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P0330




DTC P0324, P0325, P0326, P0327, P0328, P0330, P0331, P0332, or P0333

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provide an overview of each diagnostic category.

DTC Descriptors
DTC P0324
- Knock Sensor (KS) Module Performance

DTC P0325
- Knock Sensor (KS) Circuit Bank 1

DTC P0326
- Knock Sensor (KS) Performance

DTC P0327
- Knock Sensor (KS) Circuit Low Voltage Bank 1

DTC P0328
- Knock Sensor (KS) Circuit High Voltage Bank 1

DTC P0330
- Knock Sensor (KS) Circuit Bank 2

DTC P0332
- Knock Sensor (KS) Circuit Low Voltage Bank 2

DTC P0333
- Knock Sensor (KS) Circuit High Voltage Bank 2

Diagnostic Fault Information





Circuit/System Description

The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The engine control module (ECM) monitors 2 separate KS, located under the intake manifold. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The control module receives the KS signal through 2 isolated signal circuits. The control module adjusts the spark timing based on the amplitude and frequency of the KS signal.

Conditions for Running the DTC

* DTC P0324 runs continuously when the engine speed is greater than 2,000 RPM and the engine load is greater than a calibrated amount.
* DTC P0326 runs continuously when:

- The engine speed is greater than or equal to 800 RPM.
- The MAP is greater than 42 kPa.
- DTCs P0120, P0121, P0122, or P0123 are not set.

* DTC P0325, P0330, P0327, P0328, P0332, P0333 run continuously when:

- The engine coolant temperature (ECT) is greater than 75°C (167°F).
- The engine run time is greater than 90 s.

Conditions for Setting the DTC

P0324

The control module has detected an internal circuitry fault.

P0325 and P0330

The KS signal circuits are open or shorted together for up to 6 s.

P0326
* The KS signal indicates a noisy engine component (e.g. loose bracket, noisy lifter).
* The control module commanded spark retard at a given engine load and speed is more than the calibrated value.
* The above conditions exist for 5 s.

P0327, P0328, P0332, and P0333

The KS signal circuits are shorted to ground or power.

Action Taken When the DTC Sets

* DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333 are type B DTCs.
* Spark timing will be retarded to reduce spark knock and may cause reduced engine power.

Conditions for Clearing the MIL/DTC

DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333 are type B DTCs.

Diagnostic Aids

* 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 must be free of burrs, casting flash, and foreign material.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)

Inline Harness Connector End Views (Connector End Views By Number)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
* Measuring Frequency (Measuring Frequency)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Engine at operating temperature, all accessories OFF, and engine speed greater than 2,000 RPM, observe the Knock Retard and Total Knock Retard parameters. The parameters should be 0°.
2. Engine idling, move the related harnesses and connectors for the KS circuits while observing the scan tool Knock Retard and Total Knock Retard parameters. The parameters should remain steady with no abrupt changes.
3. 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.

Circuit/System Testing

P0324

This DTC indicates an internal control module circuitry failure. Replace the engine control module (ECM).

P0325, P0327, P0328, P0330, P0332, and P0333
1. Ignition ON, engine OFF
2. Disconnect the Engine Harness to the Engine Jumper Harness at the driver's side of the engine.
3. Measure for 2-3 V between each of the following circuits and ground on the ECM side of the harness connector.

* Knock sensor bank 1 signal circuit terminal G
* Knock sensor bank 1 signal circuit terminal H
* Knock sensor bank 2 signal circuit terminal J
* Knock sensor bank 2 signal circuit terminal K

• If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
• If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.

4. Test the KS circuits on the KS side of the connector for the following:

* Open/high resistance
* Short to ground
* Short to any other circuit

5. If all circuits test normal, replace the appropriate KS.

P0326

Important: If DTC P0325, P0327, P0328, P0330, P0332, P0333, P0335, or P0336 are also set, diagnose those DTCs first.


* Inspect for a loose or broken vehicle accessory or accessory bracket.
* Inspect for excessive engine mechanical noise.

Component Testing

1. KS 1: Connect the DMM between the KS signal terminals G and H on the KS side of the Engine Harness to the Engine Jumper Harness connector.
OR
2. KS 2: Connect the DMM between the KS signal terminals J and K on the KS side of the Engine Harness to the Engine Jumper Harness connector.
3. Set the DMM to the 400 mV AC Hz scale and wait for the DMM to stabilize at 0 Hz.

Important: DO NOT tap on plastic engine components.


4. Tap on the engine block with a non-metallic object near the KS while observing the signal indicated on the DMM.
5. The DMM should display a fluctuating frequency while tapping on the engine block.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming
* Knock Sensor Replacement (Service and Repair)
* Symptoms - Engine Mechanical (Symptoms - Engine Mechanical)
* Symptoms - Engine Controls (Symptoms - Engine Controls)

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