P0325

CIRCUIT DESCRIPTION
The Knock Sensor (KS) produces an AC voltage at all engine speeds and loads. The Powertrain Control Module (PCM) then adjusts the spark timing based on the amplitude and frequency of the KS signal. The PCM uses the KS signal to calculate the average voltage. Then the PCM assigns a voltage value. The PCM checks the knock sensor and 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 not present or if the PCM malfunctions in a manner that will not allow proper diagnosis of the KS system.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0122 or P0123 are not set.
^ The engine run time is more than 20 seconds.
^ The Engine Coolant Temperature (ECT) is more than 56°C (131°F).
^ The engine speed is between 1,600-6,400 RPM.
^ The Manifold Absolute Pressure (MAP) is more than 60 kPa.

CONDITIONS FOR SETTING THE DTC
^ The KS voltage and variation is not within normally expected ranges.
^ The above conditions are present for more than 15 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.
^ Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS
Check the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause the DTC to set.

If this DTC is determined to be intermittent, refer to Intermittent Conditions. Intermittent Conditions

Check and correct any abnormal engine noise before using the diagnostic table.

TEST

Steps 1-3:

Steps 4-10: