P0325

CIRCUIT DESCRIPTION
The Knock Sensors (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 PCM malfunctions in a manner that will not allow proper diagnosis of the KS system.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0335, P0340, P0385, P0502, P0503, P1114, P1115, P1121, P1122, or P1336 are not set.
^ Engine speed is between 1000 and 3000 RPM.
^ Throttle angle is more than 15 percent.
^ Engine load is more than 45 percent.
^ Engine coolant temperature is more than 65°C (149°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 knock sensor diagnostic circuitry which will not allow proper diagnosis of the knock sensor circuit.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns the MIL off after three consecutive drive trips the that the diagnostic runs and does not fail.
^ A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ Use a scan tool in order to clear the DTC.

TEST

Steps 1-5: