Signs not to work lambda probe. Faulty lambda probe - is it possible to ride with a faulty lambda probe. Causes of work disorders and explicit signs

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To provide stable work The engine of the modern car uses a variety of sensors that collect information about the operation of a system. Based on their data the electronic unit Management Corrects Quality fuel mixes, regulates its quantity to enter the combustion chamber, determines the desired turns on-off various additional mechanisms.

In this article we will talk about what is oxygen sensor (lambda probe) VAZ-2114, Consider its design and principle of operation. In addition, we will try to understand the faults of this element and their elimination methods.

What is an oxygen sensor

The oxygen sensor is an electromechanical device designed to determine the quantitative oxygen content of exhaust gases. Its application is required for all cars with the class of ecology above "Euro-2".

Why is it needed? The fact is that modern environmental norms Require the minimum content of harmful connections in exhaust. It is possible to achieve their reduction only by forming an ideal (stoichiometric) fuel mixture. It is for these purposes that serves an oxygen sensor, or, as it is also called the lambda probe. Electronic having received information on the oxygen content in exhaust, increases or reduces the amount of air to form a mixture.

Where is the oxygen sensor

In cars VAZ-2114 Lambda Probe Can be located in different places, depending on the engine modification. In the "fourteenths", equipped with semi-liter power units, it is on top of the receiving pipe. You can get to it only from below, drove the car on watching pit or overpass. In 1,6 liter VAZ-2114 Lambda Probe It is much more convenient. It is screwed into the upper part of the exhaust manifold. You will immediately see it, lifting the hood.

How the oxygen sensor is arranged

W. VAZ-2114 Lambda Probe It has a fairly simple design. It is based on a ceramic element with two electrodes. Usually they are covered with zirconium dioxide. One of the electrodes is in contact with air (transferred outside the exhaust communications), and the second - with spent gases.

The principle of operation of the device is based on the potential difference arising between the contacts of the device during the engine operation. The electronic control unit sends an electrical pulse to the sensor and analyzes its changes. Based on the increase or decrease in the voltage on the probe contacts, the ECU "makes conclusion" about the amount of oxygen in the exhaust.

Lambda probe: Signs of malfunction (VAZ-2114)

The failure of the oxygen sensor "fourteenth" is usually accompanied by the following symptoms:

the "Check" warning lamp lights up on the instrument panel, the warning driver about the error occurred;
engine work on idling Unstable (turns float, the motor periodically stalls);
noticeable reduction in power and traction characteristics power aggregate;
the car "twitches" when the speed set;
increase fuel consumption;
exceeding the level of toxic substances in exhaust gases (determined by measuring on a specialized station).

What can tell the electronic control unit

If on dashboard The warning lamp focused on errors in the engine operation, and its combustion is accompanied by the above problems, it is advisable to test the controller. Today it can be done like at the station maintenanceand at home. Of course, if you have a special tester and laptop (tablet, smartphone) with appropriate software. When connected, this device will give you the codes of possible problems.

Car VAZ-2114 Lambda ProbeFounded, can declare its fault by the following errors:

What can happen to lambda probe

The resource of the lambda probe for the "fourteenth" declared by the manufacturer is 80 thousand km of mileage. But this does not mean that he cannot fail much earlier or last longer.

Cause malfunctions Lambda Probe VAZ-2114 may be:

overheating of the working element;
disruption of the tightness of the sensor connection with the exhaust manifold housing;
clogging of contacts of the device due to the use of poor-quality fuels, or oil hits (coolant) into gasoline.

Procedure for the emergence of problems with lambda probe

Finding signs of failure of the oxygen sensor, do not rush to run to the store for a new device. Replacing the lambda probe VAZ-2114 is not so cheap pleasure. The fact is that it is worth this sensor about 2.5 thousand rubles. Therefore, you first need:

visually inspect the lambda probe;
establish its modification (in case of acquiring a new and subsequent replacement);
check the performance of the probe.

What lambda probe on VAZ-2114

At the first models of "Samar", the fourteenth model with semi-fourth engines was installed sensors of the company "Bosch" 0 258 005 133. This lambda probe ensured the operation of the power unit in accordance with the requirements of the Norma "Euro-2".

Since 2004, VAZ-2114 engines have become equipped with Bosch sensors 0 258 006 537. They differ from the previous modification by the presence of the heating element. It is noteworthy that all oxygen sensors of the company "Bosch" for the "fourteenths" are interchangeable.

Check the efficiency of the oxygen sensor with their own hands

On VAZ-2114 for performance? Full diagnostics of the device can be implemented only with an oscilloscope. But it is possible to determine the worker or not, without complex electronics. This will require only a voltmeter. Connect its "minus" probe to the mass, and the "plus" to the output "B" in the sensor connector without turning it off from the on-board network. Turn on the ignition and look at the voltmeter readings. The voltage at the device outputs must match the battery voltage. If it is smaller, it means that the sensor circuit is possible.

If the voltage is all right, check the sensitivity of the working element of the probe. To do this, connect the "minus" probe voltmeter to the "C" of the sensor, and the "positive" to the contact "A". The voltage must be within 0.45 V. In case of exceeding this indicator, more than 0.02 V, the sensor must be replaced.

Repair or replacement

Having determined that the lambda probe "Fourteenth" is faulty, it can either try to repair, or just replace. The sensor restore consists in cleaning its contacts from Nagara. It is he who may be the reason that the device stopped functioning normally.

To begin with, the sensor must be unscrewed from the collector or receiving pipe. Make it is not always easy. The fact is that its body is very often accurates to the specified elements. exhaust system. In this case, fluid against rust (WD-40 or similar) can help. Treat the connection location with such a liquid and wait half an hour.

When the sensor is unscrewed, pay attention to its housing. He is unclear. The contacts that we have to be cleaned are behind the slots of the case in its lower part.

Important: Do not clean the contacts with the mechanical method (knife, sandpaper, supfyl, etc.)! So you only aggravate the situation and bring the sensor forever.

Cleaning contacts should only with chemicals. For example, orthophosphoric acid. Just put the lower part of the probe into the acid for half an hour, and then dry on the gas burner.

Do not stand and disassemble the sensor, sawing its housing. As practice shows, after such a procedure, its performance is no longer returned.

If you decide to replace the lambda probe, buy a new device in the auto shop, the corresponding specification, and install it in place of the old one. Turning on the ignition, start the engine, warm it up and check whether the "Check" warning lamp is on.

Ways to deception electronic control unit

There are still three ways to return the engine to the former workability without buying a new oxygen sensor. Without a doubt, they were invented by our craftsmen. And they are that the electronic control unit is misled so that it does not notice the errors in the sensor.

The first method is mechanical. For its implementation between the lambda probe and the collector housing (receiving pipe), a special spacer (sleeve) is screwed. Its use allows you to remove the contacts of the sensor from exhaust gases. Thus, the amount of oxygen between them is artificially increasing, and the electronic control unit "remains satisfied" the result obtained.

There is a similar deception of lambda-probe VAZ 2114 about 500 rubles. And if you have a lathe, you can make it yourself.

The next way to deceive the ECU is electronic. Its essence is to install a primitive converter in the sensor circuit, consisting of a single resistor (1 MΩ), which is soldered into the blue connector wire and one condenser (1 μF) connected between the blue and white wire. As a result of such a simple deception, the electronic control unit will constantly receive the signal of the desired voltage, and perceive the lambda probe work, as proper.

Alternatively, you can still reflash the controller, changing it software. But entrusting such manipulations with the "brain" of the engine is better to specialists.

How to extend the life of the lambda probe

In order for the oxygen sensor to serve as long as possible, do not neglect the following tips:

use only high-quality fuel;
do not allow oil fuel and other technological fluids;
watch out for working temperature engine, do not allow it overheating;
carry out the diagnosis of the oxygen sensor in accordance with the schedule of regulatory work provided by the manufacturer;
when identifying signs indicating problems with lambda probe, do not pull with the diagnosis.

One of the important elements of the engine output system is an oxygen sensor or lambda probe. The breakage of this device can cause serious malfunctions. vehicleSo the driver should always take care of the diagnostics of the regulator. From this material you will learn which lambda probe signs of malfunction, for what reasons the regulator breaks and how to replace it.

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Why can oxygen sensor fail?

Before you begin the diagnosis of signs and symptoms, as well as to repair one or another malfunction with your own hands, we suggest you familiarize yourself with the reasons for the failure of the regulator.

So why the regulator does not work:

The use of low-quality fuel. If the fuel is contained iron, water, elements of oil decomposition, lead and other malicious substances, this will lead to a regulator breakdown. Such components score platinum electrodes quickly enough to score them, two or three refills will be required by poor-quality fuel.
Preheating fault. The oxygen sensor is equipped with a special heating. If heating fails, the regulator can issue an error about the operation. Heating is an important element, since it is due to the heating driver receives accurate information from the lambda probe. If the regulator works without heating, then it will produce an incorrect amount of oxygen in the exhaust. Accordingly, heating comes into operation immediately after starting the motor. The heating breakage implies the repair and replacement of the sensor as a whole, since in the absence of heating the point from the regulator there will be no.
Overheating of the lambda probe housing As a result of the fact that the ignition advance angle was incorrectly installed. Also, the symptom of overheating can manifest itself as a result of too enriched fuel mixture.
If condition mastery rings bad it can lead to getting into exhaust pipe motor fluid. Accordingly, its impact on the sensor can be destructive and the need to repair or replace the device.
Failure in the operation of the ignition system are another reason why lambda does not work. We are talking about candles, coils, all sorts of modules and wiring. The cause can be cotton in the exhaust pipe - they are able to destroy the fragile ceramics of the device.
In the intake manifold motor manifests shots.
Incorrect launch of a car motor. The need to repair a malfunction occurs as a result of repeated and failed attempts by the start of the car motor, also from the fact that these attempts are carried out in small intervals. As a result, unburned fuel accumulates in the exhaust manifold of the exhaust gases of the motor. When the shock wave appears, the fuel can ignite.
Ceramic element in various supplies - solvents, cooling fluids, detergents, etc., may cause the need to repair the regulator.
Application of sealants when installing the regulator May lead to serious problems. Especially if at room temperature they can be vulcanized or the composition contains silicone.
As a result of the breakdown or poor contact of the device, as well as when closed on the mass of the output wiring There is a need to repair.
If the motor works with incorrectly adjusted valveswhich can be fit or clamped, or with valves, which has not been regulated for a long time.
In the motor cylinders, the wrong level of compression. If the compression is uneven, then this can lead to unbalanced combustion of the combustible mixture.
When mounting the timing belt, the device labels were incorrectly set. Or they could be violated during the operation of the vehicle.
Slugging of gasoline engine nozzles. Also, the need to repair a malfunction occurs as a result of clogging of the gasoline engine nozzles or due to the fact that there was an imbalance in their work.

Basic signs of faults

Next, consider the signs that will allow you to diagnose and check whether the proofreader of the lambda probe and the sensor in general or not. As practice shows, the device fails gradually, and not immediately. Therefore, if you do not know where the lambda probe is installed and how to check it, then most likely, signs of breakage you will not immediately identify. But if you familiarize yourself with the signs described below, there will be no problems during the inspection.

So, the failure of the regulator can be divided into several stages.

The first feature is that the device stops working in normal mode. In particular, during certain operating moments of the engine, the regulator refuses to generate a signal. As a result, the magnitude of idle speed begins to destabilize, that is, the turns are floating. This feature may indicate the need to restore the device. It should be noted that the turns can float in a very large range, respectively, with time it can lead to a decrease in the quality of the combustible mixture.
Another feature that speaks about the need to restore the device is that the car begins to twitch. As a result of starting and checking the motor, you can hear the cotton uncharacteristic for its work. In addition, if you notice when checking, a new indicator caught fire on the dashboard, this indicates that the device must be checked in more detail using a multimeter. If you don't have a multimeter, please contact an electrician.
The next step in which you can check the fault is the full failure of the regulator when working on an immentable engine. In this case, the control unit will prevent the driver about the malfunction and the need for repair - the engine power will decrease, while the gas pedal is pressed, a slow motion reaction will be felt. From under the hood, the same cotton will be coming, the car will be twisted when moving - these signs of faults say that it is necessary to repair and restore the device.
One of the most dangerous signs of a malfunction is to overheat the motor.
Also about the need to repair and restore can speak increased flow fuel, and from the silencer can appear nasty smell With a sign of toxicity.
If you have a modern car, then as a result of the device breakdown, the emergency blocking system can work. Accordingly, further movement on the vehicle will be impossible, the only way out is to cause the tow truck and take the car to repair.
One of the worst options for the further development of events can be depressurized by the device, since during depressurization of riding the machine will be impossible. There is a high probability of failure of the engine. When this process occurs, the exhaust gases do not go through the silencer, but enter the intake channel. When the driver is on the brake, the sensor sees the overabundance of oxygen in the system, as a result of which it issues a huge number of negative pulses. Thus, the injection control system can completely fail. If the regulator is unloaded, it is possible to learn about it as a result of power loss, which is especially felt when fast driving. Rods and cotton, as well as unpleasant smell - the same symptoms of breakage. You can also check the body of the exhaust valves and the place of installation of candles - the sediment may form on them (by video author - Hondadiagnostic Sistem).

How to independently check the lambda probe?

To check the sensor with your own hands, you will need a voltmeter. It can be a digital or arrogant, no difference.

So, the check is carried out in several stages:

First you need to turn on the ignition, but at the same time turn off the lambda probe is not recommended. Otherwise, the motor control unit can fix the error in the memory indicating the failure of the lambda probe heater.
The devices of the device must be pushed the wires that are suitable for the heater. Or you can stick the probe into the connector located on the part of these wiring.
Look at the Voltmeter screen - it should show the voltage level equal to the voltage in the battery. Remember that on the turned off engines minus with the computer may not be served. Accordingly, after that it is necessary to gently start the motor.

The positive wire is suitable for a heater device, as a rule, directly, the circuit can be protected by a fuse. As for the minus wire, it comes from the motor control unit. So if the plus is absent, then you need to check the electrical chain from rechargeable battery through the fuse to the sensor.

It is possible that on this plot of the chain is still installed relay. In the event that there is no minus, then you need to check the wiring that goes to the computer. There is a possibility that contacting contact on one of the connectors.

Instructions for replacement

How to replace the oxygen sensor with their own hands:

To properly remove the device, you should warm the engine, as well as turn off the ignition.
All wires are disconnected from the device.
Using a wrench, in some cases the end is required, it is necessary to unscrew the regulator failed. After the lambda probe is dismantled, it is also necessary to remove the protective cap, then the device is cleaned. For cleanings, you can use orthophosphoric acid, this option is one of the most efficient. After cleaning, rinse the regulator with clean water, set the place and check its performance.
In the event that the cleaning did not give effect, it is necessary to dismantle the old sensor and install a new one. The new component is mounted until it stops, you should not apply great effort. To ensure the tightness of the device, you can process it with sealant before installation.
Install all wires in place.

Video "How to change the lambda probe correctly"

About how to properly replace the regulator with your own hands, you can learn from the video below (video author - OASEX).

Sorry, currently there are no accessible surveys.

The fact that Lambda probe is and for what it is needed, unfortunately, not all car owners know. Lambda Probe is an oxygen sensor that allows the electronic system to control and balance the correct ratio of air and gasoline in combustion chambers. It is able to correct the structure of the fuel mixture in a timely manner and to prevent the destabilization of the engine's workflow.

This fairly fragile device is in a very aggressive environment, so its work must be constantly monitored, since when it is damaged, it is impossible to further use the car. Periodic check of the lambda probe will be the guarantor of stable vehicle operation.

Probe Lambda Probe Probe

The main task of the lambda probe is the determination of the chemical station of exhaust gases and the level of the content of oxygen molecules in them. This indicator should vary in range from 0.1 to 0.3 percent. The uncontrolled excess of this normative value can lead to unpleasant consequences.

With a standard assembly of a car, lambda probe is mounted in the exhaust manifold in the connection area of \u200b\u200bthe pipes, however, sometimes there are other variations in its installation. In principle, the location does not affect the working performance of this instrument.

Today you can meet several variations of lambda probe: with two-channel layout and broadband type. The first appearance is most often found on old cars released in the 80s, as well as on new economy-class models. The broadband type sensor is inherent in modern middle and top class cars. Such a sensor is capable not only to accurately determine the deviation from the norm of a certain element, but also to balance the correct ratio.

Due to the diligent work of such sensors, the working resource of the car is significantly increased, the fuel consumption is reduced and the stability of the holding of non-stroke revolutions increases.

From the point of view of the electrical side, it is worth noting that the oxygen sensor is not capable of creating a homogeneous signal, since this prevents its location in the collector zone, because in the process of reaching the exhaust gases of the device there may be a certain number of working cycles. Thus, it can be said that Lambda probe responds more to the destabilization of the engine operation, which he actually subsequently and notifies the central unit and takes appropriate measures.

Basic signs of lambda probe malfunction

The main sign of the lambda probation malfunction is the change in the engine operation, since after its breakdowns, the quality of the fuel mixture into the combustion chamber is significantly deteriorated. The fuel mixture is essentially uncontrolled, which is unacceptable.

The reason for the exit from the working state of the lambda probation may be the following:

depressurization of the case;
penetration of external air and exhaust gases;
overheating of the sensor due to poor painting of the engine or improper operation of the ignition system;
obsolescence;
incorrect or intermittent power supply, which leads to the main control unit;
mechanical damage due to the incorrect operation of the car.

In all those above cases, except for the latter, the failure occurs gradually. Therefore, those car owners who do not know how to check the lambda probe and where it is generally located, most likely, will not immediately notice a malfunction. However, for experienced drivers, determine the reason for changing the engine work will not be difficult.

A gradual failure of the lambda probation can be divided into several stages. At the initial stage, the sensor ceases to function normally, that is, in certain working hours of the motor, the device ceases to generate a signal, which subsequently destabilizes the magnitude of the idle speed.

In other words, they begin to fluctuate in a fairly extended range, which ultimately leads to the loss of the quality of the fuel mixture. At the same time, the car begins to be dereliciously twitch, you can also hear the uncharacteristic work of the cotton engine and necessarily on the instrument panel lights up the light bulb. All of these abnormal phenomena will signal the car owner on improper work of lambda probe.

At the second stage, the sensor stops working on a non-heated engine at all, while the car will be all sorts of ways to signal the driver about the problem. In particular, there will be a tangible decline of power, slow-down response when exposed to the accelerator pedal and all the same cottons from under the hood, as well as unjustified car jerking. However, the most significant and extremely dangerous signal of the lambda probation failure is the engine overheating.

In case of full ignoring of all previous signals indicating the deterioration in the state of the lambda probe, its breakdown is inevitable, which will cause a large number of problems. First of all, the possibility of natural movement will also suffer, fuel consumption will also significantly increase and an unpleasant sharp smell with a pronounced shade of toxicity from the exhaust pipe will appear. In modern automated cars, in the event of a breakdown of an oxygen sensor, an emergency lock may be activated, as a result of which the subsequent movement of the car becomes impossible. In such cases, only an emergency call for the tow truck can help.

However, the worst version of the development of events is to depressurize the sensor, since in this case the movement of the car becomes impossible due to the high probability of the motor breakage and the subsequent expensive repair. During the depressurization of the exhaust gases, instead of accessing through the exhaust pipe, fall into the intake canal of atmospheric reference air. During braking, the lambda engine, the probe begins to fix the overabundance of oxygen molecules and urgently gives a large number of negative signals than completely displays the injection control system.

The main sign of the depressurization of the sensor is the loss of power, it is especially felt during the speed movement, a characteristic tapping from under the hood during a movement, which is accompanied by unpleasant jerks and an unpleasant smell, which is thrown out of the exhaust. Also, the depressurization is also evidenced by the visible sediment of the seasy formations on the casing of exhaust valves and in the field of candles.

How to determine the malfunction of the lambda probe tells on the video:

Electronic check of lambda probe

Learn about the status of the lambda probation by checking it on professional equipment. This uses an electronic oscilloscope. Some specialists determine the performance of the oxygen sensor using a multimeter, however, it is capable only to state or refute the fact of its breakage.

The device is checked during the full operation of the engine, since the sensor cannot fully pass the picture of its performance. In the case of even a minor disheaval from the norm, the lambda probe is recommended to replace.

Replacing lambda probe

In most cases, such a detail, as a lambda probe is not subject to repair, as evidenced by the statements about the impossibility of the work of repair from many car manufacturers. However, the overestimated cost of such a node official dealers Breaks off all the hunt for his acquisition. The optimal output from the current situation can be a universal sensor, which is much cheaper than the native analogue and is suitable for almost all automotive stamps. Also, as an alternative, a used sensor in use can be purchased, but with the duration of the warranty period or a fully exhaust manifold with a lambda probe installed in it.

However, there are cases when lambda probe operates with a certain error due to severe pollution as a result of sedimentation on it products of combustion. In order to make sure that this is true, the sensor must be checked from specialists. After checking the lambda probe took place and confirmed the fact of its complete performance, it must be removed, clean and install it.

