Circuit Description
The antilock brake system (ABS) Diagnostic System Check is an organized approach to identify problems associated with the electronic brake control module (EBCM). This check must be the starting point for any EBCM complaint, and will direct you to the next logical step in diagnosing the complaint. The EBCM is a very reliable component and is not likely the cause of the malfunction. Most system complaints are linked to faulty wiring, connectors, and occasionally to components. Understanding the ABS system and using the tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.
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 | ||||||||
2 |
Does the scan tool communicate with all control modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | ||||||||
3 | Select the display DTCs function on the scan tool for the following control modules:
Does the scan tool display any DTCs? | Go to Step 4 | |||||||||
4 | Does the scan tool display any DTCs which begin with a "U" ? | 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 any DTCs which begin with a "B"? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 | ||||||||
6 | Does the scan tool display any DTCs which begin with a "P"? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical |
