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The main signs of a malfunction of the DMRV (VAZ). What is a DMRV in a car: purpose, signs of malfunction. Normal operation of the DMRV sensor in a VAZ 2114.

For optimal operation of an injection internal combustion engine (hereinafter referred to as ICE), it is necessary to take into account how much air mixture enters the combustion chambers of the cylinders. Based on these data, the electronic control unit (hereinafter referred to as the ECU) determines the fuel supply conditions. In addition to information from the mass air flow sensor, its pressure and temperature are taken into account. Since mass air flow sensors are the most significant, we will consider their types, design features, diagnostic and replacement capabilities.

Purpose and explanation of the abbreviation

Flow meters, also known as volumetric meters or mass air flow meters (not to be confused with mass air flow meters and mass air flow sensors), are installed in diesel or gasoline-powered vehicles. The location of this sensor is not difficult to find, since it controls the air supply, you should look for it in the corresponding system, namely, after the air filter, on the way to the throttle valve (DZ).

The device is connected to the engine control unit. In cases where the mass air flow sensor is in a faulty condition or is missing, a rough calculation can be made based on the position of the air flow sensor. But with this measurement method it is impossible to ensure high accuracy, which will immediately lead to excessive fuel consumption. This once again indicates the key role of the flow meter in calculating the fuel mass supplied through the injectors.

In addition to information from the mass air flow sensor, the control unit also processes data coming from the following devices: camshaft sensor (camshaft sensor), DD (knock meter), remote sensor, cooling system temperature sensor, acidity meter (lambda probe), etc.

Types of mass air flow sensors, their design features and operating principle

Three types of VU meters are most widespread:

• Wire or thread.
• Film.
• Volumetric.

In the first two, the operating principle is based on obtaining information about the mass of the air flow by measuring its temperature. The latter may involve two accounting options:

Vortex sensor design (widely used by Mitsubishi Motors)

Designations:

• A – pressure measurement sensor to record the passage of the vortex. That is, the frequency of pressure and vortex formation will be the same, which makes it possible to measure the flow of the air mixture. At the output, using an ADC, the analog signal is converted into a digital one and transmitted to the ECU.
• B - special tubes that form an air flow similar in properties to laminar.
• C – bypass air ducts.
• D – column with sharp edges on which Karman vortices are formed.
• E – holes used to measure pressure.
• F – direction of air flow.

Wire sensors

Until recently, thread mass air flow sensor was the most common type of sensor installed on domestic cars of the GAZ and VAZ model range. An example of a wire flow meter design is shown below.

Designations:

• A – Electronic board.
• B – Connector for connecting the mass air flow sensor to the computer.
• C – CO adjustment.
• D – Flow meter housing.
• E – Ring.
• F – Platinum wire.
• G – Resistor for temperature compensation.
• N – Ring holder.
• I – Electronic board casing.

Operating principle and example of a functional diagram of a filament VU meter.

Having understood the design of the device, let's move on to the principle of its operation, it is based on the hot-wire method, in which a thermistor (RT), heated by the current passing through it, is placed in the air flow. Under its influence, the heat transfer changes, and, accordingly, the resistance RT, which makes it possible to calculate the volumetric flow rate of the air mixture? using King's equation:

I 2 *R=(K 1 +K 2 * ⎷ Q )*(T 1 -T 2) ,

where I is the current passing through RT and heating it to temperature T1. In this case, T 2 is the ambient temperature, and K 1 and K 2 are constant coefficients.

Based on the above formula, you can derive the volumetric air flow rate:

Q = (1/K 2)*(I 2 *R T /(T 1 – T 2) – K 1)

An example of a functional diagram with bridge connection of thermoelements is shown below.

Designations:

• Q - measured air flow.
• U – signal amplifier.
• R T - wire thermal resistance, as a rule, is made of platinum or tungsten filament, the thickness of which is in the range of 5.0-20.0 microns.
• R R – temperature compensator.
• R 1 -R 3 – ordinary resistances.

When the flow velocity is close to zero, the RT is heated to a certain temperature by the current passing through it, which allows the bridge to be kept in equilibrium. As soon as the flow of the air mixture increases, the thermistor begins to cool, which leads to a change in its internal resistance, and, as a result, an imbalance in the bridge circuit. As a result of this process, a current is generated at the output of the amplifier unit, which partially passes through the temperature compensator, which leads to the release of heat and makes it possible to compensate for its loss from the flow of the air mixture and restores the balance of the bridge.

The described process allows you to calculate the flow rate of the air mixture based on the amount of current passing through the bridge. In order for the signal to be perceived by the ECU, it is converted into a digital or analog format. The first allows you to determine the flow rate by the frequency of the output voltage, the second - by its level.

This implementation has a significant drawback - a high temperature error, so many manufacturers add a thermistor similar to the main one to the design, but do not expose it to air flow.

During operation, dust or dirt deposits may accumulate on the wire thermistor; to prevent this, this element is subjected to short-term high-temperature heating. It is performed after the internal combustion engine is turned off.

Film air meters

A film MAF works on the same principle as a filament one. The main differences lie in the design. In particular, silicon crystal is used instead of platinum filament resistance wire. It is coated with several layers of platinum plating, each of which plays a specific functional role, namely:

• Temperature sensor.
• Thermal resistances (usually there are two of them).
• Heating (compensation) resistor.

This crystal is installed in a protective casing and placed in a special channel through which the air mixture passes. The geometry of the channel is designed in such a way that temperature measurements are taken not only from the input flow, but also from the reflected flow. Thanks to the created conditions, a high speed of movement of the air mixture is achieved, which does not contribute to the deposition of dust or dirt on the protective housing of the crystal.

Designations:

• A – Flow meter body into which the measuring device (E) is inserted.
• B – Contacts of the connector that connects to the ECU.
• C – Sensitive element (silicon crystal with several layers of coating, placed in a protective casing).
• D – Electronic controller, with the help of which preliminary processing of signals is carried out.
• E – Body of the measuring device.
• F - Channel configured to take thermal readings from the reflected and input flow.
• G – Measured flow of air mixture.

As mentioned above, the operating principles of filament and film sensors are similar. That is, the sensitive element is initially heated to temperature. The flow of the air mixture cools the thermoelement, which makes it possible to calculate the mass of the air mixture passing through the sensor.

As in filament devices, the output signal can be analog or converted to digital format using an ADC.

It should be noted that the error of filament VU meters is about 1%; for film analogues this parameter is about 4%. However, most manufacturers have switched to film sensors. This is explained both by the lower cost of the latter and by the expanded functionality of the ECUs that process information from these devices. These factors overshadowed the accuracy of the instruments and their speed.

It should be noted that thanks to the development of flash microcontroller manufacturing technology, as well as the introduction of new solutions, it was possible to significantly reduce the error and increase the performance of film structures.

Interchangeability

This issue is quite relevant, especially taking into account the cost of original products from the imported automobile industry. But it’s not so simple here; let’s give an example. In the first production models of the Gorky Automobile Plant, the injection Volgas were equipped with a BOSCH air flow sensor. Somewhat later, imported sensors and controllers replaced domestic products.

A – imported filament air flow sensor manufactured by Bosh (pbt-gf30) and its domestic analogues B – JSCB “Impuls” and C – APZ

Structurally, these products were practically no different except for several design features, namely:

• The diameter of the wire used in a wirewound thermistor. Bosch products have a diameter of 0.07 mm, and domestic products have a diameter of 0.10 mm.
• The method of fastening the wire differs in the type of welding. For imported sensors this is resistance welding, for domestic products it is laser welding.
• Shape of a thread thermistor. Bosh has a U-shaped geometry, APZ produces devices with a V-shaped thread, and products from JSC Impulse are distinguished by the square shape of the thread suspension.

All the sensors given as an example were interchangeable until the Gorky Automobile Plant switched to film analogues. The reasons for the transition were described above.

Film air flow sensor Siemens for GAZ 31105

It makes no sense to give a domestic analogue to the sensor shown in the figure, since outwardly it is practically no different.

It should be noted that when switching from filament devices to film devices, most likely, it will be necessary to change the entire system, namely: the sensor itself, the connecting wire from it to the ECU, and, in fact, the controller itself. In some cases, the control can be adapted (reflashed) to work with another sensor. This problem is due to the fact that most filament flowmeters send analog signals, while film flowmeters send digital signals.

It should be noted that the first production VAZ cars with an injection engine were equipped with a filament air flow sensor (made by GM) with a digital output; examples include models 2107, 2109, 2110, etc. Now they are equipped with air flow sensor BOSCH 0 280 218 004 .

To select analogues, you can use information from official sources or thematic forums. For example, below is a table of the interchangeability of the mass flow sensor for VAZ cars.

The presented table clearly shows that, for example, the MAF sensor 0-280-218-116 is compatible with VAZ 21124 and 21214 engines, but is not suitable for 2114, 2112 (including those with 16 valves). Accordingly, you can find information on other VAZ models (for example, Lada Granta, Kalina, Priora, 21099, 2115, Niva Chevrolet, etc.).

As a rule, there will be no problems with other brands of cars of domestic or joint production (UAZ Patriot ZMZ 409, Daewoo Lanos or Nexia), choosing a replacement mass air flow sensor for them will not be a problem, the same applies to products of the Chinese automobile industry (KIA Ceed, Spectra, Sportage etc.). But in this case, there is a high probability that the MAF pinout may not match; a soldering iron will help correct the situation.

The situation is much more complicated with European, American and Japanese cars. Therefore, if you have a Toyota, Volkswagen Passat, Subaru, Mercedes, Ford Focus, Nissan Premiere P12, Renault Megane or another European, American or Japanese car, before replacing the mass air flow sensor, you need to carefully weigh all the solution options.

If you are interested, you can search online for an epic about an attempt to replace the “native” air meter with an analogue on a Nissan Almera H16. One attempt resulted in excessive fuel consumption even at idle.

In some cases, searching for an analogue one will be justified, especially if you take into account the cost of the “native” VU meter (for example, the BMW E160 or Nissan X-Trail T30).

Functionality check

Before diagnosing the mass air flow sensor, you need to know the symptoms that allow you to determine the degree of performance of the MAF (abbreviation for the English name of the device) sensor in the car. We list the main symptoms of a malfunction:

• The consumption of the fuel mixture has increased significantly, while at the same time acceleration has slowed down.
• The internal combustion engine idles with jerks. In this case, a decrease or increase in speed may be observed in idle mode.
• The engine does not start. Actually, this reason in itself does not mean that the flow meter in the car is faulty; there may be other reasons.
• A message appears about a problem with the engine (Cheeck Engine)

Example of the "Cheeck Engine" message displayed (marked in green)

These signs indicate a possible malfunction of the mass air flow sensor; in order to accurately determine the cause of the failure, diagnostics must be performed. It's easy to do it yourself. Connecting a diagnostic adapter to the ECU (if this option is possible) will help to significantly simplify the task, and then determine the serviceability or malfunction of the sensor using the error code. For example, error p0100 indicates a fault in the flow meter circuit.

But if you need to carry out diagnostics on domestic cars manufactured 10 years ago or more, then checking the mass air flow sensor can be carried out in one of the following ways:

1. Testing while moving.
2. Diagnostics using a multimeter or tester.
3. External inspection of the sensor.
4. Installation of a similar, known-good device.

Let's consider each of the listed methods.

Testing while driving

The easiest way to check is by analyzing the behavior of the internal combustion engine with the MAF sensor disabled. The algorithm of actions is as follows:

• You need to open the hood, turn off the flow meter, close the hood.
• We start the car, and the internal combustion engine goes into emergency mode. Accordingly, a message indicating a problem with the engine will appear on the dashboard (see Fig. 10). The amount of fuel mixture supplied will depend on the position of the remote control.
• Check the dynamics of the car and compare it with what it was before the sensor was turned off. If the car has become more dynamic and power has also increased, then this most likely indicates that the mass air flow sensor is faulty.

Please note that you can continue driving with the device turned off, but this is highly not recommended. Firstly, the consumption of the fuel mixture increases, and secondly, the lack of control over the oxygen regulator leads to increased pollution.

Diagnostics using a multimeter or tester

Signs of a malfunction of the mass air flow sensor can be identified by connecting the black probe to ground, and the red probe to the sensor signal input (the pinout can be found in the device data sheet, the main parameters are also indicated there).

Next, we set the measurement limits to 2.0 V, turn on the ignition and take measurements. If the device does not display anything, you need to check that the probes are connected correctly to ground and the flow meter signal. Based on the readings of the device, you can judge the general condition of the device:

• A voltage of 0.99-1.01 V indicates that the sensor is new and working properly.
• 1.01-1.02 V – used device, but its condition is good.
• 1.02-1.03 V - indicates that the device is still operational.
• 1.03 -1.04 the condition is approaching critical, that is, in the near future it is necessary to replace the mass air flow sensor with a new sensor.
• 1.04-1.05 – the device’s resources are almost exhausted.
• Over 1.05 - a new mass air flow sensor is definitely needed.

That is, you can correctly judge the state of the sensor by the voltage; a low signal level indicates an operational state.

External inspection of the sensor

This diagnostic method is no less effective than the previous ones. All that is necessary is to remove the sensor and assess its condition.

Inspect the sensor for damage and fluid

Characteristic signs of a malfunction are mechanical damage and liquid in the device. The latter indicates that the oil supply system to the engine is not adjusted. If the sensor is very dirty, the air filter should be replaced or cleaned.

Installing a similar, known-good device

This method almost always gives a clear answer to the question of the sensor’s performance. This method is quite difficult to implement in practice without purchasing a new device.

