P0327

CIRCUIT DESCRIPTION
The knock sensor (KS) produces an alternating current voltage at all engine speeds and at loads. The powertrain control module (PCM) adjusts spark timing based on the amplitude and on the frequency of the KS signal. The PCM uses the KS signal in order to calculate the average voltage and assigns a voltage value. The PCM inspects the KS and the related wiring by comparing the actual knock signal to the assigned voltage range. A normal KS signal should stay outside the assigned voltage range. This DTC will set if the KS signal is within the assigned voltage range or if the KS signal is not present.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0336, P0341, P0502, P0503, P1114, P1115, P1121 P1122, or P1336 are not set.
^ The engine speed is between 1,000-5,000 RPM.
^ The engine has been running for a minimum of 30 seconds.
^ The throttle angle is more than 15 percent.
^ The engine load is more than 45 percent.
^ The engine coolant temperature (ECT) is more than 60°C (140°F).
^ The maximum spark retard is less than 15 degrees.
^ The system voltage is more than 9 volts.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects a KS signal voltage within the average voltage range for at least 10 seconds.
^ The engine run time is more than 30 seconds.

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

IMPORTANT: If the KS is dropped, the KS must be replaced.

^ Inspect the KS for proper installation. A KS that is loose or over torqued may cause the DTC to set.
^ If the condition is intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-7:

Steps 8-12:

The numbers below refer to the step numbers on the diagnostic table.
3. This step ensures that the malfunction is present.
5. Tapping on the engine block will simulate an engine knock.