Section 6 (Anti-Lock Brake System With Traction Control System - Abs-VI): Description

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 1999 Pontiac Sunfire, 1999 Pontiac Grand Am, 1999 Oldsmobile Intrigue, 1999 Oldsmobile Cutlass, and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION before servicing anti-lock brake system.

The Anti-Lock Brake System (ABS) with optional Traction Control System (TCS), or the optional Enhanced Traction System (ETS), is designed to prevent wheel lock-up during heavy braking. This provides improved driver control and reduces the distance required to stop vehicle. The system also monitors rear wheel speed and compares it to front wheel speed. TCS/ETS is operational at all vehicle speeds. If excessive front wheel speed is detected at either front wheel, TCS/ETS will be activated. TCS/ETS uses front brake intervention, fuel cut-off, spark retard or transmission upshift to provide improved traction.

Major system components include the Electronic Brake Control Module (EBCM) or Electronic Brake and Traction Control Module (EBTCM), speed sensors mounted at each wheel, at least 2, or as many as 3 instrument cluster warning indicators, brakelight switch mounted at brake pedal, electronic brake control relay located behind left side of instrument panel, TCS modulator/motor pack assembly located in engine compartment, and ABS modulator/motor pack assembly located in engine compartment, on brake master cylinder. ABS modulator/motor pack assembly houses electric pump motor and solenoid valves.

NOTE: For more information on brake system, see appropriate DISC & DRUM article.