Briefly about the renovation

As a rule, MAF sensors that have become unusable cannot be repaired, except in cases where they require washing and cleaning.

In some cases, it is possible to repair the volumetric air flow sensor board, but this process will not prolong the life of the device for long. As for the boards in film sensors, without special equipment (for example, a programmer for a microcontroller), as well as skills and experience, it is pointless to try to restore them.

The optimal operation of the power unit in the “Ten” depends on many parameters and characteristics, in particular, on the quality of the air-fuel mixture. To monitor the correct ratio when forming a combustible mixture, the VAZ 2110 uses a mass air flow sensor. You can learn more about what this device is, how to diagnose and replace it, from this material.

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Principle of operation

What is a mass air flow sensor and what is its operating principle? Let’s say right away that you cannot confuse the mass air flow sensor with the outside air temperature controller, since these are two completely different devices. The primary purpose of the flow meter is to calculate the required volume of air flow that enters the engine cylinders. This air is one of the components in the formation of the air-fuel mixture. The mass air flow sensor itself in the “Ten” is located behind the air filter element.

In order for the engine to operate in normal mode, when forming a combustible mixture, the ratio of substances must be strictly observed - 1:14. If these proportions are not observed, the engine will not operate correctly, which will ultimately lead to excessive consumption of gasoline or a decrease in the dynamics and power of the vehicle. Thanks to the flow meter, the air flow is transferred to the engine cylinders in certain portions. Data on calculating the volume of air flow entering the engine is sent to. In accordance with the data received, the ECU calculates the required amount of fuel.

When the driver presses the gas pedal, the volume of supplied air flow increases significantly, and accordingly, this leads to an increase in gasoline consumption. If the vehicle moves evenly, then the portions of fuel and air flow that enter the cylinders will also be the same at each cycle. When you press the gas pedal, the throttle opens, which ultimately leads to an increase in the supply of air, and this also contributes to an increase in the load on the power unit.

Possible malfunctions and ways to eliminate them

Now let’s look at the main symptoms of a malfunction that will help determine if the flow meter is broken:

1. Increased gasoline consumption. In this case, the problem can be identified by the readings of the on-board computer, if the latter calculates the amount of fuel. If the mass air flow sensor breaks down, gasoline consumption may increase by one liter or more.
2. Reduced engine power during operation.
3. The car engine began to work less stably. The car takes longer to accelerate, and sometimes the engine picks up speed uncharacteristically quickly.
4. The Tens power unit does not start or starts, but not immediately, after several attempts.
5. Floating idle speed.

Of course, such symptoms of problems can also be associated with other malfunctions, for example, spark plugs, distributors and other components of the ignition system. Therefore, in order to accurately verify that the flow meter is not working, you will have to check the device. As for troubleshooting methods, the mass air flow sensor itself is usually not repairable, so in most cases, if there is a problem with its operation, the device is simply replaced. It happens that the reasons are due to poor contact of the device with the vehicle’s on-board network, so before replacing, we recommend checking the connection circuit, as well as the quality of contact of the device with the connector.

Methods for checking sensor functionality

How to check the flow meter yourself? There are several diagnostic options, we suggest you familiarize yourself with each of them (the author of the video is the Bezdelnik TV channel).

Shutdown

First you need to try disconnecting the flow meter from the power supply. To do this, you need to start the engine and let it run for a while. Next, you will need to disconnect the plug from the flow meter - after this, the emergency mode of operation of the motor should be activated. In this case, the calculation of the volume of the required air flow will be carried out in accordance with. If, after switching off, you notice that the engine began to work more correctly and at the same time it became more dynamic, then the mass air flow sensor definitely needs to be replaced.

Diagnostics using a multimeter

Diagnostics can be performed using a multimeter; for this, we recommend that you read the operating instructions for the tester. The device must be configured in the DC voltage measurement mode; it is usually marked with the symbols DCV or V.

To ensure that connecting the device does not cause difficulties, you need to know exactly the pinout of the device:

• black-red or pink contact is a connection to the control module;
• green is ground (grounding, ground), connected to the body or battery;
• gray-white contact - output voltage;
• yellow - used to supply current to the input.

Diagnostics with a multimeter is performed as follows:

1. To begin with, the tester should be turned on and the voltage value set on it to 20 volts, and then the probes from the device are connected to the corresponding contacts on the plug.
2. To make the connection more convenient, you can use pins; you will need two of them. Each of them is installed in a hole with green and yellow contacts. Then you will need to connect the probes of the device to these pins.
3. The next step is to activate the ignition and measure the voltage. Read more about the test results below (the author of the video is the IZO)))LENTA channel).

