Knock Sensor

A piezoelectric ceramic element is incorporated within each knock sensor. If engine knocking occurs because of detonation, 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 on GX470, see REMOVAL & INSTALLATION - GX470 article. For all other vehicles, see REMOVAL & INSTALLATION - EXCEPT GX470 article.