DTC P0325 Knock Sensor Module Performance. Cadillac Concours 1996

For 1990-2009 cars
Engine Controls Components
Ignition Control (IC) Module
OBD II Symbol Description Notice
ESD Notice

### 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.

• | 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 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to A Powertrain On Board Diagnostic (OBD) System Check

2

1. Turn the key to OFF.
2. Remove Knock Sensor (KS) module from PCM.
3. Insert known good knock sensor module.
4. Connect a scan tool.
5. Using Failure Rec. snapshot data duplicate conditions under which DTC P0325 originally set.
6. Observe Fail This Ign..

Does DTC P0325 reset?

--

Go to Step 3

Go to Step 4

3 | Replace the PCM. Refer to PCM Replacement/Programming . Is the replacement complete? | -- | Go to Powertrain Control Module Diagnosis for Verify Repair | --
4 | Replace the KS module. Refer to Knock Sensor (KS) Module Replacement . Is the replacement complete? | -- | Go to Powertrain Control Module Diagnosis for Verify Repair | --