Why does the check light come on in a Priora, but the engine runs fine? Explanations of the reason

When you turn the ignition key of a Priora car, all electronic systems are checked and the check light comes on for a few seconds, this is normal, as it should be. It’s bad when the check light doesn’t light up when you turn on the ignition, which means the check system isn’t working.

If the checkbox on a Priora comes on and is lit when the car is started, the owner immediately falls into panic for some reason - at least in most cases. There's no need to panic, but I wouldn't recommend not paying attention. The engine has 16 valves - Priora is equipped with sensors in many components and this may indicate a breakdown. The check light is on on the dashboard of the Priora car, bottom left. Sometimes the check light comes on, you look, and it just drove through a puddle and the knock sensor got wet. The check light is on, it blinks when cold, but there is no need to panic, we need to look for the reasons. Let's make a reservation right away: there are false positives. Read the article and find out all the reasons why the check engine is triggered.

check engine on a Priora - looks like this

Checking the oil level and condition

The next most important reasons for the signal are considered to be overheating of the motor and a decrease in the level of lubricating fluid in the internal combustion engine. It is recommended to check the engine temperature. If there is no overheating, you need to check the volume and condition of the oil. After checking the level, it is necessary to add the missing amount of lubricant. Using a clean paper napkin, the quality and composition of the engine oil is checked according to the following criteria:

Color.
Consistency.
Presence of mechanical inclusions.
The smell of burning.

If everything is in order with the quality and quantity of oil, the engine starts to eliminate unusual sounds and noise when operating both at idle and under load.

If unusual noise effects of a running engine are detected against the background of a burning check, it is recommended to send the car to the nearest service company. Moving the car yourself is not recommended; delivery is carried out by towing or other convenient method. Further operation can lead to serious damage and costly repairs to the elements of the power unit.

Allow the check engine light to go off on its own.

Wait until the “check” goes out on its own. The simplest method because you don't have to do anything. The computer system in most vehicles will automatically recheck for problems that may activate the error light. If it is a minor problem, it will automatically correct itself and the check will go off. However, if the check light is still on after three days, you need to apply the methods mentioned above to reset it.

If this continues to happen despite the following reset procedures, you should take your vehicle to your nearest auto repair shop and have it diagnosed by a professional mechanic. Professional diagnostics use more sophisticated tools and can identify precise problems.

REMEMBER: You can always contact our car service center, where your car will be happy to receive professional technical assistance. You can also make an appointment with us for a scheduled technical inspection! Please familiarize yourself with our car repair and diagnostic services.

To check instrument panel error codes, you need to enable test mode. To do this, you need to press the daily mileage reset button and, without releasing it, turn on the ignition. All familiar positions should light up on the liquid crystal display (LCD), and the arrows of the tachometer, speedometer, coolant temperature indicator and fuel level indicator should move from minimum to maximum values and back. The serviceability of the LCD and the above sensors is visually checked.

Press any key to switch functions of the on-board computer (BC). The program version is displayed on the LCD.

Press the BC function switch button again. The LCD should display (if present) the following error codes:

2 – increase the voltage of the on-board network,

3 – fuel level sensor error*,

4 – coolant temperature sensor error*,

5 – error of the external temperature sensor (if there is no sensor reading within 20 seconds, indication on the LCD is “-C”),

6 – engine overheating**,

7 – emergency oil pressure**,

8 – brake system defect**,

9 – battery is discharged**,

E – detection of an error in a data packet stored in EEPROM.

*- if an open circuit of the sensor is detected within 20 seconds

**- the criterion for triggering the acoustic alarm is met

If necessary, you can reset error information. To do this, press and hold down the daily mileage reset button for 3 seconds.

The next time you press any of the BC control buttons, all familiar positions should light up on the LCD - the system has returned to its initial state.

If you do not press any control buttons for approximately 30 seconds, the instrument panel enters the operating state.

Signs

How do you know if the engine is leaking? With such a malfunction, the check engine light does not always flash. Therefore, it is important to know third-party signs that may indicate a problem:

Increased engine vibration. It is significantly noticeable at low and idle speeds.
Spark plug color change. After removal, its head will be dark. Since the mixture does not ignite, the candle becomes covered with soot and soot.
Increased fuel consumption. This sign is related to the previous one. Since the mixture does not ignite, it simply goes into the exhaust pipe.
Loss of engine power. Since the engine runs on three cylinders, it does not have enough energy to produce the required torque.
Exhaust sound. He will be unstable.
The appearance of black or thick white smoke from the exhaust pipe.
Intermittent jolts during acceleration and even motion. This symptom also indicates a misfire. This error is often related to the ignition system.

It is worth listening carefully to the nature of the engine. If the friction increases at medium and high speeds, it can be assumed that the valves in the engine are not working properly. One simple reason is increased valve clearance.

Diagnostics using a computer

If your car is equipped with a modern control unit, then this greatly simplifies troubleshooting; otherwise, you will have to use time-tested old-fashioned methods.
By connecting the computer to the car, you can find out in which cylinder, 1, 2, 3 or 4, and for what reason there are misfires, for example, the ignition coil or one of the injectors has failed.
But in any case, before going to a car service center, you need to check the condition of the spark plugs, injectors, high-voltage wires, how the exhaust system works, and whether there is smoke from the exhaust pipe.

