Constructions of modern cars provide a huge number of different electronic devices. One of these devices is the speed sensor, the main role of which is to obtain information that is transmitted from the gearbox to the front wheels of the vehicle, as well as the transmission of this information by the electronic control unit. The controller processes the data obtained and transmits them into the control panel, informing the driver about the distance traveled and the speed of movement. However, unfortunately, over time, the speed sensor is able to fail, which entails his diagnosis and subsequent replacement. How to independently replace the speed sensor without resorting to the help of specialists, read further in the article.

VAZ 2114 speed sensor device

On vehicles with carburetor engines, the principle of operation of the speedometer was quite simple, since the speedometer was mechanical. With the installation of injectionboxes and the need for accurate interaction of the set of parameters in order to ensure a combustible injection, the need for additional electronic sensors appeared, among which there is a speed sensor. The principle of action of the speedometer has also changed - he became electronic.

The first speed sensors installed on injection vehicles, which only appear, are no longer used. They combined the speedometer drive cable and an electric sensor. The second generation of sensors got rid of the speedometer cable, the latter was replaced by electric, however, such speed sensors had a weak place - a gear connection when installing on the manual transmission. The third generation is a pulse sensor, the principle of operation of which is based on the Hall effect.

VAZ 2114 speed sensor, where it is located and what functions performs

Think, where there is a VAZ 2114 speed sensor, it does not have long, because it performs the option of determining the speed of movement. It is worth noting that a constructively drive speedometer has saved its location, therefore, the speed sensor is on the gearbox from above, near the right shrus. From the bottom you can get the best access to the sensor, fir put a car on the observation pit.

What does the speed sensor affect? It is directly connected to the electronic speedometer and controller. In the healthy state, the speed sensor displays the required information about the current speed, maintains the motor turnover in optimal mode, ensures optimal operation of the XX controller through the production of adequate signals to the electronic control unit.

Since electronic devices are subject to different external influences, leading to failures in the system, prophylactic inspections should be systematically carried out and control their performance. So, there is an opinion that if the Speedometer of the VAZ 2114 does not work, then refused the speed sensor. But, there are special techniques for controlling the electric speedometer. With the help of special equipment on the stand, it is possible to determine its performance.

Symptoms of the VAZ 2114 speed sensor fault

In the process of operation of transport with the electronic on-board system, many car owners fell into a situation where the error section comes on with the other signal. Although it often happens that after turning off the motor and re-start, this signal is not manifested again, which sometimes causes distrust of the testimony of the ECU. In any case, each motorist must remember what errors indicating problems with speed sensor will light up on the onboard computer monitor:

1. P0503 is an intermittent DS signal.
2. P0500 - Lack of DS signal.

Indeed, quite often the cause of such signals is weakened contacts or even breaking the wire sensor wires. It should be taken into account where the DS is located on the VAZ 2114. The gearbox is experiencing a strong vibration during operation, so it is necessary to pay special attention to the prophylactic examination of this sensor.

In addition to the appearance of error signals on the onboard computer monitor, other features of the speed sensor fault may appear, namely:

1. Reduced motor power.
2. Significant increase in fuel consumption.
3. Unstable work or full non-working speedometer.
4. "Walking", unstable turns on XX, possibly spontaneous turning off the motor with a non-squeezed gas pedal.

Undoubtedly, these features are not a unambiguous diagnosis for speed sensor, other reasons may occur, for example, fuel system malfunction. But, check the condition of the speed sensor, is still necessary.

VAZ 2114 speed sensor, how to check the performance

There are a number of velocity sensor performance methods:

1. The first way. We dismantle the problem sensor. Using a voltmeter, we make the output voltage and signal frequency measurement. To do this, we wear plastic tubes on the signal axis and spin the housing to a speed of 3 to 5 kilometers per hour. The faster the sensor rotates, the higher the frequency and voltage.
2. The second way. Does not require a remant of the sensor. With the help of a jack raise the front wheel in such a way that it can be promoted. Connect a voltmeter to the sensor contacts. We spin the wheel and remove the testimony from the instrument. If the frequency and voltage grow adequately promotion, then the sensor is in order.
   
3. Third way. Implies diagnostics with the help of a light bulb or the "checkpie". The front wheel raise on the jack so that it can be twisted. First of all, we disconnect the pulse wire from the sensor. Turn on the ignition. "Check" we find "plus" and "minus". The "control" connect with the signal "signal", after which we spin the wheel. If the sensor works normally, "minus" should light up. In the absence of the control tool, use the light bulb, for which connect the wires to it. One wire is connected to a "plus" battery terminal, and the second to the "signal" output. Rotating the wheel. If the lamp blinks, then the sensor is working.
4. Fourth way. One wheel raise to the jack and dismantle the speed sensor. Sprinkle the sensor drive and rotate the wheel. If the drive is working normally, you will feel your fingers how it rotates. If there are no hots, the drive is in order.

Choosing a workplace

All the work on the replacement of the speed sensor is preferably carried out on the observation pit or the overpass.

Tools, fixtures, consumables

To replace the speed sensor, you will need tools and devices:

1. Rag.
2. Keys on "21", "14" and "10".
3. Directly the speed sensor itself.

Vaz 2114 speed sensor, purchase criteria for a new sensor

As for the speed sensor, it can be easily found at the catalog number - 2111-3843010. To date, its approximate cost is about 300 rubles. Experienced drivers recommend setting the sensor, the shank of which is made of metal. It is worth noting that for some models you have to change the connection connector.

Replacing the VAZ 2114 speed sensor do it yourself, step by step instructions

1. It is necessary to drive to the pit in advance so that the engine body has managed to cool. It is advisable to open the hood. So the motor will cool faster and the light will be much better. Do not forget to disconnect the battery.
2. Further we are looking for a speed sensor on the gearbox, with the help of a vein we clean the surface of the gearbox around the sensor and exempt the contacts by dismantling the block with wires. Do not forget to pre-press the spring retainer.
   
3. The sensor needs to be twisted counterclockwise. Take advantage of the key to "21", if you do not work with your fingers.
4. After dismantling the sensor, check the speed sensor drive. If the rod is broken, pull out the entire drive.
5. Unscrew the nut with the key to the "10" and pull it out with the washer.
6. Out the drive in the slot to the key to "14", then carefully pull out the drive. Watch that the rod does not fall inside the box, otherwise it will have to dismantle and disassemble.
7. Check the state of the sealing ring. If necessary, replace it.
8. Replacing the rod, set the drive.
9. Rotating a new speed sensor clockwise, carefully install it in the desired location.
   
10. When the sensor is screwed down, connect terminals to its contacts. The accuracy of the connection of the contacts should be checked, because due to such trifles the device will not work.

Tips Pros: Accuracy and attention Pledge of successful repair

Perform work follows with caution, since the speed sensor housing is made of plastic and it can be easily damaged during installation. This negative experience is available. All instructions warn about the mandatory observance of precautionary measures during the installation of the sensor so that later I did not have to go to the store for a new one.