Audi A4 what boxes were put. Choice of motor and gearbox A4. CVT design features

More and more popular among motorists. If abroad the concept of "variator" does not raise any questions, then domestic motorists are not used to cars with this type of checkpoint. Therefore, now we will tell you what a CVT on the Audi A4 is - you can also evaluate the reviews of other motorists in this article.

The main advantage of a variator gearbox (hereinafter referred to as CVT) is the ability to efficiently use engine power, compared to other types of gearboxes. Russian and Ukrainian motorists are more likely to switch to cars with CVT, the economy of gasoline, the absence of jerks when driving and other factors provide a high level of comfort.

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What type is the A4 and A6?

As mentioned above, the popularity of CVTs is growing, vehicle manufacturers more often install their own production CVTs on their cars. Thus, the manufacturer installs Multitronic variators on Audi A4 and Audi A6 cars. This type of gearbox is a continuously variable transmission.

CVT Multitronic consists of:

• multi-disc "wet" clutch;
• planetary box device;
• intermediate gear component;
• directly variator transmission;
• top speed;
• differential;
• gearbox housing.

This type of CVT is a V-belt, and we note that Audi was the first to use a metal chain in its gearboxes. Such engineering solution made it possible to increase the range of gear ratios. As a result of the operation of the links different sizes, in the CVT, a reduction in transmission noise has been achieved as a whole.


According to the manufacturer, the operation of this type of gearbox allows for maximum dynamism when driving a vehicle, a high level of fuel economy by the engine. What can we say about comfort. The consumer properties of these CVTs are quite high, and they are installed on premium cars "Audi A4" and "Audi A6". For these types of transport, the manufacturer installs the CVT "Miltitronic 01J" model.

Is this variator subject to repair and where to carry it out?

Not everything can be perfect as we would like. As the saying goes, "there is always a fly in the ointment in a barrel of honey." We are talking about the electronic unit - its location in the CVT unit has one huge drawback. During the operation of the CVT, heavy loads are placed on the unit. This is due to heating transmission fluid... Therefore, the electronics unