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Home >> Chevrolet >> 1994 >> Astro Van Cargo Extended, 4.3 Z >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Knock Sensor (KS)
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Knock Sensor (KS)

The knock sensor is a piezoelectric device which detects abnormal engine vibrations (spark knock) in the engine. This vibration results in the production of a very low AC signal, which is sent from the knock sensor to the PCM . The PCM then retards ignition timing until the engine knock ceases.

NOTE: For additional information on knock sensor operation, see ESC DETONATION RETARD OPERATION under IGNITION TIMING CONTROL SYSTEMS.

A fault in the ESC circuit may set a related trouble code. When a related trouble code is not present and the ESC system is the suspected cause of a driveability problem, perform functional check of ESC system. See SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.

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