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Intermittent Failures

Intermittent failures may cause "malfunction" light to flicker or illuminate and go out after the intermittent fault goes away. The corresponding trouble code, however, will be retained in control unit memory. If related fault does not reoccur within a certain time frame, related trouble code will be erased from control unit memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See INTERMITTENTS in TESTS W/O CODES article.

NOTE: ECU abnormal diagnostic memory is kept by direct power from battery. Memory is not erased by turning ignition off, but will be erased if battery or ECU is disconnected. Oxygen sensor memory is erased when ignition is turned off. To diagnose oxygen sensor, drive vehicle a good distance and keep engine running.
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