DTC P0325: Knock Sensor Circuit Malfunction: General Description

The knock sensor is mounted on the engine block and detects engine knocking. The vibrations caused by the knocking are converted into electrical signals through the piezo ceramic element. The engine control module (ECM) controls the ignition timing based on the electrical signals. If the signals from the knock sensor do not vary for a set time, the ECM detects a malfunction and stores a DTC.