16 Knock Sensor #1 Circuit

16 KNOCK SENSOR #1 CIRCUIT





The knock sensor serves as an input to the Powertrain Control Module (PCM) to aid in the reduction of detonation by reducing ignition timing. The sensor consists of a piezoelectric material that vibrates as the engine runs, sending an AC voltage signal to the PCM. The voltage produced increases with the frequency of vibration. When the signal reaches a preset threshold, the PCM retards ignition timing to reduce engine knock.

The PCM records a Diagnostic Trouble Code (DTC) when the knock sensor produces lower than normal voltage while the engine is operating at specific engine loads and RPMs.

The Knock Sensor #1 Circuit malfunction possibly could be caused by problems with any of the following components:

- Knock sensor
- Knock sensor wiring or related connectors (open or short)
- PCM