Multitronics on-board computer error codes. Decoding

VAZ error codes and their interpretation

Dear friends, since carburetor VAZs are already history, and the vast majority of VAZ owners, from classics to grants, are happy owners of injection engines, this does not eliminate the need to diagnose the engine and eliminate certain problems. And if earlier we simply changed spark plugs in any incomprehensible situation, adjusted the ignition and cleaned or purged the carburetor, then in an injection engine everything is somewhat more complicated, since everything is controlled by the ECU - the brains of the car. Many people acquire on-board computers, but not every bookmaker knows how to decipher errors ; most bookmakers simply show the error code , if there is one, and the car owner (or a diagnostician) will have to decipher this error And since every check error makes it expensive to go to a diagnostician, and the choice of bookmakers in the budget segment is quite large, and almost any driver will be able to purchase this useful device in a car, we are posting VAZ error codes with decoding so that you can easily identify one or another engine error.

Decoding error codes issued by the ECU of VAZ cars

Description of fault codes for controllers ME17.9.7 and M74

With On-Board Diagnostic (OBD) system

Without on-board diagnostics (OBD)

Diagnostic Trouble Codes (1.8/2.0L I4)

With On-Board Diagnostic (OBD) system

The codes shown in brackets () are only applicable to vehicles equipped with an immobilizer.

Without on-board diagnostics (OBD)

Diagnostics

If you notice that something is wrong with the operation of the Lada Kalina vehicle, then it makes sense to diagnose the car. As a rule, all breakdowns appear immediately after checking the car. You can ask for help in carrying out diagnostics at a service station, where you will pay a certain amount for this service, or you can do everything yourself. Of course, with the help of special equipment there is a greater chance of identifying a malfunction, since when checking independently there is a possibility of obtaining inaccurate data.

So, let's start diagnosing the car ourselves. For this:

1. Turn off the ignition.
2. Press and hold the daily mileage reset button.
3. While holding the button, turn the key in the ignition.
4. Having done this, all sensor indicators on the dashboard will light up, and the arrows of the tachometer, speedometer, antifreeze temperature sensor and gasoline level in the fuel tank will move on a scale from zero to maximum. Next, press the button located on the steering column wiper switch. This way you can switch the data on the instrument panel screen. On the first one you can see the process of checking the functionality of the instrument panel. The second will show the version of the software installed in the car, and the third will show combinations of faults.

To check your car for breakdowns, hold down the daily mileage button and hold it while turning on the ignition key. At this time, all arrows will go from zero to maximum.

Then press the button located on the steering column wiper switch. This is done in order to switch the data mode on the instrument panel screen.

To read combinations of faults in a car, you will need the last screen. It will display clear codes. To obtain four-digit combinations of faults, use special equipment or the services of specialists at a service station.

Correction of internal control programs (chip tuning)

Chip tuning

Chip tuning, like ECM modification, also involves changing the factory settings of the software in order to eliminate certain errors in the operation of the software. But the ultimate goal of chip tuning is somewhat different, and is to significantly increase torque and obtain maximum performance from the engine.

The cost that a car owner has to pay to obtain additional power is quite high. Often, as a result of chip tuning, fuel consumption increases significantly and the life of the internal combustion engine decreases.

Taking into account the above information, every car owner should know the answer to two questions before adjusting the injector:

Numbering, ratings and purpose of fuses

Each of the fuses in the VAZ 2107 can serve one or more electrical circuits of the car. If a fuse fails, a specific device or vehicle system (or several) will not receive power. As a result, a particular device becomes inoperable.

Fuse failure is not always the cause of a malfunction. In many cases, a blown fuse is the result of a component or system malfunction. Such cases include:

In the event of a failure of any of the vehicle systems, according to the table below and the fuse location diagram, determine the fuse number and its location in the block. If this fuse is responsible for several systems, you should check the functionality of the other system. If it works correctly, the fuse is most likely good and is not the problem. After this, using a multimeter or other measuring equipment, the functionality of the fuse is checked by measuring its resistance (continuity).

Testing the fuse should only be done on a dismantled (removed) fuse. The resistance of a good fuse is close to zero. In most types of fuses, the thread of its working area is visible through the light or is located outside the body part. You can check the fuse visually, but there are often cases of erroneous inspection when the working area has a microcrack.

Adjustment process

After connecting the laptop to the car’s on-board computer, you have the opportunity to monitor all the parameters of the vehicle in its various systems and see a list of errors that negatively affect the operation of the internal combustion engine. To identify errors, the data obtained in this way must be checked against the basic parameters. In most cases, the program itself indicates a deviation from the norm. If not, then you need to look for the error by its code in the catalog.

After determining the causes of deviations from the norm, errors can be easily eliminated by adjusting certain parameters that affect the operation of the injector.

Location of relay and fuse boxes

The location of the VAZ 2107 fuses and relays is located in the engine compartment, its article number is 2107-3722020-10. It is in an accessible location. In injection cars, an additional relay and fuse block is installed that serves the engine's electronic control unit. It is located under the glove box.

In cars of early years of production, the main relay and fuse box has a different design and arrangement of elements.

Relay on fuse box

The fuse block relays and the VAZ 2107 relays are located in the same fuse block. Their purpose:

Checking the serviceability of the relay can be done using a multimeter. To do this, it is necessary to test the armature winding. Its resistance usually ranges from 50 to 200 ohms. It is safer to test connect the winding to the vehicle's on-board voltage. To do this, the relay must be removed from the relay and fuse block. If one terminal of the winding is connected to the positive terminal of the battery, and the other to the negative terminal, you should hear a characteristic click of the activated relay. The main causes of relay malfunction:

ECU firmware

Firmware update of the electronic control unit is an opportunity to expand the capabilities of your on-board vehicle and make its operation more efficient. It must be said that the first versions of programs for firmware (or chip tuning) of the VAZ 2107 appeared back in 2008.

For most G7 owners, software chip tuning is simply necessary, since this operation allows:

• improve machine performance in all respects;
• optimize the functions of the ECU;
• reduce fuel consumption;
• extend engine life.

ECU firmware must be performed exclusively at a service center and after a complete technical inspection of the motor by specialists. Special service equipment is provided for this procedure. Self-firmware can only be performed if you have experience and modern equipment.

Diagnostic connector

The ECU on the “Seven”, like on other cars, is also equipped with a diagnostic connector. Today, all connectors are manufactured according to the same OBD2 standard. That is, the “on-board vehicle” can be checked for errors and malfunctions using a conventional scanner with a standard cord.

What is it used for?

The OBD2 diagnostic connector is equipped with a certain number of contacts, each of which performs its own function. By connecting the scanner to the ECU connector, you can carry out several diagnostic modes at once with high accuracy:

Where is

The diagnostic connector on the VAZ 2107 is located in the most convenient place for work - under the glove compartment in the cabin under the instrument panel. Thus, there is no need to disassemble the engine compartment mechanisms in order to connect the scanner to the ECU.

Basic engine malfunctions

VAZ 2107 cars are equipped with three main types of power units with a displacement of 1.5, 1.6 and 1.7 liters. The second engine is equipped with a distributed injection system, which differs significantly from carburetor engines. During long-term operation, parts and components of the unit are subject to wear, which can cause the following malfunctions:

Diagnosis of injector or ECU malfunctions is carried out using a special tester, which is available at specialized service stations. Repair and restoration work on the engine is classified as complex and requires high qualifications and special skills.