Circuit Description

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The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The KS produces an AC signal that varies at all engine speeds and loads. The ECM makes adjustments to the spark timing based on the amplitude and frequency of the KS signal. The ECM receives the KS signal through a signal circuit. The KS ground is supplied by the ECM through a low reference circuit. The ECM uses the KS to calculate the amount of normal engine noise (a noise channel) for a wide range of engine speeds and loads. The ECM compares the actual KS signal to the learned noise channel. The ECM uses the noise channel in order to diagnose the KS and the related wiring. If the ECM detects a loss of the noise channel, a DTC will set. DTC P0325 refers to the bank 1 sensor. DTC P0330 refers to the bank 2 sensor.