Many car owners cannot afford instruments for car diagnostics, these include scanners (software and portable), motor testers, oscilloscopes, gas analyzers and other devices, and you need to be able to use them, read error codes, and so on. Although if you look into it, there is nothing complicated there.

The scanner is connected to a special connector, which can be located in different places in each car model, but it has one function: diagnostics.
Next, error codes are read from the control unit and decrypted.
For example, VAZ 2110, 2114, 2115, Lada Kalina, Priora, Granta cars have the following error codes that are characteristic of misfire:

P0300 - a large number of misfires;
P0301, P0302, P0303, P0304 – misfires in cylinders 1, 2, 3 and 4, respectively;
P0300 - a large number of misfires in a random order;
P0301, P0302, P0303, P0304 – misfires were detected in 1, 2, 3 and 4, respectively;
P0363 – see point 4, the fuel supply to the problem cylinders is stopped;
P1301, P1302, P1303, P1304 – respectively, misfires dangerous for the catalytic converter were detected in cylinders 1, 2, 3, 4;
P0300, P0301, P0302, P0303, P0304 – detection of misfires affecting the toxicity of exhaust gases;
P0363, P1301, P1302, P1303, P1304 – the same as in point 7, but affecting the catalyst;
P0351, P0352, P0353, P0354 – open circuit in the ignition coil in the control circuit 1 (1-4), 2 (2-3), 3, 4;
P2301 P2303 P2305 P2307 - short to on-board network in the coil in the control circuit of cylinders 1 (1-4), 2 (2-3), 3, 4;
P0201, P0202, P0203, P0204 – respectively, open circuit for controlling injectors 1,2,3,4;
P0261, P0264, P0267, P0270 - short circuit of the injector control wires to the body, respectively, in the 1st, 2nd, 3rd, 4th center;
P0262, P0265, P0268, P0271 – the same as point 12, but only to the on-board network;
P1500 – electric fuel pump relay, wire break.

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Why is the check engine blinking and the engine shaking? The car started to slow down

Engine damaged

, check

, the engine does not pull, it jerks. I turn off the ignition. , I start it again and it’s fine.

There is no flash in the cylinder - check if there is fuel. At a normal compression level, you need to test the operation of the accounting power system. Focus on the air filter and pipe: are the clamps tightened tightly, what is the condition of the purifier box, is the air intake from outside adjusted. The tubes located on the throttle assembly are made to be firmly fixed to it. Traces of fuel leaks, visible cracks and chipped plastic are unacceptable.
The engine may stall
due to a clogged injector. For this reason, specialists categorically do not accept filling the tank with cleaners sold for injectors. In fact, no cleaning occurs - the contaminants peel off in the tank, and then the fuel line becomes clogged. There is a build-up in the small nozzle and it will get stuck.
The winding of the injector parts burned out.
Low quality fuel.
Test the spark plugs.

What to do when the Lada Priora engine troits

Lada Priora engine repair

in artisanal conditions it depends on the cause of the malfunction:

If the combustion of the windings of the injector parts is to blame, remove the cover, and then remove the manifold. Assess the condition of the windings and measure the resistance using a multimeter. The best resistance level is from 11 to 15 ohms. At the lowest level of values, the winding must be replaced.
If the resistance indicates normal characteristics, remove the fuel rail and thoroughly wash each part with water. However, it is harmful to take on a deficiency in this category if you do not have the ability to repair it - be as careful as possible. For flushing to be successful, open the valves suitable for the nozzle, and then apply an aerosol-type flush under pressure.
If you have doubts about fuel, completely drain the old one and fill the engine with 8 or 16 valves of 95 gasoline. A high octane number is not advisable; on the contrary, this option may lead to overheating of the engine. If changing gasoline does not help, then change the air and fuel filter units.
How to check if a spark plug is working properly? It’s actually simple - let the car cool down well, otherwise, when you start unscrewing the elements, you can get a severe burn. After switching off, after just a little ignition, the faulty spark plug will be moistened with gasoline. Also see if the candle can create a spark.

If it is impossible to repair the spark plug so that the engine stops firing , it is completely replaced, and it is not at all necessary to go to 100. Armed with a 10-12 key, turn off the elements responsible for the ignition. Then carefully clean the spark plug from dust, otherwise debris may get into the Lada Priora

A tire compressor is suitable for this procedure; in the latter case, a brush. Then remove the spark plug with a spark plug wrench, where the head with the gasket is certainly fixed. New devices are installed with the same screwing.

There is a special offer on our website. It is possible to get a free consultation with our corporate lawyer by simply asking your own question in the form below.

PRINCIPLE OF OPERATION OF CARS WITH ECM (ELECTRONIC ENGINE CONTROL SYSTEM)

Cars with conventional carburetor engines have been replaced by cars in which fuel enters the cylinders through a system of nozzles (injectors). And sparking occurs not in the distributor (distributor), but in a special ignition module. This rather complex system is controlled by a special intelligent unit. You could say it's a computer. It is he who sends signals to trigger all actuators. Therefore, the entire ECM system can be divided into three parts.

