The VAZ-2114 engine can have 8 valves or 16. The latter option is more powerful. In order for the car not to waste a lot of fuel and to work properly, it is necessary for the mass air flow sensor to produce the correct indicators. Its primary task is to measure the amount of air consumed and the reaction time. The accuracy of the indicators allows the controller to determine in what proportion the air and fuel need to be mixed. If the device shows inaccurate data, then the resulting fuel mixture does not correspond to the engine operating mode. In this case, fuel is consumed in large quantities and power is reduced.
Optimal air flow
If the mass air flow sensor is operational, then when the engine is running at 900 rpm, the volume of air used will be at least 10 kg per hour. When the speed increases to 2 thousand, this figure will increase to approximately 20 kg. If the volume of air at such speeds drops, the dynamics of the vehicle will also decrease, and accordingly, this will lead to a decrease in gasoline consumption.
If these indicators increase, this will also contribute to an increase in fuel volume. If the parameter deviates by 2-4 kg, you should not allow it, since in this case the operation of the power unit may be incorrect.
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Prevention of breakdowns and cleaning of the air flow sensor of the VAZ 2114
The flow meter sensor is located in a vulnerable place: exposure to temperature changes, moisture, dust.
Precision electronics located in the measuring channel fail when foreign objects enter.
- untimely replacement of the air filter;
- the use of so-called “zero” filters;
- loose connection of the mass air flow sensor with the air duct flanges;
- moisture entering the air intake;
- Debris left in the ductwork or filter housing after repairs and maintenance.
How to clean the mass air flow sensor if contamination does not render it inoperable
The sensor must be removed, the protective nets removed, and blown with clean compressed air. If there is dried dirt or oil stains, washing with special means for mass air flow sensor is required. Of course, it is necessary to clean the air duct itself with the filter housing.
In most cases, such prevention brings the flow meter back to life.
What should be the air flow rate of the mass air flow sensor?
A VAZ 2114 with a 1.5 engine at a speed of 850-930 rpm with a properly functioning sensor should consume 9.5-10 kg of air per hour. At 2000 rpm - from approximately 19 kg to 21 kg per hour. If at the same speed, the amount of air consumed is less, the dynamics of the car are correspondingly less, but you save on fuel.
But if the situation is the opposite, then the dynamics will increase as well as fuel consumption. And with excessive air consumption, problems with starting the engine in cold weather can arise.
But if your readings deviate from the norm by 2-4 kg, then in this situation the engine will be “terribly dull” and you will have to turn off the sensor, and the engine will operate in emergency mode. For a more accurate diagnosis of the air flow sensor we will need:
- open-end wrench set to “10”;
- figured screwdriver;
- tester.
In this case, a tester will help us check the performance of the mass air flow sensor. We set the tester to measure DC current with a limit of 2 volts. We find two wires on the sensor:
- Yellow – exit.
- Green - mass.
We turn on the tester in DC voltage measurement mode and set the measurement limit to 2 Volts.
Our task is to measure the voltage between two wires with the ignition on (Do not start the engine). For prevention, the tester probes can be moistened with wd. The probe can be inserted through the rubber seals (fortunately the dimensions are suitable) without disturbing the insulation of the wires. So, let's measure the MAF readings and look at the results.
Voltage on DMRV:
- 1.01-1.02 – The sensor is working and will last a long time.
- 1.02-1.03 – The sensor is alive, but already old.
- 1.03-1.04 – The sensor will soon reach the end of its life, plan to replace it.
- 1.04-1.05 – We change the sensor.
- 1.05 - ... - Dead and has been dead for a long time.
On all cars, the MAF parameters may differ slightly, as they say: “Each car is individual.” But the most accurate test, in my opinion, would be to replace the sensor with one that is known to work.
Causes of sensor failure: when replacement is required
The error of the sensor significantly worsens the functioning of the car as a whole, but this mainly affects the operation of the controller. When using a sensitive controller, this can lead to floating idle speed, but there will be no noticeable dips during acceleration. In general, the readings should be normal, so you need to monitor this and, in case of malfunction, replace the device.