On a working device, the voltage level will be around 1.01-1.04. If the readings are between 1.02 and 1.05 volts, this indicates that the device will need to be changed in the near future. If the readings obtained are higher, then the flow meter must be replaced because it is faulty.

It should be noted that during operation, the voltage parameter will only increase, since the resistor components of the device wear out, and the resistance value, accordingly, decreases. You can also accurately determine the voltage using the on-board computer, if it has the appropriate function. To search, go to the flowmeter voltage section and find the U value.

Visual inspection

As for visual diagnostics, first of all it is necessary to check the condition of the corrugation in which the flow meter is installed, as well as the device itself. If, as a result of the check, you see traces of motor fluid or condensation, then it is possible that the device does not work for this reason. In some cases, cleaning the device from contaminants allows the flowmeter to resume operation and prevent possible replacement. It should be taken into account that contaminants usually accumulate as a result of infrequent replacement of the air filter element (the author of the video about the regulator malfunction is the channel In Sandro’s Garage).

If you notice traces of motor fluid, then there is a possibility that the reason lies in a clogged oil seal, or the problem may lie in exceeding the permissible level of lubricant in the crankcase. When cleaning is complete, you will need to make a visual inspection of the regulator - on the front of it you can see the rubber seal that is used for sealing. The seal is necessary to prevent uncleaned air flow and it may be that the rubber band moves a little - this will lead to the accumulation of dust on the flowmeter grid.

DIY replacement and installation instructions

How to replace the regulator in a garage:

1. First, turn off the engine and ignition.
2. Next, open the hood and find the location where the mass air flow sensor is installed. You need to disconnect the plug and wiring from the regulator.
3. After this, unscrew the bolts that secure the clamps, and then disconnect the intake manifold. This line is connected to the air filter housing.
4. After completing these steps, you must remove the flow meter from its installation location. Before installing a new mass air flow sensor, it is necessary to clean or rinse the installation site. Further installation and assembly is carried out in reverse order.

Photo gallery “Changing the flow meter”

Features of cleaning the regulator

How to clean the regulator by washing? In some cases, cleaning actually helps to extend the life of the flow meter; this process can be called a component of repair. For cleaning, you can use specialized products designed for this specific purpose. You can also use WD-40 liquid or carburetor cleaner.

How to wash the flow meter yourself:

1. First, you need to dismantle the mass air flow sensor, we talked about this in more detail above.
2. Once you have the device in your hands, you will need to use a cleaning agent to wash all sensitive components of the regulator. In particular, we are talking about wire mesh, thermal sensor, and contacts. When cleaning, be as careful as possible and regularly monitor the level of pressure of the jet from the cylinder. Please note that the stream itself should not be too strong; it is best to keep the balloon at a distance of approximately 5-10 cm from the device.
3. Wait a few minutes, then apply the cleanser again, wait a little again. The cleaning procedure must be carried out several times, but as practice shows, usually three times is enough to obtain the desired result.
4. Then, you need to pour distillate with alcohol into a medical syringe (you can find it in any pharmacy). Using a syringe, treat all sensitive components of the device, as well as contacts, this will allow them to be thoroughly cleaned.
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Video “Features of replacing a flow meter in a garage”

How the replacement procedure is carried out and what points should be taken into account when performing this task - find out from the video below (author - channel In Sandro's Garage).

Even the most ancient injection gasoline engine is stuffed to capacity with sensors and electronic systems. The failure of any element inevitably affects the operation of the entire engine. The VAZ-2110 received an engine inherited from the eight, it was modernized several times, but the engine control system did not change either on the eight-valve or on the 16-valve car, with minor exceptions. Today we will use the mass air flow sensor as one of the main ones in the power system.

Air flow meter location.

The air flow meter of the VAZ-2110-2112 (as well as all Togliatti injection engines without exception) is installed immediately behind the air filter at the entrance to the intake tract.

Its task is to measure the amount and temperature of air that the engine consumes.

These indications are of paramount importance for preparing a flammable mixture . The flow meter sends data to the engine ECU, which in turn instructs the injectors to prepare a richer or leaner mixture. This is without subtleties.

Sensor device

The sensor itself is a combination of two sensors - control and working, as well as a heating resistor.

As a result, air flow and temperature are converted into electrical impulses understandable to the ECU. This is a very gentle and accurate device; it allows you to calculate the cyclic filling of the cylinders with air and updates the parameters every 0.1 s.

Mass air flow sensor diagram.

Sensor working body - platinum heated thread. It heats up to operating temperature (from 100 to 1000 degrees), and when air enters, it cools down. The amount by which the filament temperature drops is converted into an electrical signal and, based on this value, the ECU calculates the mass and temperature of the air entering the combustion chamber. And based on this data, it prepares the required portion of fuel. In short - yes.

Symptoms of a malfunction of the mass air flow sensor on a VAZ-2110

Now about the symptoms of a malfunction of the mass air flow sensor. You need to understand that you can definitely blame the mass air flow sensor only after accurate computer diagnostics of the engine management system. Even the on-board computer can easily make mistakes. However, we will try to identify the breakdown without involving specialists.

Symptoms of sensor failure may coincide with symptoms of other malfunctions:

1. Increased or floating idle speed.
2. It is impossible to adjust the CO level at idle.
3. The engine stalls immediately after starting, the speed is maintained only when the throttle is open.
4. Increased fuel consumption.
5. The Check Engine light comes on.
6. Dips when changing speed, loss of power and dynamics.

The symptoms, as we see, are standard for any malfunction of the power and ignition systems. This means that a more detailed check and verification of the parameters with the nominal ones is necessary.

Check: parameters and compatibility

Sensor for Bosch M 7.9.7 controller - number 0 280 212 116 according to the VAZ catalog.

The difficulty in calculating the parameters and ratings of the sensor lies in the fact that on the VAZ At different times and on different engines, different devices with different ratings were installed . These ratings were programmed into the electronic control unit and if we install a sensor of a different type (although visually it may be exactly the same), the control system will no longer work correctly. Sensors were installed on dozens GM, Bosch, Siemens, a domestic sensor originally from Arzamas or Saratov .

The calibration for each of them is different. Only after 2004 did VAZ decide on the type of sensor and its ratings - this is a Bosch device of the HFM5 type in three modifications:

• was the first Mass air flow sensor HFM5-4.7, according to the Bosch catalog its number is 0 280 212 004, and according to the VAZ catalog it is 21083-1130010-01;
• HFM5-4.7 with article number 0 280 212 037 (21083-1130010-10 according to the VAZ catalogue);
• HFM5-CL, catalog number 0 280 212 116 or 21083-1130003-20 according to the VAZ book.

Peculiarities

We conclude that the sensor is selected not by the number of valves or engine size, but solely by the firmware version and ECU model.

Bosch sensor (21083-1130010-01) for controller January version 5.1.

For example, for the Bosch M7.9.7 ECU it is necessary to use the Bosch mass air flow sensor 0 280 212 116, and for the January controller version 5.1 - only Bosch 21083-1130010-01. That is, even if a sensor is installed from the factory that does not correspond to the ECU firmware, you cannot expect correct engine operation and normal fuel consumption. By the way, there are often cases when sensors were installed from the factory that do not correspond to the firmware version. Therefore, the first check is for compatibility. And then we take a multimeter and go into battle.

We check the mass air flow sensor on a VAZ-2110 with a multimeter

The sensor block, the first wire may not be there - this is normal.

To do this, we need to understand the pinout and the sensor connection diagram. As you can see, the block has only five wires:

1. + 12 Volt.
2. + 5 Volts.
3. Total ground (green wire).
4. Air temperature output signal.
5. Air flow signal output (yellow wire).

Electrical diagram for connecting the mass air flow sensor.

The pinout may differ in different firmware versions and on different sensors. Everything is clear with the first two contacts - take a multimeter and check the presence of voltage when the ignition is on. If there is no signal, we look for the cause either in broken wires or in poor contact. Now we check the main indicator - the accuracy and magnitude of the air flow signal. By the way, this can be checked without a multimeter, using the on-board computer, if one is installed:

1. We go to the menu, look for sensor parameters.
2. Find the voltage Udmrv.
3. The rating for all of the above modifications is from 0.996 to 1.01 V.

The platinum thread gets tired over time and distorts the impulse upward. A change of even one hundredth of a Volt is unacceptable. If the computer is not installed, we use a multimeter. Checking voltage between 3 and 5 (minus) contacts, setting the measurement limits to 2 V on the multimeter. Turn on the ignition, but do not start the engine.

Check table

We evaluate the result using this table:

conclusions

Replacing a non-working sensor is simple and straightforward, and you need to buy exactly the MAF that matches the ECU firmware version. Its price is from 2500 to 3500 rubles, depending on the manufacturer. Good luck to everyone and clean air to your engines!

Video about how you can try to clean the mass air flow sensor

A modern car engine is a high-tech unit of complex design, and this unit is “stuffed” with various electronics. There are a large number of different sensors that monitor its operation and many associated elements, so when it comes to diagnostics and repairs, many simply do not know where to go and what exactly needs to be checked. However, in reality, not everything is as complicated as it might seem at first glance: almost all sensors are subject to inspection and replacement, no exception. The main thing in this matter is to know how and what needs to be done.

