In life, sometimes we will encounter the situation that the car engine fault light is on. What is the reason why the car engine fault light is on? Let's take a look at the related content below.
The car's fault light is on, and this fault is accompanied by the development of automotive electronic technology. Nowadays, the car will be equipped with a micro-computer. Through the internal program management of the micro-computer, the car's electrical components begin to work in an orderly manner, once the system An abnormality occurs somewhere inside, and the computer will alarm. The form of the alarm is to light up the fault light, which is also a characteristic of the humanization and intelligence of the automobile.
It is necessary to explain that the fault light only indicates that there is an abnormality in a certain system. As for the specific fault, it needs to be interpreted by means of a computer detector. Each brand of car has its own unique fault code. Interestingly, because the computer is controlled by a fixed program, it is inevitable to "make a mistake", which is what we often say "false faults."
Because the fault lights are controlled by the microcomputer, no matter which system alarms, there is no difference in the processing method without the computer detector.
The engine fault light does not mean that the engine will not work. First of all, the fault light is on, it is necessary to check and repair. If you are near the repair station, you can check it at any time. It is better to check it immediately. If you are located far away from the repair station, it happens that there is no time to repair it. Station inspection, as long as you feel that the engine has no obvious fault, you can do your thing first.
There are only a few points to note
1. Do not drive as usual during driving, it is best to keep driving at low speed.
2. Always pay attention to whether the oil meter is alarming. If the oil is seriously missing, it is impossible to drive.
3, always pay attention to whether the water temperature gauge (antifreeze) alarm, if the water temperature is too high and driving for a long time, the car breakdown is affirmative.
The engine fault light is on, usually if there is no particularly obvious fault, it is ok to drive at a low speed. There may be some minor problems, or there may be no problems (false faults), but if the engine has obvious faults such as severe abnormal noise, severe jitter, engine smoke, etc., do not drive on the road, it is best to contact the repair shop for rescue.
Solution for engine fault indicator lightFirst of all, if the fuel quality is poor, it is recommended that the owner add some high-quality gasoline after the fuel is discharged. Although it will waste some money, it can protect the engine. It is easy to use the inferior fuel for a long time. influences.
Secondly, if it is a cold car start, it usually occurs mainly in the winter. It is recommended that the owner can start the hot car for one to two minutes at the start.
Finally, if the engine mileage is long and the vehicle is large, there is no way to solve it. The former can replace the spark plug, and the latter has no measures other than replacing the vehicle.
The possible reasons for the engine fault light are too many possibilities, which are roughly divided into the following three categories:
1. False faults. The fault code is reported, but it works normally. It may be that the operation of one time is beyond the control range of the computer. The fault code returned by the computer can be eliminated first, and then check if the fault code is still skipped.
2, glitch. There is no obvious fault in the engine. According to the computer test information and further inspection, it is found that there is a certain fault, which does not affect the normal driving or has little impact. It needs to be found in time to solve it. For example, the intake pressure sensor is faulty.
3, big failure. Such failures can be felt by the naked eye and driving experience, and seriously affect the normal operation of the engine, requiring immediate repair. For example, the engine is obviously underpowered, and it is likely to be an oxygen sensor problem.
Analysis of the cause of engine fault lightThe engine fault light is not a problem that every owner can ignore, which is directly related to engine life and driving safety. The engine fault light is usually caused by the following reasons.
It is estimated that most car owners have this experience. Soon after the car is finished with oil, the engine fault light is on the dashboard of the car; this is generally because the poor quality gasoline is added to the non-standard gas station, resulting in oil and gas during engine operation. The mixture is not fully burned and the engine fault light is on. This will not affect driving safety, but it will cause more or less damage to the engine.
Today, there are two oxygen sensors installed in the car, one for each of the three-way catalytic converter. The function of the front oxygen sensor is to detect the air-fuel ratio of different operating conditions of the engine, and the ECU computer adjusts the fuel injection amount and calculates the ignition time according to the signal. The main thing behind is to check the working of the three-way catalytic converter! Therefore, if the oxygen sensor is damaged or the sensor plug is damaged or loose, the mixture may be too thin or too rich, causing the fault light to illuminate.
