October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Vehicle Speed Sensor (VSS)

ECM supplies voltage to one side of a reed switch located in speedometer. Speedometer cable revolution opens and closes reed switch, providing ECM with continuity/no continuity input. ECM interprets this signal as vehicle speed.