How to check the DMRV of a Priora 16 valves without a multimeter

Mass air flow sensor, what kind of “beast”?

The Priora air flow sensor, as its name suggests, generates the amount of air required to compose the air-fuel mixture. The air passing through the sensor is counted by a sensitive element located inside the sensor. The air flow sensor sends all measurements taken to the electronic engine control unit, which in turn adjusts the fuel and air parameters to supply the cylinders with a fuel mixture that has already been prepared for normal operation of the internal combustion engine.

Design

The mass air flow sensor consists of the following elements:

• Frame;
• Electronic element;
• Filter;
• Sensitive part;

conclusions

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

Other symptoms of a faulty mass air flow sensor :

1. Check Engine error appears;
2. Increased fuel consumption;
3. Doesn't start well when hot;
4. The car began to accelerate slowly;
5. Engine power lost.
6. Etc.

How to check the mass air flow sensor

Symptoms of a problem

Since the sensor is electronic and if it fails, the “CheckEngine” lamp will necessarily light up on the car’s dashboard. But not in all cases the sensor fails completely. When the sensor is dirty or old, it begins to incorrectly read the air volume, which significantly affects the formation of the air-fuel mixture.

In case of such a breakdown, the “CheckEngine” warning light will not light up.

Signs:

• Engine speed fluctuates;
• Difficulty starting in all temperature conditions of the internal combustion engine;
• Increased fuel consumption;
• Uneven engine operation at idle;
• Loss of vehicle dynamics;

If you find such malfunctions on your car, first of all you need to inspect the air flow sensor.

Diagnostics

During diagnostics, first of all, the clamp holding the air supply pipe to the mass flow sensor is loosened. You will need a Phillips screwdriver here. The corrugation itself must also be inspected. Its inner surface must be clean and dry. The presence of traces of dampness or condensation indicates a failure of the air filter. Its malfunction usually leads to rapid failure of the mass air flow sensor.

Next, use a 10mm wrench to unscrew the sensor clamps, after removing which it is necessary to carry out an external inspection. It is important to pay attention to the seal - it is normally located at the very edge of the flange. Displacement of it leads to contamination of the internal elements of the sensor.

Checking the performance of the mass air flow sensor is carried out using a multimeter. The procedure is as follows:

• disconnect the terminal supplying the sensor;
• the tester probes are connected to the wires (red to yellow and black to green);
• in this situation, the mass air flow sensor begins to function in emergency mode, that is, the air supply occurs according to the latest data received from it.
• when the supply circuit does not close when the motor is turned on, then we can say with confidence: it is the sensor that is faulty.

• up to 1.02 – mass air flow sensor is working;
• up to 1.03 – slight wear;
• up to 1.04 – operability preserved;
• up to 1.05 is the maximum permissible norm.

Anything that exceeds the level of 1.05 volts indicates a breakdown of the sensor.

In addition, it is easy to verify that the mass air flow sensor is malfunctioning in this way:

• the control device is turned off;
• By car travel 2-3 kilometers.

If a noticeable improvement in engine performance is recorded, it means the sensor has failed.

Examination

Checking the mass air flow sensor is carried out using a multimeter, diagnostic tool or oscilloscope. In most cases, car enthusiasts do not have equipment that can diagnose sensor failure.

In this case, let's consider checking with a regular multimeter, which almost every driver has or is otherwise inexpensive.

Checking the mass air flow sensor with a multimeter can only be done with a sensor that is installed on an engine without an E-GAS system. The frequency sensor installed in conjunction with the electronic throttle cannot be checked using a multimeter. Checking such a sensor is carried out with a diagnostic device using ADC channels or using a diagram on an oscilloscope.

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How to check the MAF on a VAZ 2110 with a multimeter

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Replacement

• We take out the sensor and install a new one in the reverse order.

• Don’t forget to remove the rubber ring from the old sensor and install it on the new one.

MAF Lada Priora

LADA Priora cars were produced for more than 10 years, and were equipped with a range of engines of 6 modifications (4 of them with 16 valves). This does not mean that air flow sensors (MAF) are of the same variety. Together with the January 7 series and BOSCH M7 9.7 ECU controllers, the Priora engines were equipped with a mass flow sensor 0 280 218 116. Flow meters of this series are produced both by the German concern BOSCH and by numerous domestic and Chinese manufacturers. Differences in cost and reliability, and Russian products were most often equipped with electronic parts from the same BOSCH.

Mass air flow sensors installed on Priora with 16 valve engines have proven themselves to be reliable devices that do not fail without external reasons. In addition, in the event of a breakdown, flow sensors provide incorrect information for a long time with an error of 15–20%, which can be calculated from the following symptoms:

• an unheated engine may stall immediately after starting;
• gasoline consumption gradually increases;
• when moving uniformly in a straight line, the engine runs unevenly;
• the slightest overload leads to loss of traction;
• at idle, the rpm briefly hangs in the 1500 zone;
• when using approved gasoline AI 92, power is sharply lost;
• It is difficult to start the engine at low temperatures.

Instructions for washing the mass air flow sensor

Cleaning the flow meter can be done in a garage; there is nothing complicated about it.

Depending on the car model, the procedure for removing the sensor can be carried out in different ways; consider an example of cleaning with a domestic “Ten”:

1. First, you should turn off the ignition and, just in case, reset the battery terminal. Open the hood and find the mass air flow sensor, then disconnect the connector from it. There is a pipe connected to the flow meter; it must be disconnected. Using a wrench, you need to unscrew the screw that secures the device to the air filter, or rather, to its housing.
2. The flow meter itself is removed from the corrugation; in the case of the “ten”, an asterisk wrench is required to dismantle the sensor. Use it to unscrew the screws and then remove the device from the seat.
3. If, after removal, you notice that there is an oil deposit on the device, you will need to rid the case of this. Any product from those described above is suitable for cleansing. As practice shows, there is no fundamental difference between these means.
4. On the sensitive element, usually made in the form of a film, there are several controllers; they are made in the form of a wire and mounted on resin. Using the same cleaning agent, you will need to carefully, not in abundance, spray it on the sensitive element. At this stage, you should act as carefully as possible, since there is a possibility of damage to the film. After the sensitive part has been treated, you need to wait a little until the product takes effect. If there is a lot of contamination, then it may make sense to repeat this procedure once or twice. In order to ensure faster evaporation of the substance, you can use a pump or compressor device. But keep in mind that too much pressure can destroy the sensitive component, so don't overdo it.

Photo gallery “How to clean yourself”

Price issue

The cost of Liqui Moly cleanser is currently about 700 rubles. A cheaper analogue, liquid for cleaning carburetors, will cost the buyer about 70-100 rubles. As for WD-40, the cost of a 100 ml can today will be approximately 180-220 rubles.

Why does a faulty mass air flow sensor affect the operation of the internal combustion engine?

To form the correct proportions of the fuel-air mixture (the stoichiometric ratio per 1 kg of gasoline is 14.7 kg of air), the ECU controller needs to know the mass of air entering the combustion chambers. It is this data in the form of a variable voltage value that comes from the mass air flow sensor. The calibration graph of a working flow meter on a Priora shows that with the throttle valve closed (air flow 0 kg/hour), the MAF ADC voltage is approximately 1 V.

The graph also shows the accuracy with which (up to 1/1000 volt) the signal readings change with increasing air flow. This indicates the high sensitivity of the flow meter sensor system. The slightest malfunction and the data will be distorted.

As a consequence, there is a violation of the formation regime of the fuel mixture and a sharp deterioration in the characteristics of the internal combustion engine.

What to do if there are signs of a flow meter malfunction

First of all, carry out an inspection. To do this, you need to disconnect the negative terminal of the battery, disconnect the connector of the cable going from the mass air flow sensor to the computer, and carefully remove the flow meter. On Priora it is located near the air filter housing, after which the intake manifold air duct begins. For dismantling, you will need a Phillips screwdriver (loosen the clamp of the air duct pipe) and a size 8 wrench (bolts attaching to the filter).

There should be no cracks or dents on the case, the connector contacts should not be oxidized. Dust, and possibly water or oil stains, will most likely be found inside the MAF channel. This is the main reason for the massive failure of sensors: under normal operating conditions, mass air flow sensors live a long time and do not cause problems for car owners.

A dirty sensor must be blown off dust using an intense stream of air, then carefully washed with a special product or alcohol. Washing is done with an aerosol jet (when using the product) or pressure from a syringe (with alcohol). While the device is drying, be sure to wipe off dust from the air ducts and the filter housing inside. It is recommended to combine this procedure with replacing the air filter.

Troubleshooting methods

If you don’t want to waste money on buying a new mass air flow sensor, you can try to restore its functionality. Using a Phillips screwdriver, unscrew the screws securing the measuring element to the regulator. Restoring functionality involves flushing the device, so you need to prepare a cleaning agent in advance, for example, you can use carburetor flushing liquid. The aerosol tube must be bent at a right angle in advance.

Next, the tube is heated and cut so that it is straight, but the stream is directed to the side. The tube must be inserted approximately 1 cm into the upper valve of the dismantled component, after which the resistor is washed. This procedure must be repeated several times at intervals of 2-3 seconds, but do not forget that the resistor is not able to withstand large mechanical loads. Therefore, under no circumstances should you clean the device with cotton wool, brushes or compressed air (the author of the video is the VAZ hand made channel).

Wait a few minutes for the cleaner to dry completely. When the resistor is dry, it can be replaced in place in the housing. Having done this, you can again diagnose the flow meter. It should be noted that after cleaning the controller, some characteristics of the power unit may be changed. If this is the case, then it is necessary to diagnose the toxicity of exhaust gases and adjust this parameter, if necessary.

Checking the mass air flow sensor using a multimeter

It is advisable to use a digital multimeter, with measurement accuracy up to hundredths of a volt in the range of 2, 10, or 20 V DC voltage.

1. Checking the supply voltage from the ECU controller is carried out with the connector disconnected and the ignition on, without starting the engine. At contacts No. 2 and 4 there should be 12 V and 5 V, respectively, relative to contact No. 3 (ground). This is the supply voltage of the device and the variable resistor with a platinum thread.
2. Checking the signal voltage at rest is carried out with the connector connected, the ignition on, and the engine not started. It is necessary to firmly insert the probes from the back of the connector into contacts Nos. 3 and 5.

3. A working sensor will show 1 volt ± 0.02 V. If the voltage is outside the error of 0.05 V, the sensor is faulty.

Where is the DMRV located?

The sensor is located between the air filter and the air supply hose (pictured No. 13).

Catalog numbers of mass air flow sensor on LADA cars:

• Lada Priora, Kalina and Niva 4x4 - 21083-1130010-20.
• Lada Granta and Kalina 2 - 11180-1130010-00.
• Lada Vesta, Largus and XRAY - no mass air flow sensor. Modern VAZ engines (21127, 21129, 21179) and Renault engines (K7M and K4M) do not have a mass air flow sensor; instead, an absolute pressure sensor (APS) and an air temperature sensor (ATS) are installed.