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.
The numbers below refer to the step numbers in the diagnostic table.
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.
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.
Step | Action | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||||
Does the scan tool communicate with all of the control modules listed above? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||
3 | Use the scan tool in order to display DTCs for the following control modules:
Does the scan tool display any DTCs for the control modules listed above? | Go to Step 4 | |||||||||
Does the scan tool display any DTCs that begin with a "U", DTC C0292 or DTC C0297? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 | |||||||||
5 | Does the scan tool display DTC P0500, P0562, P0563, P0601, P0602, P0603, P0604, P0605, P1621, or P1381? | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.2L (L43) or Diagnostic Trouble Code (DTC) List in Engine Controls - 4.3L. | Go to Step 6 | ||||||||
6 | Does the scan tool display DTC B1367? | Go to Diagnostic Trouble Code (DTC) List in Instrument Panel, Gages, and Console |