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.
We learn how to check and clean the mass air flow sensor on a VAZ 2114
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.
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.
Causes of malfunctions
The mass air flow sensor can break down not only due to problems in the crankcase ventilation. The ventilation system itself in the VAZ 2114 is dual-circuit; it is responsible for the operation of the internal combustion engine in closed or open throttle mode.
When the damper is closed, gases from the crankcase escape through the line, but some of them remain in the idle line. The gas may come into contact with the MAF resistor on the VAZ 2114, and as a result of resin accumulating on its body, the device may produce incorrect data.
Accordingly, this leads to various malfunctions of the regulator (video author - KOSSS102).
Diagnosis of failure
If the air flow sensor breaks down, the symptoms of the malfunction can be very different. First of all, fuel consumption will increase; another symptom may be floating engine speed.
In addition to these signs of failure, the following can be identified:
- failures in the operation of the power unit;
- slower car acceleration, poor dynamics;
- the power unit can turn off when changing gears;
- decrease in power and increase in gasoline consumption;
- a heated internal combustion engine is more difficult to start;
- the Check light appears on the control panel.
The last symptom may not appear if the controller fails completely. How to check the MAF on your own? Diagnostics consists of identifying the impulse.
If the impulse is low, this indicates:
- possible short circuit or broken wiring;
- regulator failure;
- incorrect operation of the ECU;
- oxidation of contacts;
- that the controller is not connected.
Clogged air flow regulator
Check Features
To understand how the mass air flow sensor is checked, first find the device located in the engine compartment. On VAZ 2114 cars the regulator is located on the air filter line. How to check the sensor yourself?
First, the controller must be disconnected from the network; to do this, press on the wire fastening. Start the engine and let it run for a while. You need to drive the car a little - if it accelerates faster than usual, then this indicates a failure of the controller.
The diagnostic procedure can be carried out by replacing the firmware of the control unit. There is a small stop on the throttle; you need to place a plate under it, its thickness should be about 1 mm, thanks to this it will be possible to increase the speed. Then the power supply to the regulator is also turned off; when the device is operational, the motor should stall (video author - Vanechek 01rus).
Cleaning instructions
As practice shows, cleaning the mass air flow sensor is one of the most effective methods of restoring the functionality of the controller. Therefore, if the sensor breaks down, it is not necessary to change it, especially since such a pleasure today is not cheap. This procedure is necessary because over time it becomes dirty and shows other parameters.
So, how to clean the mass air flow sensor at home with your own hands:
- You will need a Phillips head screwdriver; use it to loosen the clamp securing the line from the air intake.
- Next, dismantle the corrugation and visually assess the condition of the system. You may see condensation or traces of engine fluid under the corrugation.
- Carefully inspect the inside of the controller. If everything is normal with the system, then there will be no traces of leaks or contamination. As practice shows, the sensitive element often breaks precisely due to an excess of contamination. In order not to avoid problems of this kind in the future, it is necessary to periodically replace the air filter. This procedure is carried out in accordance with technical regulations. Engine fluid may enter the controller as a result of an increased level of consumables in the crankcase. Accordingly, this occurs as a result of a clogged oil separator in the ventilation system.
- The regulator itself is fixed with two bolts on the line. The removal procedure is carried out using an open-end wrench. At this stage, if you are sure that the device has failed, you can replace it.
- You can see the entrance on which there will be a sealing rubber band designed to protect the device from the suction of dirty air flow. If you do not have a seal, it may have caught on the filter element. Accordingly, this will lead to the regulator input grid being contaminated.
- Clean the mesh using available materials. To do this, you can use a regular toothpick or toothbrush. After cleaning, the seal can be put back and the regulator can be put back in place.
Sorry, there are no surveys available at this time.
“Proper cleaning of the mass air flow sensor on 2114”
Detailed instructions are given in the video (the author of the video is IZO)))LENTA).
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.
Mass air flow sensor VAZ 2114
- Amount of air consumed;
- Reaction time.
The accuracy of measuring the air consumption of the engine allows the controller to determine in what proportion it is necessary to mix air with fuel. If the sensor produces incorrect values, the resulting air-fuel mixture does not correspond to the current engine operating mode. This leads to a decrease in power, an increase in fuel consumption, and a deterioration in the dynamics and response of the car. The response of controllers from different manufacturers to these parameters may differ.
For example, January-5.1, in case of slight overestimation or underestimation of values, determines the error of the mass air flow sensor based on the readings of the oxygen sensor, thus adjusting the duration of fuel injection. Increasing the sensor response time will cause the controller to not keep up, and at the time of acceleration you will notice “dips” of the engine. The same sensor error when using a more sensitive Bosch controller will lead to floating idle speed, although there will be no noticeable dips during acceleration.
