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Home >> Lexus >> 2002 >> IS 300 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0325 Or DTC P0330: Knock Sensor Circuit Malfunction >> Circuit Description
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Circuit Description

Knock sensors are located on front and rear left side of cylinder block. Sensor generates 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 1600-5200 RPM. DTC P0325 is for knock sensor No. 1 on front of cylinder block. DTC P0330 is for knock sensor No. 2 on rear of cylinder block. Possible causes are:

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