Automotive industry has long been equipping its "offspring" with ABS sensors, which activate an additional brake force distribution system. This equipment starts its work with a sharp braking of a car, accompanied by blocking of one or a pair of wheels. The ABS unlocks these mechanisms, allowing them to continue rotating and smoothly decelerating the machine. The undoubted advantage of cars with "anti-lock" is a significant increase in the level of comfort and safety of their drivers and passengers.

The only drawback of the system is that it has fine settings, so it can fail quite often. This is especially true of cars in the budget segment, where the manufacturer always saves on quality, or cars with high mileage. The occurrence of interruptions in the operation of the ABS can be easily identified by the illuminated warning lamp on the instrument panel - this will be the first signal of a malfunction.Let's take a closer look at why the ABS sensor is on and what can be done in this case.

Anti-lock wheel system device

To better understand the causes of major faults aBS systems, you need to consider all its constituent elements:

The ABS warning lamp must necessarily light up when the ignition is turned on, informing the driver that the equipment is ready for operation. After starting the engine, the light should go out immediately, indicating that there are no problems.

Attention! If the ABS warning lamp remains on continuously or lights up intermittently while driving, this indicates a serious problem in the vehicle's braking system.

Why the ABS sensor can light up

The question is why the ABS sensor on dashboard, increasingly worries our motorists, because already the overwhelming majority modern machines have this equipment. So, there may be several reasons for a malfunction:

• failure of fuses;
• poor contact at the junction of the wiring and system elements;
• failure of the ABS sensor (one or several at once);
• malfunction of the wheel bearing;
• failure of the electronic control unit;
• loss of communication with the sensor.

It should be added that the correct readings of the controller lamp can also be affected by interruptions in the operation of the generator or other elements of the car's electrical circuit.

Of course, such a variety of reasons can lead the owner of the car into some stupor and force him to immediately seek help from specialists. However, experience shows that you should not rush to the car service right away, first you need to try to fix the malfunction yourself.

What can be done if the ABS sensor is on

If your car is equipped with an on-board computer, you can try to read and decipher the error code. This will help to find out about the malfunction in more detail - the Internet is full of forums where motorists exchange similar experiences. Naturally, self-diagnosis of the anti-lock system does not guarantee a complete solution to the problem, since the driver does not always have special equipment at his disposal.However, certain activities can be performed without it.

Checking the fuses

The uninterrupted operation of the ABS system is ensured by several fuses, which are usually located in mounting block under the hood of the car. More detailed location of these elements can be found in the vehicle operating instructions. If defective fuses are found, they must be replaced.

Checking the electronic control unit connector

The system control unit is located in engine compartment, it is easily recognizable by its six brake pipes and a bundle of wires that fit to it. It is necessary to disconnect the connector with these wires from the control unit and inspect it for mechanical damage or moisture. The damaged part needs to be replaced, filled with water - to dry.

Checking the wheel bearing

The reason for which the ABS sensor caught fire may be a wheel bearing malfunction. The check is carried out as follows - if at a speed of 80 km / h a strong hum is heard in the area of \u200b\u200bthe front or rear wheels - the part is out of order. It is urgent to replace the bearing if it is found to be faulty.

Inspection of sensors

ABS sensors are installed in all wheel hubs car. Their inspection should be carried out as follows:

If the sensor malfunction is confirmed by a diagnostic error code on-board computer, the part can be replaced by yourself. Step-by-step instruction on the implementation of this activity is presented in one of our reviews. Note that it also happens - the owner changed the ABS sensor, but the light is still on. In this case, you will need to check everything again, and if you do not find the reason, you will have to go to a car service.

Some nuances

If the ABS sensor does not burn continuously, but turns off and on while the car is moving, this usually indicates a violation of the contacts or connections of the system. In this case, you can try to accelerate the car on a flat surface to 60-70 km / h and brake sharply. After completing this maneuver two or three times, you need to again pay attention to the indicator light. If it is still on, you can remove the terminals from the battery by "resetting" the electronic control unit.

Oddly enough, but an ordinary one can solve the problem with a burning light bulb. car wash... The fact is that the ABS sensors are located on the most dirty mechanisms of the car - its wheels - and they themselves are often splashed with mud. It is necessary to direct a stream of water under pressure to the wheel hubs, cleaning their surface. After that, the contact terminals must be thoroughly dried.

Many motorists try to completely turn off the equipment if the ABS sensor lights up, as they are afraid of abnormal operation of the system. The fact is that the inclusion of anti-blocking at the moment of light braking at low speed can lead to a breakdown of the chassis of the machine or an emergency. Note that a complete shutdown of the system is fraught with even greater consequences, since it significantly reduces the level of safety of all road users.

Summarizing

Interruptions in the operation of the ABS is a rather serious and very unpleasant moment that can arise when servicing any car equipped with this equipment. If all activities are self-diagnosis systems have been completed, and the ABS sensor is still on - you need to immediately contact a specialist, because not only personal safety, but also life depends on the correct operation of the system. To learn more about the causes of the malfunction and how to fix it, this video review will help:

Continue driving with a burning aBS badge it is possible, but you need to understand that the anti-lock braking system will not work normally.

In winter, on ice, failure of the ABS can lead to skidding braking, wheel blocking and skidding of your Renault. Therefore, it is important to find and correct the reason why the lamp came on.

How the system worksABS normal

Recall that ABS - Anti-lock Braking System - in the car it prevents the wheels from locking and consists of a system of sensors that control the speed of the car and rotation of its wheels, as well as a hydraulic unit and a control unit The control unit processes the signal from the sensor, the hydraulic unit distributes the pressure to the brake pads.

The main task of the anti-lock braking system - change the pressure in the line of the brake system in such a way that, based on the data on the speed of rotation of the wheels, the car can urgently brake, while maintaining controllability.

Modern ABS systems are reliable and are often paired with EBD, which distributes braking forces. The most vulnerable point in anti-lock braking systems is the wheel sensor, because it is constantly exposed to dirt and shock, for example, when repairing wheel hubs.

You will understand that the ABS system is working in your Renault when, with intensive braking on a slippery surface, the brake pedal begins to vibrate (give it to the leg, twitching and jerking), and a characteristic crackling sound will be heard.

Why does the error appearABS

Normally, the ABS light comes on immediately after starting the engine and goes out after a couple of seconds when the onboard computer checks (and approves) the operation of the system itself.

If the light comes on while Renault is in motion, or does not go out soon after starting the engine, the reason could be that:

• aBS fuse blown
• the ABS wheel sensor is out of order - due to mechanical damage or a change in the gap between the sensor and the gear rotor
• contact with the system sensors is lost - the wiring is cut off, the terminals are oxidized
• the voltage in the on-board network has dropped below 10.5 V (the battery is dead, the generator does not work, etc.)
• the electric motor of the hydraulic pump is out of order
• the hydraulic valve or the ABS control unit are out of order (rare breakdown).

Also, the ABS lamp may light up after an illiterate repair of your Renault due to the inept actions of the master who damaged the sensor or wiring.

What to do if the ABS light comes on

In order to prevent problems in the ABS system, you need to constantly monitor the health of the battery, generator and relay-regulator. The anti-lock control ECU reacts strongly to voltage fluctuations. Normal operating voltage is 12-14.2 V.

If the ABS warning lamp on your Renault lights up, the search for the cause of the malfunction is worth start with fuses.

Then you need to inspect the wheel sensors for integrity, check the wiring. An oxidized sensor connector or a frayed wire is often the cause of the problem.

• If the ABS badge lights up on the Renault dashboard after a recent replacement brake pads or hubsthe master may have forgotten to connect the ABS sensor connector. Or it needs to be cleaned from dirt.
• If the icon comes on after a long period of slipping, it is enough to brake vigorously several times and the icon will go out. In this case, this is the normal reaction of the anti-lock braking system to Renault skidding.
• If the ABS lamp goes out, then flashes again - the reason must be sought in the contacts of the sensors.

You can check the leakage of current from the on-board network, armed with a multimeter.

After you find and fix the problem, do not be lazy to check the operation of the ABS system simple test: accelerate to 40 km / h and depress the brake pedal sharply. Does the pedal vibrate and crunch? This means everything is working as it should.

If the icon does not go out even after fixing the problem, contact the computer diagnostics specialists to determine the error code on your Renault - and fix it (or reset).

• Why the speed of the Renault is floating, we wrote

Vesta, Largus, Granta, Kalina, Priora, Niva 4 × 4), without exception, are equipped with ABS (anti-lock braking system).

During the operation of the car, many owners notice that the ABS and ESC lamps light up on the instrument panel (if this system is present). We figure out how to solve this problem and finalize the design.

WHY THE ABS AND ESC LADA LAMP IS ON

An ABS malfunction can be caused by:

• failure of wheel rotation sensors;
• malfunction of the hydraulic valve block;
• damaged wiring.

If the ABS fault warning lamp comes on, you should contact the service station as soon as possible for diagnostics (read error codes) and repair.

The most common cause of ABS failure is damage to the wiring near the ABS sensor connector. It is under the wheel arch liner, but still not well protected from moisture and dirt.

As a result, the wires oxidize and break, and the ABS lamp lights up.

HOW TO REPAIR LADA WIRING

We remove the wheel, and then the locker (for front wheel, unscrewing the fastening screws) or a protective shield (for the rear one, unscrewing the two fastening nuts "by 10"). Press the latch and disconnect the block with wires from the ABS sensor. We inspect the connector and make sure there is no corrosion or damage. In case of damage, we restore the integrity of the wires:

We process special means for the cleaning electrical contacts (for example, graphite grease) and clean the contacts from oxides. We clean the wheel speed sensor and the surface around the sensor from dirt.

Attention! Keep the ABS sensors away from magnets as this may damage it.

Articles about Lada X Ray Cross

REPLACEMENT OF ABS SENSORS LADA

If the cause of the malfunction is not in the wiring, but in the ABS sensor itself, we change it. To do this, first unscrew the fastening screw with a T30 Torx wrench, and then remove the sensor wiring harness from the bracket. The photo shows the Lada Vesta car, on other Lada models the work is done in a similar way.

Instructions for replacing the front wheel ABS sensor:

Instructions for replacing the rear wheel ABS sensor:

HOW TO IMPROVE THE LADA STRUCTURE

A D-shaped seal can be used to protect the wiring harness from the environment. We put wires in it and wrap it with electrical tape. We put everything in a corrugation. We glue the cover covering the ABS sensor connector around the perimeter with the same sealant. This will prevent moisture and dirt from entering the sensor and connector area.

Attention! If the ABS fails, the brakes remain operational, but the braking efficiency decreases, which is especially dangerous on how much surface.

The ABS system is important element the whole structure of the car, without which safe movement is indispensable. According to statistics, the reason for a large number of road accidents is that drivers misuse the braking system. In most cases, this problem occurs in winter period time when the road surface is very slippery. Let's consider in more detail the components of the ABS system, and also give advice on what to do if it catches fire bulb ABS.

The main function of the ABS is to control the braking force of each wheel. However, this is done in such a way that the wheels of the car do not lock when braking, but the car stops quickly. Thanks to hard braking, the driver does not lose control over the vehicle.

If anti-lock brake system is missing or out of order, then with sudden braking, the wheels stop rotating or are blocked. For this reason, the vehicle can skid, especially when heavy braking occurs when cornering.

In any case, if the anti-lock system is not working. It is easy to check if there is a problem with the ABS: you need to accelerate the car to 40 km / h and sharply press the brake pedal to the floor. If the vibration of the pedal is not felt, the ABS does not work. The anti-lock braking system allows you to sharply apply the brake and quickly go around an obstacle. Without ABS, you cannot press the brake sharply and at the same time drive around the obstacle, because the car can simply skid.

Main parts of the ABS system

An anti-lock braking system consists of the following main parts:

• Rotation sensors, which are equipped with all wheels of the car.
• ABS hydraulic control unit.
• A mechanism that controls the correct operation of the hydraulic unit.
• ABS light located on the dashboard.

Why is the indicator on the instrument panel on

If the ABS light on the dashboard lights up, the reasons for this may be the following:

1. It lights up every time the car engine starts - this is how the system signals that it is in working order. If the system is fully operational, after a while the light should go out. If there is no ABS when starting the engine, the indicator is most likely out of order.
2. If the light does not go out for a long time, this means that there are problems in the ABS system. The on-board computer, detecting errors, generates a breakdown code, stores it and turns on the warning indicator.

Causes of the ABS error

Why did the ABS light come on when the car was moving? This means that the entire system or its individual parts are not working correctly. Breakage can occur for the following reasons:

• the contact in the connection connector disappeared;
• loss of communication with any sensor, most often due to a wire break;
• breakage of the ABS sensor;
• the crown on the hub is damaged;
• the ABS control unit does not work.

Also, ABS can be covered in a strong contamination of the working surface of the sensor, which is located on the wheel. In this situation, it is enough to wash the car for the ABS indicator to go out.

It should be remembered how long the "iron horse" passed technical inspection at the service station and how exactly the check was done, because many inexperienced craftsmen perform wheel diagnostics by removing the wires from the sensors. After that, would-be experts forget to connect the previously removed wires, so the ABS indicator on the panel remains on.

If there are problems with the control unit, then it will be problematic to eliminate them. It can be detected using the on-board computer, which will show the system error code. Based on the information received, the problem with anti-blocking is calculated. It will not be possible to replace the ABS sensor on your own, therefore it is important to contact a specialist in a car service.

What is the risk of a breakdown of the ABS system

If the reason lies in the burned out bulb of the indicator itself, then there will be no problems. You just have to replace it at the station maintenance or even yourself.

If the ABS signal lights up while driving, it is important not to panic and stop the car suddenly - in most cases it is safe to move on. But you need to remember in this situation that you should not rely on the uninterrupted operation of the anti-lock braking system, as well as automatic traction control and rely on the adequate functioning of the stability control system. Therefore, it is necessary to listen to how the car behaves when driving and whether the braking system works normally. Only after assessing the condition of the car, you can make a decision: go to the car service yourself or call a tow truck.

Let's take a closer look at what you can do yourself if you find a problem with the ABS system:

1. Open the hood and disconnect the battery. To find the electronic control unit, you need to look under the hood. This mechanism It is located in the same housing with a hydraulic modulator - brake force distributor. How to recognize the electrical unit? Connected to the system a large number of brake pipes (most often 6) and wires with a connector. For visual inspection, the connector is disconnected and inspected for the presence of water or mechanical damage to the contacts. If moisture is detected, it is blown or dried.
2. It is important to check the fuses, which should be done first. Several fuses can be connected to the ABS system, which are located mainly in the engine compartment mounting block.
3. Self-identification of problems in the functioning of the ABS is not always an easy task. Automotive specialists also advise inspecting a car lift. In this situation, it is allowed to raise the machine with a jack. The main task is to inspect the wires for damage. Wheel sensor wires are often screwed into the hub. This check will determine if the wires are frayed on the wheel and flew off the mounts.
4. It is also important to check the wheel sensor wires, which can be up to one meter long. Moisture and rust should definitely be removed.
5. If everything is in order with the main components of the car, but the ABS light is still on, then the "iron horse" should be immediately tested at the service station, where experts will try to "throw off" the error on the locking system by simply removing the battery terminal.
6. If none of the proposed methods of putting the display in order helped, you should immediately go to the car service in order to determine and eliminate the malfunction using computer diagnostics.

The principle of functioning of the ABS system is quite simple and clear in terms of self-diagnosis. And today, not many reasons have been identified because of which it can fail. With the right approach, most motorists will be able to independently detect and fix the breakdown. Otherwise, you just need to contact the specialists at the service station.

