DTC P0325: Knock Sensor Circuit: Description

Knock sensor circuit is monitored with ignition on and engine running. DTC will set in Powertrain Control Module (PCM) when knock sensor circuit voltage falls to less than a minimum value at idle or deceleration. The minimum value is from a look-up table internal to PCM and is based on engine RPM. DTC will also set if sensor output voltage is more than 5 volts. Possible causes are: signal circuit open or shorted, sensor ground circuit open, defective knock sensor or defective PCM.