On-board computer for VAZ-2115: instructions, connection

The on-board computer was installed on the VAZ-2115 relatively recently. The fact is that the first releases of this model were equipped with engines with a carburetor injection system. They did not have an electronic control unit that could read all the information about the operation of the internal combustion engine and other vehicle systems.

The on-board computer makes life much easier for the driver. Even a person who does not have extensive experience in installing special equipment can install it. Connecting the device will not cause any difficulties, nor will setting it up. When working, you can use the operating instructions that come with the kit.

Basic information

The functionality of this device provides a lot of possibilities. Using the on-board computer on the VAZ-2115, you can determine almost all engine operating parameters. What allows you to control the device:

Vehicle speed at the current time, average value, minimum or maximum.
Fluid temperature in cooling systems and braking.
The magnitude of the voltage in the on-board network.
Fuel consumption per 100 km. Moreover, you can display both the average value and the current, maximum, minimum.
Gasoline level in the fuel tank.

These are just a few of the parameters that electronics can monitor. Using the on-board computer on the VAZ-2115, you can also check the status of all sensors of the injection injection system. Moreover, the operating instructions for the device must contain information about which error code corresponds to the malfunction of a particular sensor.

By installing such a trip computer on your car, you can get rid of visits to auto repair shops the first time the CHECK ENGINE light comes on. Every time you turn on the ignition, you see before your eyes all the errors that are present in the car’s systems. If necessary, you can erase them.

How to install and configure an on-board computer on a VAZ 2115 car with your own hands?

The operation of a car engine, as is known, depends on the performance and condition of many mechanisms and sensors. And to ensure their synchronous operation, which allows the engine to operate in the most optimal mode, monitor the on-board computer (BC). What is a BC, what is its purpose and how to install an on-board computer on a VAZ 2115 - you will find the answers to these questions below.

Almost all modern cars are equipped with these devices. As a result of the significant advantages that the installation of a BC provides, many domestic motorists whose cars are not equipped with computers resort to installing this device.

Purpose

The standard BC for "Tag" is used for:

displaying information about the operation and condition of the main units on the dashboard;
transmission of data on the operation of certain nodes in real time;
displaying information about route parameters;
if necessary, using this device you can check the condition of the power unit with further display of combinations of errors that are present in its operation.

Main settings

Briefly about the main parameters of the computer:

The device shows the speed at which the car is moving. It can also be used to determine the remaining fuel in the tank and travel time over a certain segment.
The BC shows the number of engine revolutions.
Thanks to this device, the driver can always know about the state of the temperature in the cabin, as well as the temperature of the engine.
The device determines fuel consumption in a certain area, the kilometers traveled, as well as the number of kilometers that the car can travel on the remaining fuel.
The device also allows you to determine the voltage level present in the vehicle’s on-board network.
Throttle position.
As mentioned above, with the help of the BC staff, you can determine possible malfunctions present in the operation of the power unit.
Another parameter determined by the computer is the cyclicity of air flow circulation.
Average vehicle speed.
Information about the time when the next maintenance of the machine will be required.
Information about the need to change certain parameters in the operation of various vehicle components.
Depending on the model and the data stored in its memory, the device can calculate the time when the next time the car owner will have to pay for insurance.
Various data from the organizer.

Possible faults

First, let's look at the signs of a BC breakdown:

There are no signals about the operation of the ignition system, injection or from other actuators.
There is no reaction to the operation of the oxygen controller, DTOZh, throttle sensor, etc.
There is no connection with diagnostic equipment.
The presence of physical damage - burnt out radio elements, damage to conductors or housing, etc. (video author - Pavel Myalik).

As for the reasons, there can be many of them:

Incorrect operation or presence of malfunctions in the operation of the high-voltage component of the ignition system. The problem may lie in the operation of the coil, high-voltage cables or distributor.
Moisture on the control unit.
Incorrect “lighting” of a car when the battery is dead - from a car with a running engine.
Making mistakes during electrical repairs or when installing an anti-theft system.
Another reason why the BC could fail is that the polarity was reversed when connecting the battery, that is, the plus is connected to the minus, and the minus to the plus.
Turning on the starter unit when the power bus is turned off.
If welding work was carried out on the car body, the cause may be an electrode that got into the wiring or sensors of the car.

Errors and their interpretation

Basic error symbols:

2 - the voltage in the car’s electrical network is too high;
3 - there are problems with the fuel indicator;
4 - a violation of the engine temperature regime has occurred;
6 - the engine has overheated, the car should be stopped;
7 - engine fluid pressure level in the lubrication system is too low;
8 - there were problems with the brake system;
9 - the battery is discharged.

DIY Connection Guide

Brief instructions for installing and connecting the on-board computer:

First of all, it is necessary to de-energize the vehicle's electrical network; this is mandatory, since otherwise a short circuit may occur during the connection. To de-energize the network, disconnect the battery.
First remove the car radio, and then the center console. Behind the console you will see a place to install the BC, it is provided by the manufacturer. All necessary wiring is connected to this location.
Next, remove the plug - having done this, you will be able to see the wiring harness, as well as the connector. You need to connect all the necessary plugs to the BC. In particular, we are talking about the power cord from the on-board network, power when the ignition is activated to start the BC, power from side lighting, ground, and also the fuel level controller. You should also connect the diagnostic line; if you do not do this, the device will not be able to diagnose errors and display them on the display. In addition, after connecting the device must be securely fixed. This is also important, since if the fastening is poor, the BC will be subject to vibrations that occur during movement, and this, in turn, can lead to its breakdown.
Reinstall the center console with radio. At this point, the installation procedure can be considered complete. Now all you have to do is set up the bookmaker in accordance with the operating instructions and test it (the author of the video is the flestery channel).

Dismantling

Dismantling the device is carried out according to a similar principle:

First you need to de-energize the on-board network; to do this, disconnect the terminals from the battery.
Then the center console is dismantled along with the audio system.
Through the window that appears, you will need to disconnect the power cables from the computer.
Next, the device is dismantled, and the center console with the car radio is installed in place.

As for the specific settings, this procedure will differ depending on the type and model of the bookmaker. The modern automotive market offers consumers various types of BCs, differing in cost and functionality, as well as in the manufacturer. Accordingly, because of this, the principle of setting up the device may be different. To properly set up your computer, you should carefully study the operating instructions; it will indicate all the main points of this process.

Price issue

1. One of the simplest options - Multitronics UX-7 (price - approximately 1450 rubles) 2. More functional model Gamma GF 315T (price - on average 4500 rubles) 3. Prestige V55-Can Plus (average cost of this BC model for VAZ 2115 - approximately 5400 rubles)

Video “Detailed review and features of installing the BC on the VAZ 2115”

The video below provides a detailed overview of the BC for the VAZ 2115, as well as descriptions of the nuances regarding the installation and further use of the device (the author of the video is the PRO EVERYTHING channel).

AvtoZam.com

What computers can be installed on the VAZ-2115

On sale you can find a variety of models of on-board computers for domestic cars. The most important thing is that they work with electronic control units installed on VAZ cars. You should not skimp on trip computers, since expensive devices will be able to provide thorough diagnostics of the car and promptly warn you about malfunctions. They have a much longer service life and more functionality than cheap options.

On sale you can also find on-board computers that are installed instead of the instrument cluster. They are much more convenient, since all information about the operation of the vehicle systems is in front of the driver’s eyes.

Characteristic

Model VC731

The company constantly updates its lineup and improves functionality using modern technologies. Thanks to this, these are some of the best devices on the market, working perfectly with Russian cars.

A correctly configured Multitronics BC displays all information about the car faster than standard devices. In addition, it is located in a compressed form nearby.

Models

Model VC731

As mentioned above, the BC model range from this company is very wide and is regularly updated with new products.

Here are the main features of the most popular models to help you make a choice:

On-board computer Multitronics VC731. This model can be installed on injection gasoline and diesel cars. Mounting is carried out both on the windshield and on the windshield. There is an oscilloscope function. It has a huge number of built-in diagnostic protocols, which allows installation on almost any car, for example, Gazelle, Lada.
On-board computer Multitronics VC730. Cheaper model. There is no oscilloscope function, otherwise the functionality is almost identical to the previous model.
On-board computer Multitronics RI 500. Designed for foreign and domestic cars with injection gasoline and diesel engines (supporting OBD-2). Graphic display. Easy installation and configuration, there is basic car diagnostic functionality.
On-board computer Multitronics RC 700. One of the most expensive and efficient models. Among other functions, it has voice accompaniment, that is, it can voice the meaning of all parameters. There is a function of an oscilloscope, fuel quality control and so on.
On-board computer Multitronics TC 750. This model has a screen in the center and two rows of control keys on the sides, which is quite convenient. The display is bright and clear. It has almost all the functions, including a voice synthesizer and an oscilloscope. Can remember your trips.
On-board computer Multitronics VG1031upl. Installed on cars with injection gasoline and diesel engines. Mounted on the windshield only. A weaker 16-bit processor compared to previous models. There is a fuel quality control function, a trip log and much more.

Possibilities

Almost all bookmakers from this company have a number of useful functions, including the following:

more than 40 protocols, which allows the device to be used on almost any car;
malfunction notification (voice on some BCs) about vehicle malfunctions;
voice notification about the amount of gasoline in the tank, as well as the status of various parameters;
travel log;
controls the quality of gasoline that is poured into the gas tank, which often saves from subsequent problems.

Advantages and disadvantages

Using such a device in a car has almost complete advantages for the driver. He gets full control over the condition of his vehicle and can always track the main parameters.

The disadvantages of these devices for their owners usually include an interface that is not always clear. Also, some users find it too minimal. This is probably due to technical shortcomings in processors and screens that do not allow more information to be displayed.

Typical errors of on-board computers

To check the on-board computer on the VAZ-2115, you need to completely reset the daily mileage on the dashboard and turn off the ignition. After this, you need to press the button located near the windshield wiper switch. In this case, the display shows the firmware version and error codes, if any:

If the voltage in the on-board network is too high, code “2” will appear.
If the sensor indicating the fuel level is faulty, code “3” will be displayed.
If the coolant temperature sensor fails, code “4” will be displayed.
If there is a malfunction in the temperature sensor installed outside the car, an error code “5” will appear.
If the engine overheats, the on-board computer on the VAZ-2115 will display error “6”.
If the oil pressure drops below the minimum value, error “7” will appear.
Insufficient fluid level in the brake system - error code “8”.
When the battery charge is low, the code “9” will appear.

Dismantling

The device is dismantled according to a similar principle:

First, to de-energize the on-board
network, you must disconnect the terminals from the battery.
Then the center console is dismantled along with the audio system.
Through the displayed window, you must disconnect the power cords from the computer.
The unit is then removed and the center console containing the car stereo is reinstalled.

In terms of specific settings, this procedure will vary depending on the type and model of BC. The modern automotive market offers consumers different types of BK, differing in price and functionality, as well as by manufacturer. Because of this and the setting principle. To properly set up your computer, you must carefully study the operating instructions; it will indicate all the main points of this process.

What errors appear most often?

Most often errors appear with numbers “4”, “6”, “8”. The first appears when the engine is not warm enough. An error on the VAZ-2115 on-board computer with code “6” appears when driving in city mode, when the engine overheats, as well as when there is a breakdown in the cooling system. To reset these errors, you need to hold the button for a few seconds, which resets the car’s daily mileage.

Hazard warning light - practical or not

Emergency notifications play a fairly important role in modern car computers. In particular, the driver can be promptly notified of the following:

Motor overheating when the temperature exceeds 115 degrees.
Changes in the vehicle's electrical network. The signal appears when the voltage drops or exceeds permissible limits.
Exceeding the speed limit at a preset threshold.

Also, on-board computers inform the driver about the need for maintenance. During the process of setting up the computer, indicators are indicated at which it is necessary to change the oil, air filter, and so on.

Features of connecting the on-board computer

Before connecting the on-board computer to the VAZ-2115, you need to decide what functions you need. Be sure to compare the characteristics of the car and the capabilities of the on-board computer. If you don’t have any bells and whistles on your car, then there is no point in purchasing expensive and complex systems.

Decide on the installation location of the system display, as well as the central unit. It is best to install the device in the center console, if there is space. If it is not there, then mounting on the top of the dashboard is allowed. It won’t look very nice, so it’s better to allocate space in the center console, because ease of use of the device plays a big role.

But if you have a trip computer in the form of an instrument cluster, the location of its installation has already been determined. All connection wires must be carried out in special tubes; they will protect them from the negative influence of the external environment. The electrical wiring is connected only after the unit is installed on the vehicle.

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Brief instructions for installing and connecting the on-board computer:

First of all, you need to turn off the car's electrical network, this is necessary because otherwise a short circuit may occur during the connection. To turn off power, disconnect the battery.
First remove the car radio and then. center console. For the console, you will see a location to install the BC, this is provided by the manufacturer. All necessary wiring has been brought to this location.
Then remove the plug-in after that, you will be able to see the wiring harness as well as the connector. You need to connect all the required plugs to the BC. In particular, we are talking about the power cable from the on-board network, the power source when the ignition is activated before the start of BC, the power from the general lighting, the ground, as well as the fuel level controller. You must also connect the diagnostic line, if you do not do this, the device will not be able to diagnose errors and display them on the display. In addition, after connection, the device must be securely fastened. This is also important because if the mounting quality is poor, the BC will be subject to vibration.
Reinstall the center console using the radio. This completes the installation procedure. Now you only need to configure the BC according to the operating instructions and test it.

Removing the on-board computer

If a faulty or outdated on-board computer is installed on a VAZ-2115, instructions for dismantling it are as follows:

Disconnect the negative terminal from the battery.
Remove the outer panel from the car radio.
Remove the car radio body by disconnecting the wires from it.
You need to put your hand into the hole to loosen the on-board computer housing.
Now you can remove the device and disconnect the wires from it.

Afterwards, you need to install a new on-board computer or a blank in the center console. The tape recorder can be connected and installed in its original place. A new computer requires virtually no setup.

The only thing that is needed is to calibrate the gas level sensor in the tank. To do this, completely empty the tank, set the trip computer to “0” and fill in 3 liters of fuel until it is full. When finished, the on-board computer will save the data and go into standby mode. Here's how to connect an on-board computer to a VAZ-2115 with your own hands. Similar work is carried out when installing devices on other injection vehicles.

General principles for connecting a computer

Basically, an on-board computer is an inexpensive device, but quite useful. We have already mentioned this. Now we will look at the process of installing the BC into the car.

If you have not purchased a device yet and are wondering what to choose, pay attention to Multitronics and the State. We will look at the connection process using the Multitronics X140 as an example. Note that there is now a similar modification on sale, which is equipped with a color display.

Buy an on-board computer in online stores. In car markets, the cost of such products is often greatly inflated.

The following wires need to be connected to any on-board computer:

Power supply +12 V.
Power when the ignition is turned on to start the computer.
Power that appears when the side lights are turned on. This will cause the BC display to go dark at night.
Weight.
Signal from the fuel level sensor. Some device modifications allow you not to connect this wire. Multitronics X140 calculates the remaining gasoline based on instantaneous consumption.
Connect the diagnostic line from the K-Line controller.

For the first four points, a 4-pin block is used, specifically designed for connecting a BC. Accordingly, it is enough to connect it with the adapters that come with the computer. If this is not possible, then the first point is connected from the cigarette lighter, the second - from the ignition switch, 3 - from the cigarette lighter backlight. The ground is connected from the body of the same cigarette lighter.

It is very important that before any actions with electrical wiring you need to reset the negative terminal on the battery. This will protect you and your car from short circuits and other troubles. The signal from the fuel remaining sensor is taken from the gasoline level indicator. Its location can be found in accordance with the wiring diagram of the machine.

The diagnostic line (K-Line) is connected to the EURO-3 block in the seventh socket.