VAZ 21124 speedometer does not work

Often, car enthusiasts are faced with a breakdown of the speed display device. This creates additional difficulties in driving the car, especially if there are restrictions on the road, which can lead to an emergency situation. If the VAZ-2110 speedometer does not work, then you can fix the problem yourself or contact a car service center. No special skills are required for this. To repair a speedometer kit, you will need a car electrical circuit, auto tester or test lamp.

Purpose and principle of operation of the speedometer

The car speed meter kit consists of a speed sensor (DS), connecting wires, a mains fuse and an indicating device. On the “tens”, a dial speedometer is installed. It is located on the dashboard and is made in a single unit with other instruments and indicators. When the car is moving, the speedometer needle shows the true speed, and the odometer records the distance traveled. Readings are displayed either on the LCD display or on the drum counter.

On VAZ-2110 cars of the first production, a mechanical speedometer drive was used, made in the form of a cable in a metal braid with tetrahedrons on both sides. For fastening to the device and the drive device there were special union nuts. The torque from the secondary shaft of the gearbox was transmitted directly to the indicating device via a cable.

The VAZ-2110 electronic speedometer is installed on models with injection engines.

The operating principle of the device is based on the Hall effect. The signal from the DS is transmitted to the electronic control unit (ECU) and, converted, enters the input of the speedometer circuit. In addition, it is involved in the ignition system and fuel supply to the injectors. DS is an asynchronous generator excited by permanent magnets. The signal enters the ECU in the form of electrical impulses proportional to the speed of the vehicle. For example, while a car travels a distance of 1 km, about 6 thousand of them enter the control unit.

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.

Signs and causes of DS problems

VAZ “tens” are equipped with pointer indicating devices, i.e. the speed is judged by the angle of its deflection. If, while driving, the speedometer needle jumps and jumps, lies at “zero” or shows values that do not correspond to the true ones, and the odometer does not record the distance traveled, then this indicates a breakdown of the DS.

This situation occurs due to contamination of the sensor contact block, since the primary device is located on the gearbox housing under the hood and is not protected from dirt. The pad may be exposed to oil vapors penetrating through damaged seals. This leads to loss of contact and, as a result, incorrect speedometer readings. Such a breakdown can occur both with sensors with a square connector and with a round one. The difference between them is that the former are used in Bosh systems, and the latter in January 4 and GM.

When the speed sensor fails, unstable engine idling is often observed, and fuel consumption also increases. In this case, the DS is replaced. When choosing a working sensor, it is advisable to choose a model that is identical to the old one. Preference is given to products whose pinouts are indicated in the form of “-”, “A” and “+” rather than a digital designation. This will help when repairing the device and measuring the output signal.

The DS drive rod must be metal, not plastic. Otherwise, the service life will be no more than six months. When purchasing a working device, check that it is complete, that there are no backlashes, and that there is a washer on the rod. Replacing the DS is carried out independently and does not cause any difficulties.

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.

Speedometer Troubleshooting Options

Failure of the speed sensor is not the only reason for the lack of speedometer readings. The performance of the latter can be affected by a break in the connecting wires or a lack of contact in the terminal block, as well as a breakdown of the indicating device. If, when checking the DS, it turns out to be serviceable, then the search for the defect continues from the block to the speedometer. To ensure the integrity of the line and check the device for functionality, you need to use a test lamp.

To do this, one control wire is connected to the negative terminal of the battery and the ignition is turned on, and the other wire is often touched to contact “A” of the block, creating a kind of impulse. In this case, the speedometer needle should deviate from its original position. If the effect is achieved, then this section of the kit is serviceable, otherwise they begin checking the integrity of the circuit from the block to the fuse and then to the device. If the result is negative, we can talk about a device malfunction.

Replacing the speedometer is carried out with the instrument panel, since the industry does not produce spare parts for its repair. According to statistics, only in 7% of such malfunctions the inoperative element is the indicating device. If the speedometer kit is operational, but signs of malfunction remain, then most likely the drive gear located in the gearbox has broken down. It is recommended that such repairs be carried out at a service station, since it is necessary to dismantle the gearbox and disassemble it.

On the “dozens” of the first releases, speedometer problems can arise as a result of a broken drive cable or if the edges of the tip are “licked”. In this case, the cable is dismantled and replaced with a working one. If the speedometer drive socket is damaged, it must also be replaced.

To maintain the operating condition of the cable, it is necessary to periodically lubricate it and check the reliability of fastening to the drive. It must be remembered that it does not allow bends, creases and the formation of loops.

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.

Replacement of different types of DS VAZ 2110

Replacing the “ten” speed sensor will not be difficult for a car enthusiast and will take very little time. To do this, you need to perform a series of operations sequentially. Work begins with completely de-energizing the vehicle by disconnecting the negative terminal from the battery. After this, the latch is removed and the block is disconnected from the DS. The wires are moved to the side and fixed so that there is no break near the block.

Then, using a 22 or 21 key (depending on the type of sensor), unscrew it from the speedometer drive. If it is necessary to replace the device, then it must be unscrewed with a 10mm wrench and carefully removed from the gearbox housing. If the actuator rod falls into the gearbox, complete disassembly will be necessary.

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.

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 - pad;
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.

Installation requirements: on the one hand, it is necessary to obtain a tight seal, on the other hand, the plastic must not be broken.

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 to the speedometer;
X2-3 : speedometer “mass”;
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.

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.

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.

Video with instructions for replacing the sensor

Please tell me why the speedometer of the VAZ 21124 euro panel does not work. The sensor was changed. The speedometer on the VAZ 2112 does not work.

23 comments on “The speedometer on the VAZ 2112 does not work. Please tell me why the speedometer on the VAZ 21124 euro panel does not work”

You need to look, maybe you got a defective sensor, or maybe the breakdown is not in the sensor but in the box...

Either it was not connected completely or moisture got in there.

where is the admin?? why can't you post the recording??

Does the tachometer work?

MB the tidy is covered, the wiring is broken

Look at the drive, maybe it’s worn out?

Either the sensor is defective or the wire may be broken or the contact in the chip is bad

Maybe the misogyny itself is on the tidy which

I haven't tried the car

It's easier to change the car))))

Denis, the tachometer is working

Sultan, So the problem is either in the sensor or in the connection.

Everything works except the speedometer. I did somodiagnostics, all the tracks are running but the spedak is lying

The sensor is new

Sultan, I have such a hat. In the box there is a gear on a sleeve; the sensor reads the revolutions from this gear and transmits it to the panel. So, this bushing broke, but the gear (it’s plastic) remained in the box. No one believed in me that I would get it out of the box, but I did it) good luck!) This is what it looks like and how it broke!

Author, I have the same crap, the speedometer needle went down and the check light came on, if you understand what the problem is, please let me know))

Sasha, how to deliver?

Sultan, first make sure that it is broken. And so, I pulled it out with tweezers, then with a medical clamp. I've been fucking for about an hour

Sasha, I'll check the wiring first. And then I'll take your advice

It didn’t close anywhere, if it did, look at the brightness control of the instrument panel, there is a spiral there and at the end of this spiral (I don’t know what to call it) there is a soldered contact, it could come off, I had such a problem after the short circuit. Also 2112. I replaced it and all the indicators started working. My tachometer and speedometer did not work.

Sultan, we need to completely change the tidy, I had this happen on a one-year-old car.

The sensor drive shaft may be faulty, the plastic gear on it and the teeth have been eaten away. Just be careful when removing it, don’t drop it in the box

Don’t change the panel right away, ask your friends for a working panel and check.

Expert recommendations

Some expert recommendations regarding diagnostics and repair of speakers:

Diagnosis of the cause of unit failure should begin with a visual inspection of the speed sensor, as well as the wiring connected to it. As practice shows, the reason often lies in a broken wiring, in particular, in the place next to the plug.
If the controller is covered with dust or oil, you need to dismantle it and wipe it thoroughly. Then you can put the sensor in place and try to check the performance of the speaker. There is a possibility that after these steps the speaker will operate normally.
Under no circumstances should you drive with a non-working speaker, so if problems are found in its operation and you cannot check it yourself, you need to seek help from a specialist.

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