Principle of adding iron wire at high water temperature

Some car buyers blow air conditioning in the car, and the water temperature rises when the key is turned on or the water temperature meter is blocked, which is usually caused by the virtual connection between the water temperature meter and the ground wire of the water temperature sensor. Let's talk about the grounding mode of virtual high water temperature first, and give the best orientation map of the ground wire.

The grounding point of the water temperature meter is on the window frame, the grounding point of the water temperature sensor is on the diesel engine, and the other is on the ECU_ part of the automobile engine (for details of the three lines of the water temperature sensor, one is connected to the water temperature meter and the other two are connected to the ECU_ part). The following is the circuit schematic diagram of high water temperature and quenching line.

There must be a ground wire between the car body (window frame) and the car engine. If the grounding wire is wrongly connected, the instrument panel resistance grounding device of the water temperature sensor is poor, which will lead to higher working voltage of the data signal. Then, according to the characteristics of the data signal of the water temperature sensor (the temperature rises, the resistance decreases, and the working voltage of the data signal rises), please check whether the ground wire between the automobile engine and the car body is virtually connected when the water temperature is high (the check method is to accurately measure the ground point with the current file of the digital multimeter, and if there is a working voltage difference, it means virtual connection). When the grounding point is found to be in virtual connection, clean the metal oxide on the surface and replace the new grounding wire according to the situation. After the trial operation, the water temperature cannot be too high.

In view of the false height of the vehicle, attention must be paid to the installation of grounding wire. Some car buyers installed grounding wires independently, and the vehicle caught fire. It is best to install grounding wire in a professional after-sales service shop to prevent potential safety hazards.

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