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Anti-Lock Brake System W/Traction Control System: Description

Anti-Lock Brake (ABS) and Traction Control (TRAC) system consists of ABS/TRAC Electronic Control Unit (ECU), actuator, solenoid relay, motor relay, TRAC OFF switch and speed sensors. See Fig 1.

An ABS warning light, SLIP indicator light and TRAC OFF indicator light is located on the instrument cluster. Indicator lights come on for 3 seconds as a bulb test when ignition is turned on. A primary system check is performed after each engine start. An ABS actuator noise is heard during this period of time and is normal.

Fig 1: Identifying ABS/TRAC Components
G00018567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: For more information on brake system, see DISC & DRUM - FWD CARS article.