The speedometer is called an important piece of vehicle that measures and shows the instantaneous speed of movement, as well as, calculates the distance that droves the car. This data shows a special sensor, which is located on the instrument panel. If this device is faulty, the life of passengers and the driver itself falls at risk, as to follow the rules of the road and the installed velocity mode by motorist will be difficult. It is about this that each driver should look after the technical condition of the speedometer and be able to timely and independently identify the cause of the fault and eliminate it.

Speedometer device

The presence of a speedometer is considered mandatory for each vehicle, as it not only helps determine the speed of the vehicle, and shows the distance that the car drove throughout its operation. The latest information shows the counting node, which is included in the set of speedometer, and refer to its odometer. With it, the driver can determine exactly at what point must be changed or, for example, filters. In addition, when purchasing a used car, such data are far from the last. Also, thanks to the odometer, you can learn intermediate information about a kilometer. With such a function, a motorist can calculate fuel consumption or damage the distance, for example, from home to work.

The correct determination of the speed depends on the main working elements - the flexible shaft and the drive cable. With their help, directly from the transmission is transmitted to the rotational motion device, in other words, they permeate the entire vehicle system, connecting the instrument panel and gearbox.

The principle of operation of the speedometer actually did not change over the century. For such a long time, changes occurred only in the indicator mechanism.

To date, there are two types of speedometers - electronic and mechanical.

The first of them is equipped with an electronic indicator, such as numbers on the display, and the second - mechanical, as an arrow. The magneto induction speedometer is the most popular among mechanical instruments. It is equipped with two mechanisms - countable and speed. As for the electronic speedometer, it looks outwardly, it does not differ from the mechanical version, there are only some differences in their work.

In modern cars, mechanical speedometers practically do not apply. In particular, due to the fact that their error is significantly more - 15%, when the electronic is only 5%. In addition, the mechanical drive and elements of such a speedometer are able to wear out over time and they have to change, which is a rather complex and time-consuming operation, as it is necessary to put the cable at exactly, without any inflection.

Speed \u200b\u200bsensor does not work, reasons

The most apparent sign of the speedometer is out of order - when the movement of its arrows is missing during the movement of the vehicle. In addition, the arrow can twitch, but the device will still not show adequate speed. There are a number of reasons that can cause problems in the speedometer:

1. If the nut went down, with the help of which the Speedometer shaft is attached to the flexible shaft. This is the most banal and common cause, due to which the speedometer may fail. The situation can be easily fixed, simply by twisting the nut and fastened securely. However, if this procedure did not give the desired result, you should look next.

2. If a flexible shaft was cut off during the work. This often occurs with long-term operation of the car, the part is capable of simply wear and burst. In this case, it will be much more difficult to eliminate the fault, but there is nothing no possible. The situation is solved by replacing the broken element.

3. If the speedometer mechanism itself broke, which is located on the dashboard. It is possible to eliminate such a breakdown by replacing the mechanism.

4. If the Slow shaft is the cable. In such a situation, it is necessary to make a lubricant of the selection shaft, which is the main component of the device. It is located in a special shell, which is placed in a polychlorvinyl tube. It does not allow moisture and lubrication to enter the mechanism, which is very important for the accurate and continuous operation of the flexible shaft. If the fluid dried, the device arrow will twitch, and the motorist will hear typical rustling.

5. In addition, the incorrect installation of a speedometer or its elements may cause such problems.

6. If the speedometer arrow rolls, but the positions of its own does not change during the stop, nor during the movement of the vehicle, this indicates a rupture of the opposing spring.

Speedometer cable drying, how to lubricate, work step in stages

In order to lubricate the cable, you will need such materials and tools:

1. Special consistent lubrication.

2. Wrench keys.

3. Screwdriver.

Getting to work:

1. For a start, it is necessary to open the hood and pull out the cable from the box - it will significantly facilitate the operation with the dashboard. The nest is located in the center of the engine compartment.

2. Next, you need to lower the steering wheel as low as possible and unscrew the two screws from the plastic part, which frame the dashboard.

3. Pull the element and unscrewing a few more screws.

4. Now pull out the niche directly the dashboard.

5. Disconnect the device, for which you need to unscrew the naked nuts on both sides.

6. Pull the flexible shaft in the direction of the drive, we break the ends of the support washer and remove it.

7. Detail of the shell must be pulled out in stages.

8. With kerosene, we remove the old lubricant, after which the details need to dry.

9. From the drive side, lubricate the element by 2 \\ 3 of its lengths.

10 Insert it into the shell, close the shock washer and mount it back.

11. Tighten the pressure nuts tightly.

12. The dashboard should also be installed in place.

Replacement of the speedometer, the course of work in stages

To replace the speedometer, it is necessary to unscrew and remove the dashboard in the order described above and then the speedometer itself. In fact, the independent replacement of the speedometer is a rather time-consuming process, but it is quite realistic to spend it at home. In fact, to replace the speedometer, it is necessary to simply disconnect electrical connectors from the old device and connect them to a new device. To do this, you need to unscrew the cable nut with pliers and connect to a new speedometer. In some cars, in particular - VAZ 2109, the speedometer cable to start is unscrewed from the gearbox. This connection is located near the gearbox, under the bottom of the car.

We unscrew the cable nut on the example of the VAZ 2109:

1. Enjoy the nuts to a special eye drying, a solid thread or a soft wire.

2. From the side of the gearbox from under the bottom, pull the cable on itself, so that the end of the wire remained in the cabin of the vehicle.

3. Delate the thread from the old cable and tie to the new one.

4. Then, you must draw it into the cabin and connect.

Sometimes, there are no eyes on non-original cables. In this case, instead we use directly nut. Whatever the shut-off washer is easier to insert, it should be lubricated by Litol.

Tips of professionals

In any case, the output of the speedometer is a rather serious breakdown, which cannot be allowed. It is important to know that if in a vehicle one mechanism is incorrectly functioning, it will soon be able to malfunction of the other. Not to mention the usual rules of the road, observe that, without having a speedometer, not everyone. Following the instructions described above, you can easily detect the cause of the fault and eliminate it without referring to specialists. However, it is worth considering the fact that for each automotive model there are features of both dismantling and installation of this instrument.