Circuit Description
WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Knock sensors are located on both sides of cylinder block to detect engine knocking. Knock sensor generates voltage when engine block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it. DTC is set when there is no knock sensor signal to ECM with engine speed 2000 RPM or more. ECM will operate in fail-safe mode if DTC P0325 or DTC P0330 are set. Possible causes are:
- Knock sensor circuit is open or shorted.
- Defective or loose knock sensor.
- Defective ECM.