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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Knock Sensor

Knock Sensor

A piezoelectric ceramic element is incorporated within each knock sensor. If engine knocking occurs because of detonation, the piezoelectric element vibrates, generating voltage. Based on this voltage signal, Engine Control Module (ECM) retards ignition timing. All models are equipped with 2 knock sensors. For knock sensor location, see REMOVAL, OVERHAUL & INSTALLATION article.

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