P0325

CIRCUIT DESCRIPTION

This diagnostic DTC is used to check the PCM and its Knock Sensor (KS) module. The PCM has stored a calibrated time that it considers to be a valid spark knock duration. If the PCM sees a knock event that was longer in duration than the acceptable time, the PCM sets DTC P0325.

CONDITIONS FOR SETTING THE DTC

Test Conditions

^ Test continuously.
^ Ignition voltage 11 volts or more.

Failure Condition

The knock sensor reports a knock event longer than 99.99 milliseconds for 3 seconds continuously.

ACTION TAKEN WHEN THE DTC SETS

^ Ignition control uses the 87 octane spark advance.
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) after two consecutive drive trips that the diagnostic runs and fails.
^ The PCM will record operating conditions at the time the DTC sets. This information will be stored in the Freeze Frame and Failure Records.
^ A first failure of this DTC will store in Last Test Failed but not History.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
^ A Last Test Failed DTC will clear when the diagnostic runs and does not fail.
^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any diagnostic test.
^ PCM battery voltage is interrupted.
^ Using a Scan tool.