P0330

DTC P0330

CIRCUIT 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 KS produces an AC signal that varies at all engine speeds and loads. The ECM makes adjustments to the spark timing based on the amplitude and frequency of the KS signal. The ECM receives the KS signal through a signal circuit. The KS ground is supplied by the ECM through a low reference circuit. The ECM uses the KS to calculate the amount of normal engine noise (a noise channel) for a wide range of engine speeds and loads. The ECM compares the actual KS signal to the learned noise channel. The ECM uses the noise channel in order to diagnose the KS and the related wiring. If the ECM detects a loss of the noise channel, a DTC will set. DTC P0325 refers to the bank 1 sensor. DTC P0330 refers to the bank 2 sensor.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC P0325 Knock Sensor (KS) Circuit Bank 1
- DTC P0330 Knock Sensor (KS) Circuit Bank 2

CONDITIONS FOR RUNNING THE DTC
- DTCs P0315, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391 are not set.
- The engine speed is more than 1,400 RPM.
- The engine load meets or exceeds a calibrated specification.

CONDITIONS FOR SETTING THE DTC
The ECM detects a KS signal that is out of the calibrated range.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that 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 MIL/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 current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

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 should be free of thread sealant. The KS mounting surface should be free of burrs, casting flash, and foreign material.
- For an intermittent condition, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Step 1 - Step 6:

Step 7 - Step 15:

The numbers below refer to the step numbers on the diagnostic table.
5. If the KS signal circuit or the KS low reference circuit is shorted to voltage, the KS may still produce a signal.
6. If the KS signal circuit or the KS low reference circuit is shorted to ground, the KS may still produce a signal.