Engine Coolant Temperature (ECT) Sensor

The ECT contains a built-in thermistor in which resistance varies according to engine coolant temperature. The ECT delivers an input signal to THW terminal of Engine Control Module (ECM). The ECM may use input signal for controlling fuel injection system, overdrive operation on electronically controlled transmissions/transaxles, ignition timing (spark advance), idle speed control system, fuel pressure control system (if equipped), heated oxygen sensor system (if equipped) and EGR system (if equipped).