1, by the voltage signal diagnosis. Before testing the oxygen sensor, the engine must be within the normal operating temperature range.
As for the diagnostic method, I will not repeat it here. I believe we are already familiar with it. When the engine idles and the temperature is normal, if the air-fuel ratio deviates slightly from the stoichiometric air-fuel ratio, then the oxygen sensor output voltage will change from low-pressure to high-pressure cycles. The typical oxygen sensor output voltage changes from a period of 0.3V to 0.8V.
2. Some advices when measuring.
A- The oxygen sensor must be tested with a digital voltmeter. Many data have shown that using other types of low-impedance multimeters will damage the oxygen sensor. However, in actual work, I mentioned that the use of digital meters is not based on information. But for practical work needs.
As we all know, the precise indication range of the analog multimeter is in the middle of its dial, but the voltage signal range of the oxygen sensor that we tested is exactly the opposite of the precision indication range of the analog multimeter. Its maximum value and minimum value are in the multimeter. The two ends, so that if you use an analog multimeter to test the voltage signal of the oxygen sensor is simply not accurate, this is why I use the number is a multimeter.
B-If the oxygen sensor in the exhaust pipe is contaminated and cannot come into contact with oxygen, it may give a continuous high voltage signal C - Sealant should be used as little as possible when replacing the oxygen sensor, for the reason that if an excessive seal is applied The sealant will burn due to high temperatures while the engine is working. The burning waste of the sealant will cause your newly replaced oxygen sensor to quickly age and fail in a relatively short period of time, but you can't find out where the problem is.
3. During measurement, A- If the voltmeter continues to read high voltage, it indicates that the air-fuel ratio may be too rich, or the sensor is contaminated. The B-voltmeter reading continues to low voltage, indicating that the air-fuel ratio may be too high or sensor failure. C- If the oxygen sensor voltage signal remains at an intermediate value, the computer circuit may be broken or the sensor may be damaged.
4. Some notes on the oxygen sensor voltage signal:
In most cases, when we conduct oxygen sensor testing, our maintenance personnel will let the engine work in advance for a few minutes to ten minutes, let the engine enter the closed-loop working state, measure whether the voltage signal output by the oxygen sensor changes between high and low, There is nothing wrong with this, but can you say why you would like to do this? I have met many repair engineers in their understanding that the oxygen sensor will generate a changing voltage signal as the operating temperature of the engine increases. If the output voltage signal remains basically constant, it is a basically stable constant value. The oxygen sensor is damaged. In fact, this is a mistaken understanding of oxygen sensors. In fact, the change in the voltage signal of the oxygen sensor is determined by the change in the oxygen content in the exhaust gas emitted by the engine. The size of the engine load and the different operating conditions directly lead to different oxygen levels in the exhaust gas of the engine. With the change of the oxygen content, the voltage signal of the oxygen sensor naturally changes. Therefore, the change of the oxygen sensor voltage signal is affected by the operating conditions of the engine. Try to think about what happens to the oxygen sensor if the engine is always in a rich state for some reason, or if the mixture is too busy. There are two answers - (1) Always output a high voltage signal, (2) Always output a low voltage signal, but this does not indicate that the oxygen sensor is damaged.
5. Errors in Diagnostic Ideas In the actual maintenance work, the engine is in poor working condition. For example, if the engine is in unstable condition, such as idle speed instability, idle engine black smoke, and insufficient power, etc., during the inspection process, we will read. The fault code of the engine control computer sometimes has information that the oxygen sensor has been damaged. We have performed clear code, randomly read the current fault code after a period of road tests, and find that other fault codes do not appear but the oxygen sensor The damaged fault message still exists, and then the performance of the oxygen sensor is tested, confirming that it is really damaged and will be replaced without hesitation.
As for the diagnostic method, I will not repeat it here. I believe we are already familiar with it. When the engine idles and the temperature is normal, if the air-fuel ratio deviates slightly from the stoichiometric air-fuel ratio, then the oxygen sensor output voltage will change from low-pressure to high-pressure cycles. The typical oxygen sensor output voltage changes from a period of 0.3V to 0.8V.