In order to remove the oxygen level sensor, it is necessary to warm its surface to 50 degrees. After removal, the protective cap is removed from it and only after that you can proceed to clean. It is recommended to use orthophosphoric acid as a highly efficient cleaning agent, which can easily copes even with the most resistant combustible sediments. Upon completion of the soching procedure, the lambda probe is rinsed in clean water, carefully succishes and is installed in place. At the same time, do not forget about the lubricant of the thread with a special sealant, which is to provide complete tightness.

Very complicated, so it needs to continuously support the performance and timely preventive work. Therefore, in the event of suspicion of malfunction of the lambda probe, it is necessary to immediately diagnose its performance and in case of confirmation of the fact of failure, replace the lambda probe. Thus, all the most important vehicle features will be preserved at the same level, which will become a guarantor of the lack of further problems with the engine and other important elements of the car.

Lambda probe is an oxygen controller. It is used to control and balancing the proportions of air and fuel in the formation of a combustible mixture. The correct functioning of the element will prevent the destabilization of the working process of the motor. To determine the cause of the breakdown, you need to know the signs of the lambda probe malfunction.

External signs and reasons

If the heating system of the lambda probe or the device itself in the car does not work, the symptoms of the defective state will be as follows:

The power unit began to work less stable. Turns can spontaneously increase and fall. Motor often stalls, especially on traffic lights.
The quality of the combustible mixture has decreased, which rises with air into the cylinder system. If the serviceability of the sensor was broken, it will be the cause of fuel recalculation.
Fuel supply has become ineffective, fuel falls into the combustion chambers uncontrollably. This may lead to a malfunction in the work of the unit, as well as the electronic system of the car.
Over time, the intermittentness of the motor operation may appear when operating at idle. At maximum - efficiency the work of the DVS It will also be less low.
There were problems in operation electronic systems. Due to the need to repair the sensor, individual power unit compartments will be unstable. This is due to the fact that pulsed fault signals are fed with a delay.
During the movement, the vehicle began to twitch. Especially when the car goes to the mountain.
When operating the engine on any turns, cotton can appear.
The engine has become a slowdown to react to the press of the gas pedal. Acceleration occurs, but not immediately.

One of the important symptoms is to light the indicator of the Angourt check or the light bulb of the oxygen controller on the instrument panel of the car.

The reasons for which the operability of the oxygen sensor will be broken, may not occur immediately, so the failure of the part occurs in several stages:

On the first oxygen sensor begins to function unstable. Periodically, the signal from the device disappears, the information is supplied in an extensive range. This leads to a deterioration in the quality of a combustible mixture, as well as unstable work revolutions. At the initial stage, twitching the car occurs when moving uncharacteristic MOCs are manifested, the fault indicator may catch fire on the tidy.
At the next stage, the lambda probe stops functioning on a cold motor until the unit warms up. Symptoms of problems will be similar, only manifests themselves with greater force. The power of the engine motor can be reduced, response will appear when you press the gas pedal. As a result, this can lead to OVS overheating.
At the third stage, the oxygen sensor usually fails. The power of the power unit drops even more, it is clearly manifested when driving at high speed. An unpleasant and sharp smell appears from the muffler.

The reasons with which the oxygen sensor breakage may be associated:

There was a depressurization of the device of the device. Because of this, the spent gases and air began to enter inside.
Overheating controller. The reason may be associated with malfunctions in the operation of the ignition system or incorrectly performed tuning of the force aggregate.
Prolonged impact of external factors. This reason can be attributed to natural wear, since any oxygen sensor over time fails.
The operating surface of the oxygen sensor is covered with combustion products that block its operation. This is usually associated with regular use of low-quality fuel.
There was a violation in the operation of the power supply or damaged wiring leading to the central control unit.
Mechanical damage to the device. As a result of a strong impact on the body, the internal elements of the controller can be collapsed. This is often manifested with regular roadway driving.

The TV channel "Online Store Auto Parts" spoke about the causes of faults in the operation of oxygen controllers.

How to check the multimeter

Before the diagnosis of the oxygen sensor itself, its heating device is checked.

The tester can be checked for the operation of the heating component of the oxygen sensor:

The diagnostic device switches to the resistance parameter measurement mode.
The device's proves are connected to the heater contacts. These elements are usually made of a cable characterized by a large cross section.
Call contact of the heating device.
If the heating element is worker, then the resulting resistance value will be less than 10 ohms. If this parameter is higher, then the electrical heating device failed, it is required to replace it.

Tester check is performed as follows:

Find the location of the controller under the hood of your car.
Multimeter probe Connect to the signal outputs of the sensor or electrical caps. In the tester itself, the measurement limit is set to 2 volts.
At the next stage, it is necessary to artificially create a situation of a releasing combustible mixture. To do this, you can use the Peregazovka method, periodically clicking on the gas pedal. Either you can dismantle the pressure sensor connector.
Then the testimony that issued a tester is read. Ideally, they must compile from 0.8 volts, this indicates the health of the oxygen sensor.
It is necessary to artificially create a situation of a depleted mixture. To do this, you can make air seats, slightly weakening the body of the air duct. In the depleted mixture, the tester readings should be not more than 0.2 volts.

V_i_t_a_l_y spoke about the diagnosis of the oxygen controller using a multimeter.

Other diagnostic methods

If there are signs of a lambda probe malfunction, it is possible to take advantage of working capacity computer diagnostic. It allows you to control the operating parameters of the oxygen sensor online.

You can use the oscilloscope for diagnostics. If the check showed that the lower limit of the device is reduced to zero volt, the controller is working, but soon it will be necessary to change it. If the curve of the time dependence of the voltage on the signal contact is characterized by a greater smoothness, then the sensor is already time to replace.

Properly start the diagnosis of four-pin oxygen sensors with visual inspectionThis procedure is recommended to perform every 10,000 mileage kilometers. The check controller is dismantled from the collector, and it is impossible to use the WD-40 tool or brake fluidSince their hitting on the working surface will lead to its breakdown. If applied special means When unscrewed the threaded thread, the remnants of themselves are removed before removing the device.

Rate the color, as well as the state of the oxygen controller working area. If traces of soot are visible on it, it speaks of a re-entered combustible mixture in the engine. Its presence leads to the contamination of the device, so it is necessary to remove so high in the device. Rock gray either white color Specifies to the use of additives in the engine fluid or stuel. The presence of a brilliant laid says that the lead concentration in the fuel is exceeded. If the raid is intense, then the sensor will not be repaired, it must be replaced.

Repair instructions and replacement of the sensor

With your own hands, you can replace or restore the controller.

How to dismantle the sensor

Removing the device, regardless of the model of the machine, is performed as follows:

Hell the surface surface of about 60 degrees. To do this, you can use the usual lighter or burner. Warming will make it easier to remove the device from the landing place.
Disconnect the wires connected to the part.
Carefully unscrew the oxygen sensor. Use special needs for dismantling is not recommended.
Remove the protective cap.

Dima Stepanenko told about the independent dismantling of the lambda probe.

Cleaning and soching

There are two options for restoring an oxygen sensor:

first - using orthophosphoric acid;
second - with orthophosphoric acid and burner.

It is necessary to take into account that orthophosphoric acid or other similar means refers to the category of hazardous substances. When working with a substance, it is important to remember the safety rules. It is impossible to make acids to the mucous membranes either into the organism.

First method

This method cannot be called accelerated, since the consumer needs to get a complete or at least partial access to the ceramic surface of the device. This component is hidden behind a protective cap made of metal, dismantling it is not easy. For removal it is impossible to use the hacksaw, because it will damage the working surface. The dismantling is performed using a turning machine - at the base of the oxygen sensor, it is necessary to cut off the protective cap using a cutter. Cutting is performed next to the thread.

If there is no possibility to use the machine, it is allowed to use a file. Fully remove the cap this tool will not be released, then it can make small windows with a size of about 5 mm. Approximately 100 ml of orthophosphoric acid is used for purification. In its absence, you can use the rust converter.

Recovery of the device:

Pour fluid into a glass container. You can use banks, glasses, etc.
Lower the core of the oxygen sensor in the container. Fully controller can not be lowered into liquid. Wait about twenty minutes.
Remove the sensor from the container, flushing its base with water from under the tap. Wait until the device is completely dry.
If the first time to remove the dark raid on the core did not work, repeat the procedure. It is necessary to ensure that the element is again metallic color.
If after several attempts to perform high-quality cleaning, it is possible to use a brush to enhance the effects. It is wetted and the base of the device is being processed. As a result, the flare must be removed. If the protective cap was dismantled, then the brush will not need. Instead, it is better to use a toothbrush.
After cleaning was fully completed, the sensor was washed. If the cap was dismantled, then after restoring it must be installed in place. For this, argon welding is applied.

When using this method, consider:

If the device is badly contaminated, then twenty minutes will not be enough to restore it. With critical clogging, the soching procedure can be increased to three hours. In some situations, cleaning may require a whole night, at least eight hours.
After cleaning, you need to check how efficiently the procedure was performed. For diagnostics, it will take a certain time so that the car owner understands how the car behaves and how much the fuel "eats". If the malfunction indicator remains on the tidy, then the controller did not work out.
If the machine is equipped with a sensor, the protective cap of which is equipped with a double shell, then make the hole in it will not be released. To solve the problem, it is necessary to soak the device in acid or another tool with the cap.

The process of cleaning the oxygen controller is shown by Alexander Sabegatulin.

Second way

To restore the controller, you will need the same acid, as well as the gas burner or a kitchen stove. When using a household stove, give preference to the small size of the burner.

Cleaning procedure:

Cover is removed from the burner. Then it turns over and is installed back, with a little displacement to the side. It is necessary to install the lid so that it covers the pipe itself from fluid ingress.
The fire on the burner is lit.
The lambda probe core should be dipped into the acid container, after which take it with the passatsia and heal on fire. This will lead to the boiling of acid, the substance will start splashing. A greenish tint salt will appear on the working surface of the device.
Wait until the substance is completely popped. Rinse the controller with clean water, and then repeat the cleaning procedure. These steps must be performed until the controller is completely glilate. This may take about ten minutes or more. Before further installation, lambda-probe threads need to be processed. graphite lubricantThat will prevent the oxygen burning of the oxygen sensor to the threaded hole.

Installing a lambda probe

Installation of the device is performed in the reverse order:

A protective cap is installed on the sensor.
Wires are connected to the device.
The controller is installed in the seat and twisted.

How to make a corrector (cheating) lambda probe?

