Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The engine coolant temperature (ECT) detects the temperature of the engine coolant and supplies the information to the PCM. The PCM uses the ECT sensor to control TCC operation.