For 1990-2009 cars

### 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 Descriptor

DTC P0324: 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

• | The engine speed is greater than 2,200 RPM.

• | The engine coolant temperature (ECT) is greater than 40°C (104°F).

• | DTC P0324 runs continuously once the above conditions are met.

### Conditions for Setting the DTC

The ECM has detected an internal circuitry fault.

### Action Taken When the DTC Sets

DTC P0324 is a Type B DTC.

### Conditions for Clearing the DTC

DTC P0324 is a Type B DTC.

### Reference Information

#### Description and Operation

Knock Sensor (KS) System Description

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Testing

Ignition ON, observe the DTC information with a scan tool. DTC P0324 should not set.

⇒ | If DTC P0324 failed this ignition, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming