Strictly speaking, water temperature sensors are divided into two categories. Either way, its internal structure is a thermistor, and the resistance value is between 275 ohms and 6500 ohms. And the lower the temperature, the higher the resistance, and the higher the temperature, the lower the resistance.
The water temperature sensor is also an electronic component on the automobile circuit. If it is broken, there is basically no room for repair, only replacement. Then how to judge whether the water temperature sensor is broken? The simplest thing is to use a multimeter and then heat the water temperature sensor with a hair dryer. If the resistance value does not change, it means that the water temperature sensor is broken.
The fault symptoms of the water temperature sensor are as follows:
1. The pointer of the thermometer does not move, pointing to the highest position.
2. It is difficult to start the cold car, because the water temperature sensor is faulty, and the hot car temperature signal is also displayed when the cold car is started. ECU can't get the signal of too rich mixture, and can only provide the engine with a thinner mixture.
3. Increased fuel consumption and unstable idle speed; It is difficult to accelerate, and the engine speed can't go up when the accelerator is pressed to the bottom.
(Photo/Text/Photo: Li Xiongwei) @20 19