DTC P0327: Knock Sensor Circuit - No Activity: Description

The PCM contains integrated Knock Sensor (KS) diagnostic circuitry. An input signal from KS is used to detect engine detonation, allowing PCM to retard Ignition Control (IC) spark timing based on amplitude and frequency of KS signal being received. The KS produces an AC signal under all engine operating conditions. During engine operation, PCM calculates average voltage of KS signal. If knock sensor system is operating normally, PCM will see KS signal voltage vary at greater than or less than the calculated voltage average. If PCM detects KS input signal equal to the KS average voltage for longer than 95 percent of calibrated time, DTC will set.