Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .
Circuit Description
Engine Coolant Temperature (ECT) sensor is a thermistor located in intake manifold cooling system passage used to monitor engine coolant temperature. VCM supplies 5 volts to sensor. When engine coolant is cool, sensor resistance will be high and VCM will sense a high voltage signal. When engine coolant is warm, sensor resistance will be low and VCM will sense a low voltage signal.