The VAZ company develops on-board computers so that fault codes for Lada 2115 and other models can be read in two ways at once. The self-diagnosis procedure involves collecting and decoding errors through the on-board display. This method is suitable for quick repairs and troubleshooting.
From 2005 to 2022, more accurate diagnostics became possible. A specially designed OBD2 port allows you to connect equipment to the car. An external computer shows problems down to every detail.
Car diagnostics
Of course, it is impossible to detect a malfunction in the operation of a vehicle without diagnostics. This can be done using special equipment, which can be found at every specialized service station. But you can also check your car for faults on your own. Note that when checking the car yourself, the error codes will not be the same as when diagnosing on the equipment.
Car VAZ 2115 tuning
So, how can you independently diagnose the state of the VAZ 2115 on-board computer? This question came to the mind of every owner of these car models. Now we will tell you about this in more detail. But diagnosing the car is half the battle, because the resulting combinations of faults also need to be deciphered.
Self-diagnosis of VAZ:
- Find the odometer button on the instrument panel. You need to clamp it down.
- Then turn the ignition key to position 1.
- Having done this, the odometer button will need to be released.
- When you release the button, the arrows on the instrument panel will start jumping.
- Press and release the odometer button again. Numbers will appear on the speedometer indicating the firmware version of the on-board computer.
- Finally, hold and release the odometer button for the third time and you can see the fault combination. In the case of self-checking, error codes will be presented in two-digit form, in contrast to diagnostics on equipment, where faults are presented in four-digit form.
Pressing the odometer button to carry out self-diagnosis of the VAZ 2115
OBDI protocol
In the VAZ-2114 and 2115 models, the diagnostic connector is located under the cigarette lighter and is covered with a special panel. To remove it, just lift the decorative cover. A VAZ car can be equipped with an old-style connector with 12 contacts of the OBDI type, which has a rectangular shape. All injection models with 8 valves are equipped with this, except those produced after 2002 with an OBDII connector.
If an error occurs that causes deterioration in the quality of exhaust gases, the standard failure code, operating parameters and external conditions will be stored in the device that records the malfunction. If a malfunction is detected that affects the exhaust gases, a failure is detected during self-testing of the device, the indicator will light continuously.
The code indicates the part that causes suspicion and the type of breakdown; the information is displayed on the screen of the device used for diagnostics. The text of the error code may vary depending on the manufacturer. Saving data is important to assist in troubleshooting.
Meaning and decoding of codes
During self-diagnosis of a VAZ 2115 with an injector, only numbers or flashes that code the error will be shown on the instrument panel. When reading trouble codes from an electromechanical instrument cluster, it is necessary to record the number of flashes and calculate error numbers from them. Their purposes can be deciphered using a special list. Most of these faults can be resolved independently by replacing failed sensors.
Self-diagnosis codes
When performing diagnostics, it is necessary to take into account that the number on the screen may indicate two summed errors. For example, 9 indicates the presence of two faults - numbered 1 and 8.
| Numeric combination | Decoding |
| 1 | ECU problem |
| 2 | Incorrect data from the fuel level sensor |
| 4 or 8 | Network power problems |
| 12 | Malfunction of the error lamp circuit in the instrument cluster |
| 13 | No signal from lambda probe |
| 14 or 15 | Incorrect data from temperature sensor |
| 16 or 17 | Problems with the network power supply, it is necessary to check for short circuits |
| 19 | Motor shaft position sensor error |
| 21 or 22 | Throttle sensor error |
| 23 or 25 | Incorrect operation of the intake air temperature sensor |
| 24 | Speed sensor faulty |
| 27 or 28 | No signal from lambda probe |
| 33 or 34 | No air flow data available |
| 35 | Idle speed control sensor is faulty |
| 42 | Ignition control circuit problem |
| 43 | Knock sensor failure |
| 44 or 45 | Violation of the composition of the mixture |
| 51 or 52 | ECU memory errors |
| 53 | Error in CO setting sensor (installed on cars without converter) |
| 54 | Octane corrector sensor (installed on cars without a converter) |
| 55 | Violation of the composition of the mixture |
| 61 | Failure of the lambda probe |
An example of error 14 appearing on the panel
Table of decoding codes for flashes calculated during diagnostics.
| Error code | Flash combination | Decoding |
| 12 | Long-pause-two short | Diagnostic circuit malfunction |
| 14 | Long-pause-four short | Engine temperature sensor malfunction |
| 15 | Long-pause-five short | Likewise |
| 16 | Long-pause-six short | Abnormally high mains voltage |
| 17 | Long-pause-seven short | Abnormally low mains voltage |
| 19 | Long-pause-nine short | Crankshaft position sensor failure |
| 21 | Two long, pause, one short | Incorrect data from the throttle position sensor |
| 22 | Two long, pause, two short | Likewise |
| 24 | Two long, pause, four short | Problem with the speed sensor |
| 27 | Two long, pause, seven short | Lambda probe failure |
| 28 | Two long, pause, eight short | Likewise |
| 33 | Three long, pause, three short | Air flow meter needs to be checked |
| 34 | Three long, pause, four short | Likewise |
| 35 | Three long, pause, five short | Idle speed outside the tolerance range |
| 43 | Four long, pause, three short | No signal from knock sensor |
| 51 | Five long, pause, one short | Memory error in block |
| 52 | Five long, pause, two short | Error in controller |
| 53 | Five long, pause, three short | Memory error in block |
| 61 | Six long-pause-one short | No signal from the immobilizer |
The data obtained allows you to quickly find the faulty element and eliminate the cause of the error.
The video from the Garage channel shows diagnostics on a VAZ 2115 using a scanner and laptop.
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Controller errors
The most common controller errors encountered during diagnostics are listed in the table.
| Program error number | Decoding |
| R 0030-0038, 0141 | Malfunction of the lambda probe heating system |
| R 0102 and 0103 | Incorrect signal from the air supply sensor |
| R 0112 and 0113 | Error in data from intake air temperature sensor |
| R 0115-0118 and 0217 | Problems detecting engine temperature or overheating |
| R 2122 and 2123, 0222 and 0223, and 2138 | Incorrect signal from the gas pedal and throttle position sensor |
| R 0171-0172 | Incorrect mixture parameters |
| R 0201-0204 | Faulty injectors (each cylinder has its own code) |
| R 0261-0272 | Problems with injector control |
| R 0130-0134 | Problems with the functioning of the lambda probe before the converter |
| R 0136-0140 | Problems with the functioning of the lambda probe after the converter |
| R 0300 | Multiple misfires |
| R 0301-0304 | Cylinder misfires |
| R 0326-0328 | Knock sensor failure |
| R 0351-0352, 2301 and 2304 | Monitoring the operation of ignition coils |
| R 0422 | Failure of the neutralizer |
| R 0691-0692 and 0693-0694 | Failure of the first and second cooling fan start relays |
| R 0560-0563 | Problems with power supply |
| R 0627-0629 | Indicates incorrect operation of the fuel pump control circuit |
| R 1602 | Malfunction in the engine parameters control controller |
Reset errors
After self-diagnosis, finding out the cause of the problem and correcting the breakdown, the errors can be reset.
To do this, go to the error viewing menu, press the odometer reset key and wait a few seconds. The number 0 will light up on the screen - the error has been reset. In this case, data about problems is stored in the unit’s memory and must be deleted. If left, the “Check Engine” light will light up in the instrument cluster. In addition, self-diagnosis may not read all electrical system errors; the error removal procedure will show whether a more detailed analysis of the vehicle’s electronics is needed.
To reset the error, do the following:
- Turn on the ignition.
- Open the hood and remove the negative terminal from the battery. Wait about a minute, connect the wire back and close the hood.
- Turn off the ignition.
- Turn on the ignition again and start the engine. The Check Engine light may come on briefly and then go off.
If the symbol remains illuminated, there is an ongoing problem with some sensor or wiring in the vehicle. It can only be found out using a special scanner. It is necessary to conduct additional diagnostics to determine the problem node. Then carry out repairs and clear any existing errors using a computer diagnostic program for the ECU.
Resetting errors on cars with an electromechanical instrument cluster is carried out by disconnecting the negative terminal of the battery from the on-board network for 10 seconds. The ignition must be turned off.
Tidy 2115: description and purpose of buttons and knobs
If everything is simple with the levers on the steering rack, there is a headlight position switch and a turn signal switch on the left. Buttons are more difficult.
Lada 2115: the oil light on the center panel is on
If an icon in the shape of a watering can appears on the console, this indicates that there are problems in the engine lubrication system. This is caused by a drop in the oil level in the crankcase or a pump malfunction. If the engine is old, the problem may be caused by clogged oil lines.
What does the exclamation mark on the Lada 2115 tidy mean?
On the "tag" the symbol is used in only one form - a red indicator in a circle. The icon indicates a malfunction in the vehicle's brake system. If this symbol lights up while driving, stop and find the cause of the breakdown. Usually it is enough to add fluid to the expansion tank or replace worn pads.
The battery light on the dash is on 2115
A red battery icon indicates that the battery is not charging properly. A complete diagnosis of on-board systems associated with the generator set and its wiring is required.
How to decipher codes
If you do not know what the data displayed on the display means, then it is pointless to independently check the functionality of the sensors. Therefore, it is important to know how to decipher combinations. The following numbers appear most frequently:
- If code 1 appears, then the fault lies in the microprocessor of the on-board unit itself. This error can be corrected by changing the computer software. It is important to use only official firmware, otherwise you will damage the entire electrical system of the car.
- If the malfunction is hidden in the incorrect operation of the fuel sensor, then 2 will appear on the display. The same number means problems with the electrical wiring, especially if it is displayed in addition to 8.
- When the voltage in the network is high, error 4 appears, and when voltage is low, error 8 appears. If you notice these data, then you need to check the generator and battery. VAZ-2115 owners most often encounter generator malfunctions. It will need to be repaired or completely replaced.
- Malfunctions in the operation of the control lamp in the diagnostic circuit are displayed on the display in the form of a combination - 12.
- Failure of the oxygen level sensor is displayed as error 13. Check the filters, most often they are the cause of this combination. Combinations 33 and 34 indicate mass air flow. In this case, you may need to replace the sensor itself. A malfunction of the controller itself is indicated by code 61 displayed on the display. Experts recommend that if one of these combinations occurs, a full check of the functionality of the vehicle components is carried out. Start with the electrical wiring.
- Car enthusiasts often encounter combinations 14 and 15, which may appear along with an indicator indicating the need to add antifreeze. It is important to interpret this malfunction correctly - the appearance of this data on the display means that the temperature in the system is increased or decreased. The reason for this may be a malfunction of the thermostat. If the node is not damaged, then the problem most likely lies in the control unit.
- Combinations 16 and 17 are output when the voltage in the on-board network is insufficient or too high. It is necessary to check all wiring for short circuits and breaks.
- Code 19 occurs if the crankshaft position sensor does not respond correctly to the test. In this case, it is necessary to check the vehicle with an external device. If it shows a combination in the range from P0340 to P0343, then the breakdown may be hidden in the controller itself.
- With error 24, the on-board computer stopped receiving data about the vehicle speed.
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Incorrect data during self-diagnosis
According to reviews from experienced VAZ-2115 owners, the on-board computer on this model cannot be called perfect. They recommend not relying entirely on self-diagnosis, since the data obtained from it does not accurately indicate problems with transport nodes.
The self-diagnosis system is based on signal processing from common sensors. They are unable to convey the specific data needed to accurately identify the problem. There are imperfections in almost every node. Several controllers are located on the air system and the fuel injection mechanism. They can fail both in the event of a serious breakdown or in the event of a broken conductor.
Most often, VAZ-2115 owners have to deal with incorrect operation of the generator. It is this unit that often produces too low or high voltage, which causes malfunctions of all controllers.
Removing the error from the device memory
This procedure is used in three cases:
- the occurrence of an error blocks the ability to operate the car (you need to get to the service station under your own power);
- a complete check of all components was carried out and no fault was found;
- The damaged part has been repaired or replaced.
To reset the on-board control system data, you must remove all terminals from the battery and then plug it back into the vehicle's power circuit. It will only take a few seconds to disconnect the battery. After this, the error record will be erased from the system memory. If you want to carry out this procedure for further operation of the vehicle, then remember that the trip should be short - to the nearest car service center.
The cost of diagnosing errors for VAZ at service stations in Moscow and St. Petersburg
Approximate prices for computer diagnostics:
| City | Company name | Address | Phone number | Price |
| Moscow | North Motors | St. Dubninskaya, 83 | +7 | 2500 rub. |
| Silver elephant | St. Pyalovskaya, 7 | +7 | 3500 rub. | |
| Saint Petersburg | Automagic | St. Uchitelskaya, 23 | +7 | 2000 rub. |
| ClinliCar | Bolshoy Sampsonievsky Ave., 61k2 | +7 | 3000 rub. |
