P0325

Schematic:

CIRCUIT DESCRIPTION
The Knock Sensor (KS) system detects for an engine detonation. The knock sensor produces an AC voltage signal. The amplitude and the frequency of the AC voltage signal is dependent upon the knock level being detected. This signal then travels to the KS module that is an internal pant of the Powertrain Control Module (PCM). If knock is detected, the PCM will retard the spark timing based on the signal from the KS.

CONDITIONS FOR RUNNING THE DTC
^ Engine run time is more than 20 seconds.
^ The Engine Coolant Temperature (ECT) is more than 56°C (131°F).
^ Engine speed is above 1600 RPM.
^ The Manifold Absolute Pressure (MAP) is more than 35 kPa.
^ DTCs P0122, P0123 are not set.
^ Engine vacuum is less than 45 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 Malfunction Indicator Lamp (MIL) will illuminate.
^ The PCM will record operating conditions at the time the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information.
^ A history DTC is stored.
^ The PCM will default to a more conservative spark timing.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The MIL will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault.
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ A scan tool can clear the DTCs.

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

DIAGNOSTIC AIDS
^ Check and correct any abnormal engine noise before using the diagnostic table.
^ Thoroughly check any suspected circuitry for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed connectors
- Damaged terminals
- Poor terminal to wiring connections
- Physical damage to the wiring harness