Before the introduction of ABS in cars in the 70s of the 20th century, they were less safe when compared to today's modern cars. This was especially true of the moment when the driver had to move either on a wet or on a snow-covered, icy road. In those years, old cars were usually equipped with not very high-quality wheels (tires), not entirely reliable rear wheel driveas well as a conventional and simple braking system without any electronics. But today, as you know, friends, everything has changed for the better. These days, most of the drivers do not even think about the modern braking systems on their cars. Today, each of us (drivers) feels confident and reliable while driving a car, even when driving or in particular when it is icy. The point is as follows. Most modern cars nowadays are equipped (equipped) with front-wheel drive, which gives drivers confidence when driving a car. Moreover, these cars are also equipped with the latest modern electronic safety systems that control the grip of the car with the road surface, and excellent modern rubber, which demonstrates on slippery road just some miracles of adhesion to such a track. One of the most important systems in any modern car today is the anti-lock braking system (ABS), which significantly reduces the braking distance of the car and prevents the wheels from locking, which can lead to a loss of traction and, accordingly, further to a skid.

The "ABS" system has already become a standard equipment in the automotive industry; today it is installed on virtually every modern car produced by automobile manufacturers. As we have already written more than once, this "ABS" system consists of several parts, namely, from speed sensors that are installed specifically on the wheels of the car, from the electronic control unit for the anti-lock braking system and also hydraulic valves, which, according to a certain signal from the electronic unit, are here - they also regulate a certain braking force in each wheel without resorting to the driver's assistance (without his participation).

Wheel sensors "ABS" monitor the speed of rotation of each wheel of the car and constantly transmit data to the auto-computer. As soon as system unit "ABS" begins to notice (see) that the wheel stops rotating, then it immediately activates the valves of the hydraulic brake system and it, in turn, instantly begins to reduce the brake pressure in this very wheel. As a result, the pressure brake fluid in the wheel immediately drops and the braking force decreases, which further contributes to the unlocking of the wheel and the return of traction. This process is repeated through the computer of the car several times per second and until the car comes to a complete stop or the driver releases the brake pedal himself.

Each time the ignition is switched on, the ABS control unit and the vehicle computer automatically carry out a self-test of the anti-lock braking system. That is, every time you start the car, an automatic test of the "ABS" system occurs immediately. In the event that during the self-test the auto-computer receives insufficient data from the sensors, from the ABS control unit and from the hydraulic valves of the brake system, the car lights up signal lamp with the "ABS" icon. For example, if the car computer or the same "ABS" control unit did not receive a feedback signal from the hydraulic pump of the brake system or from the same valve installed on each wheel, then the "ABS error" signal will immediately light up on the dashboard (on the panel), - in the form of an icon (indicator).

Pay your friends your attention specifically to the fact, namely, despite the malfunction of the "ABS" system and the appearance on the dashboard of its burning "ABS signal-icon" in the car itself, as a rule, the mechanical braking system continues to work and you can safely without fear of continuing to drive the car, but without this electronic system to help block the wheels during braking. That is, in other words, we can say that if the ABS system breaks down, you can safely use your car. However, in this case, you need to be extremely careful when braking on a wet, snowy or slippery road, as without this "ABS" system, the wheels of your car can periodically block. Therefore, friends, we do not recommend that in the event of a malfunction of the "ABS" system, operate your car without proper repair for a long time. Thus, it should be clear to all drivers that if an auto-computer issues an "ABS error", it is necessary to establish the cause of this malfunction as soon as possible and eliminate it as soon as possible.

Malfunction of the "ABS" system.

And so let's say. In your car, a warning light or icon on the dashboard lights up to warn you of problems with the anti-lock braking system. What should be done in this case?

First, to begin with, you need to make sure that the illuminated icon indicator indicates a problem with the "ABS system", and not a malfunction of the entire brake system of the car.

