How to detect the quality of the water temperature sensor?

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Measurement method: use the multimeter resistance file measurement, some are two-wire, directly positive and negative meter pen to connect two pins, three-wire is generally a triangle pin or a word pin, the triangle pin of the bottom of the two pins, the word of the pin on the edge of the two feet, the triangle of the top angle and the middle pin of the word is generally connected to the car instrument.

What the water temperature sensor does:

1. Correct the amount of fuel injected. Increase the amount of fuel injected when the temperature is low.

2. Correct the ignition advance angle; At low temperatures, the ignition advance angle is increased, and at high temperatures, it is postponed to prevent deflagration.

3. Affect the idle control valve. At low temperatures, the ECU controls the action of the idle control valve based on the water temperature sensing signal to increase the speed.

4. Affect the EGR valve.

How do I check the water temperature sensor?

Symptoms of a broken water temperature sensor: The vehicle's water temperature gauge is abnormal, the vehicle is unstable at idling, and the vehicle is unable to accelerate.

1. The water temperature sensor of the vehicle is faulty, and its most obvious manifestation is that the water temperature gauge of the vehicle is abnormal, and the pointer of the water temperature gauge has not moved, and the low temperature state for a long time may also be in a high temperature state, but the vehicle has no abnormal phenomenon.

2. If the water temperature sensor of the vehicle fails, it will also make the vehicle idle unstable, because when the water temperature sensor fails, it will not be able to sense the transmission signal of the mixed gas, and the mixed gas cannot be supplied to the engine, which affects the stability of the engine.

3. If the water temperature sensor of the vehicle fails, the vehicle will have weak acceleration, and it will also affect the fuel injection of the engine, thereby increasing the fuel consumption of the vehicle.

Effect on the car:

If the water temperature sensor is broken, it will affect the normal operation of the vehicle. At this point, the car's water temperature gauge indicator is stationary and points to the highest position. In addition, it is very difficult to start the cold car, because the temperature signal of the cold car is displayed when the cold car is started after the water temperature sensor is damaged, and the electronic control unit cannot receive the electrical signal of the overly concentrated gas mixture at this time, but can only provide the engine with a relatively sparse gas mixture.

Damaged water temperature sensors can also lead to increased fuel consumption and erratic idling of the vehicle. It is difficult for the car to accelerate when it wants to, and the engine speed cannot be increased even when the driver presses the accelerator pedal all the way.

1.Comparing the data read out by the computer with the actual temperature, for example, the water temperature is high but the temperature data is low, this is generally broken. 2.

It can also measure sensor resistance and voltage, and the water temperature sensor used in the car is generally a variable resistance with a negative temperature coefficient. Cold car, the temperature is 20 degrees lower, the resistance is 20 thousand ohms higher, and the voltage is 4 volts higher. Hot car, the temperature is 95 degrees high, the resistance value is 200 ohms low, the voltage is low, the general cooling fan will rotate, the above data is generally around, according to the model age is not the same.

3.It can be removed, do not pull out the wire, keep heating, the cooling fan turns on behalf of normal, does not turn on behalf of damage, and the hot car must be disassembled by opening the water tank cover to relieve pressure. 4. Measure the voltage and compare the computer data.

Recommendation 4, accurate and convenient.

How do I check the water temperature sensor?

As long as the end of the sensor is placed in a cup of water with different heats, you can know a thing or two by observing the change of its output.

Here's how to judge whether a temperature sensor is good or bad:1. If there is a meter, you can connect the sensor to the meter, put the sensor into the ice-water mixture, and see if the display of the meter is not 0 degrees Celsius, and whether the reading changes.

2. If there is no table, consider the temperature measurement range of the sensor, you can look at the temperature measurement of the platinum resistance three-wire system.

3. Put the sensor into the ice-water mixture, measure the resistance with a multimeter, and the platinum resistance is just a few typical values, pt100, pt1000, pt200, and the reading value in the ice-water mixture is 100 ohms, 1000 ohms, and 200 ohms.

4. Hold the sensor in your hand, and the reading will change accordingly, and the change amplitude will be consistent.

The role of the temperature sensor1. Temperature sensor sensing applicationThe thermal conversion method of temperature sensors is often used to measure physical quantities.

2. Temperature sensor biomedical applicationBiomedical application must use special temperature sensor.

3. Temperature sensors: thermistors for space applications and silicon PN junctions have been used for space temperature measurement.

If the water temperature sensor fails, it will lead to the car having difficulty starting, weak acceleration, water temperature gauge alarm and other phenomena, after the water temperature sensor fails, it will affect the power output of the engine.

Water temperature sensor detection method: when the engine water temperature is low, the water temperature sensor of the water temperature meter transmits the water temperature information of the ECU to make the air-fuel ratio thicker, so that the engine works stably, if the water temperature sensor does not occur at this time the cold engine state information, the air-fuel ratio will be thinned, resulting in abnormal engine operation. Similarly, if a cool-up message is sent after warm-up, the air-fuel ratio will become thicker and the engine will not work properly.

When the water temperature sensor fails, the temperature signal of the hot car is often displayed when the cold car starts, and the ECU cannot get the signal of providing an over-concentrated mixture, so it can only supply the thinner mixture of the engine (the signal when the car is hot), so the engine is not easy to start when the cold car is cold. In this case, it is necessary to check whether the water temperature sensor plug contact is normal or replace the water temperature sensor.

The impact of the damage of the water temperature sensor on the car: when the water temperature of the engine is low, the water temperature sensor of the water temperature meter transmits the water temperature information of the ECU to make the air-fuel ratio thicker, so that the engine works stably. If a cool-up message is sent after warm-up, the air-fuel ratio will become thicker, and the engine will not work properly.

How do I check the water temperature sensor?

At present, the water temperature sensor on the car is basically two wires, one is the 5V power line of the computer, and the other is the signal feedback line, and the internal chip of the computer senses the change of the resistance of the water temperature sensor, which is used to accurately control the fuel injection.