Diagnostic System Check

Diagnostic System Check - ABS





Test 1-2





Test 3-8

Circuit Description
The ABS Diagnostic System Check is an organized approach to identifying problems associated with the ABS. 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 in the diagnostic table.
2. Lack of communication may be due to partial or total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
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. The Electronic Brake Control Module (EBCM) software does not support DTCs which begin with a "U". The EBCM may set DTC C0290, C0292 or C0297 to indicate a communication failure between the EBCM and the Powertrain Control Module (PCM).
5. These DTCs may be set by the PCM and may effect the rear wheel speed input to the EBCM or indicate an internal failure within the PCM.
6. This DTC may be set by the Instrument Panel Cluster (IPC) and effects the IPC's ability to illuminate indicators.
7. These DTCs may be set by the suspension control module (RTD) and may effect VSES system operation. These DTCs do not effect ABS systems on vehicles which are not equipped with JL4.
8. These DTCs may be set by the suspension control module (RTD) and may effect VSES system operation. These DTCs do not effect ABS systems on vehicles which are not equipped with JL4.