Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0324: Knock Sensor (KS) Module PerformanceCircuit/System Description
The knock sensor (KS) is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine mechanical vibration. The KS system monitors the knock sensor in order to determine if detonation or spark knock is present. If the KS system determines that excessive knock is present, the engine control module (ECM) retards the spark timing based on the signal from the KS system. The KS produces an AC signal when specific frequencies are detected. The ECM then retards the timing until knock is controlled.
The ECM tests the functionality of the internal knock sensor signal evaluation circuitry. The KS circuitry within the ECM is responsible for receiving, amplifying, filtering, and evaluating the AC voltage and frequency from the knock sensors. The ECM performs two tests that determine if the internal circuitry within the ECM is functioning correctly.
Test One
The ECM internally turns OFF the knock sensor signal circuits. The ECM then applies different test signals to the internal KS circuitry to verify that each test signal output response is within range. If the ECM detects that any of the test signals are not within range, this DTC sets.
Test Two
The ECM internally turns OFF the knock sensor signal circuits. The ECM then tests for any output response when no test signals are applied. If the ECM detects an output response, this DTC sets.
Test Three
The ECM internally turns OFF the knock sensor signal circuits. The ECM generates an internal test pulse and monitors the return signal. If the return test pulse is less than a calibrated threshold, this DTC sets.
Conditions for Running the DTC
| • | Before the ECM can report DTC P0324 failed, DTC P0335, P0336, and P0338 must run and pass. |
| • | The ECM is controlling spark. |
| • | The engine coolant temperature is greater than 60°C (140°F). |
| • | The engine speed is within one of the following: |
| - | The rate at which the engine speed increases is less than 2,300 RPM per second. |
| - | The engine speed is between 1,000-4,800 RPM and steady. |
| • | The engine load is steady. |
| • | DTC P0324 runs continuously once the above conditions are met for a total 50 seconds. |
Conditions for Setting the DTC
| • | The ECM detects an incorrect response to the self tests performed on the internal KS circuitry. |
| • | The condition exists for greater than 4 seconds or for a cumulative of 50 seconds. |
Action Taken When the DTC Sets
DTCs P0324 is a Type B DTC.
Conditions for Clearing the DTC
DTCs P0324 is a Type B DTC.
Diagnostic Aids
The following table illustrates the ECM connector locations:
ECM Connector Location | |
|---|---|
X2 | X1 |
Front of Vehicle | |
Reference Information
Description and Operation
Knock Sensor (KS) System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Important: If you can hear an engine knock, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical .
- Observe and record the Freeze Frame/Failure Records for DTC P0324.
- Clear the DTCs with a scan tool.
- Turn OFF the ignition for 30 seconds.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure records. DTC P0324 should not set.
| ⇒ | If DTC P0335, P0336, or P0338 also set, refer to DTC P0335, P0336, or P0338 . |
| ⇒ | If DTC P0324 failed this ignition, replace the engine control module (ECM). |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming
