Diagnostic System Check

Circuit Description
The ABS Diagnostic System Check is an organized approach to identifying problems associated with the EBCM. This must be the starting point for any ABS related concern and will direct you to the next logical step in diagnosing a malfunction. Most system malfunctions are linked to faulty wiring, connections and occasionally, to components. Understanding the ABS system and using the diagnostic tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a malfunction of the UART serial data circuit (EBCM) or a partial or total malfunction of the class 2 serial data circuit (PCM/VCM).





4. The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.