But before I tell you how to check the air flow sensor of a VAZ 2114, I would like to say a few words about it itself. Just so, it will be easier for you to understand the information presented below.

So, the main task of the mass air flow sensor is to control the balance of air and fuel, which form the fuel-air mixture. It is this sensor that monitors what kind of mixture is formed - rich or too lean - and “transmits” this information to the ECU, on the basis of which further appropriate adjustments are made.

If the mass air flow sensor fails, then this whole chain collapses: the engine begins to act up, traction is lost, which ultimately can lead to complete engine failure.

Signs of a malfunction of the VAZ 2114 mass air flow sensor?

• Floating idle speed.
• Engine won't start.
• Increased “appetite” of the motor.
• Poor engine dynamics.

Three ways to check the sensor.

Method one: disabling the mass air flow sensor.

1. You need to disconnect the sensor and try to start the engine.
2. The controller is operating in emergency mode.
3. The fuel-air mixture is prepared taking into account the position of the throttle valve, about which the ECU informs the throttle position sensor.
4. We set the engine speed at 1500 rpm and try to drive a little; if the dynamics have improved and the acceleration has become a little faster, then the mass air flow sensor is faulty.

Method two: visual inspection.

The clamp attached to the air collector is removed from the corrugation. The surface of it and the mass air flow sensor is checked for traces of oil and condensate.

Method three (suitable only for modern mass air flow sensors) - how to check the VAZ 2114 mass air flow sensor with a multimeter?

The device sets a limit of 2 Volts.

The MAF pinout is as follows:

• a black and pink wire leads to the main relay;
• to the signal input – yellow;
• the green wire is grounding;
• white-gray wiring – voltage output.

Attention! Colors may vary depending on the sensor manufacturer.

Now turn on the ignition, but do not start the engine.

Connect the red probe of the multimeter to the yellow signal wire, the black probe to the green one.

The voltage at the output of the device can fluctuate between 0.966-1.01 V. Over time, this voltage can increase and the higher the value, the more faulty the mass air flow sensor. Now let’s take a closer look at the measurements themselves and what they mean:

• the sensor is working - the indicator is “0.1-1.02”;
• there is slight wear on the sensor – the indicator is “1.02-1.03”;
• the sensor will soon fail - the indicator is “1.03-1.05”;
• The sensor needs to be replaced - the indicator is “more than 1.05”.

Video.

The mass air flow sensor is a mass air flow sensor. It is located in the engine power system, in the intake tract, and is considered the most important among the main instruments and components in the injection system of any power unit. Like any other car component and any part, the mass air flow sensor can fail. Let's look at the main symptoms of a malfunction of the mass air flow sensor, and also find out the principle of operation and functionality of this equipment.

What is a DMRV?

This device is very necessary in order to determine the volume of air that fills the combustion chambers when the engine is running. The sensor is usually installed after the air filter in the power system.

When driving, the automobile power unit is supplied with 1 volume of fuel, as well as 14 equal parts of air. This prepares the correct fuel-air mixture. This is the key to proper operation of the motor in the most optimal modes for it. For any violation of this ratio, the car owner will observe either increased fuel consumption, or a decrease in the power of the power unit, or both. If you know the signs of a malfunction of the mass air flow sensor, it is easy to identify a breakdown of the device.

The mass air flow sensor is necessary in order to accurately measure the required amount of air. This amount is calculated in the sensor itself and then sent to the ECU, where, based on these data, the required amount of fuel will be calculated.

The more the driver presses the accelerator pedal, the more air enters the combustion chambers. The sensor records the amount and sends a special command to the ECU to increase the volume of injected fuel. If the car is to run or drive more smoothly, then a small amount of air will be needed. This is why you need a mass air flow sensor. It measures the required volumes of air for engine operation with maximum accuracy.

Measuring the volume of air means determining the load that will be applied to the motor. When you press the accelerator pedal, the throttle valve opens and the volume of air received increases.

How does the MAF work?

This device is a small wire made of platinum alloy. The size of this cord is only 70 microns. It is installed in a special tube, which is located in front of the throttle valve.

This wire is cooled under the air flow. To regulate the temperature between it and the air flow, electricity is applied to the wire. The charge level can be adjusted. The more the wire is blown, the more electricity is supplied.

Due to constant use, this wire is constantly covered in dirt. But modern sensors have a self-cleaning system. Dirt is one of the reasons why the device fails, but there are other signs of a malfunctioning MAF sensor. Although the design of the device is as simple and reliable as possible, it also fails. Its only drawback is that it is not suitable for repair. If the sensor fails, it is simply replaced with a new one.

