VAZ 2110 16 valve dmrv. Repair and maintenance of the mass air flow sensor at Dvenashka

The mass air flow sensor for cars of the tenth family is installed between the air filter and the air duct leading to the throttle valve. The duration of the injector opening pulse, that is, the supply of a combustible mixture to the engine combustion chambers, depends on the accuracy of the mass air flow sensor. If the air flow sensor does not work properly, or if it is not hermetically installed on the filter and air duct, a deviation from the rated frequency of the engine is possible, and its power may also drop.

Replacing the mass air flow sensor on cars of the tenth family

Procedure for replacing the mass air flow sensor on cars of the 10th family

1. Disconnect a wire from the plug "-" of the storage battery.

2. Having pressed the plastic latch from the bottom with a screwdriver or finger, disconnect the block 1 with wires from the mass air flow sensor 3. Loosen the fastening clamp and disconnect the hose 2 from the sensor.
3. Turn away two screws of fastening and remove the gauge from the air filter.

4. Install the sensor in reverse order.

Types of mass air flow sensors installed on VAZ vehicles of the tenth family and a description of the principle of their operation (BOSH and GM)

Measures the amount of air taken in by the engine in kg/h. The device is quite reliable. The main enemy is moisture sucked in together with air. The main malfunction of the sensor is an overestimation of readings, usually at low speeds, by 10 - 20%. This leads to unstable operation of the engine at idle, stopping after power modes, and problems with starting are possible. An overestimation of the sensor readings in power modes leads to the "stupidity" of the motor, to an increase in fuel consumption.

Mass air flow sensor installed on cars of the tenth family

Rice. A - the appearance of the mass air flow sensor (item 2112-1130010) (manufactured by GM);
Rice. B - appearance of the mass air flow sensor (det. 21083-1130010-01 or 21083-1130010-10 manufactured by BOSCH); Rice.

DMRV, fig. A, (thermoanemometric type) has three sensing elements installed in the intake air stream. One of the elements detects the ambient temperature, while the other two are heated to a pre-set temperature that is higher than the ambient temperature.

During engine operation, the passing air cools the heating elements. The mass air flow is determined by measuring the electrical power required to maintain a given temperature rise on the heating elements relative to the ambient air temperature.

The controller supplies a reference signal of 5 V to the DMRV through a resistor with a constant resistance located inside the controller. The output signal from the DMRV is a voltage signal of 4 to 6 V with a variable frequency. High air flow through the sensor gives a high frequency output signal (speed mode). A low air flow through the MAF gives a low frequency output signal (idle).

DMRV, fig. B, (thermoanemometric type) has a sensitive element, a thin mesh (membrane) based on silicon, installed in the intake air stream. On the grid there is a heating resistor and two temperature sensors installed in front of and behind the heating resistor.

The MAF signal is a DC voltage that varies from 1 to 5 V, the value of which depends on the amount of air passing through the sensor. During engine operation, the passing air cools the part of the grid located in front of the heating resistor. The temperature sensor located in front of the resistor is cooled, and the temperature sensor located behind it, thanks to the air heating, maintains its temperature. The differential signal of both sensors makes it possible to obtain a characteristic curve depending on the amount of air flow. The signal generated by the DMRV is analog.

Checking the mass air flow sensor BOSH

1.Disconnect the sensor connector. Start the engine. Bring the engine speed up to 1500 rpm or more. Start moving. If you feel “playfulness” in the car, then this means that the DMRV sensor is faulty and needs to be replaced with a new one. This is the first test option. If the DMRV sensor is disabled, then the controller goes into emergency operation, so the mixture is prepared only based on the throttle position.

2. Turn on the tester in the DC voltage measurement mode, set the measurement limit to 2 V. Measure the voltage between the yellow “output” wire (closest to the windshield) and the green “ground” (3rd from the same edge) located in the sensor connector. The colors may change, depending on the year of production, but the arrangement remains the same. Turn on the ignition, but do not start the engine. Using the probes of the tester, penetrate through the rubber seals of the connector, along these wires, get to the contacts themselves without breaking the insulation. Connect the tester and take readings. These parameters can also be removed from the on-board computer display, if available. They are in the group of values ​​\u200b\u200b"voltage from sensors" and are designated U dmrv.
Rate the results. At the output of a working sensor, the voltage should be 0.996-1.01 V. During operation, it gradually changes upwards. By this parameter, you can determine the degree of "wear" of the sensor. For example: 1.01-1.02 V - the sensor is working, 1.02-1.03 V - the sensor is working, but already "planted", 1.03-1.04 V - it will need to be replaced soon, 1.04-1.05 V - it's time to change, 1.05 V and higher - operation is impossible, mandatory replacement.

Causes of a malfunctioning mass air flow sensor

Inspect the removed and defective sensor from the vehicle. Carefully inspect the sensor surfaces. They must be free of condensation and oil. The presence of oil or condensation is the most common cause of MAF damage. If they are, then the oil level in the crankcase is exceeded and the crankcase ventilation oil deflector is clogged. Before replacing the sensor with a new one. The problem should be corrected.

The video shows the symptoms of a faulty DMRV sensor on a VAZ. A non-working DMRV was specially installed:

Symptoms of a malfunction of the DMVR

Mass air flow sensor device

Signs of a malfunctioning mass air flow sensor can be direct or indirect. Consider all possible options:

1. . In most cases, the CHECK indicator lights up due to the failure of one of the sensors, so you need to connect to in order to accurately determine the malfunction.
2. Power drop is only an indirect sign, since there may be another reason for this malfunction.
3. Increased fuel consumption . Of course, everything can be attributed to the fuel pump, but the DMVR must also be checked. .
4. Decreased acceleration dynamics . The wrong amount of air mixture that enters the combustion chambers gives a bad incendiary mixture, which in turn does not and results.
5. Bad start or its impossibility . Rich or can not detonate normally, which will entail just such problems. And it is also possible that the fuel does not burn out and.
6. . A different amount of air entering the fuel mixture will give an effect when the speed will either decrease or increase.

To accurately determine the malfunction of the DMVR sensor, it is necessary to diagnose it.

How to check the MAF sensor?

The mass air flow sensor is checked with a multimeter

The mass air flow sensor is fairly easy to check. For diagnostics, you need a multimeter.

Voltage readings of a good and a faulty sensor

• 1.01-1.02 - the readings of the new sensor, everything is normal.
• 1.02-1.03 - there is wear, but the parameters are within normal limits.
• 1.03-1.04 - the parameters are working, but there is already wear.
• 1.04-1.05 - critical parameters, get ready for replacement, if there is money, then we change. Fuel consumption may be reduced.
• 1.05 and above- non-working MAF sensor.

Measurement with paper clips - there may be an error in the device. According to the testimony, it can be seen that the sensor "ordered to live long"

Alternative way to check

The second way to check the performance of the mass air flow sensor is to turn off the power from it and drive a few kilometers. If the engine performance has improved, then the problem is in the DMRV.

conclusions

It is quite easy to determine the malfunction of the mass air flow sensor VAZ-2112 16 valves. To do this, you need to know the direct and indirect reasons that contribute to the diagnosis, as well as to check in the most elementary ways.

For optimal operation of an injection internal combustion engine (hereinafter referred to as ICE), one should 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 conditions for supplying fuel. In addition to information from the mass air flow sensor, its pressure and temperature are taken into account. Since DMRVs are the most significant, we will consider their types, design features, diagnostic and replacement options.

Appointment and decoding of the abbreviation

Flow meters, they are also volume meters or DMRV (not to be confused with DMRT and DVRM), stand for mass air flow sensors, installed in cars with diesel or gasoline ICEs. It is not difficult to find the location of this sensor, since it controls the air supply, then 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 DMRV is out of order or absent, a rough calculation can be made based on the position of the remote sensing. But with this method of measurement, high accuracy cannot be ensured, which will immediately lead to excessive fuel consumption. This once again indicates the key role of the flowmeter in calculating the fuel mass supplied through the nozzles.

In addition to information from the DMRV, the control unit also processes data from the following devices: DRV (camshaft sensor), DD (knock meter), DZ, cooling system temperature sensor, acidity meter (lambda probe), etc.

Types of DMRV, their design features and principle of operation

Three types of volume meters are most widely used:

• Wire or thread.
• Film.
• Volumetric.

In the first two, the principle of operation is based on obtaining information about the mass of the air flow by measuring its temperature. In the latter, two accounting options can be involved:

Swirl sensor design (widely used by Mitsubishi Motors manufacturer)

Designations:

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

Wire gauges

Until recently, the filament DMRV was the most common type of sensor installed on domestic cars of the GAZ and VAZ model range. An example construction of a wire-wound flowmeter is shown below.

Designations:

• A - Electronic board.
• B - Connector for connecting the DMRV to the ECU.
• C - CO adjustment.
• D - Flow meter housing.
• E - Ring.
• F - Platinum wire.
• G - Resistor for thermal compensation.
• H - Holder for the ring.
• I - The casing of the electronic board.

The principle of operation and an example of a functional diagram of a filament volumemeter.

Having dealt with 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 a current passing through it, is placed in an air stream. 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 the King 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 a temperature T 1. 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 volume flow rate of the air flow:

Q \u003d (1 / K 2) * (I 2 * R T / (T 1 - T 2) - K 1)

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

Designations:

• Q is the measured air flow.
• U - signal amplifier.
• R T - wire thermal resistance, usually 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 resistance.

When the flow rate is close to zero, the RT is heated to a certain temperature by the current passing through it, which allows the bridge to be held 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 formed at the output of the amplifying unit, which partially passes through the thermal compensator, which leads to the release of heat and allows you to compensate for its loss from the air mixture flow and restore the balance of the bridge.

The described process allows you to calculate the flow rate of the air mixture, operating on the magnitude of the current passing through the bridge. In order for the signal to be perceived by the ECU, it is converted to 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 can accumulate on the wire thermistor, in order to prevent this, this element is subjected to short-term high-temperature heating. It is performed after the engine is turned off.

Film air meters

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

• temperature sensor.
• Thermal resistance (usually 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 channel geometry is designed in such a way that temperature measurements are taken not only from the input stream, but also from the reflected one. Due to the created conditions, a high speed of the air mixture is achieved, which does not contribute to the deposition of dust or dirt on the protective case of the crystal.

Designations:

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

As mentioned above, the principle of operation of filament and film sensors is similar. That is, the sensing element is initially heated to a 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 with filament devices, the output signal can be analog or converted to digital by an ADC.

It should be noted that the error of filament volumemeters 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 extended functionality of the ECUs that process information from these devices. These factors overshadowed the accuracy of instruments and their speed.

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

Interchangeability

This issue is quite relevant, especially considering the cost of original products of the imported auto industry. But everything is not so simple here, let's give an example. In the first production models of the Gorky Automobile Plant, a DMRV Bosch (Bosh) was installed on injection Volga. Somewhat later, imported sensors and controllers replaced domestic products.

A - imported filament DMRV manufactured by Bosh (pbt-gf30) and its domestic counterparts B - JSCB "Impulse" and C - APZ

Structurally, these products practically did not differ with the exception of several design features, namely:

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

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

Film DMRV Siemens (Siemens) for GAZ 31105

It makes no sense to bring a domestic analogue of the sensor shown in the figure, since outwardly it practically does not differ.

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 computer, and, in fact, the controller itself. In some cases, the control can be adapted (reflashed) to work with another sensor. This problem stems from the fact that most filament meters send analog signals, while film meters send digital signals.

It should be noted that the first production VAZ cars with an injection engine were equipped with a filament DMRV (manufactured by GM) with a digital output, as an example, models 2107, 2109, 2110, etc. can be cited. Now they are installed DMRV 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 interchangeability of DMRV for VAZ cars.

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

As a rule, there will be no problems with other brands of cars of domestic or joint production (UAZ Patriot ZMZ 409, DEU Lanos or Nexia), choosing a replacement for the DMRV will not be a problem for them, the same applies to products from the Chinese car industry (KIA Ceed, Spectra, Sportage etc.). But in this case, it is likely that the DMRV 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 R12, Renault Megan or other European, American or Japanese car, before replacing the DMRV, you must carefully weigh all the solutions.

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

In some cases, the search for an analogue will be justified, especially if we take into account the cost of a "native" volumetric meter (BMW E160 or Nissan X-Trail T30 can be cited as an example).

Health check

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

• The consumption of the fuel mixture has increased significantly, at the same time, acceleration has slowed down.
• ICE at idle runs with jerks. In this case, in idle mode, a decrease or increase in speed can be observed.
• 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.
• An engine problem message is displayed (Check Engine)

An example of the displayed message "Check Engine" (marked in green)

These signs indicate a possible malfunction of the DMRV, in order to accurately determine the cause of the breakdown, it is necessary to perform diagnostics. It's easy to do it yourself. Connecting a diagnostic adapter to the computer (if this option is possible) will help to greatly simplify the task, after which, by the error code, determine the health or malfunction of the sensor. For example, error p0100 indicates a malfunction in the flow meter circuit.

But if it is necessary to carry out diagnostics on domestic cars manufactured 10 years ago or more, then the DMRV can be checked in one of the following ways:

1. Testing while driving.
2. Diagnostics using a multimeter or tester.
3. External inspection of the sensor.
4. Installation of the same type, known to be working device.

Let's consider each of these methods.

Testing while driving

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

• It is necessary to open the hood, turn off the flow meter, close the hood.
• We start the car, while the internal combustion engine goes into emergency mode. Accordingly, a message about a problem with the engine will be displayed 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.

Note that you can drive further with the device turned off, but this is highly discouraged. Firstly, the consumption of the fuel mixture increases, and secondly, the lack of control over the oxygen regulator leads to an increase in pollution.

Diagnostics using a multimeter or tester

Signs of a DMRV malfunction can be established by connecting the black probe to ground, and the red probe to the sensor signal input (you can see the pinout in the passport for the device, the main parameters are also indicated there).

Next, we set the measurement limits in the limit of 2.0 V, turn on the ignition and take measurements. If the device does not display anything, it is necessary to check the correct connection of the probes to the ground and the signal of the flow meter. According to the readings of the device, one can judge the general condition of the device:

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

That is, it is possible to correctly judge the state of the sensor by voltage, a low signal level indicates a healthy state.

Visual inspection of the sensor

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

Inspection of the sensor for damage and presence of liquid

Typical signs of a malfunction are mechanical damage and liquid in the device. The latter indicates that the oil supply system to the engine has not been adjusted. If the sensor is heavily soiled, 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 sensor performance. In practice, this method is quite difficult to implement without purchasing a new device.

Briefly about the repair

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

In some cases, it is possible to repair the volumetric mass air flow sensor board, but this process will briefly extend the life of the device. As for 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.

MAF 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 vehicle component and any part, the DMRV can fail. Let's look at the main symptoms of a DMRV malfunction, and also find out the principle of operation and functionality of this equipment.

What is DMRV?

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

During movement, 1 volume of fuel is supplied to the automobile power unit, as well as 14 equal parts of air. This is how the correct fuel-air mixture is prepared. This is the key to the correct operation of the motor in the most optimal modes for it. With any violation of this ratio, the owner of the car will observe either increased fuel consumption, or a decrease in the power of the power unit, or both at once. If you know the signs of a malfunction of the DMRV, then it is easy to identify a breakdown of the device.

DMRV 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 this data, the required amount of fuel will be calculated.

The more the driver presses the accelerator pedal, the more air will enter the combustion chambers. The sensor detects the amount and sends a special command to the ECU to increase the volume of injected fuel. If the car will run or move more evenly, then a small amount of air will be needed. That's what the DMRV is for. It measures the required volume of air for the operation of the motor with maximum accuracy.

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

How does the DMRV 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 by 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 with dirt. But modern sensors have a self-cleaning system. Dirt is one of the reasons why the device fails, however, there are other signs of a malfunction of the MAF sensor. Although the design of the device is as simple and reliable as possible, it also fails. Its only drawback is its unsuitability for repair. If the sensor fails, it is simply replaced with a new one.

DMRV VAZ - signs of malfunction and diagnostics

If this sensor fails, the "Check Engine" light will most likely be on on the dashboard.

Also, the motor will definitely lose power and dynamic characteristics in its characteristics. Also among the main signs are increased appetites of the motor and difficult starting of the internal combustion engine.

Methods for diagnosing DMRV

There are several options for checking the MAF. Signs of a problem show up almost immediately. Let's look at them together.

The first way is to turn off the sensor

This verification method is the easiest. It can be done by every car owner. The first step is to disable 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 with the help of a throttle valve. Idling will be around 1500 rpm. After that, you need to make a check-in by car. If the car has added in the dynamic characteristics of acceleration, then it makes sense to look for signs of a malfunction of the DMRV.

The second way is with a multimeter

Before performing these diagnostic measures, it should be noted that this will only work with the Bosch MAF. Before testing, set your multimeter to the 2V limit, and then set the machine to constant voltage operation.

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

If the readings are from 1.01 to 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 higher, then you can again look for the cause of the breakdown.

External signs of a malfunction of the DMRV VAZ 2110

This is the third way to diagnose the sensor. To determine its serviceability, carefully inspect the internal cavities of the air pipe where the DMRV is mounted. In order to do this, you will need a curly 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 DMRV are dirt on the working surface. It is formed due to the fact that the air filter was not replaced on time. An oil coating will tell the driver about a high oil level in the lubrication system or about the incorrect operation of the oil separator. With these signs, the sensor may still work, but will soon fail.

Next, you need to completely remove the MAF. You will find signs of a malfunction after a visual inspection of the device. To carry out this operation, you will need a 10 key. 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 housing, this is the main sign of an imminent breakdown.

Main symptoms

So. If you have problems with the MAF, the symptoms of a malfunction can be very different. Among them, one can single out failures during acceleration, lack of traction, and a decrease in power. There is a persistent feeling that the car simply "does not go." If there is no proper reaction 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 stops when shifting from gear to gear, it makes sense to check the MAF sensor. VAZ 2110 has the same symptoms as other cars.

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

Sensor cleaning

If you observe signs of a malfunction of the DMRV, then you can try to clean the device.

By the way, this is the most expensive sensor of all in the line of front-wheel drive VAZ cars. But if you have it out of order, do not 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. An asterisk wrench will also come in handy. Unscrew the clamp, as well as two bolts on "10". Remove the pipe and take out the sensor. Spray the wire and tube with liquid. Work with extreme care, wait until this liquid has completely evaporated and leave the device to dry.

While the instrument dries, remove the throttle assembly. You will see plaque inside the throttle assembly. It must be removed with liquid. This dirt is the cause of the malfunction of the entire system. Because of it, problems with the DMRV appear, signs of a malfunction of the VAZ 2115, which bother beginners on automotive forums.

Do not remove the throttle cable. Place the knot on a rag and treat especially dirty areas with liquid. Don't forget to flush the idle air control and the area underneath.

After that, most likely all signs of problems with the DMRV 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 do such prevention this coming weekend. It will not take you much time, and your car will breathe for real. You won't recognize your engine. It will start much better, its traction will improve, you will notice an increase in the power of your engine.

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

But for their implementation, it is necessary that the sensors informing the controller do not deceive it - only under this condition the processes in the cylinders proceed normally, the engine develops sufficient power without consuming excess fuel and without causing great harm to the environment. One of these sensors measures the amount of air entering the cylinders and generates a corresponding signal for the controller. This can be an absolute pressure sensor (MAP sensor) or a mass air flow sensor (DMRV). We see the latter on many cars, including VAZ ones.

Malfunctions of the DMRV, of course, lead to one or another malfunction in the engine - jerks, failures, difficult starting, etc. - an incorrect estimate of the amount of air consumed in the cylinders turns out to be about the same as clogging the jets of a textbook carburetor. But it is sometimes not easy to “calculate” malfunctions in the DMRV, even with serious diagnostic equipment. In such cases, many act traditionally: they replace the suspected device with a known good one - but only on condition that the new one is of the same model. The fact is that on VAZ cars, depending on the year of manufacture and the type of controller, you can find different DMRVs.

The first was a frequency MAF of the GM control system. It was also used in the domestic analogue "January" of the 4th series (photo 1). Cars of this configuration did not last long on the conveyor - the frequency sensor was replaced by the analog model HFM-5 from Bosch - its number is 0280218004 (photo 2). It is not interchangeable with GM - connectors and mounting points are different. The German sensor is collapsible, from two parts - the body and the measuring element. The latter is fixed in the case with two screws with "secret" heads. True, now in auto parts stores you can buy the necessary tool. The measuring element is a compact thing, but it is expensive - in Moscow from 1300 rubles. and higher. Having removed this part from a new car, in return, what good, they will put a dummy, and everything that follows is the “personal grief” of the car buyer. The market is full of such “DMRV without a housing” ... It is unreasonable to buy a measuring element without a housing: it is very possible that it is faulty or not of the model that is needed. Bosch only sells complete sensors in traditional yellow carton packaging. Recall that a store bought a DMRV of the “wrong system” may not accept it back if the motorist does not provide a certificate from the service, and it is often not easy to get it. An unnecessary expensive knot will remain as a keepsake.

The third version of the DMRV is the 037th. (Here we are talking about the last three digits in the designation.) This is a further development of the Bosch 004 sensor. Such a sensor is today on most VAZ cars traveling on the roads, including Niva and Chevrolet Niva. Outwardly, the 004th and 037th are almost indistinguishable - be guided by the number (photo 3). Recently, additional markings have appeared on products: now the numbers are on both the body and the measuring element - they must match. The main difference is inside the DMRV. In photo 4 on the right is the 037th sensor. It has a different design of the measuring element, with a characteristic cutout (when buying, it makes sense to remove the plug and look inside).

But now a new control system has appeared - Bosch-M7.9.7, which has its own, 116th, DMRV. It is not interchangeable with the previous ones, although its body is the same. To avoid confusion, a green circle was originally applied to the hull (photo 5). There are numbers both on the body and on the measuring element (photo 6). The latter determines the purpose of this DMRV - the design has been changed again (photo 7). To prevent the elements from being replaced on the way from the factory to the consumer, good German designers supplied other secret screws. Oh, naive! The necessary tool is already on sale in the Russian market. Carefully inspect the DMRV: unscrewing secret screws, their coating, as a rule, is damaged. Noticed - draw conclusions!