There are several types of proofreaders for oxygen controllers. Mechanical device It is the most simple and accessible in terms of performing proofreaders. It is necessary to sharpen a special adapter, which establishes a lambda probe, as well as a mini-catalyst. After that, the collected device is mounted in the regular silencer seat of the machine.

If a catalyst device is broken or an oxygen sensor installed after it is broken, a signal will receive a signal. The module will be warned that in exhaust gases are contained. harmful substanceswhose volume exceeds the permissible value. The control unit will perceive this event as an emergency and increase the fuel supply to enrich the fuel and air mixture.

When installing such a corrector, the exhaust gases will flow through a small adapter hole to the catalyst device. The latter is filled with ceramic dust with a catalytic layer. The concentration of malicious substances in the exhaust gases will be less. The control module will perceive it as the correct operation of the controller and the standard catalyst device. The manufacture of the bellows is performed using a lathe and the diagram, the use of steel or bronze is allowed as a material.

Mechanical Corrector Scheme for Lambda Probe

Universal drawings that can be found on the network may not suit for the manufacture of lambda probe decks to a specific auto model, you need to look for a proven option.

Manufacture electronic tricks Controller:

Using the program, the sprints and printer prints the drawing of the wiring and location of the schema elements. Printing is performed on glossy paper.
When sending a file to print for a layer K1, you need to choose a black color by 100%. In the program, check the box opposite the items of the mirror and circuit circuit. All other layers are removed.
Then goes on printing the following layer. For the layer M2, black color is indicated. The tick opposite the item is mirrored, but it is left in front of the second element. Other layers are cleaned.
When performing the task, foil textolite is recommended. It must be one-sided, and its thickness will be at least 1 and no more than 2 mm.
When the printout is on hand, it must be transferred to the LM324 board using an iron. The board itself is cut with dimensions, and in its contour it is necessary to make printouts. After cutting, attach the diagram to the drawing, the dimensions must completely coincide.
Using fine-grained emery paper, the copper layer is performed. With a fuel or solvent, cleaning the board is cleaned.
Then it is necessary to transfer a printout with tracks to the working surface. A printed layer of elements is installed on the reverse (copper surface). For this, foil paper is applied to the board and warms up the iron, the procedure takes no more than 10 minutes. When warming the surface surface, you need to press the board as much as possible. As a result, the toner should be reprinted with a foil surface on the scheme. If the density of the paper is low, the tracks will be shunning. The problem can be corrected using a permanent black marker.
The next step will be etched, this requires a chlorine iron or sodium perchlorate.
Then the holes are drilled on the board, the soldering elements are performed.
At the final stage, the operating parameters of the corrector are made. To do this, the input is +950 mV, the voltage value is adjusted in the range from 950 to 1000 mV. For the LM324 board, the procedure is done by setting the elements VR3 and VR4.

Connection of all components on the fee

How much is?

The cost of the device will be different depending on the manufacturer and the brand of the machine.

Video "Installation of mechanical decking lambda probe"

Channel "Replacing Oil and Other Sites" told about independent installation mechanical corrector of the oxygen sensor.

Most cars released from the end of the 70s - early 80s are equipped with catalytic exhaust gas neutralizers (in spacious -), which make it possible to significantly reduce the toxicity of waste materials, reducing the damage that is applied to the environment. Enough interesting fact It is that the catalyst can maintain functionality exclusively under the conditions of ideal mixing, at which on 1 part of the fuel accounted for from 14.6 to 14.8 parts of atmospheric air with a normal oxygen content. So that the mixture has not been re-engaged or conceded, it is necessary to apply electronic control Fuel supply - in such a system, the quality of the combustible composition controls the lambda probe. Despite its location in an aggressive medium, this device is quite fragile and unstable, and is subject to frequent. If the lambda probe stopped working in your car, it is possible to detect the signs of malfunction without specialized equipment - it is impossible to continue the operation of the vehicle.

Mechanism of action

Lambda probe determines the chemical composition by finding oxygen and determine the percentage content. During the normal state of the mixture, this indicator is 0.1-0.3% - small oscillations are allowed due to the fact that the fuel supply mode into the motor cannot be stable for a substantial period of time. The lambda probe is installed directly into the exhaust manifold - usually its installation is carried out at the connection site of the connections from different cylinders (in the surprise - "pants"), although there are other options.

There are various modifications of lambda-probes -, as well as vehicles for the previous years of the device, have a two-channel layout. They can only determine the presence of oxygen detection in positive or negative sidethat is accompanied by a change in the voltage of the electrical signal transmitted to the electronic unit. However, all modern cars of the middle and elite classes are already equipped with lambda prouds of broadband type, which are already intended to determine the percentage deviation of the content of the desired element from the norm. This achieves a significant improvement in the performance of the motor:

Increasing the stability of the retention of revolutions;
The cost of fuel is reduced;
The resource of the vehicle increases.

If you are interested in the electrical side of the lambda probe work, it is worth mentioning that this device cannot form a homogeneous signal. Due to the fact that the standard lambda probe is located in the graduate manifold, when a point of its location of the exhaust gases can already pass several working cycles. In this case, the quality of mixing is worsens by 3-5%, which is accompanied by some destabilization of the operation of the motor. The lambda probe responds to this by changing the voltage supplied to the central injection control unit, which takes the necessary measures.

