Previa Van 4WD L4-148.8 2438cc 2.4L DOHC (2TZ-FE) (1991)
Knock Sensor: Description and Operation
This sensor is mounted on the engine block and monitors ignition knock (detonation). When the ECU receives a knock signal, it retards timing until
detonation ceases. This control prevents internal damage to engine valves and pistons. The knock sensor inputs the ECU through terminal KNK.