Control of the operation of internal combustion enginescombustion of modern cars is carried out with the help of special electronic devices (controllers). One of the main tasks of the controller is the regulation of the composition of the fuel mixture supplied to the cylinders of the power unit. It depends on it fuel consumption, stability of the engine, as well as its power and traction properties. For this purpose, the electronic control unit collects and analyzes information coming from various sensors. Based on the received data, the ECU sends the necessary commands to the appropriate devices.
In this article we will talk about what the VAZ-2110 oxygen sensor is for and what it is intended for. Also we will consider its design, possible malfunctions and ways of diagnostics.
Oxygen sensor VAZ-2110 – это электронное устройство, предназначенное to determine the amount of pure oxygen in the exhaust gases. What is it for? First of all, in order to reduce the amount of harmful impurities contained in the exhaust gases. The maximum reduction in their concentration is possible only by creating a so-called stoichiometric fuel mixture (14.7 kg of air per 1 kg of fuel). To achieve this proportion, it is necessary to ensure the actual supply of air in the specified amount. It turns out this is not always, and for many different reasons. The ideal ratio of the amount of actually incoming air to the theoretical index is usually denoted by a Greek letter λ (lambda). This is why the oxygen sensor is also called a lambda probe.
Structurally oxygen sensor VAZ-2110, as, in principle, and other injectorcars, consists of two electrodes: external (platinum) and internal (zirconium). The first contact with the surrounding air, and the second - with the exhaust gases of the machine. The sensor readings are based on the potential difference between the electrodes: the larger it is, the less oxygen in the exhausts.
For normal operation of the lambda probe, it needs to warm up to 300-400 degrees Celsius. This temperature is achieved by a special electric heating element built into the sensor.
Сразу после запуска двигателя электронный блок control regulates the composition of the mixture, based on the readings of other sensors (mass airflow, opening of the damper, coolant temperature, etc.). When the lambda probe warms up and comes into operation, the controller begins to refer to its data as well.
In the first injector modifications VAZ-2110 was used standard oxygen sensor “Bosch” with marking 0 258 005 133. After 2004, when the “dozens” began to be equipped with new injection systems “January 7.2” and “Bosch M7.9.7”, manufacturers began to install upgraded lambda probe VAZ - 0 258 006 537. Its main difference from the previous modification was the ceramic heater, which consumed much less electricity, but heated the device much faster.
Сегодня фирма «Бош» выпускает семь различных modifications of lambda-probe power of 12 and 18 watts. In addition to the energy consumption indicators, these sensors are almost the same, except the number of contacts.
In cars VAZ-2110 the lambda probe can be placed in different ways. In older versions of the "dozen" it is attached to the upper part of the receiver tube (next to the resonator). In the new 1.6-liter engines oxygen sensor VAZ-2110 located directly on the exhaust manifold.
The latest modifications of the "dozen" are equipped with two lambda probes. First oxygen sensor VAZ-2110 (16 valves) installed before the catalyst, and the second - behind it.
On average, the VAZ lambda probe canconscientiously work for 5-7 years or 120-150 thousand kilometers. But this is subject to normal operation of the car, which excludes constant overload, low-quality fuel and off-road driving.
Basic malfunction of the oxygen sensor «десятки» – это критический перегрев, возникающий when using poor fuel, ingress of various process fluids into the device, deposition of carbon on the working elements, as well as natural wear and tear, which is not insured by any device.
Whatever it was, but if the lambda probe VAZout of order, it will have to either repair or change. But before proceeding with this work, you should make sure that it was the oxygen sensor that caused the engine to malfunction. First, consider the main symptoms of its failure. These include:
It is best to diagnose the lambda probeusing specialized equipment in the service center. Only this way it is possible to accurately determine its malfunction, as well as find out the reasons for which it failed.
At home, only approximate diagnostics can be carried out. And it will help to carry out a conventional multimeter, included in the voltmeter mode. Before how to check oxygen sensor, you need to warm upcar engine to operating temperature. Next, the motor needs to drown out and disconnect the probe connector. We connect the signal wire of the sensor to the plus probe of the multimeter. Negative contact of the device is attached to the "mass" of the car. We start the engine, load it up to 2500 rpm and look at the instrument readings. If the voltage value is close to 0.9 V, lambda probe VAZ OK and the cause should be found elsewhere. But if the voltmeter reading is below 0.8 V, most likely the sensor has failed.
Having determined the malfunction of the lambda probe, you can not bother with trying to repair it, and immediately get a new one. Naturally, if you do not confuse its cost. How much is the new oxygen sensor VAZ-2110? Price, depending on the modification of the probe, varies from 1,500 to 3,500 rubles. Expensive? Well, what did you want, platinum and zirconium - not cheap metals.
In some cases, a failed sensorcan try to recover. But this option is applicable only for those cases when the cause of its breakdown is deposits of carbon on the working elements of the device. Combustion products disrupt the normal operation of the lambda probe, distorting the output signal. In order to get rid of carbon on the working surfaces of the sensor, we will need:
First we disconnect the sensor connector andunscrew it from the seat. Now it needs to be cut, because the probe does not understand. Gently hold it in a vice and saw off both protective caps to get to the ceramic rod. When this is done, heat the sensor above the burner. This is necessary for the burning of soot. In no case should you try to remove the combustion products by mechanical means. So you only harm the device.
After heating procedures you can continuerestoration of the working elements of the sensor, placing it in orthophosphoric acid. It perfectly dissolves soot. But do not overdo it. Keeping the probe in acid is not recommended for more than 30 minutes.
Upon completion of the work, the sensor must be assembled. To do this, you need to solder the sawed caps to the body using a soldering iron, flux and solder.
There is another way to notpurchase a new oxygen sensor. And it is used by most car owners who are faced with the problem of damage to the lambda probe. The essence of this method is to trick the electronic control unit by slipping into it, instead of the working sensor, its emulator (blende).
To implement such a simple plan can be three methods:
In the first case, between the lambda probe and the receivinga special bushing (spacer) is installed by a pipe or collector. This is done in order to distance the sensor contacts from the exhaust gases. The potential difference at the same time on the electrodes of the probe is reduced, as it notifies the electronic control unit.
You can also reflash the computer by installing itmodified software that will not respond to an oxygen sensor failure. In order not to harm the electronics of the car, it is recommended to conduct such procedures with the involvement of specialized experts.
You can cheat the controller by changing the voltage value on the signal wire of the sensor. For this purpose, various home-made electronic devices installed in the gap conductor.
