What is the phenomenon that the automobile water temperature sensor is broken?

First, the phenomenon caused by the failure of the automobile water temperature sensor

1, some cars can't speed up, even if you step on the accelerator, it's hard for the transmitter to speed up.

2. Some cars can only be used normally if the fault light is always on or accompanied by alarm sound.

Second, principles.

According to this change, the electronic control unit measures the temperature of engine cooling water. The lower the temperature, the greater the resistance. On the contrary, the smaller the resistance. According to this change, the electronic control unit measures the temperature of engine cooling water as the correction number of fuel injection and ignition timing. Simply put, we can know the current running state by the temperature of the engine water temperature, whether it is stopped or moved, or how long it has been moving.

Third, the structure

The structural automobile water temperature sensor is installed on the water jacket of the engine cylinder block or cylinder head, which is in direct contact with the coolant and is used to measure the coolant temperature of the engine. The temperature sensor used in the coolant thermometer is negative temperature coefficient (NTC), whose resistance decreases with the increase of temperature, and a wire is connected to ECU. The other is the ground wire, as shown in the figure.