Note. For circuit reference, see WIRING DIAGRAMS article.
Circuit Description
The Knock Sensor (KS) produces an AC voltage at all engine speeds and loads. PCM adjusts the spark timing based on the amplitude and frequency of KS signal. The PCM uses the KS signal in order to calculate the average voltage, then PCM assigns a voltage value. The PCM checks the knock sensor and the related wiring by comparing actual knock signal to the assigned voltage range. A normal KS signal should stay within the assigned voltage range. This DTC will set if KS signal is outside the assigned voltage range or if signal is not present.