How to change the abs sensor on a Priora

practical guide

Anti-lock braking system

1. We prepare the car for work.

2. Remove the rear wheel.

3. Using a TORX E8 socket wrench, unscrew the sensor mounting bolt.

4. Remove the sensor from the brake mechanism shield. Continue reading →

1. We prepare the car for work.

The following procedure is not required to replace the right wheel speed sensor.

2. Remove the air filter.

3. Using a thin slotted screwdriver, press the latch and disconnect the sensor wiring harness block (the block is secured in the front part of the left side member).

4. Push down the pad lock Read more →

To check the technical condition of the anti-lock brake system (ABS), a warning lamp is installed on the instrument panel. An ABS malfunction may be caused by a failure of the wheel rotation sensors or a malfunction of the hydraulic valve block itself. If the ABS fails, the braking system remains operational, but braking efficiency is reduced, which is especially dangerous on slippery surfaces.

If the lamp lights up, you must contact a service station as soon as possible for diagnostics and repairs.

The abs sensor of a Priora car is placed near the wheels. It comes in front and back. The ABS unit is placed near the engine on the right, if you open the hood and stand in front of the car. When AbS (ABC) lights up on the panel, it means there is a problem with the system. Why do cars need this system? Abs affects the braking of the car, Priora with this system brakes 2 times faster than without it. The wheels brake in small portions, measured by a computer. Initially in 2008 there were cars without it. Read the article to the end and find out what the error is, what it is responsible for and why the ABS lights up and does not work. Priora has sensors and an ABS unit. Failure of any spare part leads to problems. On the Prior, there are 18 errors belonging to the braking system.

The appearance of an icon on the dashboard indicates an error occurring in the operation of the vehicle. There are serious errors on the Priora, if they occur, you should not tempt fate and move on, but there are errors that can be postponed. For example, the ABS system is considered very valuable for a modern driver in a car.

The Priora's ABS system saves you during unexpected and sudden braking and makes the process itself more efficient, reducing the braking distance. Therefore, when the ABS light is on on the Priora’s dashboard, strange feelings of uncertainty arise - knowing that the road situation can be so unpredictable that you will have to brake sharply, you involuntarily have to look for the reason why the icon appeared on the dashboard.

As in many systems, this behavior of the car's control unit may result in the ABS sensor on the Priora having to be replaced. A large system with a fairly simple device is worth checking - for your own safety.

How to check the ABS sensor with a tester and a multimeter for functionality

A modern car is now equipped with a variety of active safety systems, the list of which is growing every year. These also include a system to prevent wheel locking during braking - ABS (Anti-lock braking system).

ABS is one of the very first safety systems that began to be used on a car, and it is now found on almost all cars, from budget categories to premium ones.

Let's briefly consider the purpose of ABS - this system is needed so that the wheels do not lock during braking, but continue to rotate, albeit at a slower rate.

Thanks to this, the grip of the wheel on the road surface is not lost and the likelihood of the car skidding is completely eliminated, the car remains fully controlled by the driver.

ABS has been used in vehicles for a long time and has proven its effectiveness more than once.

This system works simply. There is an electronic unit that controls the deceleration rate of each wheel. And if one of them stops faster than others, the block reduces the force of fluid pressure in the brake caliper on this particular wheel, that is, the brake mechanism begins to act less.

You can read more about the ABS device and other information on this system here https://autotopik.ru/obuchenie/467-sistema-abs-avtomobilya.html.

What is the ABS sensor for?

It is stated above that the ABS unit, popularly called the “brains” of the braking system, controls the speed of rotation of the wheels, so the design of this system could not be done without sensors.

They are the “sense organs” of this system and based on their readings the ABS functions.

The first anti-lock braking system used only one sensor, which was installed in the axle of rear-wheel drive cars.

But as ABS has improved, their number has increased; modern cars already use 4 sensors. This allows the system to monitor the rotation speed of each wheel individually.

Types of sensors

There are three types of such elements, differing in their operating principle. The most common passive sensors are induction type.

The essence of their work comes down to a change in voltage due to the influence of a magnetic field. Their main disadvantage is the inability to determine the speed of rotation of the wheel at very low speeds.

The remaining two types are active.

One of them is magnetoresistive (rare). The principle of its operation is based on the magnetoresistive effect - the property of a semiconductor to change the trajectory of electrons when exposed to a magnetic field.

The second type of active sensor uses the Hall effect, in which electrons on a semiconductor wafer move to its edges when the magnetic field changes.

Sensor Features

There are several significant differences between passive and active types. They are called passive because they do not require voltage to operate; such a sensor itself generates electrical impulses, to which the electronic unit reacts. Active elements require voltage to be applied to them.

Passive elements are very simple in design and are very reliable. That's why they are so common, despite their shortcomings.

Active types of sensors use microcircuits in the design, which complicates the element and makes it more vulnerable. But they are highly accurate and do their job even at low speeds.

Since all types of sensors operate under the influence of a magnetic field, it alone is not enough in the design; another element is needed to which it would react.

The induction (passive) type uses a ferromagnetic alloy pulse gear ring mounted on the drive hub or shaft, as well as on the steering axle. Previously, it could also be mounted on the bevel gears of the main drive.

In active types, a magnetic pulse ring is used. In the case of a magnetoresistive sensor, this ring is divided into alternating sectors with permanent magnets of different polarities.

POPULAR WITH READERS: Recommendations for replacing front brake pads

But the Hall sensor uses a regular magnetic ring, without any sectors, integrated into the wheel bearing.

Inductive type element design

Since inductive sensors are the most common, their design will be considered in the future.

Such a sensor consists of an inductive coil, inside of which a magnetic core is placed. It is installed next to the toothed impulse ring, but so that there is a certain gap between them.

When the wheel rotates, the ring teeth pass through the magnetic field created by the core, which affects the magnetic flux, causing the alternating voltage value in the coil winding to change.

As a result, the speed of rotation of the wheel, and with it the pulse ring, affects the frequency and amplitude of oscillations of the output voltage on the coil. These parameters are fed to the “brains”, as a result of which they estimate the speed of deceleration of the wheel.

Problems with at least one of the ABS sensors can lead to a complete shutdown of the system. And although the braking system on the car will work, you can forget about the braking efficiency and safety that ABS provided.

Causes of sensor malfunction

The induction sensor is characterized by its simple design and high reliability; malfunctions with it occur very rarely. The problem most often lies in the wiring through which signals are sent to the control unit.

Since the sensors and their wiring are located directly next to the wheels, over time the circuit may break or short out. Often, sensor failures occur due to oxidation of the contacts.

Due to the fact that after turning on the ignition on a car, ABS always undergoes self-diagnosis, during which the condition of all elements of the system is assessed, it is quite simple to identify problems with the sensors; if they occur, the warning light will constantly light up on the dashboard.

In total, there are 4 types of system behavior when a malfunction is detected:

Self-diagnosis detects an error and ABS is disabled. This may be a sign of an error in the control unit, or a break in the wiring coming from the sensor;
The system undergoes diagnostics, during which no problems are detected, but after this the ABS is turned off. This result usually results from problems with the wiring going to the sensors (oxidation, open circuit, short circuit, etc.);
Self-diagnosis detects an error, but the system does not turn off and continues to operate. This usually indicates a break in the wiring on one of the sensors;
ABS does not turn on. This can happen due to a broken wiring, or because the impulse ring is damaged, chipped or broken. This result can also be produced by a heavily worn hub bearing, which is why there is significant play in it.

Standard sensor and ABS unit - article number and price

The anti-lock braking system operates the rear and front wheels. It contains several brackets, brackets, and other fasteners that ensure accurate operation of the ABS and hydraulic unit damper (article 11180353832400, price - about 30 rubles). But only three items are considered the main ones in ABS:

ABS control unit (“brain”) - article number 11180353801001, cost - about 10,000 rubles; Front wheel speed sensor - catalog number 11180353835000, cost - about 1,000 rubles; Rear wheel sensor - catalog number 11180353837000, cost - 1000-1200 rubles. Often, to solve the problem, you only need to buy an anti-lock sensor from Priora, so the scale of financial costs is not as huge as it seems at first.