Computer (ECU).
Actuators (injectors, spark generators, etc.).
Sensors (Air, oxygen, throttle opening, crankshaft position, etc.)

Allow the check engine light to go off on its own.

PURPOSE OF THE CHECK ENGER WARNING LAMP ON PRIOR

What does the “Check” indicator light have to do with this system? The most direct. The fact is that this lamp is directly connected to the ECU (electronic control unit). This warning light comes on when the ignition is turned on. This gives a signal that the main unit is ready for operation. After starting the engine, after 2-3 seconds, the lamp goes out. This means that the motor and all devices are operating normally. And you can safely continue moving.

IF THE LIGHT IS ON

But when the warning light does not go out while the engine is running, or lights up while driving, this means that one of the computer-controlled components is not working correctly, or has generally failed. Literally, “Check Anger” means check the engine.

Attention! The ECU mostly notes faults in its system. It is unable to respond to most mechanical engine failures.

It is a mistaken opinion that the “Check” lights up when one sensor breaks down. You need to know that this signal can appear for a very large number of reasons! In general, if you read it correctly, from English, this signal, “Check Angier,” means “Check Engine.”

Important! Only computer diagnostics provides accurate information about the breakdown.

HOW TO DIAGNOSIS THE ECM

Of course, the most correct action if the “Check” signal lights up on the instrument panel is to go to a service center for diagnostics. There, through a special adapter, a desktop computer or laptop equipped with a licensed program will be connected to the Priora ECU. And they will be able to “talk” to the Priora ECU.

However, at the moment, small mobile devices have appeared in the car accessories market. Of course, they are not able to conduct a full-scale diagnosis of the Priora. But they are quite capable of reading error codes from the ECU memory. Then you just need to decipher the codes correctly. This is the case if the diagnostics provides them in digital format. In this case, you can turn to the Internet.

What is Check Engine?

This unexpected and unpleasant combination of words for a car enthusiast that lights up on the instrument panel literally translates as “check the engine.” The designation implies the presence of sensors and systems that monitor the state of the power unit and notify the on-board computer about this. After starting the engine, this indicator should go out in operating condition.

What does the Check Engine light mean?

To start the engine, the driver turns on the ignition. If the check engine light is flashing at the same time, this should not cause concern, since it will soon go out. But a burning signal while the engine is running indicates problems with its operation.

If a malfunction occurs in the operation of the power unit, an error is recorded in the memory of the control unit in the form of a coded signal. In this case, the check engine light appears on the dashboard. If the car does not have diagnostics in automatic mode, you need to connect a scanning device to a special connector. The scanner reads the code and provides a detailed explanation of the error.

With the development of electronics, the Check Engine indicator has evolved from a simple fault sensor into a warning lamp with many functions. When a modern check engine light flashes, it reports the following inconsistencies:

incorrect composition of fuel mixtures;
settings failures in the ignition system;
sensor failures.

His duties also include reporting problems not related to the power unit. To identify the location and nature of the breakdown, the technician will need professional knowledge, experience, special devices and tools.

Important: The ECU electronic unit commands the indicator to flash as a result of detecting errors of varying degrees of complexity. Among them there are problems both serious and minor. In order to carry out diagnostics, it is recommended to suspend operation of the vehicle. Experienced car owners often independently determine the reason for the inclusion of a check, without waiting for a visit to the service station.

Purpose of the Check Engine Warning Alarm

When the Check Engine warning light appears, it indicates an engine malfunction; in such a case, driving the vehicle is not recommended. The driver should turn off the engine and take the car to a service center using a tow truck. The problem is that when such an alarm lights up, a message about a specific breakdown is not displayed. As a result, you have to carry out a complete diagnostic of the engine, often this is an expensive job, and it is not always possible to determine existing problems in the engine even on a special computer.

Reasons why the engine “troubles”

The engine may throb constantly or from time to time. General signs of engine vibration are as follows: at idle speed, strong uneven vibrations begin to penetrate from the engine compartment into the cabin, the sound of the running engine changes (it “growls”, goes from high “notes” to low ones, and back).

Error code: Diagnostic truck scanner buy :: Price of truck scanners

The unit begins to consume more fuel, and its power decreases, and obscene sounds are heard from the exhaust pipe, accompanied by thick white or black smoke. If at least one of these signs is present, it means that the “heart” of your car has problems with one or more cylinders.

If they are not eliminated in time, the consequences can be very disastrous - up to and including a major overhaul of the power unit.

internal combustion engine

Let's characterize the most common reasons why an engine stalls - there are four of them:

late or early ignition of the air-fuel mixture (FA);
uneven entry of fuel into the engine cylinder;
lack or excess of air in the combustion chamber of the cylinder;
drop in compression level.

Let's take a closer look at them.

