Engine coolant sensor (ECT) how does it work?

On the wiring dirgam its shown as a variable resistor. So the computer gives it a fixed voltage and as the coolant heats up the sensor the resistance changes and this voltage increase or decrease and that voltage is read as a temp by the computer. Is this correct? This is a 2 wire sensor and if I measure across the 2 pins with an ohm meter its open shouldn't it have some reading and as I heat it up I should see a change in resistance right? or does it need to be a voltage supplied in order to work?



thanksEngine coolant sensor (ECT) how does it work?i dont think a computer is involvedEngine coolant sensor (ECT) how does it work?You are correct in how it works. Most systems work with a 5 volt reference voltage sent to the sensor. as it heats up the resistance increases and the return voltage drops. at 195 deg. most cars are at about 1.5 volts returned. Some a little more or less.

The engine cooling fan sensor is normally open then closes at 210 deg. to ground a cooling fan relay and turn on the fan. don't confuse the two circuits. Often times they are close to each other on the car.Engine coolant sensor (ECT) how does it work?Year, Mileage %26amp; Details? Are you having an Overheating Problem?

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