ABS device on Priora

The main task of ABS is to prevent the wheels from locking during braking. To fulfill its task in Priora, the anti-lock braking system works like this:

At the moment of braking, the ECU receives data from ABS sensors that read the speed (they are located behind the hubs).
The anti-lock braking system ECU is a unit with internal brake fluid pressure valves and an electric return pump. Its location is the front left side member.
When the sensors transmit data about a sharp jump - instantaneous braking of the wheels - the fluid pressure is gradually released using valves.
A malfunction of any system leads to the transmission of an error signal through the computer, which appears to the driver as a “burning ABS on the dashboard.”

DIY ABS diagnostics

A car's Anti-lock Braking System is a system that regulates the brake fluid pressure in the brake circuits, which helps prevent the wheels from locking during braking. In other words, this system prevents skidding, which provides the following benefits:

Increasing vehicle stability.
Reducing braking distance.
Saving rubber and preserving the studs on car tires.

In addition to its primary function, anti-lock braking system sensors and valves are used for many other vehicle systems. For example, exchange rate stability system or emergency braking assistance system. The stability control system brakes certain wheels during sharp turns or drifts, which significantly improves safety performance. Brake Assist keeps the brake pedal depressed until the vehicle comes to a complete stop.

How the anti-lock braking system works

How to diagnose ABS yourself? — to answer this question with confidence, it is important to know the structure of the system itself. To do this, let’s look at several individual parts of it:

Speed sensors. Sensors are located near each wheel of the car. They transmit information about the rotation speed of each wheel to the ABS control unit.
ABS control unit. The control unit receives signals from speed sensors, analyzes the situation, and, in the event of a wheel lock, transmits a command to the hydraulic control unit.
The hydraulic control unit, having received a signal about a blocked wheel, closes the brake fluid channel going to this wheel.

The result is that as soon as the wheel is locked, the system “releases” it. Once this happens, it is blocked again. All this happens with high frequency, and as a result, the wheels rotate at maximum effort, but without switching to skidding.

DIY ABS diagnostics

The very first sign of a malfunctioning ABS system is a light on the dashboard. After it lights up, it is important to immediately make a diagnosis. Let's consider the actions that need to be taken if the ABS malfunctions:

Check the fuses and relays of the anti-lock braking system control unit.
Compare the tire pressure - it should be the same everywhere.
Examine the rotor of each sensor for contamination.
Use a tester to measure the resistance in each of the sensors with the ignition on. Lift the wheel on a jack and rotate it and observe the changes.
Check the integrity of the wires coming from the sensors to the control unit.
Check the integrity of the wires going to the ABS hydraulic unit.

The best diagnostic option would be to check by connecting a laptop or smartphone to the diagnostic connector - this will save a lot of time and instantly determine the cause of the breakdown.

ABS Lada Vesta error codes and their interpretation

Diagnosing ABS yourself is a rather difficult task if you do not have diagnostic equipment (cable, laptop, and software). If you have the ability to read errors, then by comparing their codes with the description, you can much faster determine the cause of the malfunction. The following are the errors that “light up” the anti-lock braking system malfunction light:

U0121 - no data from the ABS system controller
U0122 - no data from ESP system controller
U0415 - incorrect data from the ABS system controller
U0416 - Invalid data from the ESP system controller

In most cases, the absence of data from the controller indicates a malfunction. If the diagnostics indicate errors U0415 or U0416, then there is a high probability of sensor malfunction or damaged wires. Also, do not forget that with different tire pressures, the control system may receive incorrect data from the controller and indicate the last two errors.

Basic malfunctions of the ABS system

Any driver who has ever had an ABS light come on in a Priora will tell you about the sensor. But it could be worse - if the ABS in Priora does not work. There are several options in which to look for the source of the problem:

wiring damage;
mechanical damage to the brake fluid pressure valve block;
failure of speed sensors.

The first thing you need to do when you see the light (ABS lights up) is to read the error symbols using a special diagnostic scanner. Each item in the ECU is indicated by a corresponding code:

C0040 – the speed sensor (DSC) of the right front wheel is faulty;
C0035 – DSC of the left front wheel is faulty;
C0050 – DSC of the rear right wheel is faulty;
C0045 – DSC of the rear left wheel is faulty;
C0065 – front left valve (intake);
C0060 – front left valve (exhaust);
C0075 – front right valve (intake);
C0070 – front right valve (exhaust);
C0085 – rear left valve (intake);
C0080 – rear left valve (exhaust);
C0095 – rear right valve (intake);
C0090 – rear right valve (exhaust);
C0161 – the braking signal does not turn off;
C0121 – power to the valves does not turn on;
C0110 – electric return pump.
C0550 – error in the “brains” - ECU;
C0245 – error in receiving data from sensors;
C0800 – power surges.

