Speed sensor 2110, 2111, 2112, how to check and replace the speed sensor with your own hands. how to check and replace the speed sensor on a VAZ 2110, 2111, 2112. checking and replacing the speed sensor on a VAZ 21

Every modern vehicle uses a speed monitoring system so that the motorist can be aware of the driving speed. The elements that are part of this system must be working, since the motorist must know the speed of movement. What is the VAZ 2110 speed sensor used for, what malfunctions are typical for it, how to replace the device? We will talk about this below.

The VAZ 2110 speedometer does not work, what should I do?

The vast majority of VAZ 2110 cars are equipped with electronic odometers. They can disturb their owners with various malfunctions, which, as a rule, manifest themselves in different ways.

A speedometer is one of the main instruments of a car, which is used to measure the speed of a vehicle. Its breakdown, of course, does not lead to serious malfunctions in the operation of the car, but when the speedometer needle jumps from one indicator to another or even hangs at some value, it deprives the driver of the ability to control the speed of the car.

This can lead to both fines and more serious consequences. Therefore, if the VAZ 2110 speedometer does not work, it is necessary to carry out repairs, especially since this process can be quite easy and fast if the cause of the malfunction is correctly identified.

Malfunctions

On VAZ 2110 cars, the speed sensor can fail for several reasons:

Oxidation of contacts. This is the most minor damage. However, it can cause the needle to drop to zero or jump. To eliminate it, you must thoroughly clean all contacts from dirt;
Wire chafing. The main sign of this breakdown is that the needle falls or jumps after starting the engine. Such a malfunction is not always detected visually, since in some cases the wire may outwardly appear intact, but in fact has a break. To determine the location of the damage, you need to ring it using a special tester. A broken wire is often the cause of failure of the instrument panel, and in particular the speedometer;
The sensor has stopped working. In order to make sure that the breakdown is correctly identified, you can take a new speed sensor and connect it. If the speedometer starts working after this, then the conclusion is obvious. Failure of the speed sensor may occur due to the housing not being sealed, as a result of which dirt, dust, and moisture can enter;
Checking the connectors. In VAZ cars they are located in such a place that they are constantly in contact with dirt and quite often this is the main reason that the speedometer needle jumps or refuses to work at all, showing incorrect vehicle speed values;
Drive unit. Also, the reason why the needle jumps on the speedometer may be wear of the shaft. With such a malfunction, the VAZ 2110 speedometer drive does not effectively transmit torque. It is worth noting that this is one of the most common reasons why the sensor needle jumps.

If the vehicle speed indicator does not work correctly, before purchasing a new device, you need to check all possible breakdowns and only then think about replacing it.

Replacement features

The speedometer is located on the main instrument panel. And if, after checking all possible reasons why the device does not work, it turns out that all the faults lie in the device itself, then the entire panel will have to be replaced, and not just this individual element.

Today, unfortunately, spare parts for dashboards are not sold and this complicates the entire replacement process. It is worth noting that when installing a new device, you can rewind the mileage indicators.

Replacement

If during diagnostics it was determined that the needle is falling or jumping as a result of a breakdown of the speed sensor itself, it needs to be replaced. This manipulation is quite simple, but still requires certain knowledge and skills from the car owner.

To replace the speed sensor you will need special keys. It is better to carry out manipulation from above the engine. First, you need to disconnect the battery ground and contact chips, then remove the device using a key. If the rod is broken, then you cannot do without removing the drive. Here you need to be especially careful.

If the arrow jumps, lies or freezes, then repairs must be made as soon as possible. It is better to entrust such work to professionals, since without the necessary experience and certain knowledge, replacing a device can be done poorly.

Only professionals at service stations can quickly remove and install new equipment. As a rule, such a procedure does not take much time and its cost is low.

Preparatory activities

Proper replacement of the speed sensor on a VAZ 2110 implies the mandatory purchase of a new device that meets all the requirements of your car.

Connector

Basically, when purchasing a device, follow two basic rules.

Choose a sensor whose connectors inside the block are marked -, A and +. Usually the designations 1, 2 and 3 are used there. There is no fundamental difference between them, it will simply be much easier to carry out the pinout with such markings. It is the incorrect connection that often becomes the reason that you have to seek help from a service station. And these are completely different financial costs.
The rod on the element must be made of metal. If the stem is plastic, it will last you about 6 months. It is not in your best interest to replace regularly. But don’t forget to check the metal rod for play, correct rotation, and the presence of a washer in the package.

Reasons why the speedometer does not work on the VAZ 2110

The vast majority of VAZ 2110 cars are equipped with electronic odometers. They can disturb their owners with various malfunctions, which, as a rule, manifest themselves in different ways.

Malfunctions

On VAZ 2110 cars, the speed sensor can fail for several reasons:

Oxidation of contacts. This is the most minor damage. However, it can cause the needle to drop to zero or jump. To eliminate it, you must thoroughly clean all contacts from dirt;
Wire chafing. The main sign of this breakdown is that the needle falls or jumps after starting the engine. Such a malfunction is not always detected visually, since in some cases the wire may outwardly appear intact, but in fact has a break. To determine the location of the damage, you need to ring it using a special tester. A broken wire is often the cause of failure of the instrument panel, and in particular the speedometer;
The sensor has stopped working. In order to make sure that the breakdown is correctly identified, you can take a new speed sensor and connect it. If the speedometer starts working after this, then the conclusion is obvious. Failure of the speed sensor may occur due to the housing not being sealed, as a result of which dirt, dust, and moisture can enter;
Checking the connectors. In VAZ cars they are located in such a place that they are constantly in contact with dirt and quite often this is the main reason that the speedometer needle jumps or refuses to work at all, showing incorrect vehicle speed values;
Drive unit. Also, the reason why the needle jumps on the speedometer may be wear of the shaft. With such a malfunction, the VAZ 2110 speedometer drive does not effectively transmit torque. It is worth noting that this is one of the most common reasons why the sensor needle jumps.

If the vehicle speed indicator does not work correctly, before purchasing a new device, you need to check all possible breakdowns and only then think about replacing it.

Replacement features

Replacement

Only professionals at service stations can quickly remove and install new equipment. As a rule, such a procedure does not take much time and its cost is low.

Installing a new element

Before replacing the speed sensor, you should purchase a new element that matches the shape of the connector. It is necessary to take into account an important point: on the connecting block of the factory product, near the contacts, the marking numbers “1”, “2” and “3” are marked. But on sale there are more often sensors where a different marking scheme is adopted; instead of numbers there are symbols “-”, “+” and “A”. There is no tragedy in this, you just need to know that the new speed sensor pinout is combined with the old one as follows:

the symbol “+” and the number “1” are the same thing;
the symbol "-" means "3";
the letter “A” is the output wire, corresponds to the number “2”.

In addition to the contact group, when purchasing, you should pay attention to the material from which the element drive, combined with the gearbox shaft, is made. It is recommended to buy a sensor with a metal drive, since plastic parts are not durable.

Replacing the sensor is a simple task, performed in the following sequence:

Turn off the ignition and remove the negative contact from the battery.
For ease of access, disconnect and remove the air filter along with the air duct pipe.
Disconnect the connection block.
Unscrew the element, grabbing it by the edges with a 22 key.
Clean and wipe the area from dirt, screw in the new sensor along with the gasket.

https://www.youtube.com/watch?v=x_BfBpNW9zEWhen finished, connect the wires, put the removed parts back in place and check the functionality of the sensor while driving using the speedometer.

Any car is equipped with a system that shows the speed of movement and mileage (distance traveled). It is the speedometer, which is a device for determining instantaneous speed, that makes it possible to find out what the maximum speed of the VAZ 2110 is.

Speed sensors are installed only in fuel-injected cars; where carburetor engines are present, they are not present. This device is responsible for the supply and consumption of fuel, setting the ignition timing, and monitors the quality of the combustible mixture. All data is transmitted to the electronic control unit, which controls the injector.

What else is the reason for the speedometer not working?

However, often the reason for the speedometer malfunction lies elsewhere:

Oil and dust get into the speed sensor, which is located in the engine compartment under the hood of the car.

The malfunction is eliminated after removing dirt and oil by washing the sensor. If the DS fails and needs to be replaced, any car owner can perform this simple operation independently. The replacement sequence is as follows:

place the machine on a flat horizontal surface;
open the hood and find the speed sensor on the gearbox;
by pressing the latch bracket, the plug is disconnected from the DS:
to remove the sensor, use a 22 mm wrench, turning it counterclockwise;
The new part is installed by screwing it in by hand. The use of a wrench is not recommended, as you may miscalculate the rotation and break the thread;
install the connector, as evidenced by the click of the fixed part.

The driver should buy a new DS with similar markings. Otherwise, the speedometer needle will display incorrect readings.

For some unknown reason, the VAZ 2110 speedometer stopped working. First of all, you need to check the most accessible elements associated with the speedometer. Since the car compartments are not ideally clean, dirt and moisture can damage any part, including wires and contacts.

Under the influence of moisture and dirt, wires and contacts can oxidize. Eliminating this cause is simple: the contacts must be removed, cleaned of oxidized deposits, wiped dry and reinstalled. It is also necessary to check the integrity of the wires.

Externally good wires may have broken sections of cores inside. Checking the serviceability of the wires involves ringing their surface with a tester.

During operation, the splines and elements that rotate the speedometer cable may be damaged. Such a defect may impair the operation of the instrument panel. You can verify its serviceability by testing it.

The third, very important defect is the malfunction of the speed sensor. This device is located on the gearbox, adjacent to the exhaust manifold. This factor leads to heating and chafing of the DC wires.

The reasons for the sensor being out of working condition, the fault can be determined at the service center. The technician will perform this procedure in the presence of the car owner. To troubleshoot the problem yourself, you should do the following:

The speed sensor must be removed by unscrewing it from the gearbox;
connect the DC wire to a screwdriver or drill, set the rotation counterclockwise;
turn on the ignition.

The movement of the arrow indicates that the sensor is working properly. The weak link is most likely located in the vehicle's transmission. It is difficult for a driver without experience to cope with this task.

In this case, the problem must be solved by car service specialists. If the speedometer needle on a VAZ 2110 does not work, the speed sensor must be replaced.

The speedometer on a VAZ 2110 with an injector is an important element of any car, not excluding the “top ten”. VAZ 2110 drivers even with little experience can check and find the source of the malfunction of this device.

However, if you cannot determine the source of the speedometer problems, you need to draw the attention of technical service specialists to this problem.

As you know, devices installed in a car allow you to monitor the situation while driving on the streets and monitor the operation of the engine and all other systems. Among others, the speedometer occupies a special place. It is located on the dashboard directly above the steering wheel. With its help, the driver finds out at what speed the car is moving.

In a situation when the speedometer and the injector installed on the VAZ-2110 do not work properly, the person behind the wheel puts both his own health and the lives of passengers at risk. At the same time, he can easily “earn” a fine from a traffic police officer for speeding too high. Thus, a working speedometer allows you to avoid a considerable amount of trouble.

Troubleshooting

To begin troubleshooting the problem, you first need to find the device. From the photo you can determine how the speed sensor on the VAZ 2110 looks externally.

Ears for fastening

As for its location, look in the engine compartment in close proximity to the exhaust manifold. They say frankly that the place where it is installed cannot be called ideal. It's all about the collector. While the car is running, the manifold heats up. The sensor wires rub against it, which over time leads to malfunctions and short circuits.

Therefore, experts recommend that the first step is to properly insulate the wiring, and also use some kind of clamps so that the wires do not come into contact with the collector. This significantly extends its service life.

Having checked the device visually and not determining the presence of breakdowns, this tells us that the element itself is faulty. This problem can be solved by replacing it.

Causes of malfunction of the speed sensor.

Speed sensor VAZ 2110
If the speed indicators on the dashboard do not correspond to reality, this does not mean that the speed sensor has failed. Although the price of the sensor is relatively low and replacing it is quite simple, you should not do this until it is fully confirmed that it is at fault for the malfunction.

The reasons for the failure of the speed sensor may be:

The presence of traces of oil or deposits of dust and dirt on the surface of the device. Due to contamination of the sensor, the signal is distorted and incorrect speed readings are displayed on the dashboard. In this case, the problem can be solved quite simply - you need to check the surface for dirt and clean it.
Violation of the tightness of the conductors, or loss of communication with the ECU. Violation of the sensor structure and its subsequent failure, or extraneous mechanical influences on the speedometer conductor. Thus, the cable may move unevenly or touch the external protection, thereby complicating the move and dulling the signal. In this regard, the correct functioning of the car speed sensor is disrupted. Also, the analyzer will not work correctly with increased cable vibrations.