In fact, the oxygen sensor is a fairly durable component that can be used for 3 years or longer as long as the fuel quality is critical. Therefore, the fault light of the new car is bright, you may wish to check if the oxygen sensor plug is loose.
The air flow sensor, also known as the air flow meter, detects the amount of air sucked and converts it into an electrical signal and transmits it to the electronic control unit ECU. Indirectly, the ECU determines how much fuel is discharged according to the optimal air-fuel ratio. If the air flow sensor or line fails, the ECU will not get the correct intake air quantity signal, and normal fuel quantity control will not be performed, resulting in the mixture being too lean or too rich and the engine not working properly.
Although the air flow sensor malfunction does not cause the engine to start, it is highly probable that the idle speed is unstable, the acceleration is poor, the intake pipe is tempered, and the exhaust pipe emits black smoke.
The uneven quality of fuel on the market and the congested urban traffic make car spark plugs prone to carbon deposits. The spark plug carbon deposits can cause poor engine operation, difficulty in starting, unstable idle speed, poor acceleration, rapid fueling and tempering, excessive exhaust gas, Abnormal phenomena such as increased fuel consumption.
When the engine draws in the oil and gas mixture, factors other than various controls have not yet reached the expected ignition position during the compression stroke, causing the oil and gas mixture to self-ignite and burn. At this time, the huge impact force generated by the combustion is opposite to the direction of the piston movement, causing the engine to vibrate. This phenomenon is called knocking. The performance is that the car is running weak, the engine noise is too large, and when it is serious, it is accompanied by a knocking sound.
There is a thermistor inside the water temperature sensor. The lower the temperature, the higher the resistance, and the higher the temperature, the lower the resistance. When the engine water temperature is low, the water temperature information of the water temperature sensor of the water temperature meter increases the air-fuel ratio to make the engine work stable. If the water temperature sensor does not generate the cold state information, the air-fuel ratio will be thinned, resulting in the engine. The operation is not normal. Similarly, if the cold machine information is sent after warming up, the air-fuel ratio will be enriched and the engine will not work properly.
Obviously, after the engine is out of the cylinder, the car will consume a lot of fuel, black smoke, the car accelerates, the jitter is serious, the engine noise will increase, and the vehicle is also prone to flameout. The engine cylinder shortage mainly comes from the ignition system and the fuel supply system, including the spark plug carbon deposit and the high pressure oil pump damage.
In any case, the engine fault light is on, you need to use a computer tester for diagnosis. If it is a fake fault code, it can be cleared directly. If there is a fault, it needs to be checked and repaired according to the fault code. If only the engine fault light is on, the car is driving normally, there is no obvious abnormality, you can continue driving, have time to check it at 4S shop; if the water temperature is too high or the oil pressure warning light is also on, you can obviously feel the fault exists, or get off Call for help.
Not all engine fault lights can't be turned on. If the engine fault light is on, there is no abnormal noise in the engine room, the instrument has no other abnormal indications, the vehicle power is not affected, the gearbox upshift has no effect, you can continue to drive the 4S shop for further investigation, because Exhaust gas, etc. may cause the engine fault light to illuminate, and the specific problem is analyzed in detail.
This so-called yellow engine fault light, also known as the EFI system fault light. As long as there is no special abnormality in engine power and sound, you can continue to drive. Because there is a program that replaces the error in the ECU. Once there is a sensor fault in one of the many sensors, in order to ensure the normal operation of the engine, the ECU will replace the parameters of the fault sensor according to the preset backup parameters to avoid vehicle breakdown. For example, if the water temperature sensor is broken, the ECU uses the 80 degree backup value as the control parameter for fuel injection and ignition. Therefore, it can be opened, but it must be repaired in time.
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