Selecting Test Mode

WARNING: This page is about a different car, the 1994 Pontiac Grand Am, 1994 Oldsmobile Achieva, and 1994 Buick Skylark. However, it is still accessible from the selected car via links, so may be relevant.

Following test modes are available for diagnosing ABS:

Mode F0 (Data List)

Mode displays actual reading sent to EBCM by each wheel speed sensor. While vehicle is driven, wheel speed information can be observed to determine if readings are comparable to actual vehicle speed. Stoplight switch status can be observed by pressing brake pedal.

Mode F1 (DTC History)

Mode displays trouble code history data. Data includes number of ignition cycles since trouble code occurred. Up to 5 fault codes are included in ABS history data.

Mode F2 (Diagnostic Trouble Codes)

Mode displays ABS Diagnostic Trouble Codes (DTC) stored by EBCM. Tech 1 will display any DTCs and brief description of DTC displayed. If no DTCs are stored, Tech 1 will display NO ABS CODES.

Mode F3 (ABS Snapshot)

Mode helps isolate intermittent problems by capturing data before and after fault occurred. By selecting MANUAL TRIGGER, Tech 1 will wait for ENTER to be pressed before storing speed sensor information. All stored information can be displayed and examined for conditions that may indicate problem.

Mode F4 (ABS Test)

In this mode, Tech 1 performs hydraulic modulator assembly testing to help isolate problems during trouble shooting. Mode is also used for manual control of hydraulic modulator motors, which is used before brakes are bled.