Vehicle traffic control

This function is performed by the speed sensor, which takes part in the formation of the fuel mixture by the controller. It replaced the mechanical cable drive previously installed on carburetor VAZ 2112 models. The operating diagram of the element is as follows:

The speed sensor is driven from a shaft located inside the gearbox.
From the controller side, the device receives a reference voltage of 12 V.
In response, the sensor produces a signal in the form of a pulse of a certain frequency. The frequency varies depending on the speed of the car.
Based on these pulses, the controller controls the speed indicator and odometer on the dashboard, and also creates a rich or lean fuel mixture for the engine.

Signs and causes of DS (speed sensor) problems

Failure of the speed sensor can be determined visually during a trip. This occurs when the speedometer needle jumps, gives clearly incorrect readings, or falls to the zero mark. If, at the same time, the odometer ceases to determine the distance traveled, then the most likely cause of the breakdown is sensor failure.

Additional signs of a malfunction may include uneven operation of the power unit at idle, as well as too high fuel consumption.

Speed sensor device

Why doesn't DS work? There may be several reasons:

The terminal block is dirty;
Contacts are oxidized;
The wiring is frayed or melted;
No contact due to a loose connector;
Damage to the sensor itself.

The device is installed under the hood next to the exhaust manifold, on the gearbox. It is exposed to oil vapors and is poorly protected from dirt. The sensor wire may fray or melt due to being near very hot elements of the car. On a VAZ 2110 with an injector, this often leads to the disappearance of contact and the cessation of signal transmission to the speedometer.

An unambiguous answer about the serviceability of the sensor can be obtained by replacing it

However, when buying a DS, you need to pay attention to its model. Firstly, you should make sure that it is compatible with the previous one, and secondly, it is recommended to pay attention to the material of the rod

It is preferable to purchase a sensor with a metal drive rod rather than a plastic one.

Sensor with metal rod

This design is highly reliable and will last quite a long time, while a plastic one can fail within a few months.

When purchasing a device, it is important to make sure that there is a washer on the rod, there are no backlashes, and that the kit corresponds to the attached documentation for the sensor

All of the above questions are related only to injectors, because in carburetor systems there is no DS as such. Torque is transmitted to a mechanical speedometer using a cable system, without any electrical converters.

Symptoms of a problem

The problem may be that the connection diagram is broken, there are disturbances in the electrical circuit, or the connector does not work. In addition, the pinout of the speed sensor, which was mixed up during the assembly process, often becomes a problem.

An indirect sign of a malfunction is that the car stalls when idling.

You, as a driver, will easily notice the presence of incorrect indicators on the speedometer, and also pay attention to the warning light that requires you to check the engine (Check Engine). If such phenomena are detected, there is no doubt - the speed sensor needs to be replaced.

Replacing the VAZ 2110 speed sensor

The main cause of speedometer problems is a failure of the speed sensor, and if the DS is faulty, it must be changed. It is not difficult to replace the sensor on a VAZ “ten”; almost any driver can do this work independently. The operation is especially simple on a car with an 8-valve engine. Let's start replacing:

we place the car on a flat horizontal plane; you can do without a pit or a car lift;
we find the sensor - it is located on top of the gearbox housing, not far from the oil dipstick;
to disconnect the plug from the sensor, press the locking bracket;
use the key » 22 counterclockwise to turn off the sensor itself, often the DS is turned away by hand;
When installing a new part, we use manual force; it is not recommended to tighten the DS with a wrench, as you can break the part or strip the thread.

When installing, we put the connector in place, it should click into place, and the work can be considered complete. With sufficient skill, this operation is completed in 5-10 minutes.

Car owners often encounter a problem when, after replacing the sensor, the speedometer needle begins to “lie” - show the wrong speed. It should be noted that several types of DS have been developed for the VAZ “Ten”, and they have different catalog numbers

When purchasing, you should pay attention to the number that the sensor has failed, and you must purchase a new part only with the same marking

Some recommendations

The search for the cause of the speedometer's inoperability should begin with an external inspection of the DS and the wires going to it. Wires often break in close proximity to the plug.
If the speed sensor is covered with a layer of dirt or oily, you need to remove it, wipe it, reinstall it and check the speedometer readings again. Perhaps after this the instrument needle will again begin to show speed normally.
If you cannot figure out the problem yourself, you should contact an electrician at a car service center.

Carburetor models use a cable mechanical speedometer system, so there is no speed sensor. It's simply not needed.

Principle of operation

The VAZ-2110 tachometer works according to the standard principle. It is part of an electrical circuit with the following elements:

The device itself is located on the dashboard of the car and is completely electronic.
The ignition module operates on the principle of an inductor. Necessary for converting direct current into pulsed current.
Crankshaft position sensor or DPKV. It also converts electrical voltage into pulsed voltage.
On-board computer or ECU. It is a receiver of pulse signals. Based on the frequency of incoming pulses, it makes calculations for the injection system, and also converts them into electrical voltage, adjusting the operation of the tachometer.

The whole circuit works as follows:

After the power unit has started working, the crankshaft position sensor begins transmitting signals to the computer. Magnetic type crankshaft position sensor. Reacts to the absence of one tooth of the engine drive gear. As soon as an empty space passes near the sensor, it opens, thereby creating a pulse. For one revolution of the shaft, 1 pulse is created.
The ignition module on the 8-valve version 2110 operates on the principle of generating pulse signals without rotation; it is stationary. The pulses are generated by 2 inductive coils. For one revolution of the power unit, 2 pulses are generated from the module. Due to pulses from the DPKV, the on-board computer transmits the discharge current to the ignition module.
The pulse current transmitted from the DPKV to the ECU is converted into a constant voltage, which is transmitted to the tachometer receiver unit. The strength of the incoming current determines the strength of the magnetic field formed by the device’s coil, and therefore the angle of deflection of the tachometer needle.

The whole system is simple, consisting of a small number of elements. But any problem causes interruptions in the operation of the engine and the tachometer itself.

Next, a description will be given of the main symptoms that precede the tachometer failure.

Purpose

This device is responsible for the correct fuel supply, “sets” the ignition timing and controls the quality of the combustible mixture.

The sensor “collects” a lot of data for the injector (such as engine speed, speed, detonation level, etc.) and transmits digital signals to the electronic unit. In turn, all data is checked here and appropriate adjustments are made to the operation of the injector.

How much does a replacement cost?

If the breakdown is not due to dirty contacts or broken wiring, it is better to replace the sensor. Moreover, it costs 170-400 rubles, depending on the type and manufacturer. The cost of replacing it at a service station is 100-150 rubles.

Sensor part numbers:

with mechanical drive - 2110-3843010F;
electronic (new) - 2170-3843010.

When choosing a DS, pay attention to where it was manufactured. If a mechanically driven sensor requires replacement, under no circumstances buy Asian analogues - the drive gear is made of very low quality plastic

It happens that it breaks on the third day of use. In this case, you will have to disassemble the entire box to remove its fragments.

It is better to purchase a sensor with an all-metal drive.

DIY replacement instructions

Now let's take a look at the procedure for replacing the device. Before replacing, you need to buy a new sensor. It is best to purchase a DC with a metal rod - such devices are considered more reliable and usually work much longer. There is nothing complicated about the replacement; the procedure is described in detail below (video published by user Inzil Nazmutdinov).

Stages

How to change the speed sensor on the “Ten”:

First of all, you should turn off the voltage in the vehicle's electrical network. Turn off the ignition, then open the engine compartment and disconnect the battery terminal.
Then find the speed sensor and disconnect the wire with the connector from it. When disconnecting, it is advisable to remember the pinout of the contacts on the plug in order to connect the device correctly.
As for removing the speed sensor, you can simply unscrew it by hand. If the device is fixed in the seat too tightly, then to dismantle it you will need a wrench of size 21 or 22. The size is inaccurate, since the design of the device and, accordingly, the dimensions may differ.
After dismantling, we recommend that you check the correct operation of the drive itself. To do this, unscrew the nut that secures it to the transmission box. Remove the drive carefully, since its rod should under no circumstances get into the gearbox housing, otherwise you will need to dismantle and disassemble it.
Install the new speed sensor; the installation procedure for all components is carried out in reverse order.

Photo gallery “Changing DS with your own hands”

Symptoms of problems, checking the speed sensor

If the odometer is not working, and the speedometer is “jerky”, transmitting false speed or mileage readings, we can conclude that the speed sensor is faulty.

There is also the possibility that these are signs of electrical circuit problems, especially if the car has ever been tampered with. There may be a break or oxidation of the connectors, rubbing of the wiring insulation, which causes a short circuit.

Also, a sign of breakdowns are cases in which the car may stall at idle. Perhaps the most obvious symptom of a speed sensor failure will be incorrect speedometer readings and the “ChekEngine” light on the panel.

These devices have three contacts: ground, pulse signal, voltage. First, you should check the functionality of the grounding and the presence of voltage.

To check the speed sensor you need:

Remove this sensor;
Using a multimeter, calculate the contact that produces a pulse signal. “We install a plus to it, and attach the minus to the body of the car.
Carefully rotate its rod. At the same time, you should monitor the output signal. If the sensor rod starts to rotate faster, the voltage will be higher.

Do I need to change

Not only the speedometer and odometer readings, but also the quality of the fuel mixture supplied to the cylinders, the idle speed of the vehicle, engine stability and fuel consumption depend on the information received by the ECU from the sensor.

A failed DS will “confuse” the electronic unit, which simply will not understand whether the car is moving or standing still. As a result, the speed will begin to fluctuate, the engine will stall at idle, and fuel consumption will increase.

Checking a mechanically driven speed sensor is not difficult. On the removed sensor, we find the pin and turn it with pliers, having attached the connector to it in advance. If the speed sensor is working, the arrow on the instrument cluster will jump, if there is no reaction, then there is a problem with the drive or electrical wiring.

Checking the wiring to the instrument cluster is also not difficult, take a paperclip (you can use any other metal object) and insert it into the middle pin on the connector, then touch it to the engine housing, the arrow on the combination should twitch, otherwise you need to look for the cause in a wiring fault or sensor connector (oxidation, breakage, etc.).

Diagnostics

Troubleshooting begins by disconnecting the wiring block from the speed sensor harness and checking them using a test light.

To make a control light bulb, you need any car lamp that can operate at a voltage of 12 V, and two wires about 1 meter long each. One of the wires is attached to the positive terminal, the second - to the negative terminal of the lamp. The resulting device also includes a Krona battery.

To carry out the test, one wire of the warning lamp is attached to the ground of the body or battery, and the second is made with short, frequent touches to the middle contact of the DC connector. If there are no faults in the connector-speedometer section, the speedometer needle will slightly tremble or rise. If the needle shakes, the answer to the question why the speedometer does not work can be considered found - the speed sensor requires replacement.

In cases where the needle’s response to tapping on the central contact of the block cannot be detected, it is necessary to “test” the speedometer power circuit. The procedure is carried out using a multimeter (multitester), or by using the same light bulb - a control.

The wiring harness is first disconnected not only from the speed sensor block, but also from the speedometer itself. One terminal of the tester or warning lamp is connected to the end of the wire located under the hood, the other to the interior end of the speed meter current supply circuit.

If the tester in the “continuity” mode indicates a violation of the integrity of the circuit, further troubleshooting is carried out in this direction. It is necessary to check the fuses, the connection points of the wires, and their integrity inside the insulating braid.

The search area can be reduced by gradually “ringing” individual sections of the circuit. On model 2114 and other VAZ products, the cause of speedometer failure is often oxidation of the “mass” contacts attached to the car body.

In cases where the speedometer needle does not work, but there is no evidence of malfunctions in the electrical supply circuit, a logical conclusion is drawn about the malfunction of the device itself. Additional testing can be done by temporarily installing a known good instrument panel.

Causes of malfunction of the speed sensor

The absence of speedometer readings does not mean failure of the device. Although, to buy a speed sensor for a “ten”, it is enough to spend a small amount, but it will be very disappointing that the fact of replacing the speed sensor will not give the desired effect. And the reasons may be the following:

The presence of dirt, dust and oil smudges on the speed sensor, a video on replacing which can be found on the Internet. They form on the body of the product during vehicle operation. To prevent the product in this case, you just need to clean the device.
Unstable contact of the product connector and broken wiring.
Sometimes the defect is of a purely mechanical nature, which consists of banal defects in the cable of the instrument speed indicator - speedometer.

The following options are possible here:

1. Complicated uneven movement of a braided cable, which is caused by cable defects - burrs or ruptures of the metal strands of the cable. They can significantly affect the functionality of the sensor drive. 2. Increased cable speed.

Checking the device for serviceability:

We hang the front wheel of the vehicle on a jack.
We disconnect the wire contact from the product and connect a digital multimeter or similar device to it
Making rotational movements with the hanging wheel at low speed, we measure the pulse flow signal from the connector. The functionality test begins with checking the grounding and power supply of the electrical circuit.
We remove the device from its seat.
We connect the device for measuring voltage to the output contacts.
By turning the speed sensor drive, we measure its potential difference.
The output should produce data in which, as the rotor speed increases, the frequency and voltage of the output power increases.

The functionality of the device is considered satisfactory if, during diagnostics, it shows the frequency and voltage parameters at the output contact. Otherwise, replacing the speed sensor of the VAZ “Ten” cannot be avoided.

Why the speedometer does not work on a VAZ-2112: the main reasons for a 16 valve engine

When the speedometer does not work on a VAZ-2112 hatchback, the reasons may be different. Usually they try to repair the tidy, but the speed sensor turns out to be faulty. The ECU detects a malfunction of this sensor with difficulty, and the CHECK lamp does not turn on. The fact that the speed sensor is broken has to be identified by the following signs: idle speed always remains low, and the engine stalls when changing gears. These nuances will be discussed in more detail below, but we will only talk about 16-valve valves.

If all devices do not work, then one fuse is at fault. The video shows which one.

Electrical diagram

The sensor itself is powered by a voltage of 12 Volts (pink-black cord), and another pin is connected to ground. The gray wire is the sensor output. It is connected to the voltage source through a resistor (see figure).

Typical connection diagram for DS on a VAZ-2112

The diagram shows that the output is connected to the ECU terminal. Terminal number:

9 – block January 5.1, also BOSCH M1.5.4N (engine 21120, 1.5 l);
59 – BOSCH M7.9.7 module (ICE 21124, 1.6 l).

Another gray cord goes to the “red” block on the dashboard, where it connects to terminal 9.

As you can see, everything is elementary.

Instrument panel test on video (speedometer self-diagnosis)

There are some things we don't specifically consider.

Power to the circuit shown in the previous chapter comes from main relay 6. It is also called the “ignition relay”. There is also fuse 1 in the circuit.

Additional relay and fuse box

When the ignition circuit is broken, both the speedometer and the ECU module do not work on the VAZ-2112, and the engine does not start at all. So advice about checking the relay would seem stupid.

Advice for those who have an oscilloscope

If you still decide to dismantle the sensor, connect a 1 kOhm resistor to its output (to the middle terminal). The resistor tap is connected to the “plus” of the power supply. By turning the shaft by hand, pulses can be observed at terminal 2. There are six pulses per revolution.

Mechanics

The following diagram shows exactly how the speed sensor is designed.

Speed sensor for VAZ-2112

2110-3843010-13 – sensor;
2110-3843010-18 – sensor;
2108-3802820-10 – speedometer drive;
2101-3802718 – gasket;
2108-3802822 – drive housing;
2108-3802830 – sealing ring;
2108-3802834-20 – driven gear;
2108-3802833-20 – drive gear;
2101-3802717 – washer;
15896211 – M6 nut;
12601271 – wavy washer;
11500121 – pin M6x14.

Elements 1 and 2 are interchangeable.

Dismantling

To remove the sensor from the car, you need to disconnect its connector. The sensor housing is fixed near the CV joint - the desired point is shown by an arrow.

First step in dismantling

When the connector is disconnected, take a flat key “22” and unscrew the plastic nut. Then you can change the sensor or repair it.

What you need here is a flat key

To replace the sensor drive, use a “10” key to unscrew the M6 nut and remove it together with the washer. The drive housing is rocked from side to side - you need a 14mm spanner.

Dashboard connectors and speedometer contacts

The dashboard, as well as the speedometer on the VAZ-2112, may not work when they are disconnected from ground or power. Be aware that the speedometer receives power separately from the instrument panel. This also applies to the “mass”. Wiring:

X2-2: +12V for speedometer;
X2-3: speedometer “ground”;
X1-9, X1-10: power supply for tidy;
X1-1: “mass” of the tidy.

Connector X2 is painted red, X1 – white. Terminals 8 and 9 in connector X2 are the speedometer output and input. The output is connected to the on-board computer.

Both terminals (X1-9 and X2-2) are connected to one wire - orange. This line is protected by a fuse installed in the main mounting block (F19).

How to remove the tidy

First, disconnect the negative terminal of the battery. Then use a screwdriver to unscrew the 4 screws (photos 1 and 2) to remove the frame with glass.

Removing the dashboard

In the second step, unscrew the two screws holding the dashboard in place (photo 3). Next, compress the petal brackets to remove the tidy completely.

If you connect the battery and turn on the ignition, the orange cord (connectors X1 and X2) should receive voltage “+12”;
The presence of “ground” at terminal X2-2 is also a very important indicator;
The gray cord (terminal X2-9) is usually called “+12”, and in rare cases - “ground”. When moving, pulses should appear at this terminal.

Sometimes they do this: they make a tap from terminal 9, and, without engaging the gear, move (push) the car. The engine remains switched off. Pulses will appear on the tap, detectable even with a voltmeter. The voltmeter itself must be a pointer type.

It will not be possible to fix a faulty speedometer - it will be easier to replace it. But first you need to find out exactly what the problem was.

How to check the speed sensor for functionality

Symptoms of defects in this device are as follows:

suspension of engine operation during translational movement in idle mode and incorrect speedometer values being presented at the same time;
When defects are detected in the electrical circuit of the speed sensor, the price of which is quite reasonable, the light banner “CHECK” is displayed with parallel recording of the error code “24” in RAM.

Important: such a recording is also possible in case of defects in the operation of the mass air flow sensor, but since the “CHECK” banner in this version is not constantly displayed, it is possible that this difference will indirectly indicate which device failed in operation

The “CHECK” banner in this version is not constantly displayed, then perhaps this difference will indirectly indicate which device has failed in operation.

Mechanics

The following diagram shows exactly how the speed sensor is designed.

Speed sensor for VAZ-2112

2110-3843010-13 – sensor;
2110-3843010-18 – sensor;
2108-3802820-10 – speedometer drive;
2101-3802718 – gasket;
2108-3802822 – drive housing;
2108-3802830 – sealing ring;
2108-3802834-20 – driven gear;
2108-3802833-20 – drive gear;
2101-3802717 – washer;
15896211 – M6 nut;
12601271 – wavy washer;
11500121 – pin M6x14.

Elements 1 and 2 are interchangeable.

Dismantling

To remove the sensor from the car, you need to disconnect its connector. The sensor housing is fixed near the CV joint - the desired point is shown by an arrow.

First step in dismantling

When the connector is disconnected, take a flat key “22” and unscrew the plastic nut. Then you can change the sensor or repair it.

What you need here is a flat key

To replace the sensor drive, use a “10” key to unscrew the M6 nut and remove it together with the washer. The drive housing is rocked from side to side - you need a 14mm spanner.

Video on the topic

Good publicity

Home » Repair » VAZ 2110 – 2112 » The speed sensor (DS) is designed to obtain information about the number of revolutions transmitted from the gearbox to the drive wheels of the vehicle, followed by its conversion into an electronic signal and transmission to the electronic control unit (ECU). Only fuel-injected cars are equipped with DS. The predecessor of the speed sensor was a mechanical speedometer drive, which was equipped with all carburetor engines.

VAZ 2110 cars, depending on the year of manufacture, are equipped with different types of speed sensors. Older models are equipped with a mechanically driven sensor (rod and gear), new ones (after 2006) have a fully electronic design.

Electronic speed sensor

How to remove the tidy

First, disconnect the negative terminal of the battery. Then use a screwdriver to unscrew the 4 screws (photos 1 and 2) to remove the frame with glass.

None A little test:

If you connect the battery and turn on the ignition, the orange cord (connectors X1 and X2) should receive voltage “+12”;
The presence of “ground” at terminal X2-2 is also a very important indicator;
The gray cord (terminal X2-9) is usually called “+12”, and in rare cases - “ground”. When moving, pulses should appear at this terminal.