Knock Sensor: Description and Operation

Engine Control Components

Knock Sensor (KS)

- is used to detect engine detonation.
- sends a voltage signal to the PCM.
- is able to provide a signal which retards the ignition timing, as necessary.

The KS is a tuned accelerometer on the engine which converts engine vibration to an electrical signal. The PCM uses this signal to determine the presence of engine knock and to retard spark timing.

Two Types of Knock Sensor (KS):

Two Types of Knock Sensor (KS)