CTS , THw , ECT , ATS , IAT
These sensors job is to let the ECU know the temperature of various parts of the engine from the air going in ,to the coolent circulating around the engine also to turn the radiator fan on after a certin temperature so the engine wouldnt over heat. All these informations are needed to keep the engine in optimum temperature for performance and more importantly emissions.
These sensors are normaly NTC which means negative temperature co-efficient so as the temperature increases their resistance decreases so as the temprature rises so those the voltage signal back to the ECU .
For checking these type of sensor you can part of them in a bowl of water , heat the water up and check the resistance with a multimeter we can see how the resistance falls as the temperature increases .
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