The solution may be simpler: an ABS sensor is installed under the fender liner. Dirt often gets into this area; an unprotected piece of wiring near the DSC connector can be damaged. Replacing it will help.

Replacement

Replacement is carried out using a lift or on an inspection pit. Regardless of the location of the parts, we will need the same set of tools. It includes Phillips and flat-head screwdrivers, a deep socket for 7, long-nose pliers and pliers, spanners for 17 and 13. You may have problems dismantling the rear drum, so prepare a socket for 30 in advance. It is recommended to purchase a wrench for the “seventh” head .

Rear pads

We lift the rear part of the Lada Priora and place additional supports. We remove the drum - it is held in place by two pins, which are shown in the photo below;

If you cannot install the drum after installing the new components, you will need to loosen the handbrake cable. You will find it under the bottom of the Priora.

Front

Before removing the front pads, it is necessary to pump out some of the brake fluid if it is at the MAX level. This can be done using a syringe. Also remove the front wheels.

Using pliers, it is necessary to bend the edges of the locking plate;
Now we have access to the bolt - unscrew it with the 13th key. If the bolt rotates, tighten it with a 17 key;
Raise the caliper body and remove the front brake pads from the guide mounts;

Replacing the ABS block

For repair you need to prepare:

The procedure for working with Priora is as follows:

Stop the car and raise it. Disconnect the minus from the battery.
Drain the brake fluid from the cylinder brake hose.
Unscrew the brake pipes connected to the block. There are 6 of them in total.
Unhook the power lock and disconnect the wires.
Unscrew the nuts fastening to the car body.
Slowly pull the block and remove it.
Install the unit by connecting everything in reverse order. Don't forget to bleed the brake system.

Preparing to replace the brake fluid of a car with ABS: conditions and necessary tools

When servicing a vehicle's deceleration system, free access to the working cylinders of each wheel is necessary. Therefore, the most suitable place for work is an inspection ditch or overpass.

When performing the procedure, you will need an assistant and a set of equipment:

set of open-end wrenches;
a large-volume medical syringe and a hose about 10-15 cm long corresponding to the diameter of the tip (an alternative is a pear);
container for extracted brake fluid;
tube 20-30 cm long; diameter – slightly smaller than the diameter of the fitting on the brake cylinders (to ensure tension).

Replacing the ABS sensor

To replace the anti-lock braking system sensor on a Priora, do the following:

Raise the car. Hang up the wheel. The ideal position is on a car lift. First remove the negative terminal from the battery.
The wheel behind which the faulty sensor “hides” is removed. To do this, working in a circle, smoothly, one by one, unscrew all the bolts and pull the wheel towards you.
Behind the hub you will see the DSC mount: unscrew the screw that secures it using Torx T30.
Disconnect the wiring harness.
Replace the ABS sensor and reassemble everything in reverse order.

What is ABS

The anti-lock braking system was developed when it became clear that when the wheels suddenly jam, the car loses stability and is difficult to control. Moreover, the quality of braking did not improve, and the car was pretty much carried off the road. Therefore, a system was developed that, by regulating the pressure in the brake system pipes, allows the wheels to turn slightly. This significantly improves vehicle dynamics, allowing the driver to control the vehicle more confidently. But despite its apparent simplicity, this is a rather complex process that requires the coordinated operation of many mechanisms included in the anti-lock braking system. If any of the components fails, a warning lamp lights up on the instrument panel.

ABS device on Priora

Like most modern car systems, ABS is computer controlled. But in addition to the electronic control unit, it also includes several sensors and actuators. The entire system consists of several elements.

Electronic control unit (ECU).
Sensors on wheel hubs 4 pcs.
Brake fluid pressure valves in the system 4 pcs.
EVN (Electric Return Pump).
Warning light on the instrument panel.

Despite all its apparent simplicity, this is a rather complex, high-tech system. Each sensor transmits data on the rotation speed of the Priora wheel to the electronic control unit. Based on the data received, the control unit sends a signal to the brake system valve, which, when you press the brake pedal, releasing pressure, prevents the wheels from completely locking and starting an uncontrolled skid of the car.

Anti-lock brake control unit in hydraulic unit

Structurally, on the Priora, the ABS ECU is mounted together with the EWH and valves that regulate the pressure into a single unit - the hydraulic unit. It is located on the front left side member of the vehicle. The hydraulic unit is connected to the entire system by a common wiring harness. It includes pipes for supplying brake fluid to the working cylinders. An EWH is also installed here, increasing the pressure in the system.

Wheel hub sensor

The sensors that supply wheel speed data to the control unit are made on the principle of a Hall sensor. By the way, most rotation sensors use exactly this principle: changing the voltage on the semiconductor of the sensor, depending on the passage of a control point on the rotating disk near it. It is in correlation with the signals from the ABS sensors that the control unit manipulates the valves.

ABS malfunction warning lamp on the Priora instrument panel

What Priora drivers talk about – “the ABS sensor has come on” – is in fact a warning lamp for the serviceability of the anti-lock system. When the ignition is turned on, the orange “ABS” inscription will light up on the dashboard for about three seconds. If the system is working properly, then after three to four seconds the light will go out. In general, the principle of signaling from the “ABS sensor” is the same as from the warning lamp of the main ECU of the car, the well-known “check anger”.

How to disable abs on a Lada Priora with your own hands: video instructions - Website about the domestic auto industry

15.11.2019

The anti-lock braking system is an integral option of any modern car from economy to premium class. The ABS system allows you to drive a car comfortably and safely on any surface, even the most difficult.

During the operation of the car, the driver may encounter the problem of a non-functioning anti-lock braking system (ABS) and, as a result, ineffective braking of his car. In this case, the ABS sensor may need to be replaced.

Depending on the age and condition of the vehicle, replacing an ABS sensor can be quite a labor-intensive process.

First, you need to study the available technical documentation regarding the operation of the ABS on a specific car model. On VAZ cars, the ABS system consists of the following parts:

ABS activation sensors, 4 pcs. (one for each wheel);
ABS control unit;
Hydraulic pressure modulator.

ABS control unit ABS sensor ABS pressure modulator

By the way, having such a set of spare parts, you can install an anti-lock braking system even on those VAZ models that do not have such a system.

Installing ABS on a VAZ is one of the best ways to improve the vehicle's handling and safety. Let's consider the installation process (you will also need new calipers, brake pads and outer CV joints; these parts will fit from Lada Priora).

Bleeding ABS brakes is the correct procedure on Priora, Grant and other car models

Bleeding ABS brakes is essential for safe vehicle operation. After replacing the brake fluid, remove any remaining air from the system. The procedure for bleeding brakes with ABS confuses many drivers, since the process differs from that on cars where this system is not provided.

Have you ever needed the help of a car lawyer?

It is no more difficult to bleed a brake system with ABS than a conventional one. The main difference lies in the accumulator and valves, from which it is not so easy to remove air. However, if you have certain knowledge and skills, it is quite possible to bleed ABS brakes yourself, without the help of specialists from a service station.

Differences between ABS brakes

The main difficulty lies in ignorance of the nuances of operation and the main differences from the same procedure on conventional brakes.

Different car models have their own types of ABS, the design of which differs from each other. This leads to the fact that each brand of car has its own nuances of the system bleeding procedure.

Bleeding brakes with ABS has three main differences from conventional ones:

the pipeline system in the presence of ABS is under increased pressure;
During the procedure, constant monitoring of the brake fluid level will be required;
the pump runs for no more than 10 minutes.

If you do not control the brake fluid level in the system, it will reach a critical minimum and the drive pump will begin to pump air.

This will quickly damage the device.

If the pump runs longer than the set 10 minutes, turn off the ignition and allow the unit to cool for 10-15 minutes.

How to properly bleed the brakes

First of all, look in the car manual to see in what sequence the pumping is carried out. If no recommendations are given, then the procedure is carried out in the form of English Z.

What you will need

You should invite an assistant who will press the brake pedal on command.

A rubber hose, a set of spanners, brake fluid and a container for draining it are also prepared.

