P0325

Circuit Description
The Control Module (PCM/VCM) contains a removable Knock Sensor Module which receives the Knock sensor input. The Knock Sensor signal input is filtered by this module before it is input to the Control Module. Spark knock is continuously monitored during engine operation. If knock occurs for longer than a calibrated time, this DTC will set.

Conditions for Running the DTC
^ DTC P0327 is not active
^ The engine run time is 120 seconds or greater
^ The system voltage is between 10-17.1 volts

Conditions for Setting the DTC
The VCM detects engine knock for more than 5 seconds

Action Taken When the DTC Sets
^ The Control Module illuminates the Malfunction Indicator Lamp (MIL) if a failure is detected during 2 consecutive key cycles.
^ The Control Module will set the DTC and records the operating conditions at the time the diagnostic fails. The Control Module stores the failure information in the scan tools Freeze Frame and/or the Failure Records.

Conditions for Clearing the MIL/DTC
^ The Control Module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
^ Use the scan tool Clear Information function.

Diagnostic Aids
Check for the following conditions:
^ A damaged or improperly installed Knock Sensor module. Check for the following items:
- Bent pins
- Deformed terminals
- A Knock Sensor module that is not completely seated
^ Improper knock sensor torque specification. Refer to Component Tightening Notice in Service Precautions. Torque the knock sensor to 19 N.m (14 lb ft).
^ A misrouted wiring harness
Refer to Symptoms. Symptom Related Diagnostic Procedures

Review the Fail Records vehicle mileage since the diagnostic test last failed to determine how often the conditions occur that caused the DTC to set. This may assist in diagnosing the condition.

An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step ensures that the condition is present.
5. This step checks for an improperly installed Knock Sensor module.