Description And Operation: Description
- The Engine Coolant Temperature Sensor (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 Engine Control Module (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.