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 interupted.

^ Using a Scan tool.