Knock Sensor (KS)

The knock sensor detects abnormal vibration or 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 the frequency of the KS signal being received.

The PCM contains integrated KS diagnostic circuitry. The PCM uses the circuitry to diagnose the KS and the 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 a KS signal voltage varying over 0.5 volt more than and less than the calculated average voltage. If the PCM malfunctions in a manner which will not allow a correct diagnosis of the KS circuit, a DTC 325 will set.

DTC P0327 applies to the knock sensor and related wiring.

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