Anti-Lock Brake System: Description

The Anti-Lock Brake System (ABS) consists of an ABS Electronic Control Unit (ECU), control relay, actuator, deceleration sensor (All-Trac), and 4 speed sensors. See Figure.

An ABS indicator light is located on the instrument panel. This light comes on for 3 seconds as a bulb test when ignition is first turned on. A primary check is performed after each engine start, and initial vehicle speed exceeds 4 MPH. If brake pedal is pressed before vehicle exceeds 4 MPH, primary check will not occur until brake pedal is released.