One of the most important elements is the electric fuel pump, which is located in the car's fuel tank. The fuel pump pumped fuel to the system from, creating a certain pressure.
Car repair professionals allocate the following common problems of the fuel system that are associated with the fuel pump:
- basic pumps badly and does not create the right pressure;
- baszonasos does not pump when the ignition is turned on;
Taking into account the fact that the fuel pump is an electromechanical device, the most popular faults of the fuel pump are associated with both mechanical and electrical parts. Next, we will look at what signs indicate the breakdown of the fuel pump and why it ceases to swing the fuel pump partially or completely.
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Signs of focus of fuel pumps
The main symptoms of the failure of the fuel pump, as well as failures in its work are:
- the car starts with difficulty, the engine works unstable, there are failures, jerks when pressed on the gas pedal, etc.;
- the pump does not pump after turning on the ignition, and does not pump the fuel pump, the engine does not start;
There are also cases when the fuel pump ceases to swing right in motion. The engine in a similar situation begins to work with failures and stalls immediately after the remains of gasoline in the fuel line are spent. The problem may occur both regularly and periodically.
Not shakes fuel pump: causes and diagnostics
Let's start with the fact that if the benzobak is filled, charged, dry and there is a spark, the starter turns the engine normally, but it does not occur, then does not occur at the same time, then pay attention to the fuel pump. A frequent problem is that there is no power on the fuel pump after the ignition is turned on. A similar fault is also manifested in motion when the power supply to the fuel pump and the motor suddenly stalls.
No less important point is how much gas station shakes. In other words, the pump can buzz and buzz (food is served), but do not create the desired pressure in the fuel line. The pressure in the fuel system with the working fuel pump must be more than 3 bar (which depends on the specific car model). The specified pressure is accumulated in the fuel ramp and has an indicator from 300 kPa and higher.
To check, it is necessary to measure the pressure gauge pressure in the fuel rail, taking into account the indicators that are the norm for a particular car model. Using the example of injection vases, the pressure at the inclusion of ignition 3 of the atmosphere, at idle the index is 2.5 atmospheres, while pressing 2.5- 3 atmospheric gas. This method will help accurately determine:
- fault of the fuel pressure regulator in the ramp;
- breakdown of a gas station or a noticeable reduction in its performance due to wear;
- strong filter contamination (fuel filter and / or gas station mesh);
In the second case, when pressed for gas, the pressure does not grow, in the latter case, the pressure gauge arrow rises, but very slowly or jerks.
Reducing the pressure indicator below the norm will lead to the fact that the motor may not start or start hard, told, twitch, work unstable and with failures. If this happens through the wine of the pump, and not the fuel filter, then the likelihood that the mesh of coarse purification of the fuel pump was hampered. In this case, there is no need, as it will be enough to replace or even clean the mesh.
If there is a suspicion that there is no voltage on the fuel pump, there is a way to quickly check. It is enough to turn the ignition key and listen, because at the moment of turning the key must be heard the light hum of fuel pump. If this buzz does not hear, it means that there is no power to the fuel pump, there are problems with wiring, etc.
We add that this method of determining the operation of the pump for sound is not suitable for all cars. On some models (especially the premium class), noise insulation is at a high level and the fuel pump is included immediately after opening the driver's door, and not during the turn of the key in the lock. In this case, it may seem that the gas station does not work when the ignition is turned on, while
The sound of the pump work is simply not to hear.
Also in the overall list of possible reasons why the fuel pump does not have:
- failure of the fuse of the gas station;
- breakdown of the gas station relay;
- problems with the "mass" of the benzonasos;
- malfunction of the electric motor of the fuel pump;
- oxidation or contact hall and gas station terminals;
- focused fuel pump itself;
Wiring to gas station
Most cars, the wiring on the fuel pump is three wires: "plus", "minus", as well as the wire for reading the amount of fuel in the gas tank. If the fuel pump does not pump, then the cause may be no power.
To check power on the fuel pump, it is enough to take a 12 volt light bulb, feeding me up with an external fuel pump connector. After the ignition turn, the test lamp should light up. If this does not happen, it means that the problem is in external circuits. Lamps lighting will indicate the need to check the internal contacts of the fuel pump.
To test the external wiring, it is necessary to connect positive and negative contacts, which are removed from the fuel pump power connector, to the mass of the pump. Contacts You also need to connect to the gas station relay. If you place the negative contact for the mass, after which the ignition is turned on and the light lights up, then this means that this contact is faulty. In the event that the lighting of the bulb did not happen, then the problems with the "plus" are obvious. If you place contact on the relay and the light bulb lights up, there was probably damage to the wire on the segment that connects the relay and the fuel pump itself.
Electric motor Benzonasosa
If the pressure test in the fuel rail and external wiring on the fuel pump gives positive results, then the gas station motor should be checked. The specified electric motor is responsible for circulation of gasoline inside the fuel pump.
During the inspection, it should be borne in mind that the terminals on the fuel pumps themselves have an oxidic property, as a result of which the power is not supplied and the pump does not pump. In this case, the motor worker, but the terminals must be cleaned or turned.
To believe the gas station motor, you will need to fix the wireless lamp wires on the cleaned and good terminal of the electric motor, after which the ignition should be turned on. The lighting of the bulb will indicate that the gas station motor does not work.
Contact of the mass of the fuel pump
On problems with the mass of the gas station may indicate the fuel level sensor that works incorrectly. Mass can be poorly fixed, the fuel pump in this case does not pump fuel. The mass wire is usually under the dashboard and goes through the cabin. It is necessary to find the specified wire, check and clean all contacts, then securely secure the mass on the fuel pump.
The gas station relay is often attached next to the mass of the fuel pump, that is, under the dashboard. A normally working relay after turning on the ignition in a couple of seconds allows the pump to create pressure in the system and immediately turns off.
At the time of rotation of the ignition key, the driver hears the characteristic click (the relay turned on), then the similar click will indicate to shut down the gas station relay. If no such clicks are heard, it indicates a malfunction of the relay or its contacts. The optimal solution will replace the fuel pump relay to a new or obviously suitable device. We add that the cost of spare parts is quite affordable.
Fuse Benzonasosa
During diagnostics, it is necessary to check the fuse of the gas station. The specified fuse at 15 and is usually located in the fuse block in the boilerspace and has a Fuel Pump marking, which is translated and means the fuel pump.
The fuse of the fuel pump must be pulled out and inspect its contact. Contact integrity will say that the device is normal. Damaged contact will indicate that the fuse of the fuel pump burned. In this case, you need to put a new fuse, which has a very low cost (as in the situation with the fuel pump relay).
Other reasons for fuels of fuel pump
Frequently, a non-professional installation of additional electrical equipment or security anti-theft systems leads to the fact that the power supply to the fuel pump disappears due to the rebound contacts or other connection errors.
Also should not be excluded and the possibility that in the car alarm or security complex there was a failure, after which the power supply of the fuel pump occurs. In other words, .
Finally, add that the fuel pump in the gas tank is immersed in gasoline, which is actively cooled. The habit of riding with an empty tank can quickly remove the fuel pump electromotor, as its burning occurs.
Read also
What functions performs a gas station relay, signs of breakage. Where the fuel pump relay is installed, how to properly check the fuel pump relay.
When the ignition is turned on, the check engine indicator does not light up, or it lights up, but it turns out even before starting the engine! In this article, I will tell you in detail about the causes of such a malfunction and give your recommendations for the method of eliminating it.
According to the instructions, the check engine "Check Engine" should turn around when the key is positioned in the ignition lock by 180 degrees, and then, after starting the engine - go out. But it happens that in various situations she stops burning even before the engine is launched.
Why the indicator does not light up C. heck. E. ngine.
So, the check is obliged to light up, as soon as the SZ vehicle is included, and go out - as soon as the engine is headed. This testifies to the normal operation of the car. Otherwise, if the check is burning during a ride or does not respond at all, you need diagnostics in a hundred.
To begin with, we will find out what is the purpose of the indicator. It turns out that a check in English is literally literally like "Check the engine." In other words, if the indicator lit in the course of the vehicle movement, it means that the ECU of the machine sends an explicit signal to the driver that there is some kind of malfunction in the work of the engine.
Specify the problem, unfortunately, the ECU is not capable. On the other hand, if you know, the check is responsible for which systems, you can draw appropriate conclusions.
In the previous article, I have already managed to tell you about
The reason for the malfunction will be not so difficult if the indicator does not light up after switching on the SZ. The driver sat behind the car's wheel, scrolled the key to the half turn - the indicator should light up. If this did not happen, you must try to test for several moments yourself.
Does not burn Check Engine - Cause Sexing Rechargeable Battery
The most banal, which could happen, this is a sitting battery. The car has long stood without going on the street or in the garage, respectively, the battery was discharged. Check such developments are easy to test, it is enough to test, whether the other light bulbs on the instrument panel are included, whether the headlights are burning, etc. Akb for a modern car is a full-fledged power supply, and therefore no electronics machine is capable of functioning without it.
What can happen to batteries? Is it just discharged due to downtime? It turns out no. In addition, due to the temperature difference, the contacts of the battery terminals may be oxidized, and not transmit the voltage. In addition, one of the terminals or both may just move away, sitting not very tightly, without providing proper contact. Another option is the wiring that comes from the battery. It is also recommended to check it, because it is possible to break the wires in any place.
Check Engine does not light up when turning the key - the ECU system is faulty
Other reasons for a secondary nature
In addition, other reasons for a secondary nature are possible:
Failure in the system, because modern technologies, unfortunately, are not perfect and issued a lot of mistakes;
- Faulty fuses and relays responsible for the Check Engine light bulb and the car ignition system;
- Problems with the ignition lock by which the system is turned on;
- Light bulb itself inside the instrument panel.
If you find yourself a reason why the check goes out when the ignition is turned on, it was not possible to immediately go to the service. Remember that it may have a heavy malfunction in the car, and your Iron Friend requires urgent help.
Video for whyCheck. Engine does not light up when the engine starts
Often the malfunction in the work of the car, we notice directly while driving on it. However, it happens when it is convenient to go to the driver's seat, with the usual movement inserting the key in the ignition and turning it 180 °, you do not hear anything instead of the usual "roaring" of the engine. It is clear that such a situation does not promise anything good, but if you already had to face it - it will have to solve the problem immediately. After all, it may not be allowed to stay without a car. In today's article, you can learn all about the most common ignition faults, the features of the diagnosis of this car system and eliminate all faults.
1. What to do if the car ignition does not turn on?
The lack of the ignition lock reaction to the key turn is, it is probably the worst thing to expect a car owner. On the one hand, the breakdown may be completely empty, and on the other - try first this breakdown. After all, under the hood of the car, there are so many systems and individual details with which it is connected that in search of the cause of the fault of the latter can spend several days in a row. Almost every node can cause the car will not start.
So let's figure it out what to do if the ignition does not turn on. Of course, it is necessary to carry out the primary diagnosis of the car and try to determine what is the matter. In particular, some ignition malfunctions can be defined even for a number of external signs. The fact is that they can coincide with malfunctions in fuel supply systems into the engine combustion chamber. In this regard, the primary diagnosis must be comprehensive.
The external signs of ignition malfunction include:
- difficulties in the implementation of attempts to start the engine or the inability to do this;
Instability in the engine at idle;
A noticeable reduction in the power of the automotive motor;
Elevated gasoline consumption with the usual operation of the car.
Undoubtedly, the voiced signs can manifest themselves if the ignition albeit with difficulty, but it works. However, many car owners do not give them much importance and begin to grab the head already when the ignition does not turn on at all. In this situation, it will be very difficult to correct the situation, and the most correct advice will sound as follows: immediately refer to the specialists. But if you do not have such a possibility, and you will be desirable to try to independently leave the position, first of all you should familiarize yourself with the most common ignition faults.
2. The most common ignition malfunctions: Is it worth panicing?
In order to determine the breakdown and, of course, it is necessary to correct it, you need to know about the existence of different ignition systems, which can be found on cars today:
- contact system - high voltage in the system and the transfer of it to the cylinders is carried out using contacts;
- contactless- the contact breaker here is replaced by a contactless sensor;
- electronic- High voltage in the system and the transfer of it to the cylinders is carried out using a special electronic device.
But whatever system is installed on your car, faults can be identical. The most common for all of the above systems are the following:
- malfunctions associated with incorrect work or burning of spark plugs;
Faults of the ignition coil;
Break of connections in the electrical circuits of the car - wire oven, looser of connections, oxidized contacts).
Since the electronic system is the most common for modern cars, it is worth noting another, very common cause of the cause of the breakdown. Of course, the malfunction in the work of the electronic control unit can cause a similar situation, which directly affects the operation of the ignition. Most often, the reason lies in the presence of defects in the input sensors.
The case is even worse with the contactless system, because even the sensor cover of the distributor can interfere with its work. Also, if the ignition of the contactless system does not turn on, then the reason may be hidden in the malfunction of the transistor switch or the ignition timing regulators.
But in general, the reasons may be very much, although with the departure of the contact system of the ignition, most of them ceased to be relevant to modern car owners:
- incorrect operation. For example, poor-quality gasoline was filled into the tank, or the frequency of servicing the gas station was very large;
Low-quality structural elements were included in the system to which candles can be attributed, highly and low-voltage wires and the ignition coil itself;
Impact on the car and its system of a number of external factors. It is not only about the impact of atmospheric phenomena, but also on possible mechanical damage.
Specialists share all ignition malfunctions into three general categories: problems associated with electronics, with a ignition coil and poor-quality fuels. Of course, such a classification is very primitive, however, it is necessary to navigate if ignition is not included.
Ignition malfunctions associated with incorrect connection and operation of automotive electronics Because it is the most common cause of ignition failure, first of all, you need to pay attention to the fuses. Of course, not all ignition systems have fuses, but if they are - be sure to make sure that none of them burned. If it's not about them, then the reason may hide in:
1. Corrosion of the automotive battery. Due to the long-term operation and influence of external factors, the power supply connectors are polluted and even can be covered with rust. Because of this, the connection is breaking between the battery and the other "organism" of the machine. To understand, whether it really should be either clearing the terminals from rust, or replace the battery. If the car still did not start - the reason will have to look next.
2. Battery, which just sat down.
You can check the power of the power supply current using a conventional tester. However, it is possible to understand this and on external features: if, when you turn on the starter, it still happens light impetus - it means that the battery really discharged.
3. Fravel the ignition switch. Try turning the key to the first position and make sure that the red signals are lit on the instrument panel. If not, the problem is in the ignition switch. Also, if when you try to start the car, the lights of the signal lights will not be overtaken and not even fasten - the reason may be hidden in the malfunction of the ignition lock.
4. Fault of the starter connections. This element may also affect corrosion over time. If the system has a voltage, but the starter does not respond to the key turns, most likely, it will need to be replaced.
Faults of the ignition coil
To determine the performance of the ignition coil, it is necessary to use a special device called a multimeter, which is intended to measure the resistance force. If, after testing, you will find that the coil does not work - it must be immediately replaced.
Together with the coil, it is important to check the ignition distributor cover. The fact is that when the temperature drops and due to high humidity under its lid, water can accumulate. If, removing it from the distributor, you discovered condensate - wipe the cover with a dry cloth. Also pay attention to whether there are cracks on it. After the lid is installed back, try again to start the car.
If the ignition does not turn on, then the reason may also hide in its coil. It can either be reborn or blown due to short circuit. If there are obvious traces on it - the coil must be replaced.
Ignition malfunctions caused by the use of bad fuel
Bad fuel is also a very frequent reason that the driver does not get a car. If we are talking about injector engines, you can call a number of subsystems that can cause a similar situation. And the most important complexity is that it is possible to diagnose such problems only by serious computer diagnostics. However, about some things that can be implemented even in the garage, we still tell you:
1. Check the electrical systems that are directly responsible for fuel injection.You need to find a connector on the top of the injector itself, as well as inspect connections on the inlet and on the cylinder heads. Ideally, it is necessary to check all electrical connections.
2. Relay and fuel pump. To obtain 100% reliable diagnostics you need special equipment. If it is not, the only thing you can check is again the electrical connections of the specified elements.
Replacing the ignition coil, as well as his castle.
We hope you will be able to not only determine the cause of the ignition malfunction, but also to successfully eliminate it. Moreover, you have already possess the necessary knowledge.
