Any car existing in the world is necessarily equipped with a special system designed to measure vehicle speed and transmitting this information on the ECU. The carburetor vehicles use a cable (mechanical) Speedometer system, as a result of which the speed sensor is not required here. Therefore, on VAZ 2110, 2111 and 2112, it is mounted only on injection cars - this system is electronic and is responsible for managing the work of the power unit. Replacing the speed sensor - the event is quite time consuming, but not at all difficult. About this further in the article.

Where is the speed sensor and why it is needed

Purpose of this device - "Removing the angle of ahead of the ignition, control over the quality of the fuel mixture and the correct fuel supply. The sensor collects a mass of information for the injection motor, such as motor turnover, detonation level, speed and so on, and transmits digital signals to the electronic unit. In turn, this data is checked here and appropriate adjustments are made to the operation of the injector. As a rule, the speed sensor is located under the hood, in the motor compartment, near the exhaust manifold.

Signs Speed \u200b\u200bSensor Fault

If the odometer suddenly refuses to work, and the speedometer "lying" relative to kilometer and speed or works by jerks - this indicates the incorrect operation of the speed sensor or drive. Also possible problems in electrocopy, the pinout is confused, brings the connector and so on. In addition, the speed sensor malfunction can also be the fact that the vehicle stalls at idle, but this may be the mass of other reasons. Of course, if the speedometer gives obviously false testimony, and the "Check Engine" lamp burns on the instrument panel, then the reason is the failed speed sensor.

Diagnostics Speed \u200b\u200bSensor

The first method of diagnosing speed sensor:

1. Remove the sensor.
2. We determine which sensor terminal for what is responsible (a speed sensor is only three terminals - a pulse signal, voltage, ground).
3. The pulse signal terminal is connected to the incoming contact of the voltmeter, and the second voltmeter contact is ground to the metal part of the motor or the vehicle body.
   
4. When the speed sensor is rotated (for this, throw a piece of tube on the sensor axis), the voltage in the voltmeter should rise.

The second method of diagnosing speed sensor:

1. We subdominate the car - one wheel, while, should not touch the Earth.
2. Connect with the sensor the contacts of the voltmeter in the same way as described above.
   
3. Cool the raised wheel and follow the change in voltage.

Please note that these verification methods are suitable only for speed sensors using the Hall effect in their work.

Sensor controller, how to purchase a new controller to pay attention to when buying

When choosing a new speed sensor, pay attention to the following points: It is desirable that the connectors inside the blocks have notation - "-", "a", "+", instead of the standard "1," 2 "," 3 ". In fact, it has no fundamental importance, but the pinout will be carried out faster and, most importantly, correctly.

Another important point is to prefer the device with a metal rod, because it will last for more than six months, "released" plastic. Be sure to check whether the rod was equipped with a puck, as it rotates and does it have a backlash.

Tools, appliances and consumables

1. Keys on "21" and "22".
2. Transmission oil.
3. New controller.

Preparatory work, how to get to the controller and replace it with a new

1. Develop a car, removing a minus connector with a battery.
   
2. Disconnect the wire connector from the speed sensor. Be sure to remember what their pinout is.
3. We unscrew the sensor with your hand. If it does not work, use the key to "21" either to "22" (there may be differences in the design).
   
4. At the same time check the condition of the drive. After dismantling the sensor, we unscrew the nut with which the drive is attached to the gearbox. It is necessary to extract extremely gently, because dropping the rod into the box, it will have to disassemble it too. The new drive has a rubber ring. Before mounting it is lubricated with transmission oil.
   
5. Installation produce in the reverse order.

Wiring pinout, to pay special attention to using the multimeter

We draw attention to the pinout inside the pad. When the ignition is turned on, you determine to which connector is connected to which connector. If you have connected the wire to the plus connector, and the multimeter shows "minus", then it should be urgently changed polarity. Therefore, it is advisable to take a block with the appropriate notation. But if this did not turn out, you can take the usual one. In this case, the pinout is the following - 1 - this is "+", 2 is the "signal output, and 3 is" - ".

Tips Prof.

At the last stage, do not forget to check the drive, as well as the work of the vehicle as a whole when the wheels are hung or during the movement of the car.