What is the function of the coolant temperature sensor?

[OKaylee]

The functions of the coolant temperature sensor are: 1. It is used to detect the temperature of the engine coolant and transmit this signal to the electronic control unit of the engine; 2. Based on this signal, it adjusts the injection time, ignition timing, and idle speed accordingly, and it can also serve as a control signal for other systems. The impacts of a faulty coolant temperature sensor are: 1. When the coolant temperature sensor malfunctions, a fault memory will be generated, and the engine cannot accurately calculate the fuel injection quantity; 2. The engine cannot accurately calculate the theoretical idle speed, leading to unstable engine idle; 3. When the engine coolant temperature sensor experiences an open circuit or short circuit fault, the electric fan will rotate at high speed.