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Home >> Chevrolet >> 1987 >> Cavalier CS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> V6/V8 PFI Component Test >> Diagnostic System Operation >> "Intermittent Failures"

"Intermittent Failures"

Intermittent failures cause "SERVICE ENGINE SOON" light to flicker or illuminate and go out about 10 seconds after the intermittent fault goes away. The corresponding trouble code, however, will be retained in ECM memory. If related fault does not reoccur within 50 engine restarts, related trouble code will be erased from ECM memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See INTERMITTENTS in the CEC TESTS W/O CODES article in this section.

NOTE: Trouble codes will be recorded at various operating times. Some codes require operation of that sensor or switch for 5 seconds. Others may require operation for 5 minutes or longer under engine load. For code testing procedures, refer to the V6 & V8 PFI TESTS/CODES article in this section.
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