Harmonious work of the internal combustion engineIt is possible only if all the parts and mechanisms that make up it are in good order. For this purpose the car is supplied with various sensors and subsystems, among which the idle speed sensor deserves special attention. What is this detail and what importance does it represent for domestic VAZ models? You will find answers to these questions in the course of our today's article.

Purpose and construction

The sensor of idling (VAZ "Injector" 1.6) is a device that monitors the idle speed of the engine. With its help, the internal combustion engine can maintain optimal operating conditions, thereby increasing the service life of all its components.
In addition, the idle speed can warm upengine to operating temperature in a cold period of time. Thus, the sensor of idling (VAZ 2110 including) plays far from the last role in the engine ICE. By the way, it consists of only three components:

1. Spring.
2. Stepper motor.
3. Stock with a cone needle at the end.

A more detailed design of this element is shown in the picture below:

As you can see, the structure of the DXH is very simple, so, with the repair and replacement of this device can be handled personally.

Where is the VAZ 2107 idle sensor located?

On cars of family VAZ the sensor of idling moves is located on the case of a throttle knot, near to the mechanism of position throttle заслонки. It is fixed by two cogs.

Principle of operation

The essence of the idle speed sensor isThe opening and closing of the canal, which runs around the damper. When the engine is running, the crankshaft speed sensor tells the controller (the information is often transmitted using special marks) about the speed of the part.

In turn, the controller decides:close or open the valve. In doing so, it is guided by various calculations and algorithms. Next, the idle sensor receives the command to be executed. Thus, by extending / pulling the rod with the needle, a reduction or increase in the fuel delivery to the engine occurs.

Symptoms of malfunctions

The following symptoms can indicate the malfunction of the idle sensor:

• "Floating" engine speed at idle.
• Poor start-up of internal combustion engine even when the accelerator pedal is depressed. Often this is the reason that the sensor needle covers the channel.
• When the vehicle warms up, the engine speed does not increase.
• Sudden stop of engine operation on neutral gear.
• A noticeable drop in turnover after the inclusion of energy users such as a stove, air conditioning, lights and radio tape recorder.

Listing the symptoms of a sensor failureidling, it should be noted that similar "symptoms" can be provoked by other devices (for example, fuel filter or candles) that are associated with the fuel supply system. Therefore, before changing the sensor of idling, the VAZ 2110 must be diagnosed for the serviceability of a number of other important parts. Only after making sure of the malfunction of DXH, you can begin to replace it. Otherwise, all work will not bring the desired result.

Check for serviceability

How to check the VAZ 2110 idle speed sensorserviceability? First, you need to find the mechanism itself and draw a wire harness from it. If your car is equipped with a 1.6-liter VAZ engine, unscrew the 2 fastening elements of the throttle assembly and remove it from the end of the receiver by 10 millimeters.

Further we carry out the sensor circuit and look, it is suitableIs there any tension to it. For this purpose, a conventional voltmeter is used. To determine the voltage, first connect the negative terminal to the ground and connect the "A" and "D" wires to the terminal block (they are often indicated on the terminal block). Now turn on the ignition and look at the voltmeter: if the voltage on the scale is less than 12 volts, you probably have a low battery. If there are no signs of current supply, the whole circuit or the electronic control unit is faulty.

If the voltmeter showed a voltage of 12 volts andmore, we continue the experiment. Turn off the ignition and begin to check the idle speed sensor VAZ 2110. The tester terminals are connected to the terminals A, B, C and D. At the same time, the total resistance should fluctuate around 50-55 Ohm. After that it is necessary to measure the resistance in pairs - its values ​​should be infinitely large. If the idle sensor (VAZ 21214, for example) gives out other indications, then it is defective, and it must be replaced. If the values ​​correspond to the norm, most likely the problem lies in the candles or other elements of the car. In this case, you need to go to the service station for diagnostics.

How to check DXH for serviceability? Method No. 2

You can use an alternative method.To do this, remove the idle sensor completely and connect the shoe to it. Further, slightly pressing a finger on the tip of the needle DXH, we check how far it moved out. Ideally, a working sensor at the time the ignition is turned off fully extends this element. Thus, your finger should feel a slight push. If this does not happen, then the device is in a faulty condition and must be replaced. But DXH can be restored, but this is a little later.

How to replace the sensor of idling (VAZ 2109-2115) with your own hands?

Before you start work, you first needde-energize the vehicle's on-board system. To do this, remove the negative terminal with the battery. Next, the connector with wires leading to the sensor from the throttle body is disconnected. You need to press your finger on the plastic latch-lock.

After the two fixing screws are removed, andthe sensor is removed from the nozzle. Sometimes there may be problems - the screw that is located next to the receiver, can fall out when unscrewed. To avoid this, it is recommended first to remove the left attachment mechanism, then unscrew the right one. In the next step, pull the sensor slightly toward you and unscrew the right screw. Thanks to this consistency, you will not lose the fasteners and significantly accelerate the process of dismantling.

So, the old sensor was successfully removed from the car.Now it is necessary to install a new one in its place. In general, the installation of DXH is carried out in the same way as removal, only in the reverse order. However, before working, experts recommend applying a few drops of engine oil to the O-ring. Doing this is not necessary, but by doing so, you will greatly simplify the work of installing the sensor on your car.

Calibration of the mechanism

Now you can proceed to the final stage -calibration of DCM. On all domestic cars, this procedure is fully automated, so all you need to do is put on a minus terminal, turn the ignition on for 5-10 seconds and turn it off again. Everything, on this calibration of the sensor has been successfully completed. The car is fully operational.

How to repair the idle sensor?

In some cases, in order to restorethis part, it is enough to clean it thoroughly. The very same cleaning of the sensor - the process is very easy, and for repair it is enough to have only one tool WD-40.

So, how to restore the sensor of idlingVAZ 2112? The first stage unscrews the two nuts of the throttle assembly. The latter, like in the case of replacement, is taken away by 10 millimeters to the side. The terminal block then disconnects from the sensor. Wadding stick WD-40 is applied, and with it all channels are thoroughly cleaned. Then, using a Phillips screwdriver, two bolts are loosened that fix the VAZ 2110 idle speed sensor. If there are no fasteners, then you have to remove the entire throttle assembly. Then the mechanism is pulled out. If it is covered with oil and black mud, then, apart from cleaning DXH, it will also be necessary to clean the entire throttle.

Next, the WD-40 is applied to a conical needle withspring. Thus, after a few minutes the sensor mechanisms will be cleaned of dirt. Then the device is dried, and it can be safely put in place. Before installation, the distance from the needle to the body of the device (one should be 23 millimeters) is checked. At this stage, the VAZ 2115 idle speed sensor can be considered successfully repaired. The machine can again work in the normal order.

So, we found out how the idle speed sensor VAZ 2114 is arranged (and other models). And the way it can be replaced / restored.