Diagnostic Instructions
DTC Descriptor
DTC P0325: Knock Sensor (KS) Module Performance
Circuit/System Description
The knock sensor (KS) enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The KS produces an AC voltage signal that varies
depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the KS signal. The ECM receives the KS signal through a signal circuit . The ECM supples a ground circuit to the KS through
a low reference circuit . The ECM also supplies a shielded ground circuit to the KS. The ECM learns a KS noise level at idle and uses calibrated values for the rest of the engine speed range. The ECM should monitor a normal KS signal within the noise channel.
Conditions for Running the DTC
| • | DTCs P0106, P0107, and P0108 are not set. |
| • | The engine speed is greater than 1600 RPM. |
| • | The engine coolant temperature (ECT) is greater than 50°C (122°F). |
| • | The manifold absolute pressure (MAP) is between 10 kPa and 50 kPa which depends on engine speed. |
| • | DTC P0325 runs continuously once the above conditions are met. |
Conditions for Setting the DTC
The control module has detected an internal circuitry fault.
Action Taken When the DTC Sets
DTC P0325 is a Type C DTC.
Conditions for Clearing the DTC
DTC P0325 is a Type C DTC.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Testing
Ignition ON, observe the DTC information with a scan tool. DTC P0325 should not set.
| ⇒ | If DTC P0325 failed this ignition, replace the ECM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming.
