Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Did you perform the Diagnostic System Check-Engine Controls? If yes, see appropriate ANTI-LOCK article in BRAKES. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.