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P0330



DTC P0330

DTC DESCRIPTOR

DTC P0324
Knock Sensor (KS) Module Performance

DTC P0325 and P0330
Knock Sensor (KS) Circuit

DTC P0326
Knock Sensor (KS) Performance

DTC P0327 and P0332
Knock Sensor (KS) Circuit Low Frequency

DTC P0328 and P0333
Knock Sensor (KS) Circuit High Frequency

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






CIRCUIT/SYSTEM DESCRIPTION
The knock sensor (KS) system 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 ECM monitors 2 separate KS, one on each side of the engine block. Each KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM adjusts the spark timing based on the amplitude and frequency of each KS signal. The ECM receives the KS signal through 2 different signal circuits. Each KS ground is supplied by the ECM through a low reference circuit. The ECM uses the KS signal to calculate the average voltage, then assign a voltage range value. The ECM will then monitor for a normal KS signal within the assigned voltage range.

CONDITIONS FOR RUNNING THE DTC
- DTC P0325, P0330 and P0326 run continuously when the engine speed is greater than 1,800 RPM, and the manifold absolute pressure (MAP) is greater than 55 kPa.
- DTC P0324, P0327, P0328, P0332, and P0333 run continuously when the ignition is ON or the engine is running.

CONDITIONS FOR SETTING THE DTC

DTC P0324
The control module has detected an internal circuitry fault.

DTC P0325 and P0330
The KS signal circuits are open or shorted together for 5 seconds.

DTC P0326
- The KS signal indicates an engine knock is present.
- The ECM has commanded the spark retard to a value, which is more than the calibrated valve, for a specific engine load and speed.
- The above conditions exist for more than 5 seconds.

DTC P0327, P0328, P0332, and P0333
The KS signal circuits are shorted to voltage or ground.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm up cycles if no failures are reported by this or any other emission related diagnostic.
- A current DTC last test failed clears when the diagnostic runs and passes.
- Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS
- Inspect the KS for physical damage.
- 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 burs, casting flash, and foreign material.
- This test procedure requires that the vehicle battery has passed a load test and is completely charged.
- When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion, and the mating electrical terminals for tightness.
- Use the J 35616 for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals.

CIRCUIT/SYSTEM VERIFICATION
1. Disconnect both KS electrical connectors.
2. Connect one test lead from the DMM to the signal circuit terminal on the KS, and the other test lead form the DMM to the low reference circuit terminal on the KS.
3. Set the DMM to the 40 mV AC hertz scale, and wait for the DMM to stabilize at 0 Hz.
4. Tap on the engine block with a non-metallic object near the KS while observing the Hz signal indicated on the DMM display.

IMPORTANT: DO NOT tap on plastic engine components.

5. The DMM should display a fluctuating frequency while tapping on the engine block.
6. Repeat the above procedure for the KS on the opposite side of the engine block.
- If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list. The other option is to refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

CIRCUIT/SYSTEM TESTING

DTC P0324
This DTC indicates a KS circuit failure internal to the ECM. Replace the ECM.

DTC P0325, P0327, P0328, P0330, P0332, P0333
1. Turn OFF the ignition.
2. Disconnect the KS electrical connector.
3. Measure for infinite resistance between the signal circuit terminal at the KS, and to a good engine ground, with a DMM.
- If continuity is detected on the signal circuit, replace the KS.
4. Measure for infinite resistance between the low reference circuit terminal at the KS and to a good engine ground with a DMM.
- If continuity is detected on the low reference circuit, replace the KS.
5. Turn ON the ignition, with the engine OFF.
6. Measure for voltage at the KS signal circuit terminal, on the wire harness electrical connector, for the KS.
- If the KS signal circuit measures more than 4.2 volts, test for a short to voltage or a faulty ECM.
7. Measure for voltage at the KS low reference circuit terminal, on the wire harness electrical connector, for the KS.
- If the KS low reference circuit measures more than 4.2 volts, test for a short to voltage, or a faulty ECM.
8. Test the KS signal circuit and the KS low reference circuit for the following conditions:
- An open
- A short to ground
- High resistance-All wire circuit resistance must measure less than 5 ohms.
- If the KS and wire circuits test normal, replace the ECM.

DTC P0326
- Inspect for a loose or broken vehicle accessory or accessory bracket.
- Inspect for excessive engine mechanical noise.


REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Knock Sensor (KS) Replacement
- Control Module References
- Symptoms - Engine
- Symptoms - Computers and Control Systems Verification Tests
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