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.
ECT
Scan Tool Range
-40°C to 120°C (-40°F to 250°F): The ECT sensor is a thermistor that changes internal resistance as temperature changes. The
PCM monitors a high signal voltage when the sensor is cold (internal resistance high) and interprets that voltage as a cold engine. The voltage signal decreases as the sensor becomes warm (internal resistance decreases) and the PCM interprets the lower voltage as a warm engine.