Where is the outdoor water temperature sensor of Jianghuai He Yue installed?

The water temperature sensor is installed on the waterway and water tank of the car, the old Honda is installed under the distributor, and the temperature control switch is installed on the waterway.

The function of the first water temperature sensor is relatively simple, that is, through the change of its internal resistance, the current passing through the sensor changes to drive the change of the water temperature meter, and indirectly tell people the working temperature of the engine. Secondly, the water temperature sensor has no change in structure, but its function is to provide an analog signal of temperature change to the engine control unit. Its power supply voltage is 5V provided by the control unit, and the signal returned to the control unit is a linear change signal of1.3v-3.8V. Its main function is to tell the engine control unit the current temperature. On the contrary, its signal is very important to the control unit. The main reason is that the engine works in different ways at different working temperatures. For example, if the engine is below 86 degrees, it needs to inject more fuel 10% than the normal temperature, so that the engine can warm up quickly and reduce the low-temperature wear of the engine. When the temperature rises above 86 degrees, the engine should be sprayed with less oil and the temperature should be regenerated slowly. So its role is very important. If something goes wrong with him and gives the wrong signal to the engine control unit, for example, when the car is hot, does your car need to spray more oil, so it looks a little waste oil?

However, the working voltage conditions of these two water temperature sensors are different. The sensor of the water temperature meter is 12V, while the sensor of the engine control unit is 5V, so they are not interchangeable. In addition, their plugs have different shapes.

It's easy to distinguish them. The former has only one wire in the plug, while the latter has two wires in the plug of the engine control unit. Let's not make mistakes.