Mass air flow sensor (MAF) in Priora and Kalina

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;

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.

DMRV Priora

The Priora installed two types of mass air flow sensors. The first sensors were less reliable and quickly damaged. With the transition to the E-GAZ system, more reliable and durable frequency sensors began to be installed in cars.

The external differences between the sensors are shown below:

On the left is a Priora sensor without the E-GAS system, on the right is a frequency sensor for the E-GAS system

Location and principle of operation

Location of the mass air flow sensor in the engine compartment of cars of the Lada Priora and Lada Kalina families: 1 – mass air flow sensor

Location of the mass air flow sensor in the engine compartment of cars of the LADA 4x4 families: 1 – mass air flow sensor

The mass air flow sensor is mounted at the outlet of the air filter housing , and on the other side the input air duct is connected to it, catalog number - 0 280 218 116. The cost of the original is about 4100 rubles. Also, in some cases, there may be an original Bosch mass air flow sensor with the article number - 21083-1130010-20 (used on engines without the E-GAZ system), price - 4700 rubles. On engines with E-GAZ, mass air flow sensors are installed under the article number 21700-1130010-00. Its cost is 3600 rubles. However, you can choose some good analogues:

• Zommer (21083113001020) - 1840 RUR;
• KRAFT (KT 104702) - 3200 rub;
• Bremi (30223) - 4400.

Zommer and KRAFT flow meters are cheaper, but they are also inferior in quality to the original. But the Bremi mass air flow sensor works as reliably as the original sensor and there are practically no problems with it.

Its signals are hertz pulses of varying frequency, which depend on the volume of air pumped through the sensor. The stronger the air flow, the higher the frequency of the signals. During the diagnostic process, the sensor readings are visualized as the flow rate of a certain number of kilograms of air per hour.

A controller that processes information from the temperature sensor located in the air flow sensor of the Priora and Kalina

If signals from the air meter no longer reach the controller or their decoding indicates problems with the device, the car’s ECU detects and records error code P0100, simultaneously signaling this to the driver. If the sensor breaks down, the controller calculates the amount of incoming air based on the crankshaft rotation speed and the current throttle position. This affects the operation of the engine in the following way: fuel consumption increases, revolutions increase significantly (in each case the indicators may differ) and while driving there is a loss of power and kicks.

On Priors and Kalinas there may be two types of sensors - old and new. Old hot-wire sensors were originally installed on VAZ cars produced in 1999-2004. They are found more often on Kalinas of the 1st generation. In their design, the sensitive elements are made in the form of thin platinum threads. The part numbers for these Bosch sensors were 0 280 218 004 and 0 280 218 037.

Since 2005, they have been replaced by the Bosch sensor 0 280 218 116. New HFM type sensors work on the same principle as wire sensors, but are structurally different. In the new samples, thin-film resistors are installed on a ceramic substrate and a platinum coating is applied. If from the factory the car is equipped with a sensor manufactured by AvtoVAZ and not Bosch as an original mass air flow sensor, then there are 2 types of devices:

• 21083-1130010-20 - for Lada Priora, Kalina, Niva 4x4 cars;
• 11180-1130010-00 - for Lada Kalina 2 cars.

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.

Route map for eliminating unstable XX on a VAZ 2170

Unstable idle is caused by the fact that the computer incorrectly perceives or does not know at all the amount of air sucked into the intake manifold. A typical treatment recipe looks like this:

• Check the sensors (IAC, DFID, TPS) and replace the faulty ones.
• Make sure that the adsorber valve is in good condition.
• If, after cleaning the throttle valve on the VAZ 21126 engine, the speed fluctuates, you need to make sure that there is no air leakage through the connections to the pipes.
• Check whether the diaphragm in the vacuum brake booster is intact.

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.

You can also check the frequency sensor using the ELM327 diagnostic tool; read how to do this in our article.

Verification Process

To check the sensor you will need two needles and a multimeter. The principle of determining the performance of the mass air flow sensor is carried out by measuring the voltage between the contacts.

Checking the circuit

Initially, the sensor's power circuit is checked.

• We switch the multimeter to the DC voltage measuring mode at 20V.

• Remove the connector from the mass air flow sensor.

• Turn on the ignition on the car.

• We connect one of the multimeter leads to the motor housing, and the second to Pin No. 2 on the connector (there is a numbering of contacts on the block). The voltage at Pin No. 2 must be at least 12V.

• We carry out the same procedure with Conclusion No. 4. The voltage at Pin No. 4 must be at least 5V.

If the readings do not match and are significantly less than those indicated, you should check the battery, computer and power supply circuit of the mass air flow sensor.

Sensor check

Let's start checking the sensor; to do this, connect the mass air flow sensor connector if it is removed.

• We set the DC voltage measurement limit on the multimeter to 2V or 2000mV (in different versions of the multimeter, this value is indicated differently).

• We measure the voltage between terminals 1 and 3 with the car ignition on and off. We check the readings with the table below.

Also, one of the good checks of the mass air flow sensor is to replace it with a known good one, for example from another similar car.

Mass air flow sensor DMRV VAZ engine ECM

The mass flow sensor of the mass air flow sensor (air) is located between the air filter and the air supply hose. The sensor signal is a constant voltage, the value of which depends on the amount of air passing through the sensor. The air temperature sensor is built into the mass air flow sensor, the sensitive element of which is a thermistor installed in the air flow. At low temperature, the sensor resistance is high, and at high temperature, the resistance is low. Dependence of air sensor temperature resistance on intake air temperature (permissible error 10%)

If the air temperature sensor is faulty, the computer stores a code in its memory and turns on the error warning light, and the readings of the faulty sensor replaces it with a fixed air temperature value of 33 °C. replacement For the sensor you will need: a “10” wrench, a cross-shaped wrench with a screwdriver blade. 1. Disconnect the wire from the battery negative terminal. 2. Using a screwdriver from below, using your finger or the plastic latch, disconnect the wiring block of the harness from the mass air flow sensor. 3. tightening Loosen the clamp securing the air supply hose and disconnect the hose from the sensor. 4. Unscrew the two screws and remove the sensor from the air filter.

5. Remove the rubber gasket and carefully inspect the condition of its edges, as damage to them can lead to the air filter leaking into the air. While driving, the air contains many small mechanical particles that can damage the mass air flow sensor and, as a result, lead to engine interruptions. 6. Before installing the sensor, first put the rubber seal on it and then just secure the sensor to the air filter.

The engine will begin to operate in an abnormal mode of pairwise supply of parallel fuel, when each injector fires two times more often (once per revolution of the crankshaft) - it is not possible to determine this by ear. try to lose its former purity, but it is possible to catch the increase in toxicity only by measuring the driving conditions. Understand. cycle that the engine is unhealthy can be seen in increased fuel consumption. Another sign of a failure is a malfunction in the self-diagnosis system. Failure of the sensor will lead to other unpleasant consequences for the engine.

DMRV MALFUNCTION. MASS AIR FLOW SENSOR.

Loss of agility in maximum torque and power modes; you need to press the pedal when starting the gas. The control system, reacting to its failure, “lates” the ignition by 10-12 degrees. In this case, the response to the gas pedal at the beginning of acceleration may even improve. The exhaust will become dirtier, and the engine will noticeably become more power-hungry. Without requiring the car to be as fast as it used to be, you can get home quickly, even if there are several hundred kilometers ahead. Usually the mass air flow sensor is checked with a diagnostic device (for example, DST-6).

open if the faulty mass air flow sensor manufactured by Bosch to look at the purpose. There is an electronic microassembly with unpackaged chips, capacitor microcircuits and sprayed resistors, made using hybrid technology at a high technical level. But the element itself that measures air is a very flimsy thing. This is a thin hair of thin on mounted foil. Everything was apparently done using the spraying method. The electrical conductors to this hair are thin foil. If you look at it with a good microscope, you can see numerous holes in this It. foil traces of impacts of dust particles. The picture reminds us of the lunar surface with its craters. One of my guides turned out to be simply crushed by such a large “crater”. Conclusions: 1. Rinse this is an attempt. It’s impossible to rinse, it’ll just finish off the mass air flow sensor. Hit. 2. Finally, oil in there is just as deadly for the MAF. 3. Monitor the condition of the air filter. Repair.

Replacement

• Remove the negative terminal from the battery.

• Remove the connector from the mass air flow sensor.

• Unscrew the intake corrugation clamp from the sensor.

• Unscrew the two 10mm wrench bolts.

• 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.

How to check frequency-type air flow sensor

The frequency response sensor is located after the air filter. The mass air flow sensor with the frequency response of the digital output signal can be indirectly checked with a scanner. When the ignition is on, the frequency parameter should be in the range of 915-925 MHz and at idle the frequency will change to 315-330 MHz. If the frequency readings are different, it is impossible to assert that the mass air flow sensor is malfunctioning, and in this case it would be more effective to replace it with a known-good sensor. It is quite difficult to understand the causes of a malfunction of the mass air flow sensor if preventive measures are taken, but if a malfunction occurs, it can be eliminated with a replacement device.