P0325

CIRCUIT DESCRIPTION
The Knock Sensors (KS) produce an AC signal under all engine operating conditions. The Powertrain Control Module (PCM) calculates the average voltage range of each knock sensors signal. If the KS system is operating normally, the PCM should monitor the KS signal voltage varying above and below the calculated average range. This DTC will set if the PCM malfunctions in a manner which will not allow proper diagnosis of the KS system.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0117, P0118, P0121, P0122, P0123, P0125, P0336, P0341, P0502, P0503, P1114, P1115, P1121 are not set.
^ Engine speed is between 1000 and 2500 RPM.
^ Throttle angle is more than 10 percent.
^ Engine load is more than 40 percent.
^ Engine Coolant Temperature (ECT) is more than 60°C (140°F).
^ Maximum spark retard is less than 15 degrees.
^ System voltage is more than 9 volts.
^ Engine run time is more than 30 seconds.

CONDITIONS FOR SETTING THE DTC
The PCM detects a malfunction in the integrated KS diagnostic circuitry which will not allow proper diagnosis of the KS system.

ACTION TAKEN WHEN THE DTC SETS
^ First failure:
- The MIL is not turned ON.
- A DTC is stored in memory under Failed Last Test.
- The Failure Records are stored.
^ Second consecutive drive cycle with a failure:
- The MIL is turned ON.
- A DTC is stored in memory under history.
- The Freeze Frame data is stored.
- The Failure Records are stored.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after the third consecutive trip the diagnostic has run and passed.
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

TEST

Steps 1-5: