DMRV is called a device that can determine the exact amount of air visiting the vehicle motor. With the help of DMRV, you can control the filling of cylinders with mixtures. Such a device is considered one of the most important in the injection system, and its use began almost instantly after its creation. The location of this device is an intake path, and more precisely, it is located this sensor between the inlet and the air filter.

How DMRV works

In one period, the position of the number of encomparable fuel to the air is 1/14. Only under such conditions the motor can work optimally. In the event of problems, there is a combustible overrun or reduction of engine power.

A mass flow sensor fuel freezes the air received and transmits this data to the ongoing computer, which determines how much fuel must be highlighted by the motor.

The driver can control the number of air that comes. If you press the gas pedal stronger, more air will fall. Thus, with good operation of the sensor, the gasoline will also be greater. Therefore, it is always worth going calmly and without jerks, it will provide a small air flow A, respectively, and gasoline.

Design DMRV

As for the design of the mass flow sensor, the measuring tube contains a platinum wire, which has 70 microns in diameter. Immediately in front of it is the throttle valve. Works mechanism on the principle of temperature constancy. Today, a variety of sensors are presented on the market, which differ in their design and the method of determining the amount of air.

As for the platinum wire, then in the old days he was polluted after work. Whatever it is to avoid, developers supported support for the wires of the wires directly into the electrical control unit. When the motor is turned off, throughout one second, its surface is heated to a thousand degrees Celsius, together with all the contaminants are removed. Unfortunately, the air flow sensor is practically not amenable to repair or recovery, for this, when breakdown, you have to change all the equipment to the new one.

Signs of malfunction DMRV

In fact, it is not difficult to understand that the sensor is not so difficult, I propose to consider signs of a mass flow sensor fault:

1. Check Engine appears on the dashboard. However, it testifies not only about problems with DMRV, as well as about other faults.

2. If driving dynamics disappeared.

3. If the fuel consumption has risen.

4. If "horsepower" decreased.

5. If there are problems in the operation of the heated motor.

However, this is not all. The need to clean the air flow sensor may be required in other cases. For example, by ventilation of the engine crankcase, the oil can fire and disrupt the operation of the sensor due to the air filter or the air duct.

In addition, the device has some sensitive zones, the ingress of dirt on which can provoke incorrect operation of DMRV. Although manufacturers are trying to develop a system without collecting dirt and resistant to different temperatures, there are still cases.

Today, the market shows a lot of variations of air flow sensors, and if it is accurate, then they are about 50. So, there is from what to choose from.

Bulk flowmeters DMRV

The base of mount is the Pito tube, it is distinguished by the presence of a thin plate in the center, which is capable of bending using the air flow and is very gently fixed. The potentiometer registers its bends by changing the resistance indicators. With the potentiometer indications, the control unit collects data and selects the required amount of fuel.

DMRV with thermometric meters

This option is more relevant and common than the previous one. The apparatus is based on the heat exchanger to which two plates are attached from platinum, which is passed to the current. One of the plates is a worker, and the second is backup. The temperature in one of the plates in any case should be higher than the other. Therefore, one of them is cooled all the time in the flow of air, so far to align the temperature. For this, a large number of current is supplied to the non-working plate. It is these indicators that affect the response of the control unit and allocate the optimal amount of fuel. If, in case of checking a multimeter, the signal level will be low, it is a very bad feature.

It is worth saying that most recently there were mass flow sensors with film meters (silicon plates with platinum spraying) on \u200b\u200bthe market (silicon plates with platinum spraying), however, did not have time to get their popularity.

How to check the work of DMRV

I propose to consider several options for checking the air consumption sensor.

Option first. You must turn off the motor and on the on-board system, disconnect the sensor connection connector. If the motor is turned on, the system will work in an emergency. Since then, the revolutions of the air supply are not as important as the position of the throttle. After disconnecting the air consumption sensor, start moving the vehicle. In case of increasing the dynamics, the sensor breakdowns should take more seriously.

Option second. This check will be produced by the visual method. It is necessary to see if there is no dried oil, liquid or contamination. If you find something like that, it is necessary to immediately clean the equipment and eliminate the problem with the leakage of oil.

Option third. In order to accurately check the condition of the mass flow sensor of air required to be equipped with a multimeter. Adjusting the DC voltage measurement should be 2 V. Multimeter must be connected to yellow and green wires, however, often their colors may be completely different, therefore it is important to know the sequence of connectors: 1 and 3.

Option fourth. If the motor is disabled, but the ignition is included, the voltage of the mass flow sensor of the air should be 0.996 - 1.01 V. In case of exceeding this value, you can expect disabilities, since, very often, the air consumption sensor can be thrown if the voltage reached 1.05 in .

After diagnostics, you can safely start repairing DMRV.

Repair DMRV and cleaning

I would like to immediately warn readers that the opinions of professionals, about the use of this procedure, quite different. Someone believes that it is capable of harming even more, and some are confident that it is absolutely safe and useful.

It is also worth saying that the following elements are prohibited:

1.What sticks.

2. Compressed air.

3. Acetone.

4. Esters.

Remember that only specialized detergents are required to clean such structures.

First you need to remove the nozzle. Unfortunately, without this it will not be possible to clean the sensor correctly. You need to unscrew all the screws, bolts and remove the sensor from the nozzle. At the same time, you can see a lot of oil on the surface of the nozzle. In our case, it is not bad since now the chances of repairing the device independently, without buying a new one, and it is expensive, about 2000 rubles. Next, you need to sprinkle with a special fluid of several wire sensors that keep a resin.

Now you need to wait until it dry and, if necessary, make this process again. In the absence of special detergent liquids, an ordinary alcohol can be applied. When the sensor is cleared, you need to pay attention to the mesh of the nozzle and its surface. Then, we produce a replacement of the air filter and collect all the details back.