EUR Lada Priora malfunctions and solutions

EUR - what is it?

Electric power steering is a kind of electric motor that helps the driver turn the steering wheel with less effort. The EUR is installed on the steering wheel shaft and, when the engine is running, helps to rotate the steering wheel, powered by electrical voltage.

The main task of the ESD in a car is to reduce the force of rotation of the steering wheel by the car driver.

What it consists of:

• Steering shaft;
• Torsion shaft;
• Electrical engine;
• EUR control unit;
• Motor rotor sensor;
• Torque sensor;
• Circuit breakers;

The components of the EUR include the following elements:

• Steering rack;
• Steering wheel;
• Speed ​​sensor;
• Steering cardans;

All these details directly affect the operation of the electric power steering of the Lada Priora.

How to keep the EUR in working condition longer

Very often the Priora's ESD does not work and fails due to careless driving. In order for the repaired electric amplifier to work as long as possible, you should follow simple rules:

• do not leave the steering wheel in the extreme position for a long time;
• do not make sudden movements with the car when it is in an extreme position;
• when turning a car or parking it, you cannot hold the steering wheel in the extreme position for more than five seconds;
• regular scheduled inspections of the EUR;
• While driving, pay attention to extraneous sounds emanating from the electric booster.

Follow these rules, and you may not have to deal with ESD repairs for a long time.

The entry was made so as not to forget useful information) Not invented by me, but respectfully borrowed from another source)

Diagnostics of EMUR (aka EUR) without a scanner (using the “paperclip” method)

turn off the ignition; close contacts 6 and 7 of the 8-pin connector of the EMUR control unit (CU), located next to the power supply unit; turn on the ignition and read the codes through the flashing diagnostic lamp. If you look at the ECU connector from the wire side (8-pin black connector, 1st pin on the top right near the latch), then from right to left the count goes like this:

1-blue (ignition switch +12V); 2-brown-red (tachometer); 3-gray (vehicle speed); 4-pink-white (EMUR control lamp); 5-yellow-black (K-Line); 6-empty (L-line) 7-brown (mass) 8-empty.

Decoding the code

1 long 1 short System OK 1 long 2 short No engine speed signal 1 long 3 short Malfunction of the torque sensor 1 long 4 short Malfunction of the EMUR engine 1 long 5 short Malfunction of the steering shaft position sensor 1 long 6 short Malfunction of the engine rotor position sensor EMUR 1 long 7 short Malfunction of the vehicle's electrical system (below 10V or greater than 18V) 1 long 8 short Malfunction of the EMUR control unit 1 long 9 short Malfunction of the vehicle speed sensor

Priora EUR control unit

This part serves to calculate the force applied to the steering wheel and the force that the electric motor applies to the steering wheel shaft. The block is also responsible for turning off the power steering at speeds above 100 km/h for a more sensitive understanding of the car.

The EUR control unit on the Lada Priora is located near the power steering electric motor on a special bracket.

Standard electric amplifier - article number and price

On the market you can find geared (outdated) and gearless EPS (electromechanical power steering) for Priora. It is worth concentrating on the second option, there are reasons for this:

Fast request processing: the “intermediary” - the gearbox - disappears - the ECU copes faster with the driver’s commands; More durable. The gear transmission of the gearbox can break at an inconvenient moment, but in a gearless electric power steering system the moment is transmitted directly to the steering rack. The noise level is reduced. The article number of the gearless EUR for the VAZ 2170 Priora is 2172-3450008-02. The price ranges from 20,000 to 25,000 rubles. The cost of a geared EUR is two thousand lower, but is it worth it - to skimp, pay less money, and then deal with frequent breakdowns?

Differences between EUR and power steering

The electric amplifier differs from the hydraulic one in the absence of fluid and the pump necessary to pump this fluid. Also, the hydraulic power steering operates entirely on mechanics, unlike the electric power steering, in which mechanics are involved only in the rack and steering wheel. EUR is much simpler and easier to maintain, but in terms of repairs it is much more expensive.

Advantages and disadvantages of EUR over power steering

Although the EUR is more modern and technologically advanced, it has both advantages and disadvantages over the power steering.

Advantages:

• The simplest design that does not require constant monitoring of the liquid level (dixtron);
• There is no need to service the power steering pump, since it simply does not exist;
• Reduction of force with increasing vehicle speed;
• Ability to programmatically adjust steering wheel force;
• Reliability of the design;
• Compact, no bulky pump in the engine compartment and no extra hoses;
• The simplicity of the steering rack and its reliability, since it is dry and there is simply nothing to leak in it (everyone knows very well about the disease of “wet” racks);

Flaws:

• High power consumption, at some points the electric power steering can take up to 40% of the electrical power of the car’s generator and cause voltage drops in the on-board network;
• Possibility of overheating of the electric motor when driving on a dirt road (track) up to the complete shutdown of the power steering;

As you can see, the more modern power steering has many more advantages, which is why it is gaining great popularity among cars at the present time.

We determine EUR malfunctions on Priora

The most important sign of an ESD malfunction is when a light comes on on the car dashboard, receiving a signal from the ECU. As standard, the domestic Lada Priora has such an icon on the dashboard, made in the form of a wheel and an exclamation mark. When you turn on the ignition in your car, this icon literally lights up for a few seconds, and then goes out when the computer realizes that everything is in order. If something doesn’t work, the signal lights up and stays on until the problem is completely eliminated.

If the light is on, then the best decision in this situation is to undergo computer diagnostics, since the electric power steering is directly connected to the Lada Priora on-board computer. Nowadays, you can easily purchase an individual diagnostic scanner, which is easy to use and you can easily and simply find out the cause of the malfunction in order to independently choose ways to eliminate this very malfunction.

So, experienced drivers recommend carrying out diagnostics; you can do this yourself, having the appropriate device at hand. You will be able to contact the head computer and get all the error codes, and it doesn’t matter whether they are without decryption or with it. If your scanner only gave you codes, don’t despair, everything can be easily found out. It is enough to know that ESD faults will necessarily begin with the symbol “C”, for example, a code such as C1013 means that the voltage in the network is too low, and this is not enough for ESD.

Actually, with this malfunction, it is likely that one of the two existing power wires that go to the power steering has weakened or possibly burned. The wires there are black and red with a large cross-section and they always go into a separate connector on our device, checking them is not difficult. Alternatively, the fuse may be faulty; this problem is generally clear and easy to fix. Another reason when the EUR does not work is when the alternator or battery is faulty. If the reason lies in this, then there is no way to do it without a good electrician.

Fog lights Lada Vesta

Crash test autoreview Vesta

Lada Vesta ground clearance

Technical characteristics of the EUR

Purpose of the unit

Due to the operation of the ESD, the load and force on the steering wheel are reduced when making a turn. The unit greatly facilitates driving, and at high speed it does not allow dangerous maneuvers.

The unit includes the following components:

1. Steering wheel;
2. Column;
3. Shaft;
4. Electric motor;
5. Steering mechanism;
6. Electronic control unit (ECU);
7. Torque sensor.

When turning, the electric power steering is activated. The torque is provided by an electric motor, which is present in the EUR design. The torque sensor measures the indicator and sends it to the ECU. Depending on the angle of rotation, the block calculates how much power needs to be given to the motor. The switch located under the steering wheel contains a device that determines the angle of rotation. The torque and rotation sensors transmit data to the ECU, which “determines” whether the electric motor is running at the desired speed.

On previous generations of VAZ cars, a hydraulic booster was installed; it gave almost the same force in all rotation ranges. As for the electric power steering, the degree of force depends on many factors - the speed of rotation of the steering wheel and its angle, the speed of the power plant, the speed of movement.

Removal and installation

To carry out work on removing and installing the electric power steering on a Priora, you need to prepare a special tool that will be needed during the work process.

You will need:

• Hammer;
• Wedge (a chisel will do);
• Ratchet;
• Ratchet extension;
• Head for “8” and “13” mm;

After preparing the tool, you can begin to work.

Removal

• Disable the mass mark from the battery;
• dismantle the steering column casing;
• Remove the ignition switch by unscrewing the bolts;
• Remove all connectors from the power steering unit;
• We unscrew the steering cardan nut and use a wedge to loosen its engagement on the splines;
• Unscrew the nuts securing the amplifier to the body (4 pcs);
• We remove the structure from the car;
• We assemble in the reverse order;

Repairing the EUR on-board computer

As for the “brain” and internal sensors, the procedure is as follows: to fix broken sensors, it is better to go to a service station, but you can change the computer at home. Tools that need to be used to work with the equipment:

• socket wrench 8;
• socket wrench 13;
• shaped screwdriver.

It is necessary to first remove the steering wheel.

How to repair the electric power steering of a Priora? Initially, the linings located on the steering column are removed. To do this, just unscrew the two screws and unfasten the 2 latches. The second step is to unscrew the bolts, there should be four of them. After this, with a slight movement, the lower part of the lining is separated, and all wires are disconnected. This can be done as follows: press the connectors on the antennae. You can loosen the clamp using a size 8 wrench. Afterwards, two connectors are disconnected from the EUR ECU - this allows you to remove the trim located there.

The nuts located at the bottom do not need to be completely unscrewed; just turn them using a socket wrench. The next step is to get the Priora EUR. If you cannot repair the device at home, contact a specialist. If the operations are performed correctly and there are no results, components may need to be replaced.

Advantages and disadvantages of amplifiers

Lada Priora can be equipped with both a hydraulic booster and an electric booster. Many car enthusiasts increasingly prefer cars with EPS, although it would be more accurate to call it EMUR - electromechanical power steering.

Why is it needed and its device

ESD is an electrical mechanism that reduces the control force with which the driver turns the steering wheel. It turns out that this cunning device takes on most of the effort, leaving the driver responsible for the safety of the maneuver. The design of the EUR is as follows:

• Electronic control unit and electric motor;

Controller and peripherals

• Steering wheel;
• Output/input shaft;
• Studs, nuts, bolts, etc.;
• Bracket;
• Steering rack;
• Connections;
• Steering wheel tilt adjustment lever.

It works like an ordinary electronic mechanism - for example, like a prosthesis: receiving data from sensors about the resistance of the road surface, vehicle speed, crankshaft speed, the force that the driver applies to turning the steering wheel, the “brain”, the electronic control unit, delivers the electric motor to sufficient power to so that the car can be controlled with one finger.

The steering column becomes almost weightless, and does not even give off the vibration familiar to many from prolonged holding in the extreme position.

Methods for determining mechanical damage to electric power steering and steering mechanisms

Mechanical damage is checked only when the EUR as a whole is not functioning correctly, but there are no errors on the on-board computer display. To diagnose mechanical breakdowns, turn the steering wheel in different directions until it stops while the engine is running. Of course, the car must be in one place. If you have to exert significantly more force than usual when turning the steering wheel, this indicates a malfunction in the system and a breakdown of one of the components. The same problem may indicate a failure of other components of the steering system.

To more accurately identify problems, a thorough performance check should be carried out. You will need to drive your Lada Priora onto an overpass, pit or lift, and then carefully diagnose all components of the chassis. It is necessary to check the racks, steering rods and other components, since there is a possibility that the amplifier itself is working, and the signs of malfunction are associated with other problems. To service an electric amplifier at home, you will have to completely disassemble the system, clean its components and put it back together.

Pinout diagram and designations of EUR contacts

Complete failure of the electric amplifier

Despite the fact that the ESD is considered more reliable than the power steering, it still has malfunctions, and since this directly affects safety, repairs should be made immediately.

There are not so many malfunctions that arise with the EUR on the Priora. The first thing that happens is the amplifier stops working completely. Often, turning off the amplifier is accompanied by a corresponding code, which is displayed on the display of the on-board computer, although there are also cases when its shutdown can only be detected experimentally.

Power steering for modern Lada

To do this you need to do:

1. Several turns of the steering wheel in different directions with the engine not running.
2. Then you need to carry out the same operation, but with the car running.
3. If the force required to apply to the steering wheel has not changed, this means that the power steering is not working.

The movement, of course, can be continued even if the amplifier is not working, but it is not advisable; it needs to be repaired as quickly as possible and restored to functionality.

There are times when the amplifier on a Priora turns off along with the speedometer. The culprit is the speed sensor. The fact is that these three elements are interconnected. This scheme allows you to regulate the operation of the electric power steering depending on the speed limit. Repair in this case comes down to checking the functionality of the speed sensor and the wiring going to it, the speedometer and the power steering. If commutation breaks are detected, it must be restored. And when the fault is in the sensor itself, it is simply replaced.

The electric booster may turn off due to low voltage in the on-board network of the Lada Priora. This indicates that the insulation in the wiring may be damaged, causing a short circuit or problems with the generator's performance so it is not producing the correct voltage. The repair consists of checking and restoring the integrity of the wiring, as well as checking and troubleshooting the generator.

Severe contamination of the contact group of the torque sensor installed on the amplifier can also cause a shutdown. Moreover, the on-board computer, conducting self-diagnosis of the system and identifying problems with the operation of the torque sensor due to contamination, can itself deliberately turn off the amplifier. Repair in this case comes down to removing the EUR from the car, disassembling and thoroughly cleaning the contact group. But since the operations to restore the functionality of the electric booster are complex and incorrect assembly and installation of it on the car can affect the correct operation of the steering mechanism, it is advisable to contact specialists to restore the power steering.

But as already mentioned, completely disabling the electric power steering only leads to the need to make more effort when driving, and such a malfunction does not significantly affect safety while driving.

Unpredictable operation of the electric amplifier

It is much more dangerous when the electric amplifier behaves unpredictably. For some car owners, while driving, the amplifier began to work and sharply turn the car to the side, while the driver was driving on a flat road and did not affect the steering wheel. Such situations may be accompanied by jolts to the steering wheel. It turns out that at the most inopportune moment, the electric power steering can knock the steering wheel out of your hands and send the car either into the oncoming lane or to the side of the road.

Steering wheel and dashboard

If such a malfunction occurs, it is absolutely prohibited to continue driving, otherwise, due to this breakdown, you can get into a traffic accident or fly off the road. To continue further movement, just turn off the amplifier. To do this, you need to remove the fuse responsible for power supply to the electric power steering, after which you can continue driving without the amplifier.

The origin of this problem lies in the amplifier itself. Such a malfunction may occur due to the same torque sensor. If the contact group is dirty, this sensor may not correctly perceive the steering position and speed sensor data. In some cases, cleaning the contact group can restore the functionality of the amplifier. But it is quite possible that such an operation will not bring a positive result.

To eliminate the breakdown, most likely, you will have to completely replace the electric amplifier. It is not recommended to carry out replacement in a garage environment. To do this, it is better to contact a specialized service station. After replacing the electric booster, it is advisable to perform adjustment work on all components of the steering mechanism.

Malfunctions and their symptoms

Undoubtedly, the electric booster is a more reliable unit than a device running on hydraulics, but malfunctions also appear in the power steering. If they are detected, repairs must be carried out immediately, since the safety of the driver, his companions and other road users depends on the operation of the amplifier.

Complete failure of the EUR

As practice shows, this unit does not have many faults; breakdowns occur in the same parts. The first thing worth considering is the complete failure of the ESD. When you turn off the amplifier, you need to check the on-board computer screen; most likely, you will see a code there indicating a malfunction in the unit. But sometimes it is possible to determine when an amplifier is turned off only in practice.

We perform the following actions:

1. Turn off the engine and turn the steering wheel in different directions several times;
2. We repeat these steps, but with the engine running;
3. Has the steering effort changed? This means the node has completely shut down.

Even with the ESD not working, you can continue driving, but this is not recommended. The driver needs time to get used to driving with the help of an amplifier. It is better to immediately begin diagnostics and determine which component requires repair or replacement.

Sometimes the amplifier and speedometer stop working at the same time. The cause of this defect is a speed sensor that has failed. Taking a look at the electrical diagram, you will understand that these three elements are connected. The torque sensor supplies data to the control unit, it compares it with speed and determines the force. If the cause is the speed sensor, then the repair consists of checking the wiring that leads to this element. It is also worth checking the wires connecting the sensor to the speedometer and power steering. If there are no breaks in the switching, then the sensor should be changed.

Low voltage in the car network can also lead to the ESD turning off. Faults should be looked for in the wiring insulation. If it is damaged, short circuits will appear in the network. Also, violations in insulation lead to malfunction of the generator. To troubleshoot the problem, check the wiring and generator. The torque sensor contains many contacts, which, if heavily soiled, help turn off the power steering. In this case, repair means disassembling the unit and cleaning the contacts of the torque sensor.

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Unpredictable steering behavior

The driver is driving on a flat road, the position of the steering wheel does not change, and suddenly the car turns to the side. Such unpredictable behavior of the power steering requires urgent diagnosis, since at the most inopportune moment the electric power steering of the Lada Priora can send the car to the side of the road or into the oncoming lane. In such a situation, you should stop driving and turn off the amplifier. To do this, we need to remove the fuse, which is responsible for supplying voltage to the amplifier.

To remove this fuse, you need to do the following:

1. The mounting block cover is located at the driver’s left foot;
2. We turn the clamps and unclip the fasteners;
3. You will find the block where the required fuse is located near the expansion tank;
4. Feel free to take out fuse F5 (50 A) - it is responsible for providing the power supply circuit to the power steering unit.