Diagnostic Circuit Check

Diagnostic Circuit Check





The Diagnostic Circuit Check is an organized approach to identifying a problem created by an Antilock Brake System (ABS) malfunction. It must be the starting point for any ABS complaint diagnosis because it directs the service technician to the next logical step in diagnosing the complaint.

Diagnostic Process
Perform the following steps in order when servicing the ABS/EBD system. Failure to do so may result in the loss of important diagnostic data and may lead to difficulties and time-consuming diagnosis procedures.
1. Perform the tests of the table below.
2. Perform a road test if directed by the table.
^ Test drive the vehicle while using the snapshot feature of the scan tool.
^ Perform normal acceleration, stopping and turning maneuvers.
^ If this does not reproduce the malfunction, perform an ABS stop on a low friction surface such as gravel.
3. Clear the Diagnostic Trouble Codes (DTCs) after all system malfunctions have been corrected.

Troubleshooting

Step 1-8:

Step 9-12: