The vehicle speed is a key parameter that needs to be constantly monitored. Exceeding the permissible speed is not only fraught with obtaining a fine, but may entail serious consequences. About this further in the article.

Speed \u200b\u200bsensor, device and principle

The purpose of the high-speed controller in carburetor and injection motors is to transfer information about the speed of the car on the instrument panel. The principle of operation of DS is quite simple and based on the effect of the hall:

1. The controller transmits voltage signals to the ECU with a frequency, directly proportional to the velocity of the wheels of the vehicle.
   
2. The computer, in accordance with the signals taken from DS, performs the operation of the engine at idle and using the XX sensor controls the air flow into the throttle bypass.
3. It is very important that the frequency of the controller pulses was directly proportional to the actual speed of movement.

Where is the speed sensor on the VAZ 2115

DS is located at the top of the PPC housing (see photo). But access to this controller is not so easy. To get to the device, you need to drive the car to the overpass or pit, and climb under the vehicle.

Malfunctions Speed \u200b\u200bSensor VAZ 2115

If the P0500 error appears during the diagnostics, it means that the speed sensor does not receive a signal. If you see the code P0503, then the incoming signal is interrupted for certain reasons.

Signs of malfunction at the VAZ Speed \u200b\u200bSensor 2115

• One of the most likely breakdown symptoms is incorrect values \u200b\u200bon the speedometer, in particular, the arrival of the dial is chaotic moving on various sides.
• Another sign - the engine runs on xx with interruptions.
• Floate speed on XX.
• Increase fuel consumption.
• Dips for overclocking, i.e. when the driver presses gas, the engine does not respond to it, the power set does not occur.

Causes of the failure of the VAZ Speed \u200b\u200bSensor 2115

• Open in the electrical circuit of the regulator.
• The device is not in contact with the on-board network.
• The mechanical drive of the device is faulty.
• Due to damage or wear, a sensitive controller element broke.

Diagnostics of speed sensor

The diagnosis of the sensor performance is performed by two methods.

To implement the first method, you will need a multimeter:

1. First of all, dismantle the controller itself. Read the removal instructions below.
2. Next, set the Tester to the variable voltage measurement mode.
3. The tops of the multimeter must be closed on the controller plug contacts. The first probe is connected to the contact to the dashboard, it is located in the center, and the other to the car body, i.e. to the mass.
   
4. Front controller is a special rod. When it rotates the device starts. To diagnose the operation of the regulator, you must scroll, for which a metal tube is installed on it.
5. The rod starts rotating, and information about alternating voltage will be displayed on the multimeter display, more precisely, its jumps. At the same time, the higher the speed of rotation of the rod, the largest jumps of the values. This will indicate the fault of the controller.

The second method of checking the device is performed without disassembling, but for this it is necessary to drive cars to a pit or a flight:

1. When the car is on the pit, raise the left front wheel to the jack.
2. Next, find the controller and disconnect the connected wiring from it.
3. Now take a multimeter. Its probes must be combined with the masses and the contact of the pulse transfer to the computer, on the block it is the central and most extreme contact.
   
4. Then rotate the wheel raised by the jack, and diagnose the values \u200b\u200bthat show the multimeter for the presence of voltage jumps. In the absence of a tester, you can apply a conventional test lamp with wire connected to it. Connect the first wire to the power, that is, to the left contact, and the other to the central one. If the lighting source is blinking when the wheel is rotated, it means DS is working.
   

It is possible that the reason for the breakdown of the DS lies in a bad contact with the electric network of the car, in this case it is necessary to simply replace or clean the contacts. Before diagnosing, inspect the device. If there are traces of damage on it, it may not even make sense to check it.

Tools, fixtures, consumables

1. Wrench on "21".
2. Screwdriver.
3. Rag.
4. New speed sensor.

Choosing a workplace

Works on the replacement of the speed sensor are performed on the overpass or observation pit.

How to remove the speed sensor VAZ 2115 (step by step)

1. First, turn off the ignition and open the hood.
2. To facilitate the removal procedure, dismantle the adsorber. To do this, simply unscrew the nuts that lock this node, then remove it to the side.
   
3. Next, hold down the mount and dismantle the wiring connector.
   
4. After performing these actions, proceed to dismantling the device. The device turns against a clockwise until the speed sensor is turned off completely. Using a wrench to "21", remove the sensor from the landing space.
   

How to put a new VAZ 2115 speed sensor (step by step)

1. Clean the location of the sensor from dirt and dust.
2. Then perform the installation of a new sensor. In this case, you should act carefully, since the controller housing is made of plastic, so that even insignificant mechanical effects are able to bring it out of order.
3. Next, build the sensor in the seat in such a way that its grooves coincide with the sleeves, otherwise you will not be able to fix the device reliably.
4. Tighten the sensor clockwise. No need to delay the device.

Tips Prof.

Detailed DC Replacement Instructions You can see in the next video.