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Home >> Lexus >> 2001 >> LS 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0325/P0330: Knock Sensor Circuit Malfunction >> Circuit Description

Circuit Description

Knock sensors are located under intake manifolds, on inside of cylinder block. Knock sensors generate voltage when engine block vibrates due to knocking. If engine knocks, ECM will retard ignition timing. If DTC is set, ECM will operate in fail-safe mode (maximum timing retardation). DTC is set when there is no knock sensor signal to ECM with engine speed of 1700-5400 RPM. DTC P0325 is for knock sensor No. 1 on left side of cylinder block. DTC P0330 is for knock sensor No. 2 on right side of cylinder block. Possible causes are:

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