Engine Coolant Temperature Sensor

Engine Coolant Temperature (ECT) sensor is a thermistor whose resistance decreases as engine coolant temperature increases. ECM uses ECT sensor information for controlling fuel enrichment when engine is cold. ECT sensor is located near thermostat housing on Optima & Magentis (Canadian) (2.4L), Rio and Spectra. ECT sensor is located on coolant crossover passage at rear of cylinder heads on Optima & Magentis (Canadian) (2.7L) and Sedona. ECT sensor is located on water passage near front of right cylinder head on Sorento.