. If the air-fuel mixture ignites in the cylinder earlier or later than the specified period, then the spark plugs are to blame, which produce too weak a spark, or the formation of a spark occurs untimely. Weak sparking occurs due to the fact that harmful deposits (carbon deposits) accumulate on the spark plug body and its electrodes, which interfere with spark breakdown.

carbon deposits on candles

Another reason for a weak spark is the destruction of its insulator. In the place where the insulator has collapsed, a soot spot forms, which prevents the formation of a normal spark.

If there is no spark at all, then there may be several reasons: a worn spark plug cap, a failed high-voltage wire (supplies current to the spark plug), a breakdown of the ignition coils or switch.

The latter phenomenon is quite rare, but it would not be superfluous to check the condition of the switch, which controls the ignition distribution.

. Uneven entry of fuel into the cylinder, when a smaller amount of gasoline or diesel is poured into the combustion chamber, often occurs due to a malfunction of the fuel pump parts (pressure part or pressure reducing valve) or the pressure valve in the fuel supply system.

If more fuel than necessary gets into the cylinder, the problem probably lies in the fuel injectors - they are dirty or out of order.

Finally, another “fuel” reason for engine throttling is a malfunction of the electronic control unit (ECU) of the power unit, which can erroneously increase or decrease the supply of gasoline/diesel to the cylinder.

. Excess air in the cylinder is a sign of depressurization of the air supply system, which includes the air filter, intake pipe hose, throttle pipe and receiver. A lack of this important component of the air-fuel mixture in the cylinder can be caused by a dirty air filter or broken throttle valves.

air filter clogged

A malfunction of the mass air flow sensor or throttle position sensor, which the ECU perceives as a request from the engine to add or reduce the amount of air into the combustion chamber, can also cause the engine to trip.

. Low compression or its complete absence is perhaps the most serious reason why an engine misfires. This is the first sign that the pistons or valve in an idle cylinder are burnt out, or the piston rings are completely worn out.

This cannot be done without serious repairs to the power unit. In addition to the common reasons why an engine misfires, there are also secondary ones. They are spoken of when the engine starts to run periodically - “cold” (at idle speed) or “hot” (at medium or high speed).

The most common malfunction here is the valves: when their gap increases at idle speed, the engine trips, which goes away as it warms up (the gap is restored).

And vice versa, the gap increases when the engine reaches operating temperatures - that’s when it starts “hot” with all the signs described above.

Diagnostics of VAZ 2109, 2110, 2114, 2115, Kalina, Priora, Granta

Let's look at misfires using the example of the VAZ 2109, 2110, 2114, 2115, Kalina, Priora, Granta models.

The computer generated error P0303 (misfire in 3rd crank).

First you need to understand how the ignition coil works. It consists of two small coils, pins 1 and 4 are connected to the first, and pins 2 and 3 to the second.

Those. during operation, voltage is simultaneously supplied to the first and fourth cylinders or to the second and third.

We have misfires in cylinder 3. Remove the wires from 2 and 3 and swap them.

Start the engine and see if the error has moved to cylinder 2, then the problem is most likely in the high-voltage wires or in the coil itself, and they need to be checked first.

High-voltage wires are tested by checking their resistance. To do this you need a regular multimeter.

Set the resistance measurement mode to 20 kOhm.

In our case, we check the third wire. If the device shows numbers within the range of 3.5 - 10 kOhm, then the wire resistance is considered normal, otherwise it changes.

Next we check the coil. For this you also need a multimeter.

We measure the resistance between 1 and 4 and 2 and 3 coil terminals. Readings of 10 kOhm, or around this figure, are considered standard.

Important. During testing, the tester should not show 1. This means that there is an open circuit in the circuit and the coil is faulty.

Next we check the resistance between each terminal and ground. In this case, on the contrary, the multimeter should show 1 (infinity).

If resistance is shown at one of the terminals, it means that its insulation is damaged and it is connecting to ground. Accordingly, the required voltage will not be supplied to form a spark.

Next, we check the resistance between the central terminal of the ignition coil and the housing (ground). It should also be equal to infinity, i.e. 1.

Now it remains to check the resistance between the extreme terminals. To do this, set a different measurement range on the device - 200 Ohms.

A resistance of 2 ohms is considered normal (-). There should be no break between the extreme terminals.

Next, check the condition of the contacts on the coil itself and on the wires; they tend to oxidize over time, especially if your region of residence has a humid climate.
If the error remains in cylinder 3, but the coil and high-voltage wires are in good condition, we check the spark plug.
The easiest option is to remove the spark plug from the working cylinder and swap them.
If the error then transferred to another cylinder, then most likely the issue is in the spark plug.
If nothing has changed and the error remains, then check the injectors.

In this case, you also need a multimeter. Disconnect the wires from the injector, in our case from cylinder 3, and measure the resistance, it should be about 13 ohms.

Next, check the injector power supply circuit. Also, the injector may become clogged and not supply the required amount of fuel, which can cause misfires. Therefore, you will have to clean the injectors.

If after all the above checks the misfires have not disappeared, you need to check the valve clearances.

The valves should not be tightly clamped, as this will lead to their incomplete closing, and this, in turn, will lead to a decrease in compression and compression ratio in the cylinders and this will cause misfires. Also, if you press too hard, the valve may burn out.

Especially the condition of the valves should be paid to owners of cars with LPG, since the combustion temperature of gas there is slightly higher than gasoline and therefore the thermal clearances of the valves in this case should be slightly larger, i.e. not 0.2, but 0.25 mm. And where is 0.3, then 0.35 mm (for the above models).

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READ ON THE TOPIC: Other characteristic malfunctions of the VAZ 2110 and other cars in the series.

Supply system

If the Priora engine (16 valves) is tripping, the reasons may be trivial. When there is no flash in the cylinder, perhaps there is simply no fuel there. If it has a normal compression ratio, it is worth diagnosing the power system. You should pay maximum attention to the air filter and the pipe. It is necessary to make sure that the clamps are securely tightened, whether the purifier body itself is intact, and whether there is any air leakage from the outside. Also pay attention to the tubes. They must be tightly secured to the throttle assembly. Fuel leaks, cracks, and broken plastic may indicate that some parts are faulty.

How to reset an error on Grant

There are three ways to get rid of the “Check Engine” icon:

Fix the problem;

Reset using OBD2 adapter;

Reset without adapter manually.

We use OBD2 adapter

Do you have a high-quality diagnostic adapter and the necessary software on hand? Then resetting will not be difficult. What to do if there is no program or diagnostic scanner?

The easiest way out is to buy a scanner from China. Price – 200-300 rubles. The main condition: read reviews about compatibility. Whether he reads your car or not is a lottery.

Once you have the scanner, insert it into the OBD connector to the left of the glove compartment.

The connector is located in an easily accessible location to the left of the glove compartment lid.

Download Torque Lite program - free version, basic functions work;

We start the car so that power goes to the adapter and error data appears;

We turn on Bluetooth on the phone, add a new device (the adapter will be detected as OBDII);

Open the Torque program - at the top of the screen there will be messages like Waiting for connection, Checking the CAN protocol, Connected successfully;

Open the settings – Fault Codes – Show logged faults.

The saved codes will appear on the screen. There, using Clear logged faults, you can reset all errors and the “check” will go out. Not forever - until the problem appears again.

Open settings – Error codes – Show saved ones.

An option close to a scanner is installing an on-board computer . BC:

Determines the error;
Will show its code and decryption;
It will help you reset.

How to remove a check without an adapter

Everything is simpler here. When you don’t have OBD or a phone with software at hand, you just need to disconnect the terminal from the battery.

which terminal to remove . De-energize the car for 5-7 minutes and all errors should disappear.

Problem with the method : it works less and less often. Only the scanner is guaranteed to reset.

Oxygen sensor

The "check engine" warning sign indicates a malfunction of the engine. First of all, you should check the operation of the oxygen sensor. It relates to the exhaust gas production system, so it shows the amount of oxygen that has not been burned in the combustion chamber of the engine. The device provides control of gasoline consumption on a Lada Priora car.

If the sensor is broken, the vehicle's computer control system does not receive the necessary data, which can cause fuel consumption to increase and engine power to decrease. There are up to 4 oxygen sensors depending on the car model. At home, you can use a computer error scanner, or you can contact a service center.

Why does the oxygen sensor break down? The older the car gets, the larger the layer of used engine oil on the parts, which reduces the correct operation of the sensors. If you do not change and check the condition of the oxygen sensors in the Lada Priora, the catalyst will break, which may burst and lead to serious repairs. New catalysts are expensive due to the presence of valuable metals in them, so it is better to focus on preventing the problem. If the check engine light comes on, you need to look into the sensors and determine the reasons.

When the seal is broken

When the check engine light comes on, you need to check the tightness of the fuel system; this is the reason why the light may be on. Don’t immediately suspect serious damage; start with small but important details. If there is a leak in the fuel system, air escapes somewhere in the fuel tank filler cap. This increases the overall fuel consumption, a malfunction occurs, so the system reports an error.

Check the engine operation of the Priora by ear. If the “check engine light” is on, the car is still running at normal power, there are no extraneous sounds from the running engine, no knocks, hums or squeaks, then the problem is the tightness of the fuel tank. From a technical point of view, it may be that the lid is not tightened enough or there is a crack in it. Correct what you can do with your own hands and see if the light on the Priora continues to light. Perhaps the problem will be solved after tightening the cover or replacing it.

Another problem that leads to a burning “check” is the exhaust gas catalyst on the Lada Priora. It serves to clean exhaust gases. Without a properly functioning part of this type, not only the driver suffers, but also the environment, as the composition of the exhaust gases deteriorates. The catalyst converts carbon monoxide and has an important function. This is also dangerous for the driver, and it is undesirable to drive with a malfunction of this kind. If the problem is in the catalyst, then the power will decrease by 2 times. In this case, a warning message will light up on the dashboard. Press the gas pedal and analyze the dynamics of acceleration.

If you take care of your car and perform regular maintenance, there should be no problems with your exhaust catalyst. It should be understood that one small problem on Priora can lead to other, more serious consequences.

If the catalyst breaks down, it is better not to use the car, since the serviceability of the engine is in question. Increasing fuel consumption will not lead to anything good; problems with engine traction will begin. Replacing your exhaust catalytic converter is an expensive service, but it shouldn't be ignored. There is an alternative for this part: a flame arrester, but this cannot be considered an absolutely correct solution.

Replacing the catalyst yourself is an extremely difficult task, so it is better to contact a specialized Lada Priora service center.

Gasoline consumption increases

The job of the mass air flow sensor is to determine the amount of air needed to be added to the gasoline mixture so that the fuel ignites optimally. The reasons why the notification lights up may be related to electronics. If a breakdown occurs in the sensor, a signal is immediately sent to the system and the light comes on. At the same time, gasoline consumption increases, the quality of exhaust gases decreases, and engine power decreases. The car does not move smoothly, but with jerks. A Lada Priora with a faulty mass air flow sensor will have difficulty accelerating and will have difficulty starting in the cold season.

Most of the breakdowns occur due to incorrect installation of air filters during scheduled replacements. If you do not change the air filters in a timely manner, according to the maintenance rules, the mass air flow sensor can cause serious problems.

If the light indicating a malfunction is on, you should not drive like this for a long time.

An experienced driver will be able to recognize when fuel consumption is increasing. Contact the service center. Replacing the sensor is not an expensive service, it will be done quickly. The necessary part for a Lada Priora is not that expensive, and you can change it yourself if you wish.

How to check engine errors and erase the error in the ECU memory

To carry out engine diagnostics and read error codes, as well as to reset them, many drivers prefer to go to a service station where there is a scanner. Service station specialists, at the owner’s request, can issue a printout that will display the error codes recorded in the control unit’s memory. Note that this procedure is optimal in the case when the check is constantly on. If the error is “floating” (the check periodically lights up and goes out), then a visit to the service may not yield anything.

In such a situation, you can buy a scanner for personal use, but its cost and the need to study the features of the software make this method impractical, especially when it comes to diagnosing only one car. Let us add that the scanner is used in parallel with a laptop or personal computer, which creates additional inconvenience.

All kinds of third-party BCs (on-board computers) also rightly belong to similar ones in terms of ease of use, cost and feasibility of purchase. The solution is capable of reading and deciphering error codes and displaying additional information about the parameters and operating modes of the internal combustion engine. At the same time, the BCs require proper connection and separate installation in the cabin.

Among the main advantages of such adapters is that the device is a small, compact “box” that is inserted into the diagnostic socket of your car. This means that the need to connect, lay wires, place the device itself in the cabin, use a PC and perform other additional actions is completely absent.

The adapter in the connector remains almost invisible and connects to a tablet or smartphone “over the air” thanks to bluetooth/wi-fi technology. This is especially convenient when the engine error lights up periodically. In other words, you can drive with the adapter in the connector as long as you like, and at the moment the check light comes on, immediately read the fault code. You only need to secure your smartphone or tablet to a stand or holder to be able to monitor the readings on the screen while driving.

As for the software, it may be supplied with the adapter. The necessary programs are also available in the Play Market for Android and similar solutions for devices on other operating systems. The software must be installed on a smartphone/tablet. Note that among the various available solutions, the Torque program is very popular (a free version of this application is available in the Market for Android). The program allows you to flexibly customize the interface, has the ability to not only read, but also decipher errors, and has the ability to reset engine errors.

What is the danger of this defect?

Having discovered that the engine begins to stall, this defect must be eliminated as quickly as possible, despite the fact that signs of malfunction may disappear after re-gassing. The fact is that such a malfunction can reduce engine power, which will lead to an emergency on the road. After all, every car owner relies on the power of his engine, especially when overtaking, and since the power of the power unit will be reduced, the car simply will not have enough dynamics to complete overtaking, especially in severe frost and ice on the road. Only timely car repairs and finding out the cause of the breakdown will help to avoid a deplorable situation.

Every car owner can do this in his own garage with the simplest tools, if the work is done in stages.

What is the danger when the engine stalls?

The first obstacles, now you understand, begin when you try to start the car. The Priora cannot be accelerated at all with the engine running like this, because in due course of acceleration the vibrations become even stronger. There is no need to experiment with overtaking on the road if you are driving the car when the engine is shaking - at that time the engine power decreases sharply, which means that there is a possibility of a lack of dynamics to successfully complete the maneuver.

The Priora has been in production since 2007, which is why in some cars the engine rattles as if it were already a quarter of a century old. This is how a 3-cylinder engine works. Even if the latest firmware is installed, a faulty engine will cause the check to glow. This is fraught with a reduction in the service life of the car.

Possible reasons

Why the check light on the Priora is on, but the engine is running normally - we will try to find out further. To find the reason for the blinking indicator, it is advisable to contact a service station, where specialists will carry out diagnostics and find out the code and specifics of the problem. In different situations, the indicator may light up due to minor defects in a particular car system.

