VAZ 2115 where is the fuel pump relay located, injector 8 valves

The domestic auto industry is one of the most controversial topics raised by car enthusiasts. Yes, sales of the brainchild of Tolyatti engineers annually occupy leading positions in sales rankings, both on the new car market and on the secondary market. But everyone understands perfectly well that such indicators were achieved not thanks to the quality of the cars themselves, but because of the non-standard policy of the state itself in this regard, because of which foreign dealers, one by one, refuse to supply their new models to the Russian market.

As for quality, this has never been a strong point. Of course, its cars are in the lowest price segment, which means they belong to the lowest class of cars, designed exclusively for moving from one place to another on good road surfaces. VAZ completely excludes any kind of comfort - all the technologies used date back to the 70-80s of the last century.

However, this also has its advantages. For example, the structure of such cars has long been studied and is familiar not only to technicians at service stations, but also to many ordinary car enthusiasts. Another positive point is the simplicity of the design. Unlike foreign cars, especially those produced in Germany, all their spare parts can be easily found on free sale and separately, and not assembled and at a much higher price. This way, users do not have to rack their brains over the location of parts in the car, and, accordingly, over their installation during repairs or scheduled maintenance.

Fuel pump fuse VAZ 2115

The fuel pump relay is located under the dashboard. On the passenger side, a side panel is opened that covers the beard on which the radio, on-board vehicle, and heater controls are mounted. We see a strip with three relays and fuses.

The pump relay is the lowest.
Its fuse is also at the very bottom. When you turn the key, the relay turns on for 5 seconds in order to pump up pressure in the system and turns off. After the engine starts, control of the pump passes to the computer. The mass of the pump (and fuel level sensor) is attached to the stud securing the handbrake to the body under the carpet. To get to it you need to remove the vestibule between the passenger and driver seats. There are 3 wires coming to the fuel pump: the first is +, the second is minus, the third is the fuel level sensor.

Where is

If we describe them from top to bottom, we get the following:

1. The fuse that controls the fuel pump. Its current strength is 15 amperes.

Lit

A fuse is a small element whose task in the design of electrical circuits is to melt in the event of an overload. The device melts and the current-carrying circuit opens.

Using the example of a solution from the popular VAZ Priora model, we can superficially examine the design and operating principle of the fuse. The device is small, the outer casing is made of plexiglass.

There is a conductive element inside. Such an element is based on several plates, which are made of different materials. Between these plates there is a special low-melting material. Electricity passes through this material, which allows the fuse to be an integral part of the electrical power circuit of the fuel pump. Fuses have a special marking in the form of the letter F. This designation indicates that the fuse element belongs to a circuit whose power is not large. To calculate the current that certain devices are designed for, you need to divide the power by 220. The result will be a figure in amperes.

If the fuse is blown, then such a malfunction is often caused by the following reasons:

— failure of the fuel pump relay;

- low quality of the fuse itself;

In other words, more often the fuel pump fuse blows due to faults in the electrical circuits or as a result of failure of the components of the pump power circuit. Note that situations also arise when the fuel pump fuse burns on its own, but this phenomenon occurs much less frequently with high-quality elements.

How to identify a malfunction

The fuel pump relay turns on the fuel pump and delivers fuel to the injectors. The safety relay is activated when the engine is not running and the ignition is on (the control unit does not receive speed signals). This relay is switched off in the control unit via a safety switch and interrupts the power supply to the pump. For example, in the event of an accident, gasoline cannot flow into the engine. Checking the fuel pump is a job most likely reserved for service centers. In this regard, to find errors, we will limit ourselves to the following points:

— disconnect the fuel supply line at the distributor, while preparing a rag for spilled gasoline;

— even when the engine is turned off, a certain amount of gasoline may come out, since the system is under pressure;

— turn on the ignition for a short time without turning on the starter;

— if the pump does not start working, check the fuse or safety relay again;

— if fuel does not flow, check the pump relay;

Retreat

And comrades, let’s make one more digression from the topic; it is important mainly for novice drivers who have recently gotten behind the wheel and are not yet familiar with the structure of the car.
I want to say that on the instrument panel there is a red oil pressure light (oil can). If it lights up, stop the car, turn it off, and call your friends so they can drag you to a car service center on a rope. Driving with this light on is strictly prohibited. If you decide to drive home, and then figure out what kind of light it is and why it is on. Then be prepared to replace the engine. This is the engine oil pressure light. If it lights up, this indicates that the engine has run out of oil, or there is an internal engine malfunction, or the sensor has failed. In any case, you should immediately stop driving and turn off the engine. And perhaps the repair will not cost you that much. I hope my warning will keep someone’s engine and pocket intact.

Relay and fuse block diagrams for VAZ 2115

The Lada 2115 was first released in 1997 and finished production in 2012. Over such a long period of time, the electronic components of the car have changed significantly. It is not surprising that modifications of the mounting blocks have changed more than once, and with them the fuses of the VAZ 2115.

An old-style car with a carburetor required one installer in the engine compartment. With the advent of a new 8-valve injector, a second unit was needed, installed in the cabin under the dashboard. Some of the new relays were placed under the steering wheel during the 2007 and 2008 upgrades.

The design of the mounting block box has become more modern over time. To make life easier for drivers, a diagram was placed on the lid and tweezers were attached for replacing elements.

Recommendations for care and maintenance

• Buy original fuses. Domestic or foreign, it doesn’t matter;
• Install strictly in accordance with amperage ratings. Unacceptable with lower or higher current strength. In the first case, this will lead to damage to the module, in the second - to breakdown of the unit, which is attached to the fuse;
• Carefully check the quality of fixation of terminals and limit switches on the board. If loose, tighten and press with pliers. A spark can cause a fire and melting occurs;
• If moisture gets in or condensation forms inside the mounting block, remove the cover, dry it, and if necessary, blow it with a stream of compressed air.

Carry out preventive and diagnostic work in the fuse box with the battery terminals removed in order to prevent a short circuit in the circuit.

The average service life of fuses is 40 – 60 thousand km. The service life of foreign analogues is 10–15% longer. Before replacing, read the instructions and get advice from service station specialists.

Sources

• zapchasti.expert/predoxraniteli/predoxraniteli-vaz-2115.html
• drive2.ru/l/5419303/

Relay under the hood

The main one is the fuse box near the engine. The vast majority of fusible protective elements and almost all relays are located here. During the existence of the model, its modifications changed several times. The most common modern block was presented in 2008. In this release, the arrangement of individual elements has changed slightly and new ones have been added.

You can find the block in the engine compartment above all the devices in the engine compartment. It is protected by a cover that can be easily opened by pressing two latches.

PRINCIPLE OF OPERATION OF THE MAIN ELEMENTS OF A FUEL UNIT

Fuses and relays for Lanos

Fuel system VAZ 2114

CONTAINER FOR STORING COMBUSTIBLE MATERIALS

It is made of steel, consists of two firmly welded parts, the neck through which the fuel enters is connected to the tank with a rubber pipe and secured with clamps.

GASOLINE PUMP

This tool with an electric mechanism is located in a tank with a fuel mixture level indicator. Its actions are coordinated by the engine control box, through a special pump relay, which supplies fuel through the line to the injectors. At idle or when the engine is completely turned off, the pressure is maintained due to the action of a one-way lock, which is located near the unit itself.

The VAZ 2114 power system has a fuel pressure regulator and injectors. The voltage is supplied to them from the battery through the main relay. Thus, the amount of driving fluid is indicated by the duration of the pulses, which are generated by the engine control unit and transmitted to the injectors.

RAMP

Located on the intake manifold, it includes a fuel control element and a pressure valve with a spring-loaded diaphragm. It, in turn, divides the regulator body into 2 parts: the fuel part regulates the pressure of the combustible mixture, the air part, due to the rarefaction of the air, raises the membrane and produces constant fuel pressure readings in the rail.

When the engine starts, the vacuum behind the damper decreases, the diaphragm closes the power system valve, so the pressure increases. When the vacuum is maximum, then the fuel pressure decreases. The regulator is not dismountable, so if it fails, it is replaced with another one.

FUEL MIXTURE CONTROL SENSOR

The pump module has a float, which is located in the tank cavity. When the position of the float changes, the resistance of the unit changes proportionally. According to a certain signal, the fuel quantity indicator on the dashboard displays the presence of fuel in the system.

Why does the sensor often fail?

Due to:

• fragility of the case;
• frequent temperature changes;
• condensation formation in the tank;
• when using a low-quality combustible mixture;
• oxidation of contacts when sealing is broken.

That is why it is so important to carry out preventive maintenance on time, clean the unit, change contacts in order to prevent its destruction. Changing a device is not that easy. Many markings are original and unique, which means that the services of professionals will be required, which are also not cheap

HOSES AND PIPES

Such irreplaceable products guarantee uninterrupted circulation of flammable liquid from the container to the main line and nozzles, and if there is excess, they transfer the residual liquid back to the tank. The pipelines are located on the bottom of the vehicle, they need to be carefully checked, cleaned, inspected for integrity, various deformations identified and promptly eliminated in order to avoid fuel leakage, as well as poor transmission to the injectors.

Another function of the pipelines is the transfer of fuel vapor from the tank to the activated carbon section, where waste is collected when the engine is turned off. After it is started, the electromagnetic device is triggered and the vapors escape into the engine, where they are destroyed.

HIGHWAY

The design of the VAZ 2114 fuel system includes a main line that guarantees the supply of fuel to all injectors. Today, the fuel pressure regulator is placed in the tank and is not located on the line; there is also a service valve, which performs the function of eliminating air after a technical inspection of the vehicle.

The fuel injection system of the VAZ 2114 includes an uninterrupted mode for collecting fuel vapors, and the gravitational unit located in the device helps prevent fuel from leaking when the vehicle is in an emergency position.

When the engine's air consumption is high, the system is purged more intensively. The filter element is made of durable paper material, after which the air moves through the mass air flow sensor and moves into the intake hose, which leads to the throttle assembly.

Thus, the operation of the fuel fluid supply mode of an engine with a fuel injection system on a VAZ 2114 car occurs.

VAZ 2115 fuse diagram

The most common models are 3722010 (since 2004) and 21150 3722 010 10. The set of protective elements of electrical equipment in them is not very different from each other, but there are differences, and they are reflected in the decoding of the diagrams below.

The main mounting block under the hood of the car.

What problems might you encounter when replacing?

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The main problem that arises when replacing a fuel pump is the lack of the expected result: there is no fuel supply, or it is supplied intermittently.

Therefore, before starting all work, you need to make sure that the problem is really in the pump itself. After all, a weak fuel supply can be caused by a clogged fine filter, problems with the fuel lines - sometimes they can simply bend somewhere in an unexpected place, or dirty injectors on the fuel rail.

Even an air filter that is not replaced on time or a coked throttle valve can cause effects that look similar to insufficient fuel supply. But the most common problem is a poor contact in the electrical connector of the fuel module or a simply blown fuse.

Good luck to you and your car friend! Be always healthy!

Some useful tips

To ensure that the fuses in your VAZ-2115 last longer, and the failure of any of them does not take you by surprise, use the following tips:

1. At least once a quarter, check the condition of the mounting block, its board and the protection elements installed in it. Do not allow moisture or dirt to get inside. If necessary, take care of its additional protection.
2. When undergoing maintenance, ask an auto electrician to check the performance of the vehicle’s on-board network. If they deviate from the norm, take care of repairing the machine.
3. Do not overload the vehicle's on-board network. Do not use electrical appliances that consume high current.
4. Under no circumstances use homemade bugs instead of fuses. This can cause not only a short circuit, but also a fire in the machine.
5. Carry a spare set of fuses with you. It costs 150-200 rubles, takes up virtually no space, and can help out at the right time.

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