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. On Optima & Magentis (Canadian) (2.4L), Rio, Spectra and Sportage, ECT sensor is located near thermostat housing. On Optima & Magentis (Canadian) (2.7L) and Sedona, ECT sensor is located on coolant crossover passage, at rear of cylinder heads.