The main factors for the check to catch fire can be the following options:

If the sensor lights up only while the Priora is driving, you should pay attention to the oil level. If this indicator is normal, it is advisable to change the oil after first checking the engine for defects and damage (if possible in a specialized center);
The reason for the blinking of the indicator may be low-quality fuel that floods the spark plugs;
If the engine runs normally but the check light is on, the problem may be the fuel filter or fuel pump. By replacing the appropriate filter elements, you can get rid of the problem;
If there is no spark from the ignition coil, the check engine may also be activated;
Faulty high voltage wires can activate the light bulb. They need to be checked and replaced if necessary.

Triggering of the check lamp after washing the car

Sooner or later, every car owner has to wash the power unit. This may be due to leakage of oil or other operating fluids, settling of dust and dirt on a wet engine, or it may be required after repair work.

If you carelessly pre-protect the components from moisture or overdo it with a high-pressure washer, then after turning on the engine will stutter and stall, and the “Check engine” signal will turn on on the dashboard.

These problems are most likely associated with a malfunction of the car's electrical system: unreliable contacts of high-voltage wires, ignition coils and other electronic units. There are known cases when water pressure knocked loose plugs from the connectors of control sensors.

The malfunction should be resolved by checking and thoroughly drying all connectors in the engine compartment. For additional reliability, moisture-displacing grease for electrical contacts can be used in suspicious areas.

In conclusion, it is worth noting that the “Check engine” signal always means that there is some kind of problem. If the check light is on, but the engine is running normally, the driver still needs to determine the reason for the warning light turning on and eliminate it as soon as possible.

The most common reasons when the Check Anger light comes on on a Priora

Mass air flow (MEF) sensor.

Throttle position.
Camshaft position.
Crankshaft position.
Knock sensor.
Oxygen sensor (2 pcs.).
Oxygen sensor (2 pcs.).
Rough road sensor.
The actuators may also include a warning light.

Idle air control (IAC).

Fuel injectors (4 pcs.).
Ignition modules (4 pcs.).
Ice chamber valve.
Electric fuel pump.
All these units are activated through the computer, so if there is a malfunction in their operation, the “Check” indicator immediately lights up.

The first thing, of course, will be the failure of the oxygen sensor. These devices are installed in the exhaust manifold (sensor No. 1) and after the fuel afterburner (catalyst) No. 2. They read the percentage of CO in the exhaust gases. Most often they are damaged due to impurities from burned fuel. The car begins to lose power and the “Check” warning light comes on. Eventually the computer receives a signal that there is too much fuel.

The most common ECU errors that cause the “Check” to light up

Unfortunately, the exact cause of the signal fire can only be determined using software diagnostics.

The second, deservedly, is the mass air flow sensor. A fine thread made of a special alloy changes resistance depending on the amount of air passing through the nozzle. The defect is characterized by severe disruption of engine operation. The revolutions will “float”, the power will drop and, of course, the “Check” will light up. And also check only with diagnostics according to the program.

The camshaft sensor is located on the lower three. Its malfunction is characterized by an increase in startup time. Sometimes there may be slight jerks during acceleration. When determining a malfunction, no program is required.

Here, first of all, there is a damper, i.e. a device that regulates the supply of additional air bypassing the damper. It works with the help of a micromotor that extends and retracts the flap mechanism. If it fails, the engine does not start and idles. Or vice versa, exceeding 1500-2000 rpm. The indicator light will light up.

Priora actuators

Then the ignition modules. In case of failure, the engine “throws” and “floats” at speed. Loss of power. Consequently, the “Check Engage” icon lights up.

Faulty injectors give similar signals. Interestingly, all actuator malfunctions can also be diagnosed without a computer if you have certain skills. They will make the Check glow though. This is done either by replacing it with a known good one, as in the case of a check valve, or by swapping it in places, as in the case of ignition modules or injectors. Only the canister valve requires fittings.

So what can we say. There is only one conclusion. If the “Check” warning light on the instrument panel lights up, in any case it is necessary to carry out computer diagnostics. This is the surest way out.

If the check light comes on when starting on a cold engine

If, when you turn on the ignition, there is no characteristic sound of fuel pumping, and the engine icon lights up on the panel, then most likely the relay supplying power to the fuel pump is faulty.

The exact location of this device depends on the specific vehicle model and may be in the immediate vicinity of the fuel injection control unit or near the fuse box. The reasons why the relay does not operate can be either a malfunction of the device itself or a failure of the fuse protecting it.

A faulty fuel pump relay must be replaced with a new one, and if the fuse blows, it is imperative to determine and eliminate the cause of this problem, since possible short circuits in the electrical wiring can lead to a car fire.

If there are problems with starting, a cold engine runs unstably, then the fuel injectors are probably clogged or their electrical wiring is faulty. To fix the problem, you need to flush the injection device and eliminate damage to the electrical control circuits.

The reason that the check signal lights up after starting the engine may be a malfunction of the device for absorbing gasoline vapors - the adsorber.

This happens if the absorbing element (activated carbon) becomes unusable or the solenoid control valve fails.

Many car owners remove the used adsorber due to the high cost of a new part. In this case, it is imperative to rewrite the firmware of the control unit in order to avoid the constant occurrence of errors in the system.

