Speed sensor VAZ-2114: replacement and diagnosis with their hands

The VAZ-2114 speed sensor is very important. It is the adjustment of the composition of the fuel mixture and ignition timing. And with power steering – enabling and disabling of this mechanism.

For gasoline cars used a cable actuated system transmission speed data. In the injection machines are used as the sensors which generate an electrical signal required for submission to the speedometer and the engine control unit.

How is the sensor?

The first sensors that were installed on injection cars, mounted in the dashboard. Speedometer drive was carried out still by means of mechanical transmission of rotation. It is very inconvenient, as still the whole system continued to operate mechanical devices. Much better was the sensors of the second generation.

There was no longer a mechanical transmission, but there was one flaw — a connection with a manual transmission was made via the gear. She was very unreliable, often out of order. In the third generation sensors used devices on the Hall effect. They are more reliable and durable than the predecessors. Set the speed sensor, VAZ-2114 directly to the transmission.

Responsible For what speed sensor?

This device is necessary in order to ensure the normal operation of the engine in various operation modes. The connection of the speed sensor, VAZ-2114 are connected to the electronic microcontroller control unit and speedometer. Good sensor produces a signal, and its value depends on the speed of the car.

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In this case, the electronic control unit allows to ensure the normal operation of the actuators, in particular, IAC. All electronic devices need timely inspection and health monitoring. If you have no working speedometer, it does not mean that the faulty speed sensor. Be sure to check the operability of the speedometer. It is possible that the failure lies in it.

How to determine that a faulty sensor

If your car is equipped with on-Board computer, the electronic control unit will generate an error that will appear on the display. There are two mistakes:

1. Р0503 — the signal from the speed sensor is interrupted. It is possible that the reason for this behavior – poor contact in the connecting wires.
2. Р0500 — the signal from the speed sensor there at all. In this case, there may be a breakdown, and the wire that connects the sensor with the electronic control unit.

Be Sure before replacing the sensor, make sure that all the wires that it is connected to the system are in good condition.

External signs of failure

Also you may notice the following signs, which are typical in case of malfunction in speed sensor:

1. Significantly reduced engine power.
2. Increases gas mileage, and noticeable.
3. Rpm when the engine is idling unstable. Sometimes the engine stalls, if you don't press the gas pedal.
4. Speedometer does not work or operates erratically.

All of these symptoms can not be attributed unambiguously to the speed sensor. Because these symptoms and in case of failure of other devices and Executive mechanisms.

Diagnosis sensor

Perform the diagnosis in several ways. If you suspect breakage sensor VAZ-2114, you must apply voltage to the device, and the output connected to the multimeter. Rotating the axis of the sensor at different speeds, observe the voltage change. The higher the speed, the greater the voltage.

If you don't want to disassemble the sensor, you can use Jack to lift one wheel. Enable a fifth speed and gradually speed up the wheel. If the voltage increases gradually, then the instrument is in good condition. But much better will be the diagnosis by installing a known good sensor.

Replacement

To Perform the replacement speed sensor, VAZ-2114 can be very fast, it is better to use a viewing hole or overpass. The procedure of execution of works the following:

1. Disconnect battery negative terminal.
2. Clean the entire surface around the sensor on the transmission.
3. Disconnect the connector by depressing the retainer.
4. Remove the sensor by rotating it counterclockwise. For disassembly you can use the key on “21”.

If there is a breakage in the drive, it must be pulled. To do this, Unscrew the key on “10” nut. Carefully remove the actuator, carefully ensure that the inside boxes have not fallen stock. If necessary replace the o-ring. If the faulty stock, be sure to install the new and reassemble the actuator. New speed sensor needs to be installed, spinning it clockwise. Then connect the wires and test.