Description & Operation: Description
WARNING: This page is about a different car, the 2021 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
- 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 +5V is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM 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 ECM increases the fuel injection duration and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve driveability.