Often, electric circuits drivers practicallydo not pay due attention. Wires from the moment of purchase of the car almost never change. As a rule, this is not necessary, as long as everything works. But sooner or later there comes a time when the wiring starts to pour. The arrow of the speedometer twitches, the instrument panel lights are floundering, etc. All this is solved, so let's deal with this issue in more detail.
What do you need to know?
Often, the problem with the speedometer refers toelectronic malfunctions. Although much depends on the car. For example, if the arrow of the VAZ-2107 speedometer twitches, then it's not necessarily the case in the wiring. The speedometer in this car is of a mechanical type, there is at least a minimum of wires. Therefore, very often the problem is a cable that has lost tension.
At the same time, the case may be in defectivespeed sensor. Many motorists test its performance first. It's much easier than dismantling the dashboard, repairing the malfunction and reassembling it. Let's look at the same in more detail with the main malfunctions of speedometers on some brands of cars and consider methods for their elimination.
Problem with the speed sensor
In order to understand the question of how,why the needle of the speedometer jerks, it is necessary to become more familiar with the design of the car. For example, the domestic classics did not have a speed sensor. The system worked like this. At the checkpoint was located the motor (drive), which, during the car's movement, twisted a cable going to the speedometer.
If the motor was out of order, then on the panelthe arrow at all "died" and always showed "0". But most modern cars are equipped with a speed sensor, which is installed in the gearbox. It practically without error determines the speed mode and transmits data to the speedometer by means of wires. From the same wire and sensor, the data also come about the distance traveled, that is, to the odometer.
Typical malfunctions
Talk about the reliability or unreliability of thissensor is not necessary. On some cars, it works during the entire lifetime, but on others it often breaks down. Nevertheless, there are a number of typical problems that motorists face:
- Failure due to old age. Every electronic device, regardless of quality, has its own resource. Therefore, it can fail at any time.
- Mechanical effect. Simply put, damage to the sensor housing or wiring. If any work was done to remove and install the sensor, it is likely to damage it.
- Oxidized, parched or broken wires. Also, the trunk works out its own, if it has not changed for a long time.
- The sensor does not fit the given model of the car. In this case, do not rely on correct readings of the speedometer.
Troubleshooting methods
Usually the working capacity of control devicescan be restored by replacing the speed sensor. As an example, consider the car "Hyundai Accent". The arrow of the speedometer twitches - we go to buy a new speed sensor in the store. With a large mileage of this brand of cars, this is quite a typical problem for him, which many motorists face. If the box is mechanical, then the problem is most often solved by replacing the cable. Lubrication with VD-40 also helps, but this is more of a temporary solution, so in the future the problem can return.
As for the automatic transmission, there are installedsensors that often fail. Change them will not be difficult. Let's see how to do it and what we need to do the work.
Replacing the speed sensor
If the arrow of the VAZ-2107 speedometer twitches, thenit is necessary to replace the cable or worn out gears, whose faces have already worn out during the operation of the car. This rule is practical for all cars that are equipped with manual gearbox. The speed sensor is installed in the automatic box. Let's look at the example of "Accent" consider the replacement process.
For the work we need to buyThe original speed sensors cost 800-900 rubles apiece. The tool needs a key on the 10 and 12, as well as the corresponding heads. There are two sensors in total. The first is located on top of the box, the second is on the bottom. To get to the top, you need to dismantle the air filter box and remove the battery with the platform. After that, use the key for 10 to unscrew the old one and install a new one. The lower sensor is behind the left wheel. To get to it, you need to remove the protection of the box and the front part of the fender cover.
Wrong wiring
Как уже было отмечено выше, провода со временем oxidize, bend and just crumble. In the end, this leads to the fact that the contact completely lost, which before it appeared, then disappeared, which led to an incorrect operation of the speedometer.
This problem can be solved in several ways.The simplest is to solder the wires and put them on a heat shrink. The problem may arise elsewhere, but this may not happen. The second method is to replace the entire braid. A more laborious and complex method, but as a result - the normal operation of the wiring for a long time. Also it is necessary to understand that if the wire is bare, it can shorten by weight. In this, too, there is nothing good, so if you noticed this, then it's worth trying to fix the problem as soon as possible.