Step by Step Actions

The nuances of pumping depend directly on the ABS model. The location of individual components and the presence or absence of additional modules affect the order of the procedure.

The preparatory stage is the same regardless of the car brand. Turn off the ignition and press the brake pedal intensely several times.

Pumping using the example of Lada Granta

The car is placed on an overpass or driven into a pit. This is necessary so that you do not have to remove the disks for free access to the working surface. Next, turn on the ignition to open the solenoid valves. Start the procedure with the right rear wheel.

To bleed the brakes you need:

Disconnect the wires from the tank cap;

pour brake fluid into the reservoir (as much as will fit);
remove the cap;
use a spanner wrench to loosen the tension on the fitting;
the prepared hose is connected to the tip of the fitting;
place the second end of the hose in a container for waste liquid;

press the brake pedal several times;

fix the pedal in the lowest position and hold it;
use a key to open the fitting;
wait until the liquid has completely drained (at this moment the brake pedal will “fall” to the floor);
close the fitting;
pump the pedal again and repeat the procedure until the liquid flowing from the hose no longer contains air bubbles;
tighten the fitting;
remove the hose;
reinstall all parts.

Source: https://vagflash.ru/vaz/kak-otklyuchit-abs-na-lade-priora-svoimi-rukami-videoinstruktsiya.html

Anti-lock braking system malfunctions

All Priora ABS malfunctions can be divided into two categories. Malfunctions of the electronic part and malfunctions in the field of fluid mechanics. That's how they should be considered.

Electronic failures

This is a failure of electronics-related components:

breaks in the electrical wiring harness;
failure of rotation speed sensors;
break or short circuit of the control valve activation coil;
failure of the return pump electric motor;
valve activation relay failure;
program failure, or failure of the ABS control unit.

ABS malfunctions in the field of fluid mechanics

In this case, the most typical failures are leakage of oil seals in various connections and assemblies. Deterioration of working surfaces on disks, and as a result, a change in the distance between the sensor and the readable surface. System valves jamming. Clogging of hydraulic drive pipes and breakdown of the working part of the return pump.

ABS fault detection

The serviceability of the ABS system in the Priora, like in any car, is a very important issue. It is very convenient that the slightest malfunction in its operation will immediately be reflected on the dashboard. The ABS warning light will come on or it will not go out after the required time after turning on the ignition.

There's no need to think twice about it. You urgently need to go for computer diagnostics to a decent service station. Modern Priora ABS ECUs have access to a diagnostic connector. They are perfectly diagnosed by both portable portable scanners and stationary motor testers. Since all ABS electronics are very closely connected with the mechanical part, most breakdowns in this area can be determined by an experienced diagnostician by scanning the ECU.

For example, the operating valve is jammed in one of the directions. What happens: the coil, figuratively speaking, tries to influence him, but he doesn’t move. The computer, noticing a load violation in the circuit, will immediately give a signal. The “ABS sensor” will light up. When connected, the technician will see the direction that needs to be looked at and quickly fix the problem.

Features of diagnostics of ABS Priora

Some scanners that read faults recorded in the ECU produce only alphanumeric codes, so for particularly meticulous car enthusiasts it makes sense to have on hand the decoding of these codes for the VAZ Priora:

C0035 - malfunction of the left front sensor;
C0040 – the same for the front right;
C0045 – rear left malfunction;
C0050 – the same for the right rear;
C0060 – failure of the left front exhaust valve;
C0065 – front left intake valve failure;
C0070 – malfunction of the front right exhaust valve;
C0075 – malfunction of the front right intake valve;
C0080 – rear left exhaust;
C0085 – rear left inlet;
C0090 – rear right exhaust;
C0095 – rear right intake valve;
C0110 – return pump circuit malfunction;
C0121 – failure in the relay circuit for turning on the supply voltage of the valves;
C0161 – malfunction in the brake light circuit;
C0245 – incorrect reading of rotation speed;
C0550 - ECU malfunction;
C0800 - voltage mismatch in the ABS network.

This list allows you to find a fault, even if a simple scanner for a Priora produces only codes, and find out why the “ABS sensor came on.” Still, it is worth remembering that it will be more pleasant for the technician to hear the correct wording - the anti-lock system malfunction lamp is on.

The video below shows the operation of ABS Priora: