P0327

DTC P0327 or P0332

CIRCUIT DESCRIPTION
The knock sensors (KS) produce an AC signal when specific frequencies are detected. When the engine operates, the powertrain control module (PCM) learns a minimum and maximum frequency of noise of normal engine operation. The KS System monitors both knock sensors in order to determine if knock is present. If the KS System determines that excessive knock is present, the PCM retards the spark timing based on the signals from the KS system. The PCM then retards the timing until no knock is present. When the PCM detects a frequency that is less than or more than a defined range, DTC P0327 will set for a failure in KS 1 which is located on bank 1 on the drivers side of the engine or DTC P0332 will set for a failure in KS 2 which is located on bank 2 on the passenger side of the engine.

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 P0106, P0107, P0108, P0116, P0117, P0118, P0125, P1114, or P1115 are not set.
- The engine speed is between 1,600-3,000 RPM.
- The manifold absolute pressure (MAP) is less than 45 kPa.
- The engine coolant temperature (ECT) is more than 60°C (140°F).
- The engine run time is more than 20 seconds.
- The ignition more than 10 volts.
- This diagnostic runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The PCM determines that this frequency is less than or more than the expected amount for 3 seconds or more.

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 proper installation. A KS that is loose or over torqued may cause either DTC to set.

For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

TEST DESCRIPTION

Step 1 - Step 8:

Step 9 - Step 10:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies the malfunction is present.
3. This test will isolate the KS from the rest of the circuit.
4. Tapping on the engine block near the appropriate KS will simulate an engine knock.