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.

P0324 or P0326

The control module detects an overactive knock sensor.

P06B6

The control module detects an internal circuitry fault.

DTCs P0324, P0326, and P06B6 are Type B DTCs.

DTCs P0324, P0326, and P06B6 are Type B DTCs.

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

1. Engine idling, observe the DTC information with a scan tool. Verify DTC P0327, P0328, and P06B6 is not set.

⇒	If DTC P0327 or P0328 is set with P06B6, refer to DTC P0325, P0327, or P0328 for further diagnosis.

⇒	If DTC P06B6 is set, replace the ECM.

2. Ignition OFF, inspect for the following:

•	Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set

•	Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant. The KS mounting surface should be free of burrs, casting flash, and foreign material

•	The KS must be clear of hoses, brackets, and engine electrical wiring

•	Inspect for loose accessory brackets

•	Inspect for serpentine belt and tensioner wear

•	Inspect for an engine mechanical condition--Refer to Symptoms - Engine Mechanical

⇒	If a condition is found, repair as necessary.

3. If there is no mechanical condition, test or replace the KS sensor.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.