Circuit Description

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

Knock sensors are located on either side of cylinder block under intake manifold. Knock sensor generates voltage when engine block vibrates due to knocking. DTC P0325 is for bank that includes cylinder No. 1. DTC P0330 is for bank that does not include cylinder No. 1. DTC P0325 is set when there is no knock sensor No. 1 signal to ECM with engine speed 2000-5400 RPM. Possible causes are:

Open or short in knock sensor No. 1 circuit.
Knock sensor No. 1 loose or under torqued.
Defective ECM.

DTC P0330 is set when there is no knock sensor No. 2 signal to ECM with engine speed 2000-5400 RPM. Possible causes are:

Open or short in knock sensor No. 2 circuit.
Knock sensor No. 2 loose or under torqued.
Defective ECM.