Note that this device does not have an automatic fault diagnosis system, so it is quite difficult to determine the presence of such faults. However, it is very important to do this, since the functioning of the machine as a whole depends on the device. The main signs of a sensor malfunction are:
- failures in readings (incorrect data on air consumption);
- deterioration in vehicle acceleration;
- increased fuel consumption;
- problems when switching gears.
Most VAZ-2114 cars are equipped with an on-board computer, which displays errors in the operation of the sensor. Problems can be caused by:
- insufficient fixation of the contact block;
- oxidation of contacts;
- damage to the device;
- broken wires.
If malfunctions occur, you must take the car to a technical service to have the problems fixed.
There is no need to rush to replace the device, since it is likely that it just needs to be repaired. If you are not good at this, then it is better not to risk repairing the sensor yourself. In order to organize its work, you must have certain knowledge and skills.
If you have never done this, then seek help from a specialist, as incorrect repairs can lead to serious problems with the operation of the engine and other components of the car. If you understand the insides of your vehicle, then proceed as follows:
- As a rule, the sensor can be adjusted to work properly by cleaning it. Cleaning is carried out using the necessary equipment or in a car service. Use a Phillips screwdriver to loosen the clamp that holds the air intake pipe.
- Then the corrugation is removed and the presence of traces of oil or condensation is checked, since they mainly provoke problems in the operation of the device.
- After this, the sensor is cleaned of dirt and a seal is installed.
- Next you need to check the tightness and return it to its place.
Every car enthusiast must ensure that all components of his iron horse are working properly. In the event of a breakdown, you need to immediately take the car to a service center or fix it yourself. Today on the Internet you can find many instructions and videos that show how to change or repair certain machine parts.
Examination
There are several ways to check the functionality of the flow sensor. But first you need to determine where the desired object is located.
And our hero is in the engine compartment. Find the air filter pipe there. It is on this that the mass air flow sensor is located, which monitors the air flow passing through the filter. Replacing it is simple - just dismantle the device by removing it from its fasteners and putting a new one in place.
Now regarding the verification.
- Disconnect the sensor by disconnecting the wiring harness from the connector. Press the latch at the bottom and you'll be good to go. Now start the engine and raise the speed to at least 1500 rpm. By turning off the sensor, the car will perceive this as an emergency condition, so the mixture will be prepared depending on the current throttle position. Drive a short distance. If the car accelerates faster than usual, the mass air flow sensor has definitely failed.
- Replace the firmware. The original firmware of the electronic control unit is often changed. Therefore, we cannot find out which sensor operation algorithm was prescribed in the case of the first verification method. The throttle valve has a stop; a plate approximately 1 millimeter thick should be placed under it. This will increase the speed. Now the chip with the sensor is disabled. If the mass air flow sensor does not work, the engine will stall. If this does not happen, then the firmware is not original, the steps of the idle speed control are written incorrectly.
Checking with a multimeter
To do this, you will have to use a multimeter. And how can I check the functionality of the sensor using this method? Select the DC voltage measurement mode on the device and set the maximum value to 2V.
Check with a multimeter
Separately, you should familiarize yourself with the connection diagram in the case of the VAZ 2114.
Subsequence
Wire color
Meaning
Power output
Main relay output
In some cases, the color may differ, but the sequence always remains the same. This will prevent you from getting confused.
Turn on the ignition with the engine off. The positive probe of the multimeter is connected to the yellow output of the sensor, and the black, that is, positive, goes to the green.
The probes of the measuring device should be inserted through the rubber seals of the connectors without damaging the insulation. The probes should be moistened with the almighty WD 40. Now measure the voltage readings. Compare the result obtained with the data from the table.
Voltage indicator
Air flow sensor condition
The air flow sensor is in good working order, almost new condition, can serve for a long time
The sensor is in good condition, although old. There are no complaints about performance
The air flow sensor is in poor condition, has almost expired and will require immediate replacement
The condition is critical, the resource is exhausted. It is recommended to replace it as soon as possible to avoid troubles.
If you install a new sensor, it will initially show readings in the region of 0.996-1.01 V, but over time the voltage will begin to increase. This indicates wear.
