Because of what the VAZ 2112 does not start.

If somewhere along the way your VAZ 2112 car stalled, starts up for a short time, and then turns off again, then it is unlikely that it will be possible to eliminate the malfunction in the field. Although there are no rules without exceptions, it happens that the tank has run out of fuel, and the sensor is lying. But oddly enough, it is much easier to detect a breakdown in a car when it shows no signs of life. Whether it will be possible to revive it on the road is a difficult question, but it is worth trying. There are several guidelines.

What could have broken?

If the machine does not work, then the motor is broken. This is often heard from an inexperienced driver. But in a car, in addition to the engine, there are many more different elements, on the serviceability of which the operation of the power unit depends. If the car is not completely "dead" and when the starter rotates shows signs of life, "sneezes" or "shoots" into the exhaust pipe, the malfunction will be more difficult to find.

The malfunction that caused the engine to shut down is hidden in one of the three VAZ 2112 systems:

electrical equipment and power supply;
fuel supply system;
gas distribution mechanism and piston group.

It must be understood that with a low level of coolant or oil in the crankcase, the engine will not stall, it may fail from overheating or lack of lubrication. Therefore, it is important to remember the circumstances preceding the engine failure. It's one thing when the power unit just stopped on the move, it's another thing if you heard extraneous knocks or shots in the exhaust before that. In the first case, the electrical part is probably to blame.

A sign of the second situation is often a torn timing belt, which is easy to find by removing its upper plastic casing. The belt can be changed on the way if you have a spare, otherwise you will have to look for a part or a towing vehicle. If the starter cannot turn the engine crankshaft when trying to start, then there can be two reasons:

there was a breakdown in the generator circuit, and the battery served as the voltage source, which was discharged as a result;
from a lack of lubrication, the crankshaft is seized.

In both situations, you need to look for a way to deliver the car for repair; you cannot do anything on the road.

Malfunctions of electrical equipment

There are several reasons why an engine can stall:

malfunction of the ignition switch;
the fuse in the fuel pump circuit has blown;
no voltage is applied to the spark plugs;
one of the sensors has failed, on which the operation of the power unit depends.

First of all, it is recommended to check the operation of the fuel pump, when the ignition is on, it emits a quiet hum (comes from the back of the car). When there is no such sound, it is necessary to open the VAZ 2112 fuse box and check the condition of the fusible link No. 3, which closes the fuel supply relay circuit. The blown fuse should be replaced with a new or temporary "bug" made of copper wire and try to start the motor. If the car starts up, feel free to continue your journey.

Without knowledge of the electrical part of the car, the breakdown of the ignition lock cannot be bypassed, and it is not easy to diagnose it. Therefore, it is recommended to check for a spark on the spark plugs, for which it is necessary to unscrew one of them and securely attach it to the metal part of the engine by connecting a high-voltage wire. Then turn on the starter and watch for sparking. If there is a spark, good, you have to look in a different direction. In its absence, breakdowns may be as follows:

the simplest is the failure of high-voltage wires or spark plugs;
malfunction of the ignition switch or the corresponding relay;
the switch or the ignition distributor slider has become unusable (on carburetor machines);
the crankshaft position sensor is out of order (on vehicles with an injector).

If high-voltage wires or candles can be replaced, then the breakdown of the remaining elements must first be accurately diagnosed, which is hardly possible in the middle of the field. In addition, the throttle position or air flow sensor may break, causing the controller to switch the injector to emergency operation. Then the car can often stall at idle speed.

Fuel supply problems

The reason that the engine stalls at idle speed can be not only the fuel pump, but also the fuel filter that has not been changed for a long time.

If the element is completely clogged, then the amount of fuel passing through it is simply not enough for the normal operation of the power unit.

In the carburetor VAZ 2112 models, the cause of a lack of fuel can be the wear of the mechanical drive of the fuel pump or its diaphragms. It's easy to check: disconnect the fuel supply hose from the carburetor and direct it into a plastic bottle, then turn on the starter. The jet of gasoline from the hose should be powerful and confident, when gasoline flows weakly, try temporarily removing the gasket under the fuel pump landing flange.

The absence of fuel in the carburetor is checked by removing the air filter cover and pressing on the accelerator rod. A jet of fuel should spray out from the nozzle of the atomizer that goes into the primary chamber of the carburetor. When it is not there, it is necessary to clean the strainer installed at the inlet to the unit, or check the operation of the needle valve.

As for the injector, it is unrealistic to find faults with the fuel supply on the road there. Even if you manage to get to the nozzles and unscrew them, you will not be able to check. In order for the injector to supply fuel, a signal from the controller must be sent to it. Only an experienced electrician can artificially create such a signal, so it makes no sense to disassemble the injector on the way. It will be difficult to find the reason for the absence of a spark, which may be hidden in the ignition module or in the coil. You can find out more precisely only in a car service.

Quite often, the owners of domestic cars are interested in the question of why the starter turns, but the VAZ 2110, 2112, 2114 will not start. Such an unpleasant moment can come at the most inopportune moment, at any time of the year, far from service centers or repair shops. It is desirable for each driver of these models to get acquainted with the list of possible malfunctions. This will allow in some cases to independently find the problem that has arisen, and then eliminate it and continue to operate the machine.

The starter turns, but the VAZ 2110, 2112, 2114 and 2115 will not start? this happens most often in the cold season, and if there is no proper care and maintenance of the car, then this can happen at any time. In this article, we will try to consider in detail all possible problems with starting the engine at any time of the year. Such problems can occur with both carburetor models and injection power units.

Why the engine won't start

Difficulties with starting or its inability can arise for a variety of reasons. The culprits should be looked for in such devices:

Fuel system malfunctions for all types of engines;
Problems in the electrical equipment of the machine.

It should be borne in mind that starting the motor in cold weather differs significantly from carrying out this operation at positive temperatures. We will not touch upon the problems with the battery and the starter, we will assume that everything is in order with them, so we will dwell only on the problems of the power unit.

Fuel system, what's wrong with it?

The principle of fuel supply in carburetor and injection models of engines is different, but intermittent malfunctions are in many ways similar. Fuel supply in both systems is carried out by a gas pump. In the carburetor model, it has a mechanical drive, in the injection models it is an electric pump that creates high pressure in the fuel rail. Both types of pumps have built-in fuel filters, which clogged up will cause failure when attempting to start the engine.

An electrically driven gasoline pump may not work due to the lack of supply voltage at its terminals. A blown fuse or broken wires may be the culprit in this situation. Problems can arise due to the fault of the carburetor, clogged nozzles will not allow the engine to start. But most of the problems in the fuel system are inherent in injectors.

In such systems, there are several sensors that monitor and regulate the operation of the power unit. Failure of the DPKV will make it impossible to start the motor. Such problems can occur due to the fault of the pressure regulator in the fuel system. It is impossible to exclude from the organizers of the bad start of the engine injector.

And what can be with electrical equipment?

If there is something to burn in the working cylinders, then you need to look for what will make the mixture burn. This means that you need to pay attention to the car ignition system. It can be an ignition distributor, a high-voltage coil and wires, candles. It does not happen that all devices fail at the same time, so they should be discussed separately.

We will assume that the distributor is installed correctly, in which case a failure can occur through a breakdown of the cover or slider, failure of the Hall sensor. However, most often the reason is poor contact in the power connector of the ignition distributor. Problems can be caused by an ignition module or coils that do not generate high voltage to form a spark on the spark plugs.

Injectors work in conjunction with ignition modules, of which there are usually two per engine. One provides the operation of 1 and 4 cylinders, and the second 2 and 3 cylinders. In these systems, the electronic control unit can be problematic, which generates control pulses for all systems, including ignition. You can check this block only by replacing it. The same can be done with the ignition modules.

Sometimes a malfunction can occur, it does not generate a voltage that can form a spark to ignite the air-fuel mixture. You can check its operation if you unscrew the plug from the cylinder and together

A car malfunction is a nuisance for the owner, especially if the car suddenly, for some unknown reason, stopped starting. If the VAZ 2112 does not start, the problem may lie in different parts of the car. Many breakdowns can be easily eliminated with our own hands, therefore, before contacting the workshop, we try to independently find and eliminate the cause of the engine's failure to start. Most often, the engine does not start due to the failure of one of the elements responsible for starting, ignition or power supply.

Checking the launch system

A breakdown in the starting system is mainly associated with an inoperative starter. If, when the ignition is turned on, the sound of the starter operation is not audible, first of all we check the connecting contacts for integrity. After that, we make sure that there was no open or short circuit in the circuit responsible for turning on the starter. A malfunction of this part can be caused by a failure of the traction relay. If, when the starter is on, a sound is heard in the form of repeated clicks, the malfunction is caused by a burned-out winding of the traction relay, an insufficiently charged battery, weak contacts in the starter connection circuit. If the starter works, but does not turn or does not rotate fast enough, the VAZ 2112 will not start due to a dead battery, burnt contacts on the tag relay, worn out starter brushes, a dirty collector, a short in the windings or broken contacts.

If the starter turns, but the flywheel remains in its original position, it is recommended to check if the retaining contact of the clutch housing to the starter is not damaged. In this case, the cause of the breakdown may be the wear of the flywheel teeth or drive gears. If the starter does not start working after starting the engine, we check the freewheel and the contacts of the traction relay. If one of the listed faults is found, it is important to stop the engine immediately.

Diagnostics of the ignition system

If the VAZ 2112 does not start, and everything is in order with the starter, proceed to the diagnosis of the ignition system. We set the car to neutral gear and the parking brake. Turning on the ignition, check for damage or loose contacts on the high-voltage wires leading to the spark plugs and the ignition module. After that, we inspect the connections and the integrity of the low-voltage wires of the ignition system. If the wiring is in good condition, make sure that there is a spark on the candles. If there is no spark, new high voltage wires will have to be installed. To make sure that the reason for the failure of the VAZ 2112 engine to work is this problem, you can take the wires from the working car and check if there will be a spark. If there is no spark, replace the ignition module. If there is a spark, we replace the candles. The cause of an ignition malfunction may lie in a breakdown of the engine control system.

Checking the power system on the VAZ 2112

Having excluded the above breakdowns, we proceed to check the power system on the VAZ 2112. If the VAZ 2112 does not start, you need to make sure that the fuel pressure in the fuel rail is at the required level. It so happens that the car engine does not start due to a dirty air filter, broken electrical contacts leading to the fuel injection system pads. The fuel pump or the fuel pressure regulator could be out of order. If, after turning on the ignition, the sound from the operation of the gas pump is not heard, then the reason for the engine failure to start is the failure of this part. After checking all the systems, but not finding the cause of the breakdown, it is recommended to contact the service center for further diagnostics.

The starter device is considered one of the main mechanisms of the ignition system in any car, and domestically produced cars are no exception. If this unit breaks down, the driver simply will not be able to start the engine, respectively, full operation of the car will be impossible. For what reasons it is not in the VAZ 2112 and how to change this device if necessary - we will talk about this below.

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Possible starter malfunctions: causes and symptoms

The main components of the mechanism

So, first, let's analyze the malfunctions for which the starter does not turn on the VAZ 2112.

If the engine does not start, it does not mean that the problem lies in this particular device, so first you need to make sure that the problem is not in a discharged battery:

If, when trying to start 2111 from the key, the crankshaft turns once or there are frequent clicks of the device, this is just the same indication that the battery is discharged. Also, the reason may be poor contact of the terminals with the battery or disconnection or poor contact of the mass of the mechanism.
If you hear only one click when starting the engine from the key, and, accordingly, the engine does not start, most likely the problem lies in the burnt power contacts. In particular, we are talking about the solenoid relay of the mechanism. Due to burning, these contacts will not be able to conduct voltage across them. It also happens that the engine is started from the key on the VAZ 2112, the starter does not turn, but the contacts are intact, if this is the case, then the reason should be sought in the idle electric motor of the mechanism or its drive.
The appearance of abnormal noise during the operation of the device may be due to wear of the bushings of the bearing devices. In addition, the reason may lie in the wear of the journals on the armature shaft.
It is necessary to check the quality of fastening of the device. It is possible that the problems in its performance are due to the weakening of the screw fasteners. It should be borne in mind that vibrations can negatively affect the functionality of the mechanism.
Also, the reason may be damage to the teeth of the drive (the author of the video is the Lexin channel).

Final diagnostics of the starter before replacing

If the starter on the VAZ 2112 does not allow the engine to start, before proceeding with the repair, a complete diagnosis of the device should be carried out. First, you will need to open the hood and dismantle the air filter element, for this you need to unscrew the bolt on the body and loosen the clamp on the hose with a screwdriver.

The VAZ 2112 starter itself is located directly under the air filter housing, the diagnostic procedure is carried out as follows:

First, you need to check how well the wires connected to the mechanism are connected. There is a chance that the problem lies precisely in the electrical circuit.
If the wiring is intact, turn on the optics. When the battery is discharged, the light of the flashlights will be rather weak.
Disassemble the wires from the ignition switch connectors, then connect them to each other (wires 30 and 50 in accordance with the auto diagram). When the contacts are closed for a short time, the mechanism will start twisting, if so, then the reason lies in the ignition switch.
When the lock is working, an additional wire is connected with a connector and a relay, as well as with a positive battery terminal. In the event that the starter unit is triggered, this may indicate a malfunction in the circuit from the battery to the relay.
If these actions did not help to identify the malfunction, then you will have to dismantle the unit and check it in more detail (the author of the video is HF Autoelectrician).

DIY repair and replacement of the mechanism

If the power unit does not start, it is necessary to repair the VAZ starter.

This procedure looks like this:

First of all, disconnect the battery, and then disconnect the wire connected to the traction relay.
Using a 13 wrench, you will need to unscrew the nut that secures the positive contact of the cable connected from the battery to the starter unit. The wire itself can then be dismantled.
Next, you will need to unscrew the nuts with which the mechanism is attached to the clutch housing. To unscrew the nuts, you need a 15 wrench.
After completing these steps, the starter unit can be removed. If you plan to replace it with a new one, then the replacement can be performed at this stage. When replacing, the location of the wires must be taken into account; in no case should they be confused. Therefore, before disconnecting the wires, it is advisable to mark them. If you do not want to change the mechanism, but plan to repair it, then you can start disassembling it.
For disassembly, you need a 10 wrench, with it you can unscrew the nut located on the relay and dismantle the wire connected to the starter.
The screws of the relay, which fix it to the starter unit, must be unscrewed with a key 8. Having done this, you can dismantle the relay.
After removing the relay, you can see a gasket that is located between the front cover of the mechanism and the relay itself. For disassembly, it should also be removed, but when dismantling it, you should pay attention to its condition. If you see that the sealing element is worn out and its quality is low enough, then it is better to replace this component.
When the seal is dismantled, it will be necessary to remove the spring, as well as the anchor.
The next step is to remove the parking stud nuts.
After completing these steps, you can dismantle the mechanism from the studs with the anchor itself. After that, it is necessary to thoroughly clean the internal parts and components of the device. For proper repair, you should diagnose the contacts, and also completely disassemble the brush assembly and check its condition. In general, the procedure for repairing the mechanism is quite complicated, so not every motorist chooses this method - sometimes it is easier to just replace the unit with a new one. In particular, this will be necessary in the event that the repair process has not yielded any results.

The inability to start the engine on a VAZ 2112 is a standard problem of this model (especially with a 16-valve engine). The best solution to identify the underlying problem is to use a diagnostic bench.

In the absence of such an opportunity, you can partially carry out a check with your own hands, on the spot.

Incorrect operation of electrical equipment

Most often, the cause of the malfunction lies in the improper operation of the electrical equipment. This is one of the most common problems associated with startup failure. The first thing to check is the operation of the electronic control unit. It looks like this:

Often water gets into contact groups, other nodes of the ignition system. This leads to oxidation of contacts, lack of voltage supply.

Problems can be associated with the fuel pump relay as well as the starter motor. Do not forget about checking contacts, various connections. Often the problem lies in the "mass" - there is simply no zero in the wiring.

Sometimes the reason for the inability to start lies in the alarm - its breakdown, incorrect settings often lead to the inability to start the engine. In the absence of the necessary tools, experience in the installation of "signaling" independently to cope with the problem will be difficult.

Fuel system malfunction

The principle of operation of the VAZ 2112 fuel system is not much different from similar vehicles with an injection injection system. Often the problem is purely mechanical - the grid of the fuel pump is clogged.

This leads to the impossibility of supplying fuel at the required pressure to the combustion chamber. The clogged mesh of the fuel pump looks like this:

An important factor in the operation of a car engine is precisely the general condition of the fuel system. If the car does not start or grasps poorly, it constantly stalls - the problem may lie in the improper operation of the injector ramp. The check is quite simple and you can do it yourself:

we open a special plug - it is black, located at one of the ends of the ramp;
the presence of pressure is determined simply - you just need to bring your hand to the hole.

It often happens that there is pressure in the rail. But the car continues to start badly. In this case, it is worth going to the next step - checking the operation of the fuel pump. Sometimes the carburetor is the problem. Cars of the VAZ 2112 model with such an injection system are difficult to find on sale. If starting is difficult on a cold one, then the problem lies, most likely, in the electrics.

Problems in the operation of the gas pump

Unlike other models produced by VAZ plants earlier, the fuel pump is located in model 2112 directly in the cabin behind the rear seat. First of all, you need to check if the pump is powered. This is very simple to do - just use a multimeter:

set the switch of the device to the constant voltage test mode, up to 20 V;
remove the special terminal from the pump;
using the probes, we check the power supply with the ignition on.

If power is present, but gasoline is still not supplied, then you just need to replace the part with a new one. The renovation does not make any economic sense.

The cost of a pump for a VAZ 2112 usually does not exceed 1.5 thousand rubles. If there is a spark, but the engine stalls on the move (including at idle), the problem may lie in low pressure.

Malfunction of the car ignition system

Often, the inability to start the vehicle's engine lies in the breakdown of the ignition system. The main nodes that will need to be checked:

accumulator battery;
egnition lock;
candles;
ignition coils;
crankshaft position sensor.

Often, the battery causes problems - especially if things are the case in winter. The battery can be damaged due to cold weather. Either the contacts have oxidized, there is a break in one of the power wires. All this can cause serious malfunctions. Checking the battery is relatively simple:

using a tester, the voltage at the contacts is measured - it must be at least 12.6 V;
a hydrometer is used - the density of the electrolyte is measured (and the normal value of this value depends on the ambient temperature).

Another weak point is the ignition lock. It is not uncommon for a contact group to leave while standing. It usually just burns out. As a result, the positive contacts supplying voltage to the starter simply stop working. In this case, you will need to make a replacement. There is only one way to check the operation of the ignition lock - to disassemble it.

Failure of spark plugs

The first thing to think about after checking the presence of power and the ignition switch is the integrity of the spark plugs. Since even if there is a spark, they may not work correctly. It's easy enough to check them:

the candle is unscrewed from its block using a special key;
one of the candlesticks is put on it;
then it is necessary to "turn" the starter.

The spark between the center and side electrodes must be blue. If it is red or completely absent, the candle must be replaced. This part is a consumable. According to the regulations, regardless of the recommendations of the manufacturer of the candles themselves, they must be replaced every 10 thousand km.

Checking the ignition coils

Often, the absence of a spark on one of the candles is associated not with its failure, but with other reasons. For example, the problem is with the ignition coil. It is relatively easy to check it:

it is necessary to remove the coil from its seat;
it is necessary to check the internal resistance - this can be done using a conventional tester - the value should be from 0.0 to 0.3 Ohm;
then the primary windings are called.

If there are no readings or if they do not correspond to the rated ones, the coil should be replaced with a new one. Details like these are not intended to be repaired.

Starter check

Starters installed on the VAZ 2112 are relatively reliable. But if, after all the above checks, it was not possible to identify the reason for the inability to start, then it should be removed for diagnosis.

It will be extremely difficult to disassemble and check all its components on your own. First of all, you need to check: is voltage coming to the power contacts of the starter? Often it is a cable break, a hallway, and contact oxidation that makes it impossible to start the motor.

Since there is no voltage on the starter winding. The vehicle diagnostics process can take a long time. Therefore, you should start with the obvious and most common faults.

It should be noted that if there are problems with starting a hot malfunction, it is difficult to determine. If you cannot cope with the repair yourself, then you should contact a qualified service.