The arrow of the speedometer VAZ-2109 is twitching
Зачастую для устранения проблемы потребуется dismantling of the instrument panel. It takes a long time, although almost everyone will cope with this task. To perform the dismantling, you need to get the radio and cigarette lighter, emergency lamp and unscrew all the necessary fasteners. Now you can proceed with immediate repair.
If the needle of the speedometer twitches when typingspeed, then, most likely, the case in the drive, which broke down. Therefore, you need to remove the drive, gears, and seals. The latter must be replaced with new ones. Next it is desirable to carry out the defect of the gears. If the faces are lapped on them, then we change them.
Помимо этого, желательно проверить тросик.It is likely that it touches something during the ride, which causes the jumps of the arrow of the speedometer. If necessary, replace and lubricate the cable. Then we perform the assembly.
Atypical breakdowns
If the arrow of the speedometer twitches (2109 is a VAZor another model - it's not important, a breakdown of this type is inherent in many cars), and the above method did not help, that is, several more options. One of them is the jamming of the arrow in a certain position. Therefore, when dialing speed devices can display normally, but at some point there will be a jump. Solve the problem by disassembling the instrument panel and repairing the speedometer. It is likely that you will need to remove the arrow and lubricate it or change it to a new one.
Another atypical failure is failuregear after twisting the run on a mechanical speedometer. It occurs very rarely and says that the masters correcting the run were not too mean with the car. But on the electronic speedometer when twisting the run, the system can be locked, and the "Chek Engin" error appears on the dashboard. Lastly, it is worth looking at the on-board computer, but this only applies to electronic systems.
How to replace the cable
Over time, the cable rots and graduallystarts to fail. At first, the problem manifests itself in the fact that the arrows of the speedometer and tachometer are twitching. If nothing is done, the instruments will soon cease to show the vehicle’s speed and mileage altogether. To solve the problem, you need to drive the car to the pit. On the side of the engine compartment is the drive cable. Having disconnected the protective case, we unscrew it with the help of the ordinary open-end wrench. Now we can disconnect the wire.
It is advisable to pre-disassemble the paneldevices. This is due to the fact that after we disconnect the cable from the drive, it must be disconnected from the speedometer. Turn off the nut and remove the wire through the engine compartment. In this case, it is desirable to remember how it went, so that later there were no problems with its installation. At the VAZ-2109 installed two types of dashboards: low and high. Accordingly, the length of the cables is different, so when you buy with you, it is desirable to have a sample so as not to be mistaken.
Some important nuances
Here we are, in fact, figured out whytwitch speedometer arrow. As you can see, the reasons may be mass. But, faced with such a problem, it is not at all necessary to immediately go to the service station. The malfunction is often possible to eliminate on their own, of course, if you have the time and desire.
Oddly enough, with electronic systems in thiscase is much easier. In most cases, it all ends with a banal replacement of a speed sensor or wiring. Another thing is that this sensor for some cars is worth a lot of money. In this case, you can try to find a worthy analogue with the help of online directories. But frankly Chinese products, which attracts its low cost, it is better to ignore. After all, such a sensor may please the owner of the car with correct work for a short period of time, or even not at all to work immediately after installation.
Finally
The problem of mechanical speedometers most oftenis the critical wear of the underlying mechanisms. For example, under the influence of high humidity and salts, the cable rots. If at some point the speedometer stopped showing, then the case is clearly in the cable. In fact, the twitching arrow is not uncommon. Many motorists prefer not to pay attention to this problem at all and leave everything as it is. Much worse when they start to swim at idle.
As for some modern carsfamous brands, for example, "Mercedes" or "Audi", here it is sometimes difficult to do something on your own. In this case, it is still better to visit dealers or service stations. But to repair an old “Volkswagen” or VAZ will not be difficult even for a beginner. The main thing is to take a thorough approach to solving the problem and have a minimum of the necessary tools with you. In the most neglected cases, it makes sense to change the speedometer drive, but this applies only to mechanical options. This is similar to replacing a speed sensor, but is somewhat more complicated and expensive. That, in fact, is all you need to know about the problem and the methods of its elimination.
