P0332

Electrical Diagram:

CIRCUIT DESCRIPTION

The Knock Sensor (KS) system detects engine detonation. The PCM retards the spark timing based on the signals from the knock sensors. The knock sensors produce an AC voltage. The knock sensor voltages are an input to the PCM. The amount of AC voltage produced is proportional to the amount of knock.

An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors produce an AC voltage signal from this noise. When an engine operates, the PCM learns the minimum and maximum frequency of the noise the engine produces. When the PCM determines that this frequency is less than or greater than the expected amount, a knock sensor DTC will set.


CONDITIONS FOR SETTING THE DTC

^ Engine operating greater than 20 seconds.

^ ECT is greater than 70°C (158°F).

^ Engine speed is between 1500 and 3500 RPM.

^ Throttle angle is greater than 20%.

^ MAP is less than 60 kPa.

^ System voltage is greater than 10 volts.

^ The PCM determines that this frequency is less than or greater than the expected amount for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp on the second consecutive drive trip that the diagnostic runs and fails.

^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive drive trip, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.


CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

^ A last test failed (current DTC) clears when the diagnostic runs and does not fail.

^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.


DIAGNOSTIC AIDS

Check the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause the DTC P0332 to set.

For an intermittent, refer to Symptoms. Testing and Inspection

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. This verifies the malfunction is present. The scan tool will display DTC Ran=Yes and Pass--Int if the failure is intermittent. This indicates the diagnostic passed this ignition cycle and failed this ignition cycle. At this point the resistance of the knock sensors should be verified to be in the correct range. If the knock sensor resistances are correct, check the KS system wiring connections. When checking the KS system connections, start at the KS system jumper harness connector located behind the intake manifold. Then check the connections at the PCM. Refer to the wiring schematic for the correct connector and terminal. Then check the connections at the appropriate knock sensor. Failure Records data does not include the parameter KS Activity, however other parameters may aid in locating the conditions under which an intermittent occurred.

3. This test will isolate the Knock Sensor from the rest of the circuit.

4. Tap on the engine block just below the intake manifold between the timing chain cover and the valley cover.