P0332

DTC P0327 or P0332

Circuit Description

The knock sensor (KS) system enables the powertrain control module (PCM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The PCM monitors 2 KS. Both sensors are located on the intake side of the engine block. KS 1 is located at the front of the engine. KS 2 is located at the rear of the engine. Each KS produces an AC voltage signal that varies at all engine speeds and loads. The PCM adjusts the spark timing based on the amplitude and the frequency of the KS signal. The PCM receives the KS signal through 2 isolated signal circuits. The PCM uses the KS signal to calculate the average voltage and then assigns a voltage range value. The PCM should monitor a normal KS signal within the assigned voltage range. If the PCM detects a KS signal outside of the assigned voltage range, or the KS signal is not present, this DTC will set. DTC P0327 refers to KS 1. DTC P0332 refers to KS 2.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC P0327 Knock Sensor (KS) 1 Circuit Low Frequency
* DTC P0332 Knock Sensor (KS) 2 Circuit Low Frequency

Conditions for Running the DTC

* DTCs P0117, P0118, P0122, and P0123 are not set.
* The engine speed is equal to or greater than 1,800 RPM.
* DTC P0327 and P0332 runs continuously once the above conditions are met.

Conditions for Setting the DTC

The KS signal is outside of the assigned voltage range or the signal is not present for 6 seconds.

Action Taken When the DTC Sets

* The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

* The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

* Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
* Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS and the KS fastener should be free of thread sealant. The KS mounting surface must be free of burrs, casting flash, and foreign material.
* The KS should be clear of hoses, brackets, and Starting and charging wiring.
* For an intermittent condition, refer to Intermittent Conditions. Intermittent Conditions

Test Description

Step 7 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
2. This step ensures that the malfunction is present.
3. This step tests for a KS that is shorted to ground
4. This step tests the KS for proper operation.
5. This step tests for a short to voltage on both the KS signal circuits.