When does the oxygen sensor heat up, and what damage does the oxygen sensor heating failure do to th

Oxygen sensor heating failure" can lead to:

Increased air intake.

The temperature of the intake air is reduced.

flammable ratio, oxygen content is reduced.

The concentration of oxygen in the exhaust gas emission is reduced, and the exhaust gas purification is not up to standard.

Increased fuel consumption.

Failure phenomena such as unstable idling, lack of fire, and wheezing.

How the lambda sensor works.

It is a measuring element that uses a ceramic sensitive element to measure the oxygen potential in the exhaust pipe of the automobile, and calculates the corresponding oxygen concentration by the principle of chemical equilibrium, so as to monitor and control the combustion air-fuel ratio to ensure product quality and exhaust emission standards. It has the advantages of simple structure, quick response, easy maintenance, convenient use and accurate measurement.

Oxygen sensors are an essential element in engines that use three-way catalytic converters to reduce exhaust pollution. As the air-fuel ratio of the mixture once deviates from the theoretical air-fuel ratio.

The purification capacity of the three-way catalyst for CO, HC and NOx will be drastically reduced, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture around the theoretical value.

The function of the oxygen sensor is to detect the oxygen content in the exhaust gas discharged by the engine, so as to control the ratio of air and fuel of the engine mixture, to put it bluntly, the signal of the detected oxygen content is sent to the control computer of the engine, so that the computer controls the amount of fuel injected by the injector, so as to control the mixture near the theoretical air-fuel ratio, so that the three-way catalytic purification device in the exhaust pipe, The combustion exhaust gas can be converted into carbon dioxide, water and nitrogen with maximum efficiency, thereby reducing environmental pollution. In order to reduce the fuel consumption and air pollution when the engine is idling, heat the oxygen sensor to make it reach the working state in advance, and after the engine temperature reaches the normal working temperature, the oxygen sensor also reaches more than 300 degrees at the exhaust gas temperature, so that the oxygen sensor does not need to be heated at this timeBecause the exhaust gas temperature is enough to maintain the temperature of the oxygen sensor above 300 degrees, then the computer will turn off the oxygen sensor plus the ** circuit.

Oxygen sensorIt is also heated to 300 degrees.

The standard operating temperature of the oxygen sensor is 300 degrees, and the operating temperature is 300 degrees to 900 degrees. The oxygen sensor cannot work without heating, and the heating resistance is 3 to 50 ohms. The oxygen transmission ground wire is not necessarily 0V, it depends on the internal circuit, as long as the signal line has up and down changes, and the oxygen sensor also has to jump when idling.

There is a ** ring inside the oxygen sensor, and the oxygen sensor is limited in temperature, and the temperature is only above 300 degrees to work normally. If there is no ** ring, then the sensor can only work after the exhaust temperature reaches this value, so the sensor can enter the work in advance with the ** ring, and the computer will use the oxygen sensor feedback signal to accurately inject fuel earlier.

Precautions for the use of oxygen sensors.

In the analysis of oxygen content, especially trace oxygen analysis, because the oxygen content in the air is as high as 21% O2, it is easy to pollute and interfere with the sample if it is not handled properly, and the analysis results are incorrect. The main reason for this is improper operation of the oxygen sensor.

When reusing the oxygen sensor, it is necessary to pay attention to whether there is air leakage when connecting the sampling line, and it is necessary to carefully blow out the leaked air front air to prolong the life of the sensor by not allowing a large amount of oxygen to pass through the sensor. In the process of purification of the pipeline system, in order to shorten the purification time, there is a need for a certain method, which generally uses high-pressure degassing and small flow blowing alternately to quickly purify the pipeline.

Summary. Once the relay is found. Unplug the relay.

Measure the voltage of the relay on all 4 pins. Pin 30 is 12v normal. Foot 86 also has 12v normal.

The power test light can be lit. Pin 87 and the oxygen sensor plug are on. Ohmic resistance.

Foot 85 is grounded normally. Determine the fault of the relay. After the relay contacts are sanded.

Read the fault code again. The lap fault has disappeared. The front oxygen sensor failure also disappeared.

Troubleshooting. But there is a new glitch. The rear oxygen sensor control circuit is faulty.

First of all, we can read the normal voltage bounce of the oxygen sensor 1 above the data stream. The signal voltage of the oxygen sensor 2 has not moved. After judging the failure of the oxygen sensor.

After the change, the lambda sensor continues to read the data stream after it is replaced. After the fault code, the oxygen sensor data beats normally. Until the fault code has been cleared.

Troubleshoot the relay contacts. Replace the rear oxygen sensor. Troubleshooting.

The oxygen sensor heating circuit circuit is faulty.

Hello, glad to answer for you. Oxygen sensor heating circuit circuit faultOxygen sensor heating circuit circuit failureWhat to do when encountering such a fault. First of all, we can see if the data flow oxygen sensor is working.

If it doesn't work. We can unplug the sensor for measurement. Whether the heating circuit is working properly.

The 2 lines of the oxygen sensor are added ** circles. A positive pole and a negative pole are required to add ** circles. So.

We measure 4 wires. At least one of the wires is the mains voltage. The power test lamp must be lit, and none of them will be lit when measured with the test lamp.

Then we measure with a multimeter. A voltage is measured, but there is no way to light up this voltage test lamp. This voltage is the power supply.

There is a false connection, and this supply voltage comes from the relay. So we're going to find this relay to check.

Once the relay is found. Unplug the relay. Measure the voltage of the relay on all 4 pins.

Pin 30 is 12v normal. Foot 86 also has 12v normal. The power test light can be lit.

Pin 87 and the oxygen sensor plug are on. Ohmic resistance. Foot 85 is grounded normally.

Determine the fault of the relay. After the relay contacts are sanded. Read the fault code again.

The lap fault has disappeared. The front oxygen sensor failure also disappeared. Troubleshooting.

But there is a new glitch. The rear oxygen sensor control circuit is faulty. First of all, we can read the normal voltage bounce of the oxygen sensor 1 above the data stream.

The signal voltage of the oxygen sensor 2 has not moved. After judging the failure of the oxygen sensor. After the change, the lambda sensor continues to read the data stream after it is replaced.

After the fault code, the oxygen sensor data beats normally. Until the fault code has been cleared. Troubleshoot the relay contacts.

Replace the rear oxygen sensor. Troubleshooting.

The four wires of the oxygen sensor are from the engine computer board, and the ** may pass through the fuse box, and a fuse will be added in the middle.

All the normal voltages of the oxygen sensor are within the range of the state dongshan, while the general average is in. Secondly, the voltage chamber frequency of the oxygen sensor is getting faster and faster, which means that the sensor is better. If the voltage is 0V or 1V, or even does not change, it means that the oxygen sensor at this moment has already been seriously embrittle, and it must be replaced with a new one immediately.

Oxygen sensors are used to inject fibrillation filial piety matters.

Do not let the oxygen sensor collide with hard objects: because the oxygen sensor has ceramic sensitive elements, if it falls on the ground or collides with other hard objects, this violent vibration and impact may damage the ceramic element or heating element in the sensor.

Avoid pulling the sensor wire: This is the same as other electrical equipment, excessive pulling of the sensor wire may lead to unreliable connection of the sensor, which will affect the operation of the oxygen sensor.

Oxygen sensorThe normal working temperature is about 300 degrees, so the oxygen sensor cannot work normally when the cool car is just on fire. However, in order to bring the oxygen sensor to normal temperature as soon as possible, a heated sensor is now used, which automatically heats up when the car is cool, and can quickly reach the operating temperature.

The engine open-loop control and closed-loop control that everyone usually understands sounds very profound, but in fact, it is about whether the oxygen sensor is involved in the work. The participation of the aerobic sensor is called closed-loop control, and the dry response without the participation of the oxygen sensor is the open-loop control. The closed-loop control can keep the air-fuel ratio around the theoretical value, so that the gasoline can finish the lifting and combustion, so the correction effect of the oxygen sensor on the fuel is very large.

When the oxygen sensor is normal, it naturally does not affect fuel consumption.

Only if it is broken, the value is inaccurate will affect fuel consumption. The oxygen sensor is not installed on the exhaust pipe, and its function is to detect the oxygen content in the exhaust gas, so as to determine the combustion state, and then correct the amount of fuel injected. For example, if the oxygen content in the exhaust gas is too high, it means that the air-fuel ratio is incorrect, there is more air and less gasoline, and the gasoline is burned out but there is a lot of oxygen left, that is, there is too little fuel injection.

The mixture is too thin. Then the signal from the oxygen sensor is sent to the engine computer, and the engine computer will control the injection of a little more oil to achieve the best air-fuel ratio. Conversely, when the oxygen content is too low, the mixture is too concentrated, so it is necessary to reduce the amount of fuel injected and keep the mixture around the theoretical air-fuel ratio.

Therefore, when the oxygen sensor works normally, it has a positive impact on the combustion state, emissions, fuel consumption, etc.

The open circuit of the oxygen sensor heating circuit means: the open circuit is not connected, check whether the heating control circuit of the oxygen sensor is open or poorly contacted. The oxygen sensor can control the circuit at a certain temperature, just like the switch at high temperatures.

The oxygen sensor is a key sensor for electronically controlling fuel metering, and the characteristics of the oxygen sensor can only be fully reflected at high temperatures (the end reaches more than 300°C) and the output voltage can be fully reflected.

If the open circuit is not connected, check whether the heating control circuit of the oxygen sensor is open or in poor contact.

Because once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for Co, HC and NOx will decrease sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.