBD)
The electronic brake distribution (EBD) controls rear brake pressure and acts as an electronic proportioning valve. It is controlled by the ABS module. EBD remains functional if there are 1 or 2 wheel speed sensor faults. When EBD is disabled, the red brake warning indicator illuminates.

ABS Module Configuration
The ABS module must be configured when a new ABS module is installed. Refer to Information Bus (Multiplex Configurations Network).