Notes On INTERMITTENTS: Notes

As with virtually any electronic system, intermittent failures in the Anti-lock 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.