We install DBP and DTV instead of DMRV: profitable modification of the car

Domestic cars seem to be specially created for tuning. Almost half of the owners sooner or later come to various modifications to factory solutions: this especially applies to VAZovods. One of the popular modifications is the installation of DBP and DTV instead of the standard mass air flow sensor.

Let's understand the terms:

• Mass air flow sensor, almost no modern injection engine can do without it;
• DBP - absolute air pressure sensor;

• DTV - air temperature sensor (can exist separately, or be integrated into the mass air flow sensor).

The designers of the car plant provided only an air flow meter, why do many VAZ owners try to get rid of it in favor of an absolute pressure sensor?

Installing an absolute pressure sensor instead of a mass air flow sensor

• Mass air flow sensor, almost no modern injection engine can do without it;
• DBP - absolute air pressure sensor;
• DTV - air temperature sensor (can exist separately, or be integrated into the mass air flow sensor).

The designers of the car plant provided only an air flow meter, why do many VAZ owners try to get rid of it in favor of an absolute pressure sensor?

Design features, main faults and their symptoms

Often the first sign of a breakdown is the appearance of the Check Engine light. But it is also advisable to perform testing if:

1. if the engine stalls at idle;
2. gasoline consumption has increased;
3. when changing gears the car stalls;
4. acceleration dynamics dropped.

Knowledge of the design of the mass air flow sensor will allow you to more accurately determine malfunctions. This is an insufficient signal level or complete failure of the device.

Purpose and principle of operation

combined in one housing, which is installed on the receiver of the intake module.

DBP output signal

is a DC voltage in the range of 0.15..4.6 V, the value of which depends on the pressure in the inlet pipe. Using this signal, the ECU calculates the amount of air sucked into the intake pipe per cycle.

If a malfunction occurs in the sensor circuit, the ECU stores its code in its memory and turns on the warning light in the instrument cluster. In this case, the control unit calculates the amount of intake air based on the crankshaft speed and the throttle opening angle.

Sensitive elements of DTV

in the inlet pipe there is a thermistor (a resistor that measures resistance depending on temperature)

The output signal of the sensor connected to the control unit is a DC voltage in the range of 0.3...4.9 V, the value of which depends on the temperature of the air passing through the sensor.

If a malfunction occurs in the sensor's electrical circuit, the ECU stores its code in its memory and turns on the warning light in the instrument cluster. In this case, the control unit will replace the sensor readings with a fixed air temperature value (32°C).

Connection diagram for the adapter cable in a convenient form.

To connect to the receiver, I used a fitting and a tube that goes to the DBP, a regular tube for supplying water to windshield washers. Ideally, it should not be long.

At this particular point in time, AvtoVAZ has switched to a system without a mass air flow sensor and uses a pressure and air temperature sensor on engines 21127 and later. A very convenient solution that combines both necessary sensors in one housing, i.e. DBP and DTV; you only need to drill two holes in the receiver, one for mounting the sensor and one for measuring pressure and temperature in the receiver. Articles DADA 127 motor 21800-1413010-00, Delphi 28234360 63521 SNG

Electronic engine control unit (ECU)

The electronic engine control unit is the brain center of the entire car. All sensors installed in the car are connected specifically to this unit. All necessary calculations and consequences are calculated in the ECU. The engine control unit corrects all its operation. Located at the bottom of the VAZ 2114 dashboard at the feet of the front passenger.

Symptoms of ECU malfunction:

Signs of an ECU malfunction include all of the following signs of sensor malfunctions. After all, each sensor transmits readings to the ECU, and it, in turn, must process them, but it happens that for some reason these processes may not be processed in the ECU. In case of such problems, the ECU must be repaired, the tracks must be soldered, or failed radio components must be replaced.

Antenna for reception

To directly receive the signal you will need a digital universal car TV antenna. It is considered the best option for use and can ensure the operation of any decoders.

The designs work with dvb t2 set-top boxes, and the car antenna itself can be offered in several versions:

• External, mounted on the body or glass.
• Internal, it is used inside the car.
• Universal - can be installed both outside and inside the cabin.

The device provides signal reception according to the dvb t2 standard, after which the car antenna amplifies it to improve quality. This ensures full use of the system and excellent channel performance.

The digital TV antenna is available for the car with moisture protection. This eliminates the possibility of its breakdown as a result of adverse weather influences, and in this regard the car enthusiast will not have any problems.

Advantages and disadvantages of absolute pressure and air temperature sensor

First, let's determine what advantages absolute pressure and air temperature sensors have over traditional flow meters. These advantages and disadvantages will allow you to determine what is best to install on your car and whether it makes sense.

So, let's start with the advantages:

1. The first advantage is the cost of the sensors. For example, for VAZ cars the cost of a mass flow sensor is about three thousand rubles. While DBP and DTV can be purchased in total for about 1,600 rubles.
2. Service life. Problems often occur in the operation of mass air flow sensors - the device fails due to being clogged with dirt, and the sensitive element of the regulator may also wear out. If the mechanism becomes clogged, then, in principle, it can be cleaned, but if the problem lies precisely in the sensitive component, then it is unlikely to be replaced. In any case, the service life of flow meters is always limited. If we take into account temperature and absolute pressure regulators, they are usually installed for the entire life of the vehicle.
3. Installing two regulators instead of one flow meter, as practice shows, allows for smooth idling on camshafts with the so-called “evil” phase, from 290 degrees and above.
4. Excellent responsiveness of the gas pedal when pressed. Car owners who have already switched from mass air flow sensors to regulators note that such a system works faster, without “brakes”.
5. More optimal operation of the power unit after replacement. A correctly installed system quickly calculates the required volume of air flow, accordingly, this will lead to the engine crankshaft spinning much faster. As a result, the power unit will produce higher power.
6. Many car owners, after installing DAT and DTV instead of a flow meter, note that at idle speed the power unit operates much quieter. However, this advantage should not be taken as mandatory, since it depends on the efficiency of the engine, as well as its design features.
7. Installation of such a system is possible on turbocharged engines.

Screenshot of the control unit settings during flashing
These are the main advantages of switching from flow meters to DAT and DTV.

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• ─ from Niva, catalog number 21214-1413110;
• ─ from Daewoo Nexia 25037223;
• ─ DTOZH VAZ (turbine needs modification).

You will also need:

• ─ Speed ​​sensor connector (for DBP);
• ─ Connector for coolant temperature sensor (for DTV);
• ─ Vacuum hose and tee;
• ─ Wire about 2.5 meters;
• ─ Lyra type terminals.

Checking with a multimeter

Of the entire list of sensors in a car, the DMRV is the most expensive. Its cost in auto parts stores reaches 3000-4000 rubles. There is also a possibility of purchasing a counterfeit or inappropriate spare part model. Before the replacement procedure, you should make sure that the element gives the correct readings on the multimeter. A step-by-step check of the sensor using a multimeter looks like this:

• To begin, set the multimeter to DC measurement mode (readings up to 20 V);
• Use a red probe to connect to contact number 5, and connect a black probe to the third contact;
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• Without starting the engine, turn the ignition key to the last position.

For a convenient interpretation of the readings from the multimeter, we will provide a complete table of voltage showing the wear of the part.

This element is quite sensitive to dirt, oil and other debris. To prevent its early failure, you should change the air filter more often and monitor the wear of the engine piston group. When there is a lot of wear, oil begins to seep into the intake system, which makes it impossible to take accurate readings of the incoming air.

You can change the mass air flow sensor yourself in a matter of minutes, so there is no need to rush and purchase a new part. Often the problem with floating speed and periodic engine shutdown at idle lies in other malfunctions. Make sure the wiring is intact, the readings are correct, and only then proceed to replacing the element. Below we present the air volume indicators that correspond to the normal operation of the 2114 engine.

MAF or DBP which is more economical and better for VAZ

The purpose of the DTV is clear: it simply monitors the temperature; the MAF and DBP can work both with and without it.

Note that both sensors (mass air flow sensor and air pressure sensor) perform a similar task: determining the mass volume of air for the ECU controller. The engine control unit, in turn, forms the correct proportion of the fuel-air mixture.

• standard installation at the factory, the ECU firmware is not damaged;
• ideally configured, does not require manual adjustment of parameters;
• allows maximum fuel economy;
• Replacing the sensor (in the event of a malfunction) does not require qualifications.

Advantages of switching to DBP (no matter with or without DTV):

• low cost of the sensor (compared to the mass air flow sensor);
• long service life: pressure sensors operate for almost the entire service life of the vehicle;
• the ability to tune the engine according to power parameters;
• improvement of power and torque characteristics (according to reviews from car owners).

How to switch from DMRA to DBP and DTV

Usually they use a sensor from GAZelle cars. It is inexpensive and can be easily placed in the engine compartment of any VAZ. There are restrictions on compatibility with ECU controllers:

• January 5.1 2112-1411020-41 and 5.1 2111-1411020-61 - compatible without restrictions;
• January 7.2 - firmware needs to be changed;
• January-5 2111-71, 2112-71 and any BOSCH are not compatible.

The DBP housing is fixed under the hood in a place protected from vibrations and moisture. The sensor fitting is connected with the help of a newly embedded fitting on the engine air receiver. The DTV is installed in place of the mass air flow sensor electronics, directly into its body.

To connect the electrical part, you will have to slightly modify the ECU connector. The connection diagram is shown in the illustration (for January 5.1 *** –41 and 5.1 *** –61).

After connection, you need to configure the ECU. This operation should only be performed by a qualified specialist.

Sensors, their purposes and malfunctions

Let's now talk in more detail about each of the sensors, let's look at where they are and what they look like.

Idle speed (IAC)

The device is located in the throttle assembly. It is a small induction coil with a needle inside. Depending on the controller readings, one or another voltage is applied to the coil winding and the needle extends a certain distance into the throttle pipe, regulating the air supply. With this, the idle speed is adjusted.

Idle speed control

There is no indicator responsible for this sensor. Therefore, if this node fails, then this can be understood by the following “symptoms”:

• The engine stalls at idle or when changing speed;
• “Floating”, unstable idle speed;
• When turning on a cold engine, there is no increased speed.

To replace the sensor, you must turn off the power to the machine's wiring, completely disconnect the throttle assembly, and then remove the sensor from it, after first disconnecting the terminals that supply electricity to it. In place of the old sensor, you need to install a new device and place the throttle assembly in place.

Detonation (DD)

The knock sensor is located between the cylinders on a car engine and reacts when the fuel detonates inside the cylinder. In essence, it is a piezoelectric element. When gasoline detonates, the sensor converts the resulting vibrations into electricity. Current is supplied to the on-board computer and signals a fuel explosion. After this, the ignition timing is automatically adjusted.

If this type of sensor breaks down, the fuel begins to detonate in the engine. To check the device for functionality, you need to disconnect it using a key from its mounting location, connect it to a voltmeter and knock on it. If voltage was applied to the voltmeter, then the unit is working; if not, it is faulty.

To replace a device, you need to unscrew it from the seat using a key, disconnect the terminals from it and install a new device.

Oxygen (Lambda probe)

The oxygen sensor, also known as a lambda probe, is installed on the exhaust pipe close to the cylinders. It measures the amount of oxygen contained in exhaust gases and the environment. It only works when the engine is on, as it must be heated to function. When oxygen molecules hit the sensor, electricity is generated, which is supplied to the control unit. The on-board computer, based on sensor readings, regulates the supply of oxygen to the engine cylinders.

Specialized car radio and features of standards

Before choosing a suitable tuner, you should decide on its standard. Let's compare a digital TV tuner used for a car and a satellite analogue.

It turns out that a car radio with a tuner according to the dvb t2 standard is best suited for use in the city. Digital receiver

It turns out that a car radio with a tuner according to the dvb t2 standard is best suited for use in the city. A car dvb t2 car radio will cost the buyer a small amount, and the set-top box can work with any signal formats.

A set-top box with dvb t2 technology for a car can be used with a signal up to high quality 1080p. In fact, the broadcast occurs in MPEG-2 and MPEG-4. But still, the receiver has a good foundation for the future.

You can purchase a dvb t2 receiver for your car in regular stores. Prices may vary depending on the model and its parameters.

How to check the air sensor yourself

So, if the driver exhibits the signs discussed above, then the sensor needs to be checked. By the way, it is important to understand that the symptoms of a malfunction of the VAZ 2114 DMVR can be very similar to the symptoms of malfunctions of other components of the car. For this reason, diagnostics are necessary before starting repair work.

• contact “5” - supplying an incoming signal from the electronic control unit (yellow wire);
• pin “4” - power supply to the device (gray or white wire);
• contact “3” - grounding (green wire);
• contact “2” - transfer of information from the sensor to the main relay (pink-black wire).

To check the VAZ 2114 mass air flow sensor using a multimeter, do the following:

• Set the multimeter to DC measurement mode up to 20 V.
• connect the red wire from the multimeter to pin “5”, and the black wire to pin “3”;
• Turn the ignition on without starting the car and look at the multimeter readings.

Decoding multimeter readings:

• tester reading from 0.006 V to 1.01 V - the voltage of the new sensors, after several operating weeks the voltage increases by several hundredths of units;
• tester reading from 1.01 V to 1.02 V – normal operating voltage of the sensor under normal operating conditions;

Then, based on the indications, appropriate repair work is carried out. In some cases, you can limit yourself to cleaning, checking contacts, etc. Others will require a complete replacement with a new device.