Cleaning
Cleaning is one of the most effective ways to bring the mass air flow sensor back to life and ensure its operation for more than one season of operation of your VAZ 2114.
Let's figure out how to clean this measuring device.
- Using a Phillips screwdriver, loosen the clamp that holds the pipe from the air intake.
- Remove the corrugation and check if there are traces of oil or condensation inside.
- Examine the condition of the internal surface of the mass air flow sensor itself.
- If everything is fine, there should be no traces of contamination.
- The sensitive component of the sensor often fails due to contamination.
Pollution
- To avoid such problems with dirt, it is recommended to regularly replace the air filter according to the owner's manual.
- Oil may reach the sensor due to an increased oil level in the crankcase due to a clogged oil separator in the ventilation system.
- The sensor is held on the pipe using two screws.
- Dismantling is carried out with an open-end wrench. This way you can remove and replace the sensor if necessary.
- In front there is an entrance on which a rubber sealing ring should be located. It serves to protect against the suction of contaminated, unpurified air. If the seal is missing, it is caught on the filter. As a result, the input grid of the mass air flow sensor will become dirty.
- Clean the mesh with improvised means. You can use a toothpick or a toothbrush.
- Replace the seal and return the sensor to its rightful place.
Each method is effective in its own way. But it is best to check the performance of the mass air flow sensor by installing a new sensor in its place. By comparing the car's behavior, you will determine whether replacement or cleaning is necessary.
If you do not have the time or desire to deal with problems with the mass air flow sensor yourself, you can contact a car service center. There, using an oscillogram, they will help you check the condition of the device. But keep in mind that you will have to spend a significant amount of money on diagnostics and replacement at a service station. This is despite the fact that the flow sensor itself can cost 4 thousand rubles.
If there is a suspicion that the VAZ 2114 mass air flow sensor has failed, its operation can be checked:
- disconnect the sensor,
- start the engine,
- look at the idle speed.
If with the sensor disabled the idle speed is more than 1500 rpm
, which means that the VAZ 2114 mass air flow sensor has failed. In addition, if during a trip with the mass air flow sensor disabled, the car behaves faster and picks up speed better, this also means that the flow meter is faulty.
How much does a new sensor cost?
Of course, car parts are not cheap, but if necessary, they must be purchased in order for the vehicle to work properly. The sensor should be purchased only in specialized stores where there is a guarantee, and where you can actually get competent advice. This spare part costs around 350 rubles. As a rule, such options are very reliable and durable. It makes no sense to buy cheaper ones, since their characteristics are in no way inferior to those that cost 350. It’s not worth buying cheaper ones, because these are mostly Chinese parts that are short-lived and of poor quality. If you find it difficult to choose, then ask the seller which sensor is better to choose. Basically they are all similar, the only difference is the price. Please note that this part can also be purchased online. The main thing is not to be cheap, but also not to spend all your money on one spare part.
As we can see, any part of the machine becomes unusable over time, so it needs to be replaced. As for the idle speed sensor, this device also needs to be replaced from time to time for the accuracy of the indicators. Quite often, due to a faulty sensor, a car begins to have engine problems, speed deteriorates, etc.
etc. With such problems, it is quite dangerous to drive a car, since there is no guarantee that the engine will work without “whims”, and on the road this is very dangerous. You shouldn’t risk your most valuable assets; it’s better to send the car in for repairs or fix it yourself.
To ensure more efficient and stable operation of any modern engine, many different devices are used. One of these is the mass air flow sensor (MAF), in particular, we will talk about VAZ 2114 cars. Read more about the functions, malfunctions, diagnostics and cleaning of the controller below.
What is the VAZ 2114 mass air flow sensor and what functions does it perform? The primary task of the regulator is to create arrogance from air and fuel vapors. The regulator can measure two interconnected parameters, namely:
- reaction time;
- volume of air used.
In accordance with the information received, the correction device determines the required volume of components to create the mixture. If incorrect data is provided, the mixture will not be able to correspond to the operating mode of the power unit; accordingly, its power may decrease and fuel consumption may increase.
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