Why does the check light on the Priora light up, but the engine runs fine? explanation 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

Check engine error on Priora

The reasons why the check light on the Priora came on could be:

• incorrect composition of the combustible mixture;
• problems with spark plugs;
• problems with engine speed readings and much more.

Don’t be afraid of the error light shining when you start the engine - this is normal in a Priora! But if the check does not go out for some time with the engine running, you should think about a possible problem.

First of all, the problem may relate to problems with the engine. Check engine literally means “check the engine.”

Let's look at the most common problems that a check may indicate:

1. The error only appears when the vehicle is moving. In this case, it is recommended to check the engine oil level; it may be very low. If the oil level is insufficient, it should be replaced as it may lose its lubricating properties. In addition, it is worth inspecting the power unit for damage and defects. It is advisable to entrust the inspection of the engine to a qualified technician at a car repair shop.
2. The Check engine light is flashing. Listen to the engine, maybe it's running rough? This fact sometimes causes spark plugs to misfire. Pay attention to the gas station where you last refueled your car. The reason may lie in low-quality fuel.
3. Problems with the fuel pump or untimely replacement of the fuel filter also causes the engine error light to come on. In this case, replace the fuel filter and fuel pump.
4. The fuel system is leaking. In this case, you should check the fuel filler cap. Replace the sealing gasket or simply tighten the cover.
5. Quite often, the reason for the check to light up may be the lack of a spark from the ignition coil. We also include problems with the operation of the catalyst to this point.
6. Another reason is the failure of high-voltage wires. The elimination method is to check their functionality and, if necessary, replace them with new ones.

Note that the Check engine system is connected to the operation of most systems in your car. The occurrence of a malfunction indicates the requirement for immediate diagnostics of the machine in a specialized center. Timely technical inspection of the vehicle will help preserve your finances. After all, only specialists can correctly understand the malfunction and eliminate it.

It is not recommended to “reset” the check yourself, because truly serviceable systems in your car are the key to trouble-free driving and safety on the road.

the Lada Priora engine troit?

8 and 16 valves and what to do

Lada Priora

- a favorite among Russian cars, sales of modern vehicles are breaking records. Among the advantages of the Priora, owners note a good engine, which, in comparison with other Lada models, has the best dynamics; the interior is also very comfortable. But it doesn’t happen without effort, for example, an engine designed for 8 or 16 valves often fails.

A malfunction results in the motor quickly overheating, working as hard as it can, and then burning out a little later. Newbies are interested in what it means to “trouble” the engine? Experts explain that when you start the engine, it runs intermittently, and dull sounds are clearly audible from the exhaust pipe. Unburnt fuel emits a strong, stuffy odor, vibrations increase over time, and cracks form in the cushions.

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.

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.

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.

Similar article: Is it possible to add another brand of oil to the engine?

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.

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

Engine damaged

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

1. 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.
2. 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.
3. The winding of the injector parts burned out.
4. Low quality fuel.
5. Test the spark plugs.

System malfunctions

If it was not possible to detect a malfunction in the electronic part, then it is necessary to move on to analyzing the mechanics. Thus, the occurrence of the tripling effect is influenced by one of three systems - air, fuel and spark. Typically, engine tripping is caused by a lack of spark, but other systems can also affect the course of events. Therefore, it is worth checking each system separately.

Sparking

In this case, we are talking about failure of spark plugs or high-voltage wires. Checking these elements is quite simple. First you need to remove the wires from the car. To do this, you need to pull out the tip of the wire from the spark plug, and the second from the ignition coil. Then, using a spark plug wrench, unscrew the spark plugs from the block head.

Diagnosis of spark plugs is quite simple. First, you should inspect the part for cracks or damage. Clean the contacts with a cloth if they are dirty and install the spark plug back.

The high-voltage wire is checked using a resistance tester. First, each product is checked for insulation breakdown.

Fuel supply

Three parts play a role in the quality process of fuel supply: pump, filter and nozzles. To begin with, it is worth diagnosing the latter. To do this, they are dismantled from the car and installed in a special stand, which will show how suitable the parts are for further use. After this, it is worth carrying out the cleaning procedure.

The next thing to check is the fuel pump. It is located in the fuel tank, and can only be reached from the passenger compartment by first removing the rear sofa. After this, the power and fuel lines are turned off. Then, you need to take the fuel pump out and inspect the filter mesh. If it is dirty and clogged, then it should be replaced.

In the case of the fuel filter element, everything is simple - change it. This part is not dismountable and it is not possible to accurately determine its condition.

Air supply

Another system without which ignition of the air-fuel mixture is impossible. To begin with, it is worth dismantling the air filter element (air filter) and inspecting its condition. If it is too dirty, it should be replaced.

What to do when the Lada Priora engine troits

Lada Priora engine repair

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

1. 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.
2. 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.
3. 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.
4. 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.

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.

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 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.

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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.

Tips and reviews from motorists

Judging by the reviews of Priora owners, we can conclude that the following factors may be the reasons for the activation of the engine control warning light:

• In severe frosts, when starting the engine, only three cylinders may turn on, therefore, the check light comes on. After restarting the engine in normal mode, the light may continue to blink for several days. As experts explain, when jamming, a carbon particle can get on the contact and freeze. The spark disappears until the spark plug is cleaned;
• High humidity can also cause the sensor to activate unexpectedly. Usually, after drying the car, the flashing goes away;
• Electronics failure;
• Low quality gasoline. One of the most common reasons is when, due to carbon deposits, the engine starts to stall, and the checkbox reacts to this by lighting up;
• Fuel tank cap is not tightly closed;
• Untimely replacement of spark plugs.