Knock Sensor: Description and Operation

The knock sensor provides an input to the Powertrain Control Module (PCM) on circuit K42. Circuit K42 connects to cavity 27 of the PCM, and cavity 2 of the sensor connector.

The PCM provides a ground for the knock sensor signal (circuit K42) through circuit K4. Circuit K4 connects to cavity 51 of the PCM connector, and splices to cavity 1 of the sensor connector.