P0325

DTC P0325 Knock Sensor Module Performance




Circuit Description
The controls 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 controls 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 more than 120 seconds.
- 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 sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool's Freeze Frame and 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. A warm up cycle occurs when the coolant temperature has risen 22° C (40° F) from the startup coolant temperature and the engine coolant reaches a temperature that 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
- knock sensor module is not completely seated
- Improper knock sensor torque specification.

NOTE: Refer to Component Tightening Note in Service Precautions.

- Torque the knock sensor to 19 N.m (14 lbs ft).
- A misrouted harness

Refer to Symptoms.
Review the Fail Records vehicle mileage since the diagnostic test last failed in order to help 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 Testing for Intermittent and Poor Connections.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs.

Steps 1 - 2:

Steps 3 - 6:

Steps 7 - 9:

Step 10:

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.