Working principle of car water temperature sensor plug
The operating principle of the automotive water temperature sensor is based on changes in the thermistor. At low temperature, the resistance value of the thermistor is larger; With the increase of temperature, the resistance value decreases gradually. The electronic control unit (ECU) calculates the actual temperature of the coolant by measuring the voltage change in the sensor output. This temperature information is used to adjust the fuel injection amount, ignition timing and other parameters to ensure that the engine can maintain the best working condition at different temperatures to improve fuel economy and power performance.
The role of the car water temperature sensor in the vehicle includes:
Engine control : According to the temperature information provided by the water temperature sensor, the ECU adjusts the fuel injection amount, ignition time and other parameters to ensure that the engine can maintain the best working condition at different temperatures.
Cooling system control : when the water temperature is too high, the ECU will control the fan to run at high speed to enhance heat dissipation; When the water temperature is too low, reduce the fan operation to heat up the engine as soon as possible.
dashboard display : The signal from the water temperature sensor is transmitted to the water temperature gauge on the dashboard, allowing the driver to intuitively understand the engine temperature.
fault diagnosis : If the water temperature sensor fails, the ECU records the relevant fault code to help maintenance personnel quickly locate and resolve the problem.
Common fault types and symptoms include:
Sensor damage : In a harsh environment such as high temperature and vibration for a long time, the thermistor of the sensor may be damaged, resulting in inaccurate output signals or no signal at all.
Line fault : The line connecting the water temperature sensor to the ECU may be open, short circuit, or poor contact, affecting signal transmission.
sensor dirt or corrosion : Impurities and dirt in the coolant may adhere to the sensor surface, or the corrosion of the coolant may degrade the sensor performance.
Troubleshooting methods include reading the fault code and using the vehicle diagnostics to connect the OBD interface of the vehicle for detection in order to quickly locate and resolve the problem.
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