Many of us have encountered such a problem as turning on the engine icon (Check engine ...), the appearance of which scares car drivers. Here are 5 of the most common reasons why dashboard check engine light comes on.
The appearance of the engine indicator icon occurs, as a rule, without warning. The reason for the appearance of the Check engine cannot be immediately understood. Even if the car has auto diagnostics (for example, in cars such as,), which scans all car systems for errors and, if any, displays a decryption on the information panel, the reasons for the appearance of an engine check will not be deciphered.
For most drivers, the appearance of this warning icon on the instrument panel means the need to urgently go to a car repair shop to diagnose and fix the cause of the "Check Engine" warning sign. But in fact, in most cases, when the "Check" indication appears, you can, and in some cases, possibly, eliminate the cause yourself without a trip to a car service, which will save you money.
The oxygen sensor in your car is part of the exhaust aftertreatment system that monitors how much oxygen has not been burned in the engine's combustion chamber. This sensor helps to control the fuel consumption of the car. A malfunctioning oxygen sensor (lambda probe) means that car computer receives incorrect data, which can significantly increase fuel consumption and reduce engine power. Most cars have 2 to 4 oxygen sensors. If you have a home automotive error scanner, then by connecting it to the car, you can easily find out which sensor needs to be replaced.
For what reason does the oxygen sensor in the car become unusable: Over time, the sensor becomes covered with a layer of used and engine oil (oil soot), which reduces the accuracy of reading the sensor readings to regulate the gasoline mixture and distribute the optimal one. A malfunction of the oxygen sensor in a car leads not only to, but also to an increased content of harmful CO2 substances in the exhaust.
What needs to be done: If you do not change a faulty car oxygen sensor, this can lead to the failure of your car's catalyst (may burst), which will result in an expensive repair. The cost of new catalysts is very high due to the content of precious alloys. On some cars, there are several catalysts, the cost of which can reach up to 90,000 rubles. So do not pull with the replacement of the sensor. Although the replacement of the sensor and its cost is not very small, but it is not commensurate with the cost of the exhaust gas converter system. You can also save on replacement costs by doing it yourself. Many vehicle manuals have detailed instructions How can I replace the oxygen sensor myself. If you know where the oxygen sensor is located, then it will not be difficult for you to disconnect the faulty "lambda probe" and replace it with a new one. Remember to pull with the replacement of this important element you can't pull!
Many drivers, in most cases, when the "check engine" indication appears, will think of serious problems in the car's engine, but will not even think to check the tightness of the fuel system, which may be broken due to a defect or insufficiently tightened fuel filler cap. This is a very common reason for the "Check" engine icon to appear.
Reason for the error: Leakage of the fuel system due to the passage of air by the fuel filler cap will increase the fuel consumption of the car, to which the car diagnostic system will issue an engine error by turning on the “Check engine” indication on the car instrument panel.
What needs to be done: If, when the "Check" indication appears, your car does not lose power, and there are no sound signs of engine damage (engine knocking, hum, creaking, etc.), then first of all check the tightness of the gas tank. Your gas tank cap may be cracked or not tight enough. If the cap was not tightened enough, after tightening it all the way, continue driving the car for a while to see if the engine error disappears. To prevent the appearance of an engine check for this reason, regularly check the fuel filler cap. Remember that periodically the cover must be replaced with a new one!
The car catalyst helps the car to make the exhaust gases of the engine more environmentally friendly. It converts carbon monoxide and other harmful substances into harmless compounds. If your exhaust gas catalyst has become unusable, you will notice this not only when the engine icon (check) appears, but also long before that, when the car's power drops by 2 times. For example, when you press the gas pedal, the car, as before, will not have good speakers overclocking.
What can cause a car catalytic converter to fail: if you regularly service your car, in accordance with the maintenance regulations of the car company, then the catalyst should not fail. main reason failure of the catalyst, this is an untimely replacement of a faulty oxygen sensor, as well as irregular replacement of spark plugs, at the end of the expiration date. When the oxygen sensor or spark plugs fail, the conversion of carbon monoxide in the catalyst to harmless chemicals stops, causing the catalyst to overheat, which can lead to failure.
What needs to be done: If your catalytic converter has become unusable, then you cannot drive a car, as the engine will not work correctly, warning about this by indicating the engine icon (check) on the dashboard. Also, you will have very much increased fuel consumption, and there will be no engine thrust. Although the replacement of the catalyst is a very expensive repair, there is nowhere to go from the repair. Although there is an alternative in replacing the catalyst with a flame arrester, but this is not a 100 percent option. Unfortunately, if you are not an experienced auto mechanic, then you cannot replace a faulty exhaust gas catalyst yourself. In any case, you will have to contact the auto repair shop. Remember that timely replacement of oxygen sensors and spark plugs protects your catalytic converter from damage!
The mass air flow sensor regulates how much air must be added to the gasoline mixture for optimum ignition of the fuel. The sensor constantly informs the car's computer about the amount of oxygen supplied. A defective mass air flow sensor increases fuel consumption, increases CO2 levels in the exhaust gas, and reduces engine power and ride quality. Also, with a faulty sensor, there is bad dynamics overclocking. In cold weather, a car with a faulty sensor does not start well.
What are the reasons for the failure of the mass air flow sensor: Most sensor failures are due to incorrect installation air filter when it is scheduled to be replaced. Also, if you do not regularly change the air filter, as required by the regulations Maintenance vehicle recommended by the manufacturer, the mass air flow sensor may fail.
What needs to be done: Theoretically you can for a long time drive with a broken mass air flow sensor (several weeks or months). But you will notice that the longer you drive, the more fuel consumption increases. Replacing the sensor in a car service is not so expensive, since the work itself does not take much time and is quite simple. The main costs are associated with the cost of the sensor, which for some car models can be 11,000-14,000 rubles if it is an original sensor or up to 6,000 rubles if an analog substitute. Self-replacement sensor is very simple. But due to the low cost of replacing the sensor, you can entrust this work to a master in a car service. Remember that it is necessary to change the air filter regularly, following the vehicle maintenance regulations!
Spark plugs in a car are the main parts for igniting the fuel mixture. With faulty spark plugs, there is an incorrect spark supply to ignite the gasoline mixture. Faulty plugs often have no spark or an incorrect spark interval, which affects wrong work engine. If the spark plugs do not work properly during acceleration, especially from a standstill, you may feel slight jolts.
What are the reasons for the failure of spark plugs: Most spark plugs in pre-1996 vehicles need to be changed every 25,000-30,000 kilometers. In newer cars, spark plugs last more than 150,000 km. However, these scheduled spark plug replacement times may be reduced due to various factors related to fuel quality and driving style.
What needs to be done: If your candles have not been changed for a long time, or if you feel ignition-related failures in the engine, then you should immediately replace them with new ones without delay. Do not try to save money on late replacement of spark plugs, as the cost of candles is not very expensive, as well as the work of replacing them. By changing old spark plugs, you will improve engine performance and reduce vehicle fuel consumption. It is quite easy to change the spark plugs yourself. Basically, they are easily accessible under the hood of the car. You need an ordinary spark plug wrench to unscrew the spark plugs from the engine. It is also advisable to monitor the high voltage wires, as over time they can become unusable and pass electricity that is transmitted to the spark plugs, which will reduce the strength of the spark. Remember that regular replacement of spark plugs, in accordance with the maintenance schedule for your car, keeps your exhaust gas catalyst from breakdowns, and also improves engine performance!
The owner of a long gazelle business came to us from the far northern Urals, the city of Novy Urengoy, complaining about a faulty stove, he says the stove does not heat at all, but he bought this workhorse off hand the other day and did not check the operation of the stove, so you need to figure out the malfunction. Error lights up on display E3 and E7(E3 and E7).
And so, we start checking with visual inspection heater control unit (BUO) 2705-8121020. Fault lights up on display E3. Looking ahead, let's say that this fault connected to the heater damper gear motor (90.3780) or MR-2-01, which is located next to the driver's right foot under the panel. Having looked under the panel, having decided to check whether both connectors are latched, we did not find this gear motor, but only the connectors dangled. Apparently the previous owner removed the gear motor, but did not install a new one. Installing a new gear motor.
Video. Checking the heater damper gear motor (90.3780) or MR-2-01.
With this motor reducer ( 90.3780
) connected 2 errors:
E3- malfunction of the damper position sensor ( rheostat), which determines the current damper position.
E6- a malfunction of the motor itself, the gear motor that controls the damper.
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We check the performance of the heater, turn on the ignition. Error E3 disappeared, but the error lit up E7. The stove still blows cold air, although the gear motor 90.3780 works properly. Next, we check the heater tap, because it is responsible for supplying hot coolant to the heater radiator, and an error lights up because of it E7. We set the temperature regulator on the control unit to the hottest position by hand, check the hoses going to the heater radiator.
We have both pipes going to the stove radiator turned out to be cold, although the pump is working and the supply hose to the tap is hot, which means that for some reason the tap does not open. The easiest way to check the operation of the tap is to turn the temperature control to the maximum and minimum with the car turned off. The stove faucet should make characteristic clicks indicating its operation. But we did not hear any sounds, so we are conducting a more detailed check. We start by checking the stove tap connector.
First, let's check the +12 volt power supply (the orange wire of the tap, the white wire of the wiring connector), the ground (the black wire of the tap and the black wire of the wiring connector) and the control signals to the heater tap: brown tap (brown wire connector) - heat, white tap (green connector wiring) - cold.
For clarity and to check the performance of the control unit, we will assemble a simple probe on LEDs. It will clearly show us whether cold / warm control signals are being sent from the control unit.
If one of the control signals is missing, then you should ring the wiring from the heater tap to the control unit - these are green and brown wires. In our case, there was no control signal on the brown wire, which is just responsible for the heat supply.
When the ignition is turned on and the heater tap is connected, a voltage of about +10 ... +12 volts coming from the heater tap should hang on the green and brown wires. At the moment of adjusting the heat / cold, a control minus should appear on one of these wires. If there is no control signal, then the control transistor in the control unit itself has burned out. To check the control transistors, you need to disassemble the climate system unit and check the control keys.
The blue transistor is responsible for switching to the cold position, the red transistor is responsible for controlling the hot position
In this circuitry, to control the crane, n-p-n SMD transistors in sot23 package. To replace a non-working key, you can use any N-P-N a transistor designed for a collector current of at least 100mA and a voltage of at least 20 volts, for example, a common transistor BC547. Or C945, which we just found. Let's bring brief scheme power transistor.
In our case, the red control key, which is just responsible for the heat supply, was faulty.
It is possible to install a SMD transistor in another case, for example, in TO92, but you have to solder and bend the legs.
After replacing the faulty transistor, the heater tap started working as it should, error E7 disappeared, and the interior of our gazelles began to warm up :)
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Instruction
Icon with the letter E, or just the letter E, in top panel mobile device means that the phone is in the EGPRS coverage area. Majority modern models phones support different networks; GSM is the standard, although UMTS is also possible. The appearance of the letter E indicates that the access point is open to the machine, but does not necessarily mean that the EGPRS network is being used for data transmission. Find out what exactly is indicated in the "Access point" field in the phone settings: the value WAP GPRS or GPRS Internet.nw implies the use of this particular network for information transfer. In this case, the letter E means only the potential use of the EGPRS network.
If there is confidence that the phone is working under Android control, uses an Edge connection to active connection to the Internet for verification possible updates, some forums advise using a specialized service code *#4777*8665# to call the Attach Mode Settings menu. Specify the GPRS detach command and reboot mobile device.
Apple does not explicitly disable the GPRS/Edge data service, although in roaming conditions, for example, this feature may be too expensive. Therefore, to disable this feature, you must use the tweak in changing the APN parameters in iPhone configurations. To do this, open the "Settings" menu located on home page phone and go to General. Expand the "Network" link and select the Edge section. Print sign. (dot) in the "APN Address" line immediately after the address. This action will result in the fact that when you try to use this function, a message appears about the inactivity of the selected service and the impossibility of data transfer.
Sources:
- How to temporarily disable the Edge data service?
The use of edge-based mobile Internet is beneficial for those for whom freedom of movement when working on the network is necessary. To increase the connection speed, there are several ways, varying depending on the task.
Instruction
Increase in speed at using edge perhaps by cutting down on the number of programs that use an existing Internet connection, or by minimizing the items that are loaded during the loading of Internet pages. To speed up web surfing, it is recommended to configure your web browser in such a way that additional elements such as pictures or java and flash elements will not be loaded. Make these changes in your web browser settings. Also disable all programs that in one way or another can interfere with page loading. These include instant messengers, downloaders, and torrent clients. It is important to disable all active downloads carried out using the browser - often they are the main reason slow loading pages.
To increase the speed when downloading files, optimize the processes that affect the network connection. Close the browser, after stopping all active downloads. Disable the torrent client, even if there are no active downloads. Open the tray and close the programs that are running in background. At the time of download, it is also advisable to disable the antivirus, as well as programs that download their updates. Check this action by launching Task Manager and opening the running processes tab. Disable all processes that contain update in their name - in this moment time they download updates.
When downloading a file using a torrent client, follow the recommendations outlined in the previous steps. In addition, configure the client in such a way that maximum amount concurrent downloads will be equal to one. Select all downloads and set the upload speed limit to one kilobit per second. Highlight the current download and give it the highest priority, removing the speed limit if there is one. Do not start processes that use the Internet connection until the download is complete.
Quite often there is a need to turn off GPRS / EDGE data transmission in the phone for a while. This should be done especially in roaming conditions in order to temporarily not use the service. Also, the service has to be turned off when traffic is exceeded.
Instruction
Dial *#4777*8665# (for "Samsung" phones). In the "Attach mode settings" menu that opens, select the "gprs detach" item, uncheck it. Disable mobile phone and turn it on again, after which the option will be deactivated.
To disable the EDGE service, slightly change the access parameters of the APN through which you receive this service. It is enough to put a dot at the end of the APN address. When requesting data in this case, you will receive the message "Service is not connected" and they will not be transmitted. To return the service, replace the setting with the correct one by removing the dot.
Use the SBSetting utility. This program can be downloaded from the Internet free access. Install it on your phone, go to the menu and find the option to enable/disable EDGE.
If you have iPhone iOS 4.0, disable EDGE won't be difficult. Go to the phone menu, select the "Settings" section, then the "General" item, then "Network". Disable the "Cellular Data" option. After its activation, no program will enter the Internet using GPRS traffic.
Go to Mobile Internet – Safari browser. Follow the link "iPhone No Data.Com". Then click on the button that says " turn off EDGE/3G" (i.e. turn off). An "Install" button will appear in the open dialog box, click on it. A dialog box will appear next with the "Install Now" button. Click on it, thereby disabling the EDGE service on your iPhone. Please note that if you are using WiFi connection, turn off this option not necessary.
Call to customer service mobile operator Beeline, if you are a subscriber of this network. Ask to disable the automatically connected "Any apn" service, which is responsible for providing the EDGE service. With zero "Apn" the phone will not go online. Or ask to deactivate the GPRS service (EDGE is simple extension, which allows GPRS to operate at a higher speed).