We define breakdown

Exterior signs

If the lambda probe malfunction is a significant deterioration in the quality of the fuel mixture, which is externally expressed in the deterioration of the motor operation. It is worth saying that there may be many - among them you can allocate the following main:

Depressurization of the sensor housing, penetration into atmospheric air and exhaust gas;
Overheating lambda-probe as a result and inept motor tuning;
Failure as a result of prolonged exposure to the aggressive medium (aging);
Blocking the working surface of the lambda probe products of the combustion of poor-quality fuels;
Disorders of normal power supply and interruption of the line leading to the control unit;
A strong blow on the lambda probe body with the destruction of internal components, for example, with active driving on bad roads.

In all cases, in addition to mechanical damage, accompanied by depressurization, lambda-probe malfunctions appear gradually, with a stepwise deterioration. Another exception is the wiring break - however, it cannot be considered a malfunction of the lambda probe itself, so it should be considered in a separate topic for discussion. For all the rest, the following stages of malfunction development can be distinguished.

Video on how to check the lambda probe:

Initially, the device ceases to perform its functions in the limit modes of engine operation, when its electrical characteristics are already deteriorating so much that the sensor cannot form. The lambda probe malfunction is manifested in destabilizing idle speed, which begin to "swim" in a fairly wide range, the length of which is 300-600 rpm. When achieving very high revolutions that do not belong to the critical level, a sharp change in the quality of the fuel mixture can occur. At the same time, the car can be strongly twitched, from under the hood in some cases there are rippled cotton, and a control lamp flashes on anomalous engine operation. When the revolutions decrease, all signs of the lambda-probe breakdown disappear, but it is impossible to ignore them.

At the second stage, the device stops working on an immentable engine - while the temperature does not reach the utmost possible, the car will feed all the signs of malfunction inlet system or gas distribution mechanism. In particular, you will notice a significant deterioration in power, extremely slow reactions to changing the position of the gas pedal, as well as jerks and cotton. The car with a malfunction of the lambda-probe can be twitching, slow down as a result of a complete stop of fuel supply, and. After about 5-10 minutes of driving in such an unpleasant mode, the visible stabilization of the vehicle state occurs - however, it is exceptionally temporary.

If you do not make any measures regarding the lambda probe faults at the previous stage, the device will finally fail, which will cause a plurality of negative consequences. In addition to a significant deterioration in the dynamics and the impossibility of normal movement in continuous modeYou will face an increase in fuel consumption by 15-30%, as well as with a significant increase in exhaust toxicity, determine which can be used with a clearly tangible bowel of fuel. Modern cars can generally block all the driver actions with a faulty lambda probe by switching to emergency mode.

The worst option

If the above-mentioned depressurization of the lambda probe has occurred, the operation of the car is impossible to continue, as this can be a prerequisite for the complete failure of the engine with subsequent expensive repairs. With this phenomenon traffic fumes Enrolled in the channel, which is used to fence atmospheric reference air in order to compare two types of gases and determine the optimal oxygen content. If the engine is braked, the atmospheric air passes with a minimum amount of impurities - therefore, the lambda probe sees that the oxygen collector is much larger than in the environment! The result of this is the formation of powerful negative signals that fully violate the normal operation of the injection control unit.

Electronic diagnosis

If you want to know what signs of the lambda probe malfunction may be discovered during a professional inspection, you should find specialized equipment. In the study of the lambda probe, an electronic oscilloscope is used - some experts recommend using a multimeter, but it can only state the fact of failure of the device. The device is checked on a running engine, heated to the contour temperature, equal to 80-90 degrees. In a cold condition, the sensor may testify significantly deviating from the norm.

Signs of malfunction of the device can be a lot. They are represented by the smooth characteristics of the signal or an increase in the level not exceeding 0.1 V. In addition, it is worth paying attention to the curve form - the changes should be fairly steep, not allowing a smooth increase in voltage. Experts say that the lambda probe must change the signal level every 120 ms - otherwise it is possible to talk about its malfunction.

Car repair

Almost all manufacturers of vehicles and individual components claim them that lambda probe is not subject to repair - only required full replacement node. At the same time, its cost can be quite impressive - especially if you are the owner of the car of an elite brand. A common output from the position is to acquire a universal sensor equipped with a special adapter for a specific type of vehicle. Such instruments manufactures Bosch - using its services, you can even purchase used recovered spare parts that are distinguished by a reduced value and limited duration. In addition, you can buy and used the exhaust collector with a pre-installed lambda probe.

If you are absolutely confident that the lambda probe operates incorrectly as a result of deposits on it products of combustion, it can be tried. For this, the device is dismantled at a surface temperature of 40-50 degrees, remove the protective cap and immerse contacts into orthophosphoric acid. After several flushes, the lambda probe was washed with clean water, thoroughly dried and installed in place, without forgetting to lubricate the thread with a special sealing paste. The tightening torque is installed by the manufacturer - it usually varies within 40-60 nm. Such a procedure helps in 80% of cases of faults described.

The main thing is timely diagnosis

If you find out that the car malfunction is precisely in the breakdown of the standard lambda probe, then you can spend required repair Even before the consequences will touch the engine, leading to its essential breakdown. In addition, by removing a similar problem, you can save essential characteristics The vehicle is at the same level, which will help you use it as fully and profitable. What method of eliminating a malfunction to choose - to solve you, but it is worth remembering that it is very dangerous to work with the electronics of the car without having relevant qualifications.