Knock Sensor

Knock sensor (detonation sensor) is located on lower left side of cylinder block just above oil pan. Knock sensor picks up detonation vibration from engine and converts it to an electrical signal for use by ECU.

ECU uses this information to determine when a change in ignition timing is required. Knock sensor allows for engine operation on either "premium" unleaded or "regular" unleaded fuel.

When knock occurs, ECU retards ignition timing in one or more cylinders until detonation is eliminated.