Indications of the mass flow sensor VAZ 2114. Basic signs of DMRV malfunction (VAZ)

To ensure more efficient and sustainable operation of any modern engine, a variety of different devices are used. One of these is the mass flow sensor (DMRV), in particular, it will be about cars VAZ 2114. Read more about features, faults, diagnostics and cleaning controller read below.

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DMRV functions

What is DMRV VAZ 2114 and what functions does it perform? The primary task of the regulator is to create spheres from air and fuel vapor.

The regulator can measure two parameters related to each other, namely:

• reaction time;
• the volume of used air.

In accordance with the information received, the correctional device determines the required volume of components to create a mixture. When issuing incorrect data, the mixture will not be able to correspond to the mode of operation of the power unit, respectively, its power can decrease, and the fuel consumption is growing.

Optimal air flow

If the mass flow sensor of the air is operational, then when the motor operating at 900 rpm, the amount of air used will be at least 10 kg per hour. With increasing revolutions up to 2 thousand, this indicator will increase in about 20 kg. If the air volume on such revolutions falls, the vehicle dynamics will decrease, respectively, it will lead to a decrease in gasoline consumption.

If these indicators are increased, it will contribute to the increase in fuel volume. In fact, the deflection of the parameter by 2-4 kg should not be allowed, since in this case the operation of the power unit may be incorrect.

Causes of faults

The mass flow sensor can be broken not only because of the problems in the ventilation of the motor crankcase. The ventilation system itself in the VAZ 2114 is a two-door, it is responsible for the work of the engine in a closed or open throttle mode. With a closed scale, the gases from the crankcase go through the highway, but at the same time some of them remains in the idle highway. Gas can come into contact with the DMRV resistor on the VAZ 2114, and as a result of the fact that resin accumulates on its body, the device may produce incorrect data. Accordingly, this leads to various faults of the regulator (video author - KOSSS102).

Diagnostics breakdown

If the air flow sensor breaks, the signs of malfunction can be the most different. First of all, the fuel consumption will increase, another symptom can be floating turnover of DVS.

In addition to these signs, damage can be allocated as follows:

• failures in the work of the power unit;
• slower overclocking auto, bad dynamics;
• the power unit can be turned off when switching speeds;
• reduction of power and increase in gasoline consumption;
• heated internal combustion engine is more difficult to start;
• the appearance of the Check light bulb on the control panel.

The last sign may not be manifested with the full failure of the controller. How to check the DMRV on their own? The diagnosis is to identify the impulse.

In the event that the impulse will be reduced, this indicates:

• possible closure or wiring breakage;
• failure of the regulator;
• incorrect work of the ECU;
• oxidation of contacts;
• the controller is not connected.

Features check

To understand how the DMRV is checked, first find the device located in the engine compartment. On VAZ 2114 cars, the regulator is located on the air filter highway. How to check the sensor with your own hands?

First, the controller must be turned off from the network, for this click on the mounting of the wires. Get the engine let him work a little. You need to drive a little by car - if it will accelerate faster than usual, this indicates the failure of the controller.

The diagnostic procedure can be implemented by replacing the firmware of the control unit. There is a small emphasis on the throttle, it is necessary to put a plate under it, its thickness should be about 1 mm, due to this it will be possible to increase the rev. Then the power of the regulator is also disconnected, the motor must be stumbled at the operation device (the author of the video - Vanechk 01RUS).

Instructions for cleaning

As practice shows, Cleaning DMRV is one of the most effective methods for restoring the controller. Therefore, when the sensor fails, it is not necessary to change it, especially since such pleasure is not cheap today. Such a procedure is needed because over time, it is contaminated and shows other parameters.

So, how to clean the DMRV at home with your own hands:

1. You will need a screwdriver with a crusade, with its help you need to weaken the clamp, fixing the highway from the air intake.
2. Next, make a disassembly of corrugations and visually evaluate the system status. Perhaps under the corrugation you will see condensate or traces from the engine fluid.
3. Carefully inspect the inner surface of the controller. If everything is fine with the system, there will be no traces of flows or contaminants. As practice shows, the sensitive element is often breaking precisely because of the oversupply of pollution. In order to avoid problems of such a plan in the future, it is necessary to periodically replace the air filter. This procedure is carried out in accordance with the Technical Regulations. Motor fluid can fall on the controller as a result of an increased level of consumable material in the crankcase. Accordingly, this occurs as a result of clogging of the oil separator in the ventilation system.
4. The regulator itself is fixed on two bolts on the highway. The removal procedure is carried out using a horn key. At this stage, if you are confident that the device has failed, it can be replaced.
5. You can see the input on which there will be a sealing gum designed to protect the device from the dirty air flow. In the event that you do not have a seal, it may be caught by the filter element. Accordingly, this will lead to the fact that the input grid of the regulator will be contaminated.
6. Clean the mesh using sweater. To do this, you can use a conventional toothpick or toothbrush. After cleaning, the seal can be installed back, and regulator put in place.

Sorry, currently there are no accessible surveys.

Video "Right Cleaning DMRV at 2114"

A detailed instruction is given on video (video author - IZO))) Lenta).

A mass flow sensor (DMRV), is one of the key elements of the mixing system and supplying the car VAZ 2114 fuel. Its main function is to determine the amount of air entering the cylinders. This device is located, in the intake system, immediately after the air filter.

Principle of operation

For the normal operation of any gasoline engine, it must be provided, a specially prepared mixture of gasoline and air, in proportion 1:14, respectively. On older car models, a carburetor was used for this feature. He had a lot of small holes in his device, which were constantly clogged with garbage, and the engine stopped working. To eliminate such a malfunction, the holes needed to be cleaned.

Over time, the designers came up with a more perfect way to form a mixture, which was based on a mass flow sensor. It works in a pair with an on-board computer, which provides gasoline. Sensor, calculates the perfect amount of air, to obtain a mixture, and transmits data on the on-board computer, which further performs the operation of the mixing formation.

An increase or decrease in fuel supply and air, directly depends on the press on the gas pedal. Inside the DMRV VAZ 2114, there is a plate, a diameter of 70 mm, which plays the role of the meter. During the work of DMRV, it is constantly contaminated. So, in order for the malfunction, when the engine is started, the mass flow sensor heats the plate to a high temperature, and thus cleaning its cleaning.

Principle of operation of the device

Fault

Although the air flow sensor is considered rather reliable, it does not avoid malfunction, and then it may be necessary to repair or replace it. In order to understand: a broken sensor, or not, you need to know the main signs of its malfunction.

About DMRV breakdown, a significant disruption of idling, as well as a lack of smooth overclocking. Checking the device in these symptoms is made by a sharp press on the gas pedal. If the car hurts, and the speed will start, then the reason in another node, and if it just stalls, then most likely the sensor layer, and it needs cleaning or replacement.

The following signs of the DMRV breakdown are incorrect flow meter readings on the onboard computer. Stripping from how the flow rate of the VAZ 2114 from the factory can conclude that the flow rate is increased during the movement, or not. When preparing an irregular mixture, the on-board computer, respectively, will read incorrect information. This happens in cases where the standard cleaning of the device leads to the burden of the plate. In this case, the device will need to be replaced.

On this, the signs of the sensor malfunction do not end. About the breakdown of this device, also, the burning light bulb - "Chek-Endin" may also testify. Of course, it lights up not only with this malfunction, but, its work should be considered as an option.

In order to be 100%, which is broken by DMRV, you need to check it with a multimeter. This check is made as follows: I remove the sensor from the fuel supply system, turn off the wires from it, and insert the plus wire of the multimeter. The minus wire of the device must be applied to the engine, on the "mass". Next, we look at the instrument readings. If its scale gives at least some signs, then the sensor is working, and if nothing changes on the scale, then, undoubtedly the reason in it, and it needs a replacement.

Outcome

Despite the simplicity of the DMRV device, it is urged, it is not strongly recommended to carry out its cleaning, replacement or verification yourself. The cost of a new such device, rather notable, and in the event that you install it incorrectly, it will instantly closed, and will be unusable. Therefore, this work is better to entrust professionals.

Checking the sensor should also be carried out under the control of the wizard, as it includes the removal of the device, and its reverse installation. That's all, now, with similar symptoms of the engine malfunction, you will know about the option with a breakdown of DMRV, and that is not very important, to eliminate it on time.

Almost every VAZ 2110 owner (as well, and the owners of later VAZ 2112, VAZ 2114, VAZ 2115, etc.) faced problems related to the abnormal operation of the mass flow sensor (DMRV). Even a minor increase in the error issued by this testimony sensor can seriously disrupt the activities of the central controller, which, in fact, on the basis of this air flow information, controls the nozzles and the ignition system. As a result, the engine loses part of its power, the average fuel consumption increases, dynamic indicators deteriorate, and the amount of CO in the exhaust gases increases. Meanwhile, frequent DMRV failures are explained not only by the low reliability of this element (although the sin is to tate, the overall quality of DMRV domestic production also wants to be better), but also the constructive features of the Russian auto industry products. The fact is that with the currently accepted two-circuit engine cooling system of the engine crankcase, under certain conditions, part of the spent gases passes through the idling line, in parallel to the sensing element of DMRV, determined harm causes a oscillatory return of gases in the inlet path. If you remember the quality of our gasoline, it becomes clear that it takes quite a bit of time so that resin sediments can appear on the sensor elements that can change the sensor characteristics and even completely output.

If you act within the framework of the rules, in case of suspicion of DMRV failure, it is more correct to fulfill it with a special diagnostic device, such as DST- 6, however, if you wish, you can go on a simpler path and dispensed by a publicly available digital multimeter (tester ) With the measurement limit 2B. In order to perform the check, we need to get to the sensor signal wires without turning it off and make it possible to enter thin probe or ordinary needles under the rubber seals directly to the terminals. When checking, the voltage is measured between the yellow wire of the output signal (as a rule, it is located closer to the windshield) and the green wire "Mass". Having achieved a reliable contact, we turn on the ignition is not launched, with the engine. For a normal sensor, the measured voltage should be ranging from 0.996V to 1.03V. If the voltage is higher, then you should look for an output from the situation, namely changing the sensor or still try to restore it. The new DMRV sensor is not so small, but if we consider that out of 10 sensors subjected to "resuscitation", about eight sensors restore their characteristics, then an attempt to extend the life of DMRV looks quite justified.

By and large, all recovery operations consist in simple disassembly and washing the most significant elements of the sensor and, in particular, its sensitive membrane.

Before proceeding with this work, it is necessary to firmly assimilate that the sensitive element of the DMRV sensor does not tolerate physical impact, which means it is recommended to forget about any tampons, matches, tassels, etc. very carefully treat the selection of detergent, as many solvents, There may be irreparable harm to subtle contacts on the membrane, which are fixed using a special resin. Be that as it may, as a detergent, without special feet, you can use a carburetor cleaner or ordinary alcohol.

Performing preparation for cleaning will need to be removed from the DMRV nozzle, for which it is necessary to need a set of keys of stars to turn off the cunning screws (in subsequently, they can be replaced with ordinary, under the cross). After removing the nozzle, an assessment of the state of the sensor is made and, as a rule, at first glance, the surfaces covered with an oil column are visible. Flushing is carried out with a jet of detergent to the upper channel of the measuring element. For reliability, this procedure can be reused, waiting for the complete drying of the pre-applied fluid.

After flushing the sensitive element of the sensor, do not forget to carefully clean the filter of the nozzle.

After completing the recovery procedures, the sensor is collected, installed in place and again check the values \u200b\u200bissued to them.

The mass flow sensor (DMRV) can be characterized by two main parameters.
The first is the number of air passed through it, the second is the reaction time. Various controllers in different react to these parameters. If the DMRV will slightly underestimate or overstate his testimony, for example, the controller "January-5.1", using the oxygen sensor, will be able to track this error and adjust the duration of the injection. The BOSCH MP7.0 controller reacts more sensitively to this error, which leads to unstable idle turns. If the controller does not have an oxygen sensor in feedback, then you can compensate for this error in the adjustment of the injection coefficient. This will help solve the problem only for a while.
If DMRV will have a great response time, then the "January-5.1" controller will not be able to track the beginning of the change in the amount of air flow and on the operation of the machine and this will express as a "failure" at the time of overclocking. With the BOSH MP7.0 controller, this effect will be expressed weaker, due to the presence of adaptation programs to the sensor.
One of the DMRV diagnostic techniques is to check the sensor on idling mode and in the mode of a sharp set of revolutions at a fixed machine. Controlled sensor, usually, scanner. A good sensor, at idle, should show 8-9 kg / h and with a sharp set of revolutions Maximum values \u200b\u200bmust be more than 220kg. The higher the testimony gives the sensor, the better.

The disadvantage of this method is the fact of the need for a rather sharp pressing of the gas pedal with a diagnostic, which requires a certain skill. With a smooth rotation set, the sensor goes to normal readings, but it remains faulty. It turned out that for the sensors of the company BOSHH, there is a direct relationship between the response rate and the transition time when the power is applied to the sensor itself. Also, the voltage after the transition process indicates the deviation of the testimony of the past air from the norm. For a good sensor, these parameters must be 2-20ms during the transition process and * 1.03V after it. Moreover, the smaller the transition time - the better. Any deviation from 1.03V in a large or smaller side is a deviation from the norm.

Note: * 1.03B - Such voltage will be in case the measurement is performed relative to the car battery. It is more correct to measure relative to the ground of the sensor. In this case, the device will show 1B. But this method is less convenient in the connection, therefore, usually the measurement is carried out relative to the battery and make the appropriate correction.

DMRV - a capricious sensor- because it is too vulnerable and at the same time practically not amenable to diagnosis. The method described in the manual (to decrease the testimony at the XX and 3000 RPM) does not give satisfactory results. Really, at suspected malfunction, DMRV remains one thing:

Act "Tyk Method" - to see what will change when installing a well-good DMRV.

The car has become constantly shy ??? It is clear that with such behavior, the DMRV is most likely to blame. Under this case without hesitation, you need to find and install a new sensor.

1) DMRV is still not amenable to the diagnosis of semidia methods: (Diagnostics "CE" When the DMRR is output, it is rather an exception than the rule.

2) I am increasingly strengthened in the opinion that the problem is often discussed here: the engine is stalling - in many cases caused by the malfunction of DMRV.

3) DMRV must be protected. The inferior enemy is the air past the filter, in this case the DMRV lives a maximum of 2..5 thousand km. To avoid this, you need to eliminate the leaks between the filter body and DMRV. Also possible is possible due to the curve of the filter itself inside the case. Hu and, it is clear that the quality of the filter is important. If the air sawmaker is all safely, it is believed that it gives the right testimony for about 20 thousand km. After that, it starts to lie - the dynamics worsen, the flow rate is growing, there is a difficult launch. The second enemy is crankcase gases, reaching DMRV.

I will be glad if these my considerations will allow someone to save time, nerves and money.

Diagnosed DMRV is very simple: insert the pin between the rubber seal and the yellow wire in the DMRV contact and feed the voltage. Ideally - 0.99V. Well, plus the error + -0.04B. If the voltage is more than 1.03 - DMRV died.

And how does the controller itself diagnose DMRV? In other words, dead DMRV will be wonderfully detected by the controller on its own. Moreover, he will do it better: you can measure the device once, and the controller does it (conditionally) constantly, therefore it is able to "catch" and a short-term dobessing, contact disappearance, etc.
Fully faulty DMRV is diagnosed easily: and measurement of voltage, and withdrawn by the diagnostic device, etc. The trouble is that completely defective DMRV is a rarity. It happened to the diagnosis of "CE", mostly the car does not eat and poorly started.
In real life, faulty DMRV available in the ways is most often not diagnosed.

Modern car engine is a high-tech complex of complex design, and this unit "Food" with various electronics. A variety of sensors who follow his work and many associated with it, elements, there are a large amount, therefore, when it comes to diagnosis and repair, many simply do not know where to climb and what exactly needs to be checked. However, not everything is so difficult, as it may seem at first glance: almost all sensors are subject to checking and replacing, not exception and. In this matter, the main thing is to know how and what to do.

But before you tell you how to check the DMRV VAZ 2114, I wanted a couple of words to say about himself. Just so, it will be easier for you to deal with the information presented below.

So, the main task of DMRV is the implementation of control over the balance of air and fuel, which form the fuel and air mixture. It is this sensor that tracks which the mixture is formed - enriched or too poor - and "transmits" this information into the ECU, on the basis of which the further adjustment is carried out.

If DMRV fails, then the whole chain collapses: the engine begins to clutch, the thrust disappears that ultimately can bring the engine to the complete failure.

Signs of malfunction DMRV VAZ 2114?

• Floating idle speeds.
• Not a launched engine.
• Increased motor appetite.
• Poor engine dynamics.

Three ways to check the sensor.

Method One: Disconnect DMRV.

1. You need to turn off the sensor and try to start the engine.
2. The controller works in emergency mode.
3. The fuel and air mixture is prepared, given the position of the throttle, which the ECU informs the sensor of its position.
4. The rotation of the engine is set at a mark of 1500 rpm and we try to drive a little if the speaker has improved, and the acceleration has become a slightly more jerky, which means the air consumption sensor is faulty.

Method Second: Visual verification.

Corrugations are dismantled by a homethrium attached to the air collector. The surface of it and the DMRV is verified for the presence of traces of oils and condensate.

The third method (suitable only for modern air consumption sensors) - How to check DMRV VAZ 2114 multimeter?

The device is set to 2 volts.

DMRV pickup is such:

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

Attention! Colors can be different, it all depends on the manufacturer of the sensor.

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

Red multimeter probe connect to yellow signal wiring, black probe - to green.

The voltage at the output of the device may vary in the range of 0.966-1.01 V. Over time, this voltage may increase and the more the indicator will be, the fact of the DMRV. Now more about the measurers themselves and that they indicate:

• the sensor is correct - the indicator "0.1-1.02";
• there is a slight wear of the sensor - the indicator "1.02-1.03";
• the sensor will soon fail - the indicator "1.03-1.05";
• replacement of the sensor is required - the indicator "more than 1.05".

Video.