Knock Sensor

The knock sensor detects abnormal vibration (spark knocking) in the engine. The knock sensor produces an AC voltage signal under all engine operating conditions. The PCM adjusts the Ignition Control (IC) spark timing based on the amplitude and frequency of the KS signal being received.

The PCM contains integrated knock Sensor (KS) diagnostic Circuitry. The PCM uses the circuitry to diagnose the KS sensor and related wiring. During normal operation the PCM calculates the average voltage of the knock sensor signal. If the knock sensor system is operating normally, the PCM should monitor KS signal voltage varying over 0.5 volt above and below the calculated average voltage. If the PCM malfunctions in a manner which will not allow proper diagnosis of the KS circuit DTC 325 will set.

DTCs P0327 applies to the knock sensor and related wiring.

Refer to Knock Sensor System Description for a complete description of the knock sensor system.