Note on Intermittents

As with virtually any electronic system, intermittent failures in the Antilock Brake system may be difficult to accurately diagnose. If an intermittent condition is being diagnosed, the ABS self- diagnostic system can be used in the following manner to help isolate the suspect circuit:

^ First, display and record the code history data, and clear any TCS Diagnostic Trouble Codes which may be present in the EBTCM.

^ Then test drive the vehicle, attempting to repeat the failure condition. A description of the driving circumstances under which the failure occurs, if available, can be helpful in duplicating the condition.

^ After duplicating the condition, stop the vehicle and display any TCS Diagnostic Trouble Codes which may have been stored.

^ If no trouble codes were stored, it may become necessary to use symptom diagnosis.

If the system malfunction is not repeated during the test drive, a good description of vehicle behavior may be helpful in locating a 'most likely' component or circuit. The symptom diagnosis chart may also be useful in isolating the failure.