Often the warning indicator lights up without any problems with the motor due to simple inattention. A fuel tank filler cap that is poorly tightened in a hurry reduces the pressure in the gas lines by allowing air to pass through. This leads to increased gasoline consumption, which the ECU evaluates as a malfunction and then the check lamp turns on on the panel.

Another reason could be a faulty air flow sensor. To ensure the optimal composition of the fuel mixture, the control unit controls air consumption using readings from the mass air flow sensor (MAF). If the air filter is not regularly replaced, the working element of the air flow control valve becomes clogged with dust particles, which leads to distortion of its readings.

In such a situation, the ECU switches to calculating the air consumed by the engine using indirect methods and warns the driver of a malfunction through the “Check” switched on. Also, if the mass air flow sensor fails, the engine does not start well at subzero ambient temperatures.

Replacing an air flow sensor is quite simple, but the cost of the part itself, depending on the make and model of the car, can reach 10 - 15 thousand rubles. Therefore, it is better not to skimp on routine maintenance of the machine and promptly purchase and install a high-quality air purification filter.

We recommend: Why doesn't the engine pull? Reasons for power loss

The occurrence of detonations during the combustion of gasoline in the cylinders is monitored using a knock sensor. If there is no information or a low signal level from the sensor, the ECU sends an error message to the dashboard.

Structurally, the sensor consists of a piezoelectric element and a resistor, so it cannot be repaired and can be replaced as an assembly.

The idle speed controller (IAC) is responsible for setting and maintaining the required speed in different engine operating modes. The regulator specially opens and closes the hole in the throttle body pipe for air dosing. As a result, the car can start moving immediately after starting the engine without a long warm-up.

Unstable operation of the engine at idle and an illuminated engine malfunction signal indicate a breakdown of the IAC and the need to replace it.

How to remove check engine

Let's take a closer look at the steps that need to be taken first of all in order to get rid of the Check Engine indicator that lights up. The priority action algorithm will be as follows:

Check if the gas tank cap is closed . The situation is especially relevant if you have just left the gas station, and soon after that the check engine icon comes on. This means that either the tightness of the fuel system has been broken due to the tank cap not being screwed tightly enough, or the quality of the fuel leaves much to be desired.
Check the condition of the spark plugs . To do this, unscrew them and visually assess their condition. Very often, it is the spark plugs that cause the Check Engine light to come on. In particular, the reason may be that they begin to pass current due to carbon deposits on the electrodes. This coating is formed as a result of the high content of metals or other conductive substances in the fuel. An error may also occur if the gap between the electrodes on the spark plug exceeds a distance of 1.3 mm. We will consider the diagnosis of candles in more detail and how to perform it based on their color separately. You will also find information about replacing them useful.
Oil level. If the check engine light only lights up when the engine warms up, stop and listen, you may hear extraneous sounds from the engine. Check the engine oil level with a screw and add it if necessary. Also check for oil leaks.
If your car is equipped with sensors for the purity of process fluids (motor oil, fuel, etc.), then the indicator may light up if the corresponding indicators exceed the permissible limit . The solution is to replace the appropriate filters or completely liquids if they do not meet the standards.
Resetting the negative terminal from the battery ( 15.20 seconds ). After this, the Check Engine light should go out and the clock on the computer should reset to zero. This method may be relevant in two cases. The first is a banal “glitch” of the ECU. The second is if a large number of small errors have accumulated in the memory of the electronic unit and have not been reset. (usually they are caused by the use of low-quality gasoline, the presence of harmful impurities in the fuel-air mixture, moisture on electrical contacts, etc.).

If, after performing the above steps, the Check Engine indicator does not go out, or goes out, but soon lights up again, this means that the error lies deeper, and in order to eliminate it, additional detailed diagnostics must be carried out using more serious means.

Diagnostics of spark plugs by plaque

When the engine starts cold or hot, you can check the carbon deposits on the spark plugs. If the coating is white, then this indicates a lean mixture and overheating of the engine. A black tint indicates a rich mixture. In both the first and second cases there are problems with the operation of the electronics. This is either installing new firmware, or replacing the ECU. A normal candle has a brick color. By the way, the engine may stall at idle if the part is damp. This also significantly increases the warm-up time. In addition to the spark plugs, the ignition coil may also be acting up. Priora (8 valves) is equipped with distributor ignition. Overheating of the coil is often observed. You can restore the operation of the motor by simply replacing the element.

How to diagnose the ECM

As I already said, when errors like check engine appear, the Priora car owner has two options: solve it yourself or you can contact a car repair shop. The car owner can use a portable mobile device to read the fault codes from the electronic control unit that contributed to the appearance of the check on the Priora vehicle.

It is necessary to correctly understand the cause of Check Engine on Priora and decipher it. Some error numbers can be found in the operating book for the “heart” of the vehicle. The rest can be found on the Internet.

For example, if the check engine light is on, this means that the following causes of engine malfunction have arisen:

broken track sensor;
adsorber is faulty;
The mass air flow detection device does not work.

Fault codes will tell you that one of the systems or components has failed and needs to be replaced.