Anti-Lock Brake System: Description
NOTE:
For more information on brake system, see BRAKE SYSTEM - FWD CARS article.
Anti-Lock Brake System (ABS) consists of an ABS Electronic Control Unit (ECU), solenoid relay, motor relay, actuator and 4 speed sensors. See Fig 1.
An ABS indicator light is located on the instrument panel. This light illuminates 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.