Anti-Lock Brake System - 4WD: Description
CAUTION:
See ANTI-LOCK BRAKE SAFETY PRECAUTIONS
article in GENERAL INFORMATION.
NOTE:
For more information on brake system, see BRAKE SYSTEM article.
The Anti-Lock Brake System (ABS) is designed to prevent wheel lock-up during heavy braking. This allows operator to maintain steering control while stopping vehicle in shortest distance possible. Major components are a hydraulic unit assembly integrated with ABS Electronic Control Unit (ECU), wheel speed sensors, ABS rotors, "G" sensor, 4WD detection switch, free-wheel detection switch, ABS relay and ANTI-LOCK warning light. See Fig 1 .
ABS also has a self-diagnostic function, which enables technician to quickly trouble shoot system by monitoring stored ABS Diagnostic Trouble Codes (DTCs). See RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM .