Description And Operation: Description
- Water temperature sensor (WTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature.
- The WTS uses a thermistor whose resistance changes with the temperature.
- The electrical resistance of the WTS decreases as the temperature increases, and increases as the temperature decreases.
- The reference +5V is supplied to the WTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the WTS are connected in series.
- When the resistance value of the thermistor in the WTS 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.