Hyundai Elantra HD: Engine Coolant Temperature Sensor (ECTS). Description and Operation
Function And Operation Principle
Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant
passage of the cylinder head for detecting the engine coolant temperature. The
ECTS uses a thermistor whose resistance changes with the temperature. The electrical
resistance of the ECTS decreases as the temperature increases, and increases
as the temperature decreases. The reference 5 V in the PCM is supplied to the
ECTS via a resistor in the PCM.That is, the resistor in the PCM and the thermistor
in the ECTS are connected in series. When the resistance value of the thermistor
in the ECTS changes according to the engine coolant temperature, the output
voltage also changes. During cold engine operation the PCM increases the fuel
injection duration and controls the ignition timing using the information of
engine coolant temperature to avoid engine stalling and improve drivability.