2. Some advices when measuring.
A- The oxygen sensor must be tested with a digital voltmeter. Many data have shown that using other types of low-impedance multimeters will damage the oxygen sensor. However, in actual work, I mentioned that the use of digital meters is not based on information. But for practical work needs.
As we all know, the precise indication range of the analog multimeter is in the middle of its dial, but the voltage signal range of the oxygen sensor that we tested is exactly the opposite of the precision indication range of the analog multimeter. Its maximum value and minimum value are in the multimeter. The two ends, so that if you use an analog multimeter to test the voltage signal of the oxygen sensor is simply not accurate, this is why I use the number is a multimeter.
B-If the oxygen sensor in the exhaust pipe is contaminated and cannot come into contact with oxygen, it may give a continuous high voltage signal C - Sealant should be used as little as possible when replacing the oxygen sensor, for the reason that if an excessive seal is applied The sealant will burn due to high temperatures while the engine is working. The burning waste of the sealant will cause your newly replaced oxygen sensor to quickly age and fail in a relatively short period of time, but you can't find out where the problem is.
3. During measurement, A- If the voltmeter continues to read high voltage, it indicates that the air-fuel ratio may be too rich, or the sensor is contaminated. The B-voltmeter reading continues to low voltage, indicating that the air-fuel ratio may be too high or sensor failure. C- If the oxygen sensor voltage signal remains at an intermediate value, the computer circuit may be broken or the sensor may be damaged.
4. Some notes on the oxygen sensor voltage signal:
In most cases, when we conduct oxygen sensor testing, our maintenance personnel will let the engine work in advance for a few minutes to ten minutes, let the engine enter the closed-loop working state, measure whether the voltage signal output by the oxygen sensor changes between high and low, There is nothing wrong with this, but can you say why you would like to do this? I have met many repair engineers in their understanding that the oxygen sensor will generate a changing voltage signal as the operating temperature of the engine increases. If the output voltage signal remains basically constant, it is a basically stable constant value. The oxygen sensor is damaged. In fact, this is a mistaken understanding of oxygen sensors. In fact, the change in the voltage signal of the oxygen sensor is determined by the change in the oxygen content in the exhaust gas emitted by the engine. The size of the engine load and the different operating conditions directly lead to different oxygen levels in the exhaust gas of the engine. With the change of the oxygen content, the voltage signal of the oxygen sensor naturally changes. Therefore, the change of the oxygen sensor voltage signal is affected by the operating conditions of the engine. Try to think about what happens to the oxygen sensor if the engine is always in a rich state for some reason, or if the mixture is too busy. There are two answers - (1) Always output a high voltage signal, (2) Always output a low voltage signal, but this does not indicate that the oxygen sensor is damaged.
5. Errors in Diagnostic Ideas In the actual maintenance work, the engine is in poor working condition. For example, if the engine is in unstable condition, such as idle speed instability, idle engine black smoke, and insufficient power, etc., during the inspection process, we will read. The fault code of the engine control computer sometimes has information that the oxygen sensor has been damaged. We have performed clear code, randomly read the current fault code after a period of road tests, and find that other fault codes do not appear but the oxygen sensor The damaged fault message still exists, and then the performance of the oxygen sensor is tested, confirming that it is really damaged and will be replaced without hesitation.
Stainless Steel Manual Chicken Saline Injection Machine Saline Injection Machine Price
1. The fully automatic saline brine injection machine can evenly inject the pickling solution prepared with brine and auxiliary materials into the meat, which not only shortens the pickling time, but also makes the pickling agent evenly distributed, greatly improving the taste and yield of meat products.
2. This meat saline injection is easy to clean and has a reasonable structure. The whole machine is made of 304 stainless steel and is clean and hygienic. It is an indispensable equipment in the meat industry.
3. According to different technological requirements, the stepping speed, the stepping distance, the gap between the pressing plate and the injection pressure can be adjusted to inject the pickling liquid evenly and continuously into the meat to achieve the ideal injection effect.
Saline Injection Machine, Brine Injection Machine, Salt Brine Injection Machine
Henan Gems Machinery Co.,Ltd , https://www.gemsmachines.com