Anti-Lock Brake System: Description
Anti-Lock Brake System (ABS) consists of hydraulic unit, actuator, solenoids, pump motor, ABS Electronic Control Unit (ECU), relays, deceleration sensor and wheel speed sensors. See Fig 1.
An ABS indicator light is located on the instrument cluster. Indicator light comes on for 3 seconds as a bulb test when ignition is turned on. A primary check is performed after each engine start and initial vehicle speed exceeds 6 MPH. An actuator noise is heard as vehicle is started or as speed exceeds 6 MPH. This is normal. Anti-lock systems remains active until vehicle speed drops below 3 MPH.
NOTE:
For more information on brake system, see BRAKE SYSTEM article in the BRAKES section.