Circuit Description
This diagnostic DTC is used to check the PCM and its Knock Sensor (KS) module. The PCM has been stored with 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 Running the DTC
| • | Test continuously. |
| • | Ignition voltage 11 volts or more. |
Conditions for Setting the DTC
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. |
| • | Use a scan tool to clear DTCs. |
| • | Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Does DTC P0325 reset? | -- | ||
3 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the replacement complete? | -- | -- | |
4 | Replace the KS module. Refer to Knock Sensor Module Replacement . Is the replacement complete? | -- | -- |