What air flow should be on a VAZ 2114?
A 1.5 liter VAZ 2114 engine with a working mass air flow sensor at 850-950 rpm consumes from 10±0.5 kg of air per hour of operation, and at 2000 rpm - from 19 kg to 21 kg. If the amount of air consumed at the same speed decreases, the dynamics of the car also decreases, but fuel is saved. Conversely, increased air consumption leads to increased dynamics and higher fuel consumption. In this case, it may be difficult to start the engine in cold weather. If the sensor readings deviate from the real ones by 2-4 kg, the engine will begin to become very capricious and “dull”. Disabling the sensor will force the motor to continue operating in emergency mode.
Causes of malfunction
Common to most domestic cars, the reason why the VAZ 2114 air flow sensor breaks is hidden in the crankcase ventilation system. It has two circuits that ensure operation with the throttle valve open or closed. If the throttle is buried, crankcase gases are discharged along the line (d=1.5 mm) into the space available behind it. A certain percentage of these gases accumulates in the idle line, where it comes into contact with the film-coated MAF resistor. It is also sensitive to fluctuations in the gas mixture in the intake system. The resin settles on the surface of the resistor, and the sensor begins to “lie.” Because of this, the idle air control sticks, and it begins to jam when starting the engine.
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.
Symptoms of a problem
A non-working VAZ 2114 mass air flow sensor leads to the appearance of a number of symptoms in the behavior of the injection engine. The malfunction appears gradually, starting with an increase in fuel consumption and floating speed, ultimately destabilizing engine operation.
From personal experience using a front-wheel drive car as an example, I can say that I encountered the following problem: first the injector icon came on, then the speed began to fluctuate greatly and fuel consumption almost doubled.
You can calculate a non-working VAZ 2114 air sensor using the following criteria:
- failures when idling and under load;
- The internal combustion engine stalls when trying to change gear;
- decreased dynamics, the car accelerates slowly;
- fuel consumption increased;
- engine power has dropped;
- Badly ;
- The Check Engine signal appears.
If the mass air flow sensor is already dead, the Check Engine light may not come on. Then the malfunction can be determined by the error generated by the on-board computer. Diagnostics of the MAF signal level will also help. A low level may indicate the following:
- There is no MAF connection;
- malfunction in the sensor connection circuit (break);
- the ground in the connection circuit is broken or oxidized;
- the signal wires are broken or incorrectly connected, perhaps they are short-circuited;
- engine control unit malfunction;
- DMRV does not work.
If you notice the above signs, do not rush to buy a new sensor. It is by no means the cheapest and will cost 1500-4000 rubles. First of all, make sure that this is the reason. You can check and clean the old one at a service center or yourself if you have the necessary equipment.
Checking the mass air flow sensor
Before you start experimenting, take the time to read the service manual. It describes in detail what a mass air flow sensor on a VAZ 2114 is and how to replace it.
We are looking for a sensor. Open the hood and find the air filter pipe. The mass air flow sensor is located on it, which determines the flow of air passing through the filter. I will give several options on how to check the mass air flow sensor yourself.
- Disable the sensor. Disconnect the block with wires from the connector by pressing the latch located below. Start the engine (1500 rpm or more). The controller understands the shutdown of the mass air flow sensor as an emergency condition and prepares the fuel-air mixture based on the position of the throttle valve. Try driving a short distance. If the car accelerates noticeably faster, this indicates a non-working mass air flow sensor. I would like to note that in the disabled state for ECUs Y7.2 and M7.9.7. RPM doesn't increase!
- Replacing the controller firmware. The original ECU firmware could have been replaced with an alternative one. In such a situation, we do not know which algorithm is prescribed in the case of operation in the mode discussed in the first paragraph. The throttle valve has a stop under which you need to place a thin plate (about 1 mm) to raise the speed. Then you need to disconnect the chip with the sensor. If the sensor is faulty, the engine should stall. If the engine is running, then the reason is due to the firmware features: the IAC steps are written incorrectly.
- Voltage measurement. Testing gives good results when working with Bosch sensors. You will need a multimeter. Select the DC voltage measurement mode and set the maximum value to 2 V.
The connection diagram for the VAZ 2114 looks like this:
- yellow – incoming signal;
- gray with white – power output;
- green – grounding;
- pink with black – output to the main relay.
The colors may be different, but the sequence of connectors is the same.
Next, you need to turn on the ignition with the engine off. Connect the red (positive) probe of the tester to the yellow output, and the black (negative) probe to the green. Multimeter probes are inserted along the specified wires directly through the rubber seals of the connectors without damaging the insulation. For prevention, I recommend moistening the probes with WD-40. Intermediates or needles are not recommended due to the additional error they introduce. Measure the voltage. Compare the result with the table:
| Voltage, V | State |
| 1,01 – 1,02 | Good. The sensor is almost new and will last a long time. |
| 1,02 – 1,03 | Satisfactory. The sensor is old, but works properly. |
| 1,03 – 1,04 | Bad. The resource is almost exhausted. Will have to replace it soon. |
| 1,04 – 1,05 | Deplorable. The resource has been exhausted. Suitable for use if there are no alarming symptoms. It is advisable to replace |
| 1.05 – and above | Emergency. The sensor is faulty (possibly for a long time). Replacement is required. |
A newly installed sensor gives an output voltage of 0.996–1.01 V. Over time, it increases. A higher value means a higher percentage of wear.
Voltage data from the sensors is recorded by the on-board computer and can be viewed by selecting the appropriate group of parameters.
- Inspection and cleaning. Use a Phillips screwdriver to loosen the clamp holding the air intake pipe. We remove the corrugation and check whether there are traces of oil and/or condensation inside it, as well as on the inner surface of the sensor. Normally they shouldn't be there. The sensing element of the mass air flow sensor often breaks due to dirt getting on it. This can easily be avoided by regularly replacing the air filter. Reasons for oil getting into the air flow sensor:
- the permissible oil level in the crankcase has been exceeded
- The oil separator of the ventilation system is clogged
The sensor is attached to the pipe with two screws. We unscrew them with an open-end wrench (x10) and remove the sensor itself. There is an entrance at the front, which must be protected from the leakage of untreated air with an o-ring rubber seal. If it is missing or remains in the filter housing, dust clogs the sensor input grid. It needs to be cleaned, the seal installed, the leaks checked and the sensor put back in.
- Comparison with a working sensor. From personal experience, I was convinced that the most accurate test is to install a sensor that is known to work and compare the behavior of the engine with the “native” one.
In addition to the options considered for how to check the mass air flow sensor yourself, you can also contact a service center that has special equipment and carry out 100% diagnostics, for example, using the method of evaluating an oscillogram.
Device malfunctions and diagnostics
When a breakdown occurs, symptoms appear that are difficult to miss during constant use of the VAZ 2114:
• Motor power becomes lower; • The car does not start well even when it is hot; • Increased fuel consumption; • Acceleration is slower than usual.
These are the main diagnoses. They may also appear during other failures affecting the power plant. To be sure that the mass air flow sensor is not working properly, you need to check the device. There are a lot of ways to check a device, but two main ones are worth highlighting: visual inspection and testing with a multimeter.
Visual inspection
It is necessary to remove the clamp from the corrugation, which is attached to the air intake. You can unscrew it with a Phillips screwdriver. It is necessary to carefully check the surfaces of the corrugation and flow meter. They should have no traces of oil or condensation, and the sensor should be clean. But if the owner of a VAZ 2114 rarely changes the air filter, then you shouldn’t be surprised at the breakdown of the mass air flow sensor - the ingress of dirt will be fatal to the electronics.
Oil on the sensor is a warning that the oil level in the crankcase has increased, or a clogged oil sump may also be the cause. To test this theory, you need to remove the two fasteners with the tenth key and remove the flow meter from the filter housing. A rubber sealing ring must be installed on the inlet edge of the air filter. If it is not there, it means it has gotten into the air filter. In this situation, a small layer of dust appears on the inlet grid of the mass flow sensor. Such a defect also often damages the device, so it is necessary to change the air filter in the VAZ 2114 and also check it regularly. In the case of dust deposits, the VAZ 2114 sensor can be brought back to life - you need to carefully clean it, put on a seal and place it inside the case.
Checking with a multimeter
This method is suitable for modern flow meters. To check it, you need to turn on the multimeter and set it to measure DC current. The limit on the device should be set to 2 Volts. The MAF has the following pinout:
• Pink/black leads to the main relay; • The yellow wire goes to the signal input (it is located on the side of the windshield); • Green wire – ground; • Gray-white wire – voltage output.
While the colors may vary depending on the manufacturer, the layout always remains the same. Now you need to activate the ignition, but you do not need to start the engine. You should take a multimeter and connect its red probe to the yellow signal wire, and the black one to the green one. This combination allows you to measure the voltage between two elements. The ends of the tester probes allow you to take measurements without damaging the insulation of the structure - you need to go along the indicated wires.
Tip: It is not recommended to use attachments (for example, needles), as they cause errors. There should be a spread in the diagnosis of a mass air flow sensor, since every number is important.
The output voltage of the new device will be from 0.966 to 1.01 V. But over time, the indicator changes, usually the voltage increases upward. The more the indicator goes up, the more wear on the flow meter. By measuring you can determine the condition of the device:
• From 1.01 to 1.02 – the flow meter is working properly; • From 1.02 to 1.03 – tasks are being completed, but there is already wear and tear; • From 1.03 to 1.05 – the mass air flow sensor will soon be faulty; • From 1.5 and more – the sensor does not work and requires replacement.
Typical operating parameters of VAZ injection engines.
Here I found useful information on typical parameters. Made essentially as a note to myself.
For many novice diagnosticians and ordinary car enthusiasts who are interested in the topic of diagnostics, information about typical engine parameters will be useful. Since VAZ car engines are the most common and easiest to repair, we’ll start with them. What should you pay attention to first when analyzing engine operating parameters? 1. The engine is stopped. 1.1 Coolant and air temperature sensors (if equipped). The temperature is checked to ensure that the readings correspond to the actual engine and air temperatures. It is better to check using a non-contact thermometer. By the way, one of the most reliable in the injection system of VAZ engines are temperature sensors.
1.2 Throttle position (except for systems with an electronic gas pedal). The gas pedal is released - 0%, the accelerator is pressed - according to the opening of the throttle valve. We played with the gas pedal, released it - it should also remain 0%, while the ADC with a dpdz of about 0.5V. If the opening angle jumps from 0 to 1-2%, then as a rule this is a sign of a worn out valve. Less common are faults in the sensor wiring. With the gas pedal fully pressed, some units will show 100% opening (such as January 5.1, January 7.2), while others such as Bosch MP 7.0 will only show 75%. This is fine.
1.3 MAF ADC channel in rest mode: 0.996/1.016 V - normal, up to 1.035 V is still acceptable, everything above is already a reason to think about replacing the mass air flow sensor. Injection systems equipped with feedback from an oxygen sensor are able to correct, to some extent, incorrect readings of the mass air flow sensor, but there is a limit to everything, so you should not delay replacing this sensor if it is already worn out.
2. The engine is idling.
2.1 Idle speed. Typically this is 800 - 850 rpm with a fully warmed up engine. The idle speed value depends on the engine temperature and is set in the engine control program.
2.2 Mass air flow. For 8-valve engines, the typical value is 8-10 kg/h, for 16-valve engines - 7-9.5 kg/h with a fully warmed-up engine at idle. For the M73 ECU these values are slightly higher due to a design feature.
M73 - 2114. Increased fuel consumption.
#1 TRS
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#2 Vasiliy Armeev
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#3 Sasha
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What I'm treating: 1. valve adjustment - definitely 2. adjustment of DP leaks - definitely (although on the latest version 2.9 which I tried to fix this issue in software, it's terrible that they screwed up the IAC in particular and the IAC in general) 3. replacing the factory software - definitely.
According to the results: in winter in the city with an aggressive style 9.0-9.4 92 gasoline. With a moderate driving style - factory 8.6-9.2 per hundred.
And yes, 12-13 is the norm in stock for them.
Before ordering modified software, carefully read the RULES
Attention! I don't work with car owners! I do not work with firmware “readers and uploaders”!
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#4 DimanD
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In all cases, I threw in new 037 mass air flow sensors - the readings did not change
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#5 dosik
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adjustment of DP leaks - definitely (although on the latest version 2.9, which I tried to fix this issue in software, it’s terrible that they screwed up the IAC in particular and the XX in general)
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#8 Sasha
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Before ordering modified software, carefully read the RULES
Attention! I don't work with car owners! I do not work with firmware “readers and uploaders”!
For work issues, available from 8.00 to 17.00 Moscow time . Requests received after this time will be reviewed the next day. Attention! Ordering the missing modified software in the APC Client database is available from your personal account on the store website.
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#9 AVA
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2. adjusting the DP leaks - definitely (although on the latest version 2.9 which I tried to fix this issue in software, it’s terrible that they screwed up the IAC in particular and the XX in general) 3. replacing the factory software - definitely.
Oh, version 2.9 already? I was our last 2.6. Did you play with new cards? They made a lot of calibers in STR according to XX, my eyes wide open
