Engine Coolant Temperature (ECT) Sensor - V8

ECT sensor is located on engine coolant outlet duct. The ECT sensor is a Negative Thermal Coefficient (NTC) thermistor. Electrical resistance within ECT sensor increases as coolant temperature decreases.

ECM or PCM monitors ECT sensor resistance value and triggers temperature enrichment circuits (when necessary) to extend injector "on" time during cold starting and warm-up.