How to deceive the DMRV: methods, is it worth doing?

Any complex electronic sensor is quite expensive. Therefore, when, for example, a mass air flow sensor fails, car enthusiasts strive to minimize repair costs. The fact that an engine without a flow meter will not work is beyond doubt. Numerous experimenters in disabling the sensor predictably fail, although I tell stories about the successful “improvement” of the motor. And yet, is it possible to bring a “tired” flow meter back to life if purging and cleaning with the most modern means did not help? Is the notorious fake VAZ air flow sensor on sale, or does it need to be done with your own hands?

We recommend remembering the proverb “the miser pays twice” before using your “savvy”, because often dubious and small savings lead in the future to higher costs that arise due to this very saving.

Imagine a situation where the test voltage (ideally 1 ± 0.02 V) does not correspond to the norm?

Information: The functionality of a faulty air flow sensor can only be restored by increasing the voltage at the ADC output. If the flow meter shows no signs of life (no voltage), it is impossible to deceive the ECU.

Mass air flow sensor VAZ 2110: replacement and installation instructions

We have studied the malfunctions and symptoms, what a mass air flow sensor is is now clear. If we succeed in checking, and we know that the flow meter is faulty, all that remains is to replace it. To do this, you need to prepare a replacement unit (you can buy a non-standard model) and a screwdriver. Visual inspection implies analysis, but let’s repeat it again:

You need to turn off the engine and remove the key from the ignition.
Pull out the sensor connector as shown in the photo.
Now you can remove the hose on the inlet pipe. It is attached with clamps to the air filter. After removing the clamps, the hose can be dismantled.
Now we can remove the mass flow sensor and perform the replacement.

Installing a new element is done in exactly the same way.

Experiment on washing the air flow sensor

How to make a fake for a faulty mass air flow sensor for only 70 rubles, a simple and working method

Hello, dear readers!!

Many motorists, especially those who operate VAZ cars, are faced with the problem of a faulty mass air flow sensor. And everything would be fine, it’s easy to change it, but it’s expensive. High quality, about 4500 rubles. Somehow expensive. But it often fails due to oil getting into the system due to an already worn out engine. There's no point in changing it every time.

It is very easy to check the mass air flow sensor using a multimeter. And the signs may be unstable operation of the internal combustion engine, greatly increased fuel consumption, and the car may stall while driving. Difficult starting or the car may not start at all. In order not to buy a new MAF, people figured out how to make a fake that works great, I was convinced of this from my own experience when they installed one on a friend’s VAZ 2114. His MAF readings were 1.13. Although when the reading is 1.05, the mass air flow sensor is already considered worn out. It simply didn't work for him anymore.

So, in an electronics store you need to purchase a variable trimmer resistor

at 2 kOhm or 5 kOhm or even 10 kOhm, you need to use trial and error to find out which one works best. They cost around 70 rubles. If you have a Lada, I would advise buying 2kOhm or 5kOhm. I think many people have come across such a resistor in various technologies. Now, it needs to be embedded into the mass air flow sensor system. We find the signal wire; on this car it is yellow. We install a resistor in the gap. After which, monitoring the readings with a multimeter, we can set the readings we need. Namely 1.03. From the resistor you need to select two wires to which it reacts. You will find it easily.

Source

How to check the mass air flow sensor for serviceability

There are several basic methods for checking the mass air flow sensor, which allow you to verify its malfunction.

Checking the mass air flow sensor in motion

The easiest way to diagnose a flow meter is to analyze the operation of the engine when the sensor is forcibly turned off. The check proceeds as follows:

It is necessary to open the hood and disconnect the connector from the mass air flow sensor. After this, close the hood;

Next, get behind the wheel of the car and start the engine. The car should start to operate in limp mode, in which the Check Engine light will be on.

In such a situation, the amount of air in the fuel mixture will be determined depending on the throttle position; Try driving the car and pay attention to its dynamics in comparison with how the car worked before the mass air flow sensor was turned off. With the sensor turned off, the car should become “more lively”, that is, accelerate faster

If this is the case, then we can confidently talk about problems with the mass air flow sensor.

It is highly not recommended to operate a car for a long time with the mass air flow sensor turned off.

Checking the mass air flow sensor with a multimeter

You can diagnose a problem with the sensor using a multimeter. To do this, you must first understand the design of the device and its “pinout,” that is, the wiring of the wires on the board. There are 4 wires coming out of the mass air flow sensor. Depending on the MAF model and manufacturer, their colors may vary, but in most cases they are as follows:

How to clean the DMRV on a Priora

Pink (or pink-black): wire to main relay;
Green: wire to ground;
Gray: wire to power;
Yellow: signal input.

To check the mass air flow sensor, the multimeter must be set to constant voltage measurement mode and set the limit to 2 Volts. Next, you need to turn on the ignition, but do not start the engine. Once this is done, connect the multimeter's red lead to the sensor's signal input (yellow wire) and the black lead to ground (green wire). This can be done without “exposing” the wires by inserting the probes of the diagnostic device through the rubber seal of the connector.

Based on the measurement results, conclusions can be drawn about the state of the sensor:

Fully serviceable device (new): 0.996 - 1.01 Volts;

The sensor is in good condition, but has already worked: 1.01 - 1.02 Volts; The sensor has been working for a long time, but is still working: 1.02 - 1.03 Volts; The mass air flow sensor will soon need to be replaced: 1-03 - 1.04 Volts; The flow meter is close to failure, but continues to cope with the tasks: 1.04 - 1.05 Volts; The sensor needs to be changed: 1.05 Volts and above.

Some modern on-board computers allow you to view the voltage on the mass air flow sensor. In such situations, you can do without a multimeter.

Visual inspection of the mass air flow sensor

Experienced motorists can determine a malfunction of the mass air flow sensor by its appearance. The first step is to remove the mass air flow sensor, and then inspect it carefully. Signs of a malfunction are liquid getting into the air pipe and the mass air flow sensor (or the presence of mechanical damage).

How to use a multimeter to check the performance of the MAF on a VAZ-2110: video tutorial

Most often, liquid may end up in the sensor for the following reasons:

Increased oil level in the crankcase. In such a situation, oil enters the sensor;
Clogged oil sump of the crankcase ventilation system;
Untimely replacement of the air filter, due to which dirt gets onto the MAF hot air anemometer.

The easiest and most reliable way to diagnose problems with the mass air flow sensor is to replace it with a working device. For example, you can remove a suitable working sensor from another car, install it and make sure that engine operation has stabilized. In such a situation, you can immediately go buy a new sensor without diagnosing it with a multimeter or other methods.

Functionality check

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

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

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

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

Finding an error using a diagnostic adapter

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

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

Let's consider each of the listed methods.

Testing while driving

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

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

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

Diagnostics using a multimeter or tester

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

An example of measuring the voltage on the mass air flow sensor in a VAZ 2114 car with a multimeter

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

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

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

External inspection of the sensor

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

Inspect the sensor for damage and fluid

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

Installing a similar, known-good device

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

Principle of operation

The piston stroke occurs when fuel is burned with air in a ratio of 1:14, maintaining which ensures optimal operation of the power plant. When the proportion decreases or increases, the engine does not stop working, but there is excessive fuel consumption or a decrease in engine operating power. We need a mass air flow sensor so that air flows in portions. The operation of the unit proceeds as follows: the VAZ 2110 air flow sensor calculates the portion of fresh air, and then sends the data to the main computer, which, based on this information, calculates the portion of fuel.

The harder you push the gas, the more filtered air the powerplant requires. The mass flow sensor detects the increase and commands the electronics to increase the amount of fuel. When moving at the same speed, each portion should be equal to the previous one. The mass air flow sensor receives data on the load of the power unit, and then calculates the required portion of air. When the driver presses the pedal, the throttle valve opens, thereby increasing the volume of intake air - the load increases. When the pedal is released, the load drops.

Damaged sensor due to dust

Information about the operation and design of the mass air flow sensor

Again, we will not consider the historically outdated mechanical options with a weather vane and the General Motors frequency flow meter, which was used in conjunction with the January 4-series ECU. Modern flow meters for the VAZ 10 series operate on the principle of a hot-wire anemometer.

It is based on the properties of some metals to significantly change resistance depending on heat (the MAF sensor uses an alloy of iridium with platinum, which causes the high cost of the device). There are two resistors in the air flow: one is precision, the second can change the resistance using heat. Voltage is applied to it, the thread is heated until it matches the standard. Depending on the strength of the air flow, the thread cools and the resistance changes. By increasing the voltage across the resistor, the temperature and, accordingly, the resistance are restored. This happens in real time, that is, the control of the air mass is constant. At the output, the mass air flow sensor displays the signal voltage with an accuracy of hundredths of a volt. The received information is processed by the ECU to accurately dose gasoline into the fuel-air mixture.

All elements are arranged into a single electronic model, which is placed in the measuring channel (air duct).

Sensor device

View of the flow meter from the grid side.

DMRV sensor VAZ 2115: signs of malfunction, how to check, clean or replace?

The sensor is disassembled.

The platinum thread is visible in this photo.

Visual inspection

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

Demonstration of a faulty mass air flow sensor on Kalina, Priora, Grant, VAZ 2110-2112, 2114-2115

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

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

Three types of VU meters are most widespread:

Wire or thread.
Film.
Volumetric.

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

By changing the position of the slider, driven by a special blade, which is affected by the air flow passing through the device. Considering the presence of rubbing mechanisms, the level of reliability of such structures is quite low. This was the main reason for the refusal of car manufacturers from sensors of this type. For reference, here is a simplified example of the design of a volumetric flow meter.

Volumetric air flow sensor device
By counting Karman vortices. They are formed if a laminar air flow washes over an obstacle whose edges are quite sharp. The frequency of the vortices breaking off from them is directly related to the speed of air flow passing through the device.

Vortex sensor design (widely used by Mitsubishi Motors)

Designations:

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

Wire sensors

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

Design of volumetric meter IVKSH 407282.000

Designations:

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

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

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

where I is the current passing through RT and heating it to temperature T1. In this case, T2 is the ambient temperature, and K1 and K2 are constant coefficients.

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

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

Typical functional diagram of a wire mass air flow sensor

Designations:

Q - measured air flow.
U – signal amplifier.
RT - thermal resistance wire, usually made of platinum or tungsten filament, the thickness of which is in the range of 5.0-20.0 microns.
RR – temperature compensator.
R1-R3 are ordinary resistances.

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

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

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

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

Film air meters

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

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

ADC codes

ADC code parameters relate to analog sensors of the control system:

Throttle position sensor
temperature sensor
Mass air flow sensor
Sensor L-probe
Potentiometer CO.

Physically, ADC codes reflect the voltage that the sensor produces. Typically, these parameters are used to test sensor circuits. If fault codes occur associated with a low or high signal level of such a sensor, then the control system operates in backup modes. In this case, the value of the parameter related to this sensor is selected either from the emergency table or calculated using specified formulas, for example, the coolant temperature with a faulty temperature sensor increases during engine operation.

If, during a physical change in the parameter measured by the sensor, the ADC code remains a constant value, then the electrical circuit connecting the sensor is inoperative.

ADC values are dimensionless, but for the user in scanner testers they are translated into the voltage that a particular sensor produces.

Therefore, using an ADC code, for example, from an L-probe sensor, you can more clearly evaluate the work in the feedback loop system to maintain the stoichiometric composition of the mixture. If the L-probe sensor is inoperative, then the ADC code is in the range of 0.4-0.7V.

The ADC code value (output voltage) from the throttle position sensor can indicate the lower limit at which the system detects sensor error. A throttle position equal to zero corresponds to a voltage from the sensor of 0.52 V.

When the ignition is on, the output voltage from the mass flow sensor (ADC code) should be 1.00V.

The temperature sensor, throttle position sensor, mass flow sensor are powered by a voltage of 5.00V, which is supplied by the control unit. If the control unit produces an unstable voltage, then the sensor readings will change and the behavior of the system in this case is unpredictable.

Purpose and explanation of the abbreviation

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

Installation location of mass air flow sensor on Gazelle 405

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

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

How does the VAZ 2114 mass air flow sensor work?

A modern mass air flow sensor (also known as MAF in English) uses sensitive sensors and a special calculation algorithm to compare the resistance readings of two thermistors. One of them is a reference value, its value is constant. The second (made of platinum-iridium wire) is forcibly heated. The incoming air flow cools the wire, the resistance changes, and to equalize it with the reference, a larger heating current is required. It is the difference in current strength (in this design, voltage is measured using the Ohm's Law formula) that provides information to the ECU.

The measurement accuracy is 1/100 volt, so the slightest malfunction of the mass air flow sensor instantly affects the quality of engine operation.

Symptoms and troubleshooting

Since the mass air flow sensor is electronic equipment, and a very complicated one at that, most car owners do not dare diagnose it themselves and take it to a car service center the old fashioned way. But quite often, having just connected the diagnostic device to the sensor, the auto repairman declares that the device is completely faulty, it cannot be repaired, and its place is only in a landfill. Rest assured, if you bring in a completely new sensor, the technician will tell you the same thing.

But any disinterested expert will say that the mass air flow sensor is an almost indestructible device. It may malfunction, sometimes seriously, but this is a completely fixable problem, something that will take no more than an hour. But how to check the mass air flow sensor for performance? Very simple. If, after installing a new sensor on your car, you notice that it works perfectly, then that is where the problem lies. If the situation has not improved at all, then there is no point in wasting your energy, time and money on the empty hassle of replacing a completely “healthy” sensor.

Just above we mentioned such a device as a multimeter. You can understand whether the sensor is working or not by finding out the voltage of the device. If everything is normal, then the multimeter produces 1-1.2 W. If there are any problems, then the scale goes down, the critical mark starts at 0.99 W. If, on the contrary, the voltage is higher than normal, for example 1.037, then this indicates one thing: the sensor is very clogged, and therefore makes errors in the readings. If you clean it, it will work again at the same rate.

First of all, this is a sharp increase in fuel consumption. Here you should not blame the car for its large “appetites”: it is not to blame, and the manufacturer is not to blame, here you just need to “treat” your “iron horse”. Of course, this can happen not only in the case of a sensor failure, but from this fact alone you can come to the right idea: most likely the problem lies in the tiny device.

Also, when the engine loses power, a hot engine will stop starting. The car, previously dynamic and controllable, turns into some kind of monster on wheels, which is constantly lost in control and “freezes”. And finally, if you see a simple Check Engine sign on the instrument panel, then there can be no doubt: this sensor is asking you for an ambulance.

Signs of a malfunction of the mass air flow sensor on a VAZ 2110: how to rinse and clean it yourself

When the first signs of a malfunction occur, you should definitely check the mass air flow sensor, and then, depending on the situation, clean or replace the device.

Now let's talk about how to check our sensor. Today, two main methods of checking the mass air flow sensor are used.

The engine is tested in operation with the mass air flow sensor disconnected. Simply turn off the power from the regulator and start the motor. When the mass air flow sensor is not present during startup, the electronic control unit turns on the power unit in emergency mode. The speed is adjusted to 1500 rpm. After disconnecting the sensor, drive a few kilometers and evaluate the dynamics and power. If the engine is running normally, then the sensor is the cause of the symptoms.

The second method will require the use of a car tester or voltmeter. After starting the ignition, do not start the engine. The voltage threshold is set on the tester to 2V. The positive probe connects to the yellow wire on the sensor connector, and the black probe connects to the green wire. Next, refer to the table.

Index

Air flow sensor condition

The sensor is functioning normally

Not ideal, but still acceptable voltage readings

Maximum permissible values that indicate imminent sensor failure

The air flow sensor has failed and needs to be replaced

Quite often you can avoid replacing the mass air flow sensor by simply cleaning this engine element.

You should do the cleaning yourself in this way:

Remove the pipe from the mass air flow sensor;
Now remove the sensor from the pipe. Otherwise, high-quality washing will not work;
To remove the sensor, arm yourself with sprocket keys in advance. Finding such kits is not a problem;
Unscrew all the fasteners, remove the sensor from the pipe and assess its external condition;
Often there are traces of oil deposits on the sensor. The purpose of cleaning is to make the device as good as new;
Carburetor cleaner is often used to clean the air flow sensor;
Inside the film there are sensors, which are small wires attached to a special resin. These elements must be carefully sprayed with cleaner so as not to damage the devices;
Wait a while for the surfaces to dry. To speed up the process, use a can of compressed air;
It is not uncommon to use alcohol instead of carburetor cleaner, which also works quite effectively;
Proper cleaning of the mass air flow sensor involves treating the pipes from accumulated debris, dirt and dust;
Having carefully processed all the components of the removed mass air flow sensor, wait until it dries, and then reassemble it. Cleaning is complete.

Spray cleaning

Statistics show that in about 80% of cases, simple cleaning can return the mass air flow sensor to its previous functionality.

Price issue

80% is not 100. Therefore, sometimes you have to change the sensor. And to replace it, you need to buy it.

There are three price categories for air mass flow sensors:

Cheap. These are predominantly Chinese products, the price of which is up to 1000 rubles. It is strongly not recommended to purchase such regulators;
Average. These include sensors from AvtoVAZ, domestic and some foreign analogues. These cost from 1500 to 2500 rubles;
Expensive. High-quality, reliable, imported air flow sensors, the price of which can reach 5.5 thousand rubles. It’s hard to say how rational it is to buy them. But they will definitely last a long time.

It is not difficult to replace the mass air flow sensor with your own hands, even if you do not have any special skills in car repair. Having checked the condition of the device and determined that cleaning will not help, all that remains is to replace it.

Place the car on a level surface, lift the hood and remove the negative terminal from the battery.
Disconnect the sensor connector. We have already talked about its location, so there will be no problems with the search.
Using a screwdriver, remove the clamping bolt of the clamp that secures the corrugation to the mass air flow sensor.
The corrugation is removed.
Using a 10mm wrench, unscrew the two bolts that hold the sensor to the air filter housing.
After removing the failed oxygen sensor, install a new regulator in its place.
Screw back a couple of bolts, secure the corrugation and secure it with a clamp.
Reconnect the connector and return the negative terminal to the battery.

If everything is done correctly and the breakdown is correctly identified, then the engine will return to its previous performance and the error signal on the dashboard will disappear.

Replacing the device

To finally check the result of the repair, go out onto the road, do a test drive and be sure to try to press the gas pedal sharply. If the dynamics and power become the same as before the problems arose, you did everything correctly, and it was the mass air flow sensor that was the culprit of the malfunction.

Troubleshooting methods

There are several options for troubleshooting the device:

Replacing the sensor. The surest way to ensure normal system operation is to install a known working controller.
Check the connection of the regulator, as well as the functionality of the electrical circuit. It is very rare, but it happens that the regulator refuses to work normally due to oxidation of the contacts on the connector. In this case, you can try to disconnect the sensor and clean the contacts with an iron brush.
Rinse the device. This option for restoring performance is considered one of the most popular among our compatriots today. Cleaning usually takes a little time, but you have every chance of restoring the functionality of the regulator. Our resource has already written about flushing the device; detailed step-by-step instructions are presented in this article.

How to deceive the mass air flow sensor using ECU firmware

The good thing about the previous method is that its implementation does not require complex equipment or painstaking work. If you were able to check the voltage at the output of the flow meter with a multimeter (which means you at least have one), and know how to hold a soldering iron in your hands, installing a resistor in the wire gap will not be difficult. However, the dependence of voltage on air flow mass is nonlinear. And when the throttle valve opens, the error of the signal corrected by the resistor at rest will increase. Accordingly, the fuel-air mixture will not be ideal.

This means that you need to adjust the MAF calibration in the ECU firmware.

We install the specialized tuning program “DFID Corrector” on the laptop.
We connect the car scanner to the OBD-II connector and establish communication between the ECU and the computer.

After calibration, the data on mass air flow will be correct throughout the entire engine speed range.

Troubleshooting methods

There are several options for troubleshooting the device:

Replacing the sensor. The surest way to ensure normal system operation is to install a known working controller.
Check the connection of the regulator, as well as the functionality of the electrical circuit. It is very rare, but it happens that the regulator refuses to work normally due to oxidation of the contacts on the connector. In this case, you can try to disconnect the sensor and clean the contacts with an iron brush.
Rinse the device. This option for restoring performance is considered one of the most popular among our compatriots today. Cleaning usually takes a little time, but you have every chance of restoring the functionality of the regulator. Our resource has already written about flushing the device; detailed step-by-step instructions are presented in this article.

A way to emulate the operation of a sensor without lambda trickery

If you don’t want to bother with installing plugs and electronic additional devices, there is a surefire way to directly fool the engine control unit. It is necessary to “reflash” the ECU program.

The program reduces the environmental level of emissions to EURO-2. In this case, the power unit does not need a catalyst at all. He is sure that it should not have been in the system from the factory. The mention of it is completely erased from the “brains” of the internal combustion engine.

Flaws

Incorrectly changing the program code or factory settings can have a detrimental effect on the operation of the motor. In certain modes, it will stop producing the required power, fuel consumption will increase, etc. No one can guarantee that the engine will not stop at any time. Because the crooked hands of programmers can change the wrong settings and get into the wrong places. The program can “fly off” at any time, and getting in the way is a bad prospect.

What are the disadvantages of installing a decoy?

Of course, in the end everything is not so simple. And many drivers may ask a reasonable question: why do you need a sensor at all if it can be easily replaced with a resistor? But you shouldn’t think that manufacturers are simply increasing the cost of the car by installing an expensive device. The fact is that the sensitive element of the sensor works according to the following principle: the metal surface is cooled under the influence and, as a result, its resistance changes. This allows you to calculate the incoming air mass.

If you establish a decoy, then you can’t even dream of any correct readings. As a result, fuel consumption will increase slightly. However, many drivers are ready to do this, just to avoid spending money on an expensive sensor. I have a different opinion on this matter. I believe that if the mass air flow sensor breaks down, it is necessary to install a new sensor.

A trick can only help if the breakdown occurred on a long journey or if there is currently a lack of money for a full repair. And in any case, it is better to entrust the work of installing the blende to a specialist. If you are insufficiently qualified, there is a risk of causing serious damage to the car through your manipulations.

Do you have anything to add? Write in the comments, perhaps this will greatly help readers in the future. Also subscribe to our channel in ZEN .

Source

Cleaning the mass air flow sensor (MAF) on VAZ 2110, VAZ 2111, VAZ 2112

Welcome! Mass air flow sensor - in abbreviated form it is simply called mass air flow sensor, this is a very important and necessary sensor in the system, because thanks to it the controller (It is also called the brain) understands how much air is supplied to the cylinder at one time or another and, in connection with this, adjusts fuel supply to the car, thereby the car runs smoothly and without interruptions, but any of the sensors gets dirty or gradually fails, the same thing happens with the air flow sensor, it has platinum threads or, as they are also called, platinum spirals, when they contamination, the sensor begins to incorrectly read the air that goes into the cylinders and, in connection with this, the car begins to become dull in the literal sense of the word, it accelerates poorly, its speed fluctuates and it consumes gasoline more than usual, in this case there are two options, or change the sensor to a new one, or try to clean the old one, it’s up to you to decide which way you go, but cleaning the sensor does in some cases give very positive results, but not always.

Note! In order to clean the sensor from dirt, you will need special chemicals: These include liquid for cleaning the carburetor, but only when choosing this liquid, be careful because if you buy too strong a liquid (Meaning that corrodes the dirt very much), you can damage the sensor itself like this as it is not intended for this, for more details on how to choose a liquid, see the video clip at the very end of the article! (By the way, to clean the sensor, also stock up on a set of various wrenches, and if possible, stock up on a wrench with socket heads and pliers)

Where is the mass air flow sensor located? It is located immediately after the air filter housing ends and it is installed immediately behind it, so that you can understand its location in more detail, open the hood of the car and first find the housing itself inside which the air filter is located (For clarity, the housing is indicated by a blue arrow) and then If you find it, you can immediately look at the sensor itself, which is indicated by a red arrow in the photo; you will need to remove it for cleaning.

Determining the malfunction of the mass air flow sensor

There are various breakdowns in the Priora mass air flow sensor. To understand that the mass air flow sensor is faulty, you need to check it using the Check Engine lamp, or a multitester designed for testing. If you are shown error codes 34 or 33, then the mass air flow sensor has a malfunction. This means you need to check the motor. Another evidence of a malfunction of your mass air flow sensor in Priora is an increase in fuel consumption. If your engine does not start well, this may also indicate a problem with the mass air flow sensor.

If you notice poor acceleration dynamics, the car begins to brake sharply and accelerate sharply, then this also serves as a signal that your sensor is broken. Interruptions in engine operation and jumps in speed also indicate this. If the car stops the engine when changing gears, then you should check the sensor.

The engine crankcase ventilation system has its own characteristics. It has two circuits installed. The first one is large, it starts working when the throttle valve is open. The second is small, works in idle mode, when the throttle is closed. During operation with the throttle closed, crankcase gases enter the throttle space.

And some of them touch the film resistor of the mass flow sensor. The deposited resins begin to change the characteristics of this resistor, so the sensor begins to fake. In this regard, the idle speed controller also begins to malfunction, this affects the engine starting. The mass air flow sensor becomes faulty. A common problem with the sensor is contamination of the coil. They can be cleaned using carburetor cleaner, but this must be done carefully.

Briefly about the renovation

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

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

This project appeared due to the reluctance to buy a part that had been in use for about 30 (thirty) years for a quite considerable amount of 3,000 - 5,000 rubles. We can say that this will be a test of the pen in circuit design and programming of microcontrollers. If you're interested, see the continuation below the cut.

Mass air flow sensor device (English abbreviation - MAF)

The housing is made in the form of a cylinder, the diameter of which coincides with the air duct of the intake manifold. Installed at the outlet of the air filter (using the example of a VAZ 2112). The housing itself is a calibrated measuring channel.
To protect against foreign objects, a deflector and a metal screen in the form of a mesh are installed at the entrance. The correct air flow is formed through them.
The air flows through the flow sensor itself, which operates on the thermal anemometric principle. There are two resistors installed inside (reference and variable), connected to a common circuit using a ballast circuit. Variable, precision, changes resistance when cooling and heating. The thread of this resistor is made of an alloy of iridium and platinum. The control board monitors that the resistance is the same. To do this, a platinum thread cooled by an air flow is heated by electric current. The resistor is constantly supplied with voltage, the value of which varies with an accuracy of 1/1000 volt.
The value of this voltage is output by the MAF circuit to pin No. 5 of the connector. The signal is read by the ECU controller and programmatically converts this value into air mass (kg/hour).

In order for the fuel-air mixture to work efficiently, gasoline and air are mixed in a ratio of 1 to 15

Therefore, it is important that the mass air flow sensor produces accurate data

Measuring voltage in the sensor

When repairing the mass air flow sensor in a VAZ 2110 with your own hands, you need to check the device using a special diagnostic device. If this is not possible, use a regular voltmeter. The scale should allow you to measure voltage with an accuracy of 0.01 volts. Measurements are taken between the sensor input and ground. The input is indicated by a yellow wire, and ground is usually indicated by a green wire. The optimal value is a voltage in the range from 0.99 to 1.01 V. If the mark shows a value higher, it’s time to repair the mass air flow sensor. To clean the sensor, you must first remove the unit mount. The factory fasteners look rather tricky; it makes sense to replace them with standard ones and a regular screwdriver.

The solvent will be carburetor cleaner. This is also convenient because the tube of the aerosol can fits perfectly into the resistor channel. We clean the resistor in several passes. Important: do not use matches, toothpicks, sharp sticks, or elegant rollers. Even a jet of compressed air can cause harm. After assembly, check the voltage again. If it is in the desired range, then the repair was successful.

Prevention and testing of mass air flow sensor on VAZ 2110

As a preventive measure, we can recommend timely replacement of the air filter. The use of sports zeros shortens the life of the flow meter. In any case, regular cleaning of the air flow sensor will not hurt.

We disconnect the sensor connector, having first removed the ground from the battery.
Carefully unscrew the flow meter housing from the intake manifold flange.
If dust deposits are detected, blow out the cavities with compressed air.
Of course, you also need to clean the air duct and air filter box at the same time.

If the contamination is severe (with oil and moisture), you can use a special cleaner for flow meters or carburetors; the manufacturer does not matter. To do this, it is necessary to direct the jet not only to visible sensors, but also to hidden cavities where the platinum resistor (thread) is located.

After this, the flow meter is installed in its regular place and the functionality of the electronic part is checked.

Replacing the air flow sensor

The replacement procedure is as follows:

First you need to loosen the clamp that secures the air duct, for this you use a Phillips-head screwdriver. The pipe itself can be dismantled.
Disconnect the power connector from the regulator; to do this, simply press the latch at the bottom and pull the plug itself to the side.
Next, using 10mm wrenches, you need to unscrew the two bolts. It may be difficult at this stage, so you can use a ratchet to unscrew the bolts quickly.
The regulator can then be moved to the side and removed.
The installation procedure is carried out in reverse order.

Photo gallery “Help in replacing the air flow sensor”

1. Disconnect the air duct and disconnect the regulator power connector.

2. Remove the sensor from its seat and replace it with a new one.

How to check the mass air flow sensor on a VAZ 2110 with a multimeter

A. Check the wiring harness and contacts. At this stage, the interaction between the ECU and the mass air flow sensor is tested. Performed with the connector removed and the ignition key in the “ON” position. You need to know the pinout of the sensor connector on the ECU side:

Contact No. 1 is not involved in the test.
Contact No. 2 - 12 volt power supply. A deviation of even 0.5 volts is not acceptable.
Contact No. 3 - “ground”, mass.
Contact No. 4 - 5 volt sensor power supply. Likewise: deviations are not allowed.

B. Having verified the integrity of the cable harness and the operability of the ECU, we check the signal voltage on the connected flow meter. Turn the ignition key to the “ON” position and do not start the engine! We connect a digital multimeter to ground and contact No. 5 of the air flow sensor.

The multimeter is set to 2 volt measurement mode with an error of 1/100 volt. These readings accurately indicate the condition of the flow meter, so the accuracy class of the tester must be high.

If the device shows a voltage within 0.99-1.02 V, your flow meter is new or in excellent condition.

Readings from 1.03 to 1.05 volts are acceptable, but the air flow sensor will soon fail. You can still drive with such a sensor, but the quality of the fuel-air mixture will be far from ideal.

If there is no voltage or its level is above 1.05 V, the flow meter is faulty and requires replacement.

Where to buy car accessories

Spare parts and other products for the car are easily available for purchase at auto stores in your city. But there is another method that has recently received significant improvements. You no longer need to wait a long time for a parcel from China: the AliExpress online store now offers the opportunity to ship from transshipment warehouses located in various countries. For example, when ordering, you can specify the “Delivery from the Russian Federation” option.

Follow the links and choose:

ELM327 V1.5 BT OBD2 car scanner	Car radio 7805C with 4.1 inch touch screen, MP5 player with Bluetooth, TF, USB support	Air flow sensor MAF for BA3
Eunavi 12V universal car door lock	Parking assistance system GSPSCN, 5-inch rear view monitor	Car Rear View Mirror 4.3 inch CCD

Interchangeability

This issue is quite relevant, especially taking into account the cost of original products from the imported automobile industry. But it’s not so simple here, let’s give an example

In the first production models of the Gorky Automobile Plant, the injection Volgas were equipped with a BOSCH air flow sensor. Somewhat later, imported sensors and controllers replaced domestic products.

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

Structurally, these products were practically no different with the exception of several design features, namely:

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

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

Film air flow sensor Siemens for GAZ 31105

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

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

Lada Granta 2012, 98 l. With. — electronics

Lada Granta, 2012

Comments 67

Is it possible to connect this DMRV through an additional resistance?

Can you tell me where I bought this MAF sensor (118th). I'm covered. I can’t find it either in the city or on the Internet. If I don’t find it, I don’t know what to do. At least transfer to a trampler.

Are you sure you have 118? They look the same, but may differ in markings.

What else happens?

It's in my garage

I flushed with ABRO CARB. Before this the engine stalled.

It’s strange, you have a Granta automatic transmission of 16 class, and the DMRV is marked for 8 class. It should be?

If I'm not mistaken they are no different for 8 or 16 valve engines

Thank you, the salesman in the auto store said the same thing) the only thing was that I wanted to install the Boshevsky one, but the connector turned out to be different.

For what reason do you want to change the mass air flow sensor?

Have already changed! The car was stalling and stalling in the heat with the air conditioner on. I measured it with a multimeter and it was 1.7)

1.7 is this the readings of the mass air flow sensor multimeter?

Maybe it is so)) The new MAF showed 1.01 in the multimeter. I read the information on the measurements here: www.drive2.ru/l/2893171/

I will say this, after the procedure for replacing the DMRV, the car came to life, the idle speed became smooth!

It’s strange, you have a Granta automatic transmission of 16 class, and the DMRV is marked for 8 class. It should be?

on Grant and Kalina 2 one mass air flow sensor is installed. Itelma. Regardless of the number of engine valves. On Kalina 1 it was installed on 8 valve electric gas. Priorovsky Bosch was installed on the 16 valve.

When is it time to clean?

But regardless of the type of sensor, over time it begins to function incorrectly due to contamination - the platinum measuring elements become covered with dust. Therefore, the question of how to clean the mass air flow sensor will always be relevant.

Why does this happen? The main reason for sensor contamination lies on the surface - the unsatisfactory condition of the air filter. If the filter element is of poor build quality, then it is not able to trap microscopic particles of dirt and dust that settle on the sensing element of the mass flow sensor.

As a result, the device is not able to accurately measure the amount of air and sends incorrect data to the ECU. It's not hard to imagine what this might lead to. Here we gradually approach some characteristic signs that may indicate that the sensor is clogged and needs to be cleaned:

The need to clean the mass air flow sensor on a VAZ or other cars arises when the engine idles intermittently, in some cases they are too high - up to 1500.
The car may jerk and have difficulty accelerating.
Sometimes the engine does not start at all.
Increased fuel consumption - sometimes up to 15 liters per 10 km.
Check Engine light on the dashboard.

However, the above signs do not always accurately indicate contamination of the air flow sensor. A variety of situations can arise, and among them is one when the sensor itself is fine, but the fault lies in the hose that connects the device to the module.

In other words, although there are many obvious signs that a particular part of the car is faulty, they can indicate any other problem.

Features, diagnostics and replacement of elements of injection systems on VAZ cars

Below we will look at the main controllers!

Hall

There are several options for how you can check the Hall sensor of a VAZ:

Use a known working device for diagnostics and install it instead of the standard one. If after replacement the problems in engine operation cease, this indicates a malfunction of the regulator.
Using a tester, diagnose the controller voltage at its terminals. During normal operation of the device, the voltage should be from 0.4 to 11 volts.

The replacement procedure is performed as follows (the process is described using the example of model 2107):

First, the switchgear is dismantled and its cover is unscrewed.
Then the slider is dismantled; to do this, you need to pull it up a little.
Remove the cover and unscrew the bolt that secures the plug.
You will also need to unscrew the bolts that secure the controller plate. After this, the screws that secure the vacuum corrector are unscrewed.
Next, the retaining ring is dismantled and the rod is removed along with the corrector itself.
To disconnect the wires, you will need to move the clamps apart.
The support plate is pulled out, after which several bolts are unscrewed and the manufacturer dismantles the controller. A new controller is being installed, assembly is carried out in the reverse order (the author of the video is Andrey Gryaznov).

Speeds

The following symptoms may indicate a failure of this regulator:

at idle, the speed of the power unit floats, if the driver does not press on the gas, this can lead to an arbitrary shutdown of the engine;
the speedometer needle readings float, the device may not work as a whole;
fuel consumption has increased;
the power of the power unit has decreased.

The controller itself is located on the gearbox. To replace it, you only need to jack up the wheel, disconnect the power wires and remove the regulator.

Fuel level

The VAZ or FLS fuel level sensor is used to indicate the remaining volume of gasoline in the fuel tank. Moreover, the fuel level sensor itself is installed in the same housing with the fuel pump. If it malfunctions, the readings on the dashboard may be inaccurate.

The replacement is done like this (using the example of model 2110):

The battery is disconnected and the rear seat of the car is removed. Using a Phillips screwdriver, unscrew the bolts that secure the fuel pump hatch and remove the cover.
After this, all wires leading to it are disconnected from the connector. It is also necessary to disconnect all the pipes that are supplied to the fuel pump.
Then the nuts securing the clamping ring are unscrewed. If the nuts are rusty, treat them with WD-40 before unscrewing.
Having done this, unscrew the bolts that directly secure the fuel level sensor itself. The guides are pulled out from the pump casing, and the fasteners need to be bent with a screwdriver.
At the final stage, the cover is dismantled, after which you will be able to gain access to the FLS. The controller is replaced, the pump and other elements are assembled in the reverse order of removal.

Photo gallery “Changing the FLS with your own hands”

Idle move

If the idle speed sensor on a VAZ fails, this is fraught with the following problems:

floating speed, in particular, when additional voltage consumers are turned on - optics, heater, audio system, etc.;
the engine will start to stall;
when the central gear is activated, the engine may stall;
in some cases, failure of the IAC can lead to body vibrations;
the appearance of a Check indicator on the dashboard, but it does not light up in all cases.

What are they needed for

The fact is that in order to achieve certain environmental standards in cars, catalysts are installed that “afterburn” the exhaust gases. To control this process, the engine control unit needs two values - the oxygen content before and after the catalyst.

It compares these indicators and regulates the fuel supply in the air-fuel mixture. If you simply remove the catalytic converter and install a flame arrester in its place, the two sensors will read the same. Since nothing is burned anywhere, the exhaust gases wash the first and second lambda probes unchanged.

This will “drive” the engine ECU crazy. The “Check Engine” icon will appear on the dashboard, the engine will run unevenly, the dynamic properties of the car will decrease, and fuel consumption may increase. All this will negatively affect the operation of the power unit.

To avoid this, they came up with the idea of installing lambda decoys - physical plugs or electronic systems to simulate the correct operation of the oxygen sensor.

They create for the control unit the effect of the correct operation of the catalyst, although it is not in the exhaust system.

How to understand that the mass air flow sensor has failed

You can guess that the device has started to work incorrectly based on several main signs:

Fuel consumption has increased sharply.
The car's dynamics have become worse.
The engine began to run unstably. In some cases, it may turn off without assistance.
Gear changes are jerky.
Sometimes there are difficulties starting the engine.

In addition, owners of modern cars can simply perform diagnostics to determine if the sensor is broken. To do this, you need to read the device data with the ignition on. If they do not meet factory standards, then the device is faulty. Very often, one of the symptoms of a breakdown is the appearance of the Check Engine sign on the dashboard.

If it turns out that the sensor has failed, then you need to decide what to do with it. A new mass air flow sensor will cost a five-figure sum. Therefore, not all drivers agree to install a working device. It's easier to install the decoy. Some car owners are trying to bring life back to their old device. Of course, you can flush the sensor channels from oil, but this action is not always effective. You can use a special cleanser, but you will have to pay a lot of money for it. And the decoy costs only about 100 rubles. In some cases, you can get it practically for free.