Where is the Chevrolet water temperature sensor?

The water temperature sensor is installed on the waterway and water tank of the car.

1. First, pull the wrench in front of the Chevrolet Loft engine compartment cover to open the Chevrolet Loft engine compartment cover.

2. After opening the hood of Chevrolet Lefeng engine compartment, support the hood with a bracket.

3. After opening the engine compartment cover, you can find the engine compartment water temperature sensor at the position shown in the schematic diagram of the engine compartment.

4. The position marked by the red arrow is the water temperature sensor of Chevrolet Lefeng.

Fault performance

When the water temperature sensor fails, it generally displays the temperature signal when the cold car starts, and ECU can only supply the engine with a thinner mixture (signal when the car is hot), so it is not easy to start the cold car. In this case, it is necessary to check whether the plug contact of the water temperature sensor is normal or replace the water temperature sensor.

For example, reading the data of the static engine of an automobile (cold car), the coolant temperature output by the engine ECU is 105℃, while the actual temperature (set winter temperature) of the engine is only 1℃. Obviously, the water temperature signal received by the engine ECU is wrong, indicating that there is something wrong with the water temperature sensor.

It should be noted that the sensor is an electronic component on the automobile circuit. If this device is broken, there is little room for repair, so we must replace it. If you want to test, the simple way is to heat the water temperature sensor in a heating cup (be careful not to flood the plug part) and measure it with the "resistance file" of a multimeter. When the temperature rises, the resistance should become smaller. If there is no change, it proves that this thing is broken.

If the part is tested with a scan tool, it needs to be tested when the car is cold.

The function of the water temperature sensor is to convert the cooling water temperature into an electrical signal, which is input to ECU: 1. Correct fuel injection quantity; When the temperature is low, increase the fuel injection quantity. 2。 Correct the ignition advance angle; Increase the ignition advance angle at low temperature and delay it at high temperature to prevent deflagration. 3. Affect the idle speed control valve; At low temperature, ECU controls the idle speed control valve according to the water temperature sensing signal to improve the speed.

Baidu encyclopedia-water temperature sensor

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