MAF VAZ - signs of malfunction and diagnostics

If this sensor fails, the “Check Engine” light will most likely light up on the dashboard.

The motor will also definitely lose power and dynamic characteristics. Also among the main signs are increased engine appetite and difficulty starting the internal combustion engine.

Methods for diagnosing the air flow sensor

There are several options for checking the mass air flow sensor. Signs of a malfunction will appear almost immediately. Let's look at them together.

The first method is to disable the sensor

This verification method is the simplest. Every car owner can do it. The first step is to turn off the sensor. To do this, you just need to unplug the connector. Then you should start the engine. As a result, the ECU controller will go into emergency mode. And the supply of the fuel mixture will be regulated only using the throttle valve. Idle speed will be around 1500 rpm. After this, you need to check in by car. If the car has improved its dynamic acceleration characteristics, then it makes sense to look for signs of a malfunction of the mass air flow sensor.

The second way is using a multimeter

Before performing these diagnostic steps, it should be noted that this will only work with a Bosch mass air flow sensor. Before performing the test, set the limit on your multimeter to 2 V, and then switch the device to constant voltage operation.

Turn on the ignition and connect the red wire to the yellow one on the block. Connect the black wire to the green one. At this moment the engine should not be running. Measure voltage

If the reading is between 1.01 and 1.02, then everything is fine. The multimeter shows voltage up to 1.03 - there is nothing to worry about, this is acceptable. The limit level is 1.05. If it is higher, then you can again look for the cause of the breakdown.

External signs of a malfunction of the VAZ 2110 mass air flow sensor

This is the third way to diagnose the sensor. To determine its serviceability, carefully inspect the internal cavities of the air pipe where the mass air flow sensor is mounted. In order to do this, you will need a shaped screwdriver. Loosen the clamp and disconnect the corrugated pipe. The surface of the corrugation should be as dry as possible, without an oil film.

It should be noted that the main signs of a malfunction of the mass air flow sensor are dirt on the working surface. It is formed due to the fact that the air filter was not replaced in time. Oil deposits will tell the driver that the oil level in the lubrication system is high or that the oil cutter is not working properly. With these signs, the sensor may still work, but will soon fail.

Next you need to completely remove the mass air flow sensor. You will find signs of a malfunction after a visual inspection of the device. To carry out this operation, you will need a 10mm wrench. Unscrew the two screws and remove the device from the air filter housing. A rubber seal will come out with the sensor. If the seal remains in the body, this is the main sign of imminent failure.

Main symptoms

So. If you have problems with your mass air flow sensor, the signs of a malfunction can be very different. Among them are failures during acceleration, lack of traction, and decreased power. There is a persistent feeling that the car simply “does not go.” If there is no proper response when you press the gas, then this is one of the signs. High fuel consumption is also a signal for diagnosing this sensor. When your car stalls when shifting from gear to gear, it makes sense to check the MAF sensor. The VAZ 2110 has the same symptoms of malfunction as other cars.

If you have difficulty starting a cold engine, if the engine operation is unstable, if the speed spontaneously increases or, conversely, decreases, if detonation occurs under load - these are all signals for checking and diagnosing the sensor.

Cleaning the sensor

If you observe signs of a malfunction of the mass air flow sensor, then you can try cleaning the device.

By the way, this is the most expensive sensor of all in the line of front-wheel drive VAZ cars. But if yours is broken, don’t rush to change it. There is a small chance of restoring his “health”. For the cleaning process you will need a special liquid that is used to clean the carburetor. Star keys are also useful. Unscrew the clamp, as well as the two “10” bolts. Remove the pipe and take out the sensor. Spray the liquid onto the wire and tube. Work with extreme care, wait until this liquid has completely evaporated and leave the device to dry.

While the device is drying, remove the throttle assembly. You will see plaque inside the throttle assembly. It needs to be removed with liquid. This dirt causes problems with the entire system. Because of it, problems with the mass air flow sensor appear, signs of a malfunction of the VAZ 2115, which bother beginners on automobile forums.

Do not remove the throttle cable. Place the knot on a cloth and treat particularly dirty areas with the liquid. Don't forget to clean the idle air control valve and the space underneath it.

After this, most likely, all signs of problems with the mass air flow sensor will go away, of course, provided that the sensor has no mechanical damage. Therefore, do not wait until you have the first signs of such problems, but take such prevention this coming weekend. It won't take you much time, and your car will truly breathe. You won't recognize your engine. It will start much better, its traction will improve, and you will notice an increase in the power of your engine.

Carry out such preventive maintenance regularly, and your car will thank you.