Dmrv vaz 2112 sixteen valve. Repair and maintenance of the mass air flow sensor at Dvenashka

11.10.2019

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 analogs, 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 analogues. 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:

Testing while driving.
Diagnostics using a multimeter or tester.
External inspection of the sensor.
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.

Today I decided to share with you one useful information, maybe it will be interesting to someone, and it will really come in handy in case of a real malfunction on the car. An air flow meter is installed on the VAZ 2112 16 valves, the role of which is to measure the amount of air that enters the engine. Indeed, the stable operation of the power unit depends on the correct ratio of the mixture (gasoline + air), which burns in the cylinders. And in general, fuel consumption. You can check the health of this unit yourself at home, without stopping by the service station.

How to check

Method number 1: Disable the DMRV.

Disconnect the sensor connector and start the engine. If you turn off the DMVR, then the controller switches to emergency operation and prepares the fuel mixture only according to the throttle position. The engine speed must be over 1500rpm.

Let's try to ride. If it feels like the car has become “faster”, then we can say that the DMRV is not working.

By the way, for ECU Ya7.2, M7.9.7. turns when turning off the chips do not rise!

Method number 2: Alternative ECU firmware.

If the standard firmware of the controller was replaced with another, then it is not known what is sewn in it in case of emergency mode in method No. 1. Try putting a 1mm thick plate under the damper stop. The turnover will go up. Pull the chip from the DMRV. If it doesn’t stall, then the matter is in the firmware, or rather with the IAC steps in emergency mode without the DMRV.

Method number 3: Checking the DMRV with a multimeter.

This method works on Bosch sensors with catalog numbers: 0 280 218 004, 0 280 218 037, 0 280 218 116.
We turn on the tester in the DC voltage measurement mode, set the measurement limit to 2 Volts.

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!

Modern VAZ 2112 cars are equipped with various devices and sensors that ensure optimal engine operation. If one of the main components fails, this will negatively affect the functionality of the machine as a whole. For more information about what 2112 is, where it is located and how to clean it if necessary, read this article.

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Characteristics and features of the DMRV on the VAZ of the twelfth model

DMRV or mass air flow sensor is a device whose purpose is to assess the volume of air flow entering the motor of the machine. This controller is one of the main devices of the electronic control system of the power unit. Failure of the DMRV will lead to unstable engine operation.

As for the location, this device is located behind the air filter element housing. To find the device, open the hood of the car and find the air filter housing, right behind it is the DMRV. The operation of a car with a faulty controller may be difficult or impossible (the author of the video is Sergey Marunchenko).

Possible sensor malfunctions

There may be several device malfunctions:

the sensor is clogged with dirt;
mechanical damage to the device;
lack of contact, that is, damage to the power supply wiring of the device.

The main symptoms of controller failure:

The check indicator appeared on the control panel. As practice shows, this lamp most often lights up when the controller breaks down, so to determine the malfunction, you need to connect to the electronic control unit.
Reduced engine power. Of course, this symptom is indirect, since a decrease in power may be due to various malfunctions, but, nevertheless, it cannot be ignored.
Increased fuel consumption. Such a problem can also be attributed to the failure of the fuel pump or fuel filter, however, the performance of the DMRV must also be checked.
In addition, the acceleration dynamics of the car will be reduced. As a result of less air entering the combustion chambers, the quality of the air-fuel mixture as a whole will be lower. Accordingly, because of this, the car cannot accelerate normally. And if you step on the gas, then when accelerating, the VAZ 2112 can move jerkily.
Poor starting of the engine, in more severe cases, the engine will not start at all. This, again, is due to a poor-quality combustible mixture. Such a mixture can cause detonation, which contributes to poor engine starting. In addition, uncharacteristic pops can be heard from the exhaust pipe.
When the car is idling, the engine speed will float. This problem is due to the different volume of air flow that enters the combustible mixture (the author of the video is Sandro's channel in the garage).

Checking the regulator for performance

There are several options for diagnosing the device.

To use a tester (multimeter), you will need to perform the following steps:

First, the plug must be disconnected from the power supply of the device, after which the multimeter probes are connected to the device. The red output must be connected to the yellow contact, and the black output to the green, that is, to ground.
After performing these steps, the DMRV will operate in emergency mode, and the air flow will be dosed according to the latest parameters. When diagnosing, the multimeter should display voltage parameters on the display.
The operation of the device is allowed if the voltage parameters are from 1.01 to 1.03 volts. If the obtained indicators are 1.04 volts and higher, then this indicates that the device is already wearing out or completely out of order. With such parameters, the device should be replaced as soon as possible.

There is another option for checking - alternative. To do this, simply unplug the power plug from the controller, start the car engine - you need to drive. If you notice that when the controller is turned off, the operation of the power unit has become more efficient, then the cause of the malfunction lies precisely in the sensor.

Troubleshooting methods

You do not have many options for solving the problem - you can either try to clean the sensor or replace it with a new one.

The cleaning and replacement procedure is described below:

First you need to dismantle the DMRV. To do this, loosen the bolt that secures the corrugated hose to the device body, then disconnect it.
Next, you need to unscrew two more screws, with which the DMRV is fixed to the air filter housing. Having done this, you can dismantle the controller. If you decide to change it, then you will just need to install a new DMRV, and reassemble in the reverse order. But if you want to try to restore its performance, you can clean the device.
After dismantling the regulator, it must be disassembled. There are coils on the device, so when dismantling the regulator, be careful not to damage them. As practice shows, these spirals are very sensitive, there are even cases when car owners, simply by wiping the DMRV with a rag, put it out of action.
Now you will need a special tool for cleaning carburetors, which can be purchased at any store. Before cleaning, make sure that the pressure from the cylinder is not strong, as excessive pressure can also damage the device. The body of the device itself should not be heavily processed, since the plates and spirals are most contaminated, so these components need to be processed as much as possible.
It should be noted that this process should be carried out in several stages. The bottom line is to allow the device to dry a little after processing - this will allow the dirt to sour as much as possible. The procedure must be repeated several times with a short interval, eventually the DMRV will need to be washed. The cleaning process itself is repeated until transparent, clean drops of cleaner begin to flow from the sensor. Then you can mount the device in place by assembling all the components in reverse order.

Photo gallery "Cleaning the DMRV"

Video "Visual instruction for cleaning the DMRV"

A more visual instruction for cleaning the controller is given in the video below (the author of the video is the IZO))) LENTA channel).

Dear customers, in order to avoid errors when sending the mass air flow sensor (MAF), in the "Comment" line, indicate your car model, year of manufacture and the number of valves.

Mass Air Flow Sensor (DMRV) 037 " BOSCH" – hot-wire type.

Structurally, this type of sensorshas a sensitive element, a thin mesh (membrane) based on silicon, which is installed in the intake air stream. On the grid there is a heating resistor and two temperature sensors, which are installed before and after the heating resistor.

The output signal of the DMRV is a DC voltage in the range of 1 ... 5 V. The value of which depends on the amount of air passing through the sensor. While the engine is running, the intake 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 sensor located behind the heating resistor maintains its temperature by heating the air. The differential signal of both sensors makes it possible to obtain a characteristic curve depending on the amount of air flow.

The ECU analyzes the MAF signal and, using its data tables, determines the duration of the injector opening pulse, which corresponds to the mass air flow signal.

DMRV 037 " BOSCH" has a built-in air temperature sensor (DTV), the readings of which are used in the multiport fuel injection system of the 2112 car and multiport fuel injection systems for EURO-2 toxicity standards. The sensitive element of DTV is a thermistor (a resistor that changes resistance depending on temperature) - installed in the flow of passing air. The controller supplies 5V through a fixed resistor inside the controller. The controller calculates the temperature from the voltage drop across the sensor. As the temperature rises, the voltage decreases. The controller calculates the duration of the injector opening pulses based on the sensor readings.

The DMRV is installed between the air filter and the throttle pipe.

Other articles of the product and its analogues in the catalogs: 21083-1130010-10.

Product Features:
Mass air flow sensor(catalogue designation BOSCH 0 280 218 037) ,designed to convert the air flow entering the engine into DC voltage. Sensor information allows you to determine the engine operating mode and calculate the cyclic filling of cylinders with air at steady-state engine operating modes, the duration of which exceeds 0.1 seconds.

VAZ 2108, VAZ 2109-21099; VAZ 2110-11, VAZ 2112, VAZ 2123, VAZ 21214.

Specifications:
- Optimum fuel consumption is ensured in all engine operating modes due to high accuracy and stability of output characteristics.

Using the thermal principle of air flow measurement.

Mass air flow measurement range - from 8 to 550 kg/h.

The mass flow measurement error of the new sensor is +/- 2.5%.

The value of the output signal when measuring the flow range from 0 to 100% - from 0.05 to 5 V.

The sensor is powered from the vehicle's on-board network with a nominal voltage of 12 V.

The supply voltage range is from 7.5 to 16 V.

Current consumption (at supply voltage from 7.5 to 16 V) - 0.5 A.

Operating temperature range - from -45° to +120° С.

Time to failure, not less than 3000 hours

How to troubleshoot dmass air flow sensor BOSCH?