ECT stands for Engine Coolant Temperature, it is a sensor, it is on the black metal tube parallel wih the intake, it works off voltage, I believe 0-1 volt, for instance if the sensor is producing a voltage to the computer of say .35 volts the car is still relatively cool as the coolant temperature rises so does the voltage, and so on.
These sensors FORD uses are of military quality and have been tested to even work under water, my advice is replace ALL the sensors on the car, especally O2's and TPS, I say this because I work in a racing environment and when we have electrical problems we replace all sensors to eliminate any guesswork, this may not be practical in your case.
Replace the ECT and the ACT (Air charge temperature), there cheap.
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