To do this, you need to listen carefully to your car when braking and turn your attention to the brake pedal. If, when braking, you start to hear extraneous noises (whistling, knocking, squeaks, etc. sounds) or the brake pedal in the car has become too soft (softer than usual), then your task is a direct road to a technical auto center, where specialists must conduct a thorough diagnosis of the entire braking system of the machine. Please remember that all these signs indicate a serious malfunction of the entire braking system of the car, which can lead you to an accident while driving. Therefore, friends, remember that if the brakes of your car become very bad, soft and not quite normal, we do not recommend that you go on a public road with such brakes, as it can be very dangerous. In this case, you need to call a tow truck.

Also, in order to specifically find out that the illuminated icon-symbol "ABS" of the malfunction was the cause of the anti-lock braking system of the car, you also need to make sure that no air has entered the brake system of the car, that the brake pedal on the car is still stiff and has not become too soft, and also make sure that the brake system is not. To do this, you must first check the brake fluid level in the reservoir, and then only all brake pipes and hoses for leaks or breaks.

Among other things, you must remember that when the ignition is on, you should never panic when you see such an illuminated "ABS symbol" on the dashboard. Maybe this is just a common mistake of the car electronics itself. Therefore, in such a situation, it is necessary to turn off the ignition and remove the key from the lock, and then turn on the ignition again and check again if the "ABS symbol" appears on the dashboard (on the panel). Repeat this process several times. It is quite possible that this is really an error of the car computer and after several such switching on and off the ignition, this error of the "ABS" system will simply disappear.

If, nevertheless, after several attempts to turn the ignition on and off, this error of the "ABS" system on the dashboard does not disappear, that is, does not disappear, then you have two options:

First; - go to a car service and conduct a thorough computer diagnostics the whole car. The main feature of the "ABS" system diagnostics is as follows, that is, in the electronic interrogation of the "ABS" unit using special equipment for all kinds of errors in its system.

With the help of such a diagnosis, a specialist will be able to quickly determine the "error code" in the "ABS" system, which specifically led to the appearance on the dashboard of the signal "ABS symbol-symbol".

Also, this very "error code" will give a specific hint where exactly to look for the cause of the malfunction of the entire "ABS" system.

The second option is needed only for those drivers who want to get to the bottom of this very truth on their own and on their own. In order not to use (not use) expensive diagnostic equipment for testing the "ABS" system, you need a service manual for your car (a book on the repair and operation of your car model), as well as a simple car tool that is sold in any auto shop and of course a multimeter high resistance (high impedance). If you cannot find the necessary book for repairing your car model on sale, then please look for it on the Internet or download it to your computer or your smartphone.

We draw your attention to the following, friends, that in some cars you can get direct access to the diagnostics of the same "fault codes" that are stored in the car's computer, and all this without using a special diagnostic scanner. To do this, you need to check each electronic unit of your car (including the "ABS" control unit) using the old proven method, namely, using two simple wires that you must connect to the appropriate connectors electronic systems cars. For example, you can connect these two wires to check the circuit closure in the same "ABS" control unit, for which you need to connect these two wires directly to the connector of the "ABS" control unit and close the wires with a pin or a paper clip. If, after this procedure, the "ABS symbol" error disappears from the dashboard, then the cause of this error is located in the anti-lock brake system control unit itself. In the same way and in the same way, you can connect with a paper clip or a pin and without using wires, other specific and necessary contacts.

If dear motorists, your car is equipped with more modern computer, where the diagnosis of error detection is carried out only by connecting the scanner to the "OBD II" (On-Board Diagnostic) diagnostic port, then in order to establish the reason for the "appearance of the ABS symbol" on the dashboard you only need electronic diagnostics, which you can do either in the technical center, or yourself, but with the help of an inexpensive error scanner you purchased to the "OBD II" port.

Suppose the following, that you do not yet have any information about the errors in the car's computer, which led to the appearance on the dashboard of the "ABS symbol". Do not rush to carry out computer diagnostics. First, check the fuse for the "ABS" control unit yourself. After all, a common cause of malfunctioning of the "ABS" system is the usual fuse of the anti-lock brake system control unit.

And so we follow, you checked the fuse of the "ABS" control unit, which was in working order. What to do now? Now you have to use a multimeter to check the voltage and resistance in all electronic parts of the "ABS" system. To do this, read the operating and repair manual for your car, namely, with all the corresponding reference values \u200b\u200bof voltage and corresponding resistance in the sensors "ABS" and in the electronic unit "ABS".

True, we must not forget to check the main wiring harness, which is connected to the "ABS" control unit, even before that. Carefully inspect the entire wiring harness responsible for the performance of the entire "ABS" system for damage. Also, remove the connector of this harness from the ABS control unit and carefully inspect all pins in the connector for contamination or oxidation. All contacts on the wires in the bundle must be clean. If the contacts need cleaning, use a special aerosol spray to clean the electrical contacts and connectors to take and clean the connector of this contamination.

Also, when inspecting the ABS wiring harness connector pins, pay attention to pins corrosion. Please remember that even microscopic chemicals of oxidation and corrosion can seriously affect the resistance in the electrical circuit of the "ABS" system. As many people know, a small voltage of electricity (millivolts) is transmitted along the wires and even the slightest increase in resistance due to contamination of the connector contacts can lead to wrong work the entire electronic part of the "ABS" system, and also cause an error in this system, which leads to the "ABS" indication on the dashboard.

If the ABS controller looks intact and is operational, and disconnecting the ABS wiring harness connector from the anti-lock braking system did not solve the problem of the burning ABS symbol on the dashboard, then it is time to check the health of the speed sensors wheels that transmit information to the "ABS" control unit. To do this, you must initially measure the resistance of these sensors, checking them with the reference values \u200b\u200bspecified in the repair manual for your car.

If this resistance is within acceptable standards, then proceed to a visual inspection of the wheel speed sensors themselves, the wires themselves suitable for them and the inspection (inspection) of the condition of each axle of the toothed gear (or on each wheel hub) that are installed in the machine on each wheel. As a rule, such sensors related to mechanical sensors were installed on old cars.

Also, today in many modern cars currently used sensors that need electricity. As a rule, ABS sensors are used based on the Hall effect (a semiconductor plate is installed inside the sensor), which, when interacting with a magnetic ring on the wheel hub, record the change in the magnetic field itself and the rate of formation of electrons on the plate inside the ABS sensors.

Unfortunately, not all cars have these "ABS sensors" and the wires through which the signal from the sensors is sent to the "ABS" system control unit are reliably protected from the aggressive environment. Ultimately, they can fail due to damage and dirt on them.

In order to check the condition of the wheel speed sensors and the "ABS" system wires, you must first remove the wheels from the car, namely, alternately raise the car with a jack from the right side and remove each wheel.

This gives you free access to the sensors and wires.

If, when inspecting the ABS wiring harness and wheel speed sensors, you find any damage (or the wheel speed sensor is not securely attached or is loose), then you can assume that you have found the cause of the error on the dashboard, which informed you about a malfunction of the "ABS" system.

But if, when inspecting these wires and "ABS sensors" you did not find any external damage on them, then remove all the speed sensors of the "ABS" system from the hub (or from the axle) and check their resistance, as we said, using a multimeter ( if you haven't done so before). Control values \u200b\u200bof resistance in wheel speed sensors can be found in special books on repair and operation of your car model.

We also advise all car owners from time to time to inspect the wires of the wheel rotation sensors of the "ABS" system, do this even if the car's anti-lock braking system is working properly and the "ABS symbol" icon does not light up on the dashboard. The point is this, all the wires and wheel rotation sensors are located at the bottom of the car and they are constantly exposed to aggressive environmental influences. Remember friends that the main enemy for wires and sensors is salt, which is contained in road reagent, water and snow.

For what reasons is the "ABS" indicator on the dashboard lit, if the sensors and the control unit with the "ABS" wires are in good working order?

If, after testing, you find that all the electronic parts of the "ABS system" are in good working order, and the "ABS symbol" on the dashboard is still lit, then most likely the problem itself is associated with the hydraulic valve system of the "ABS system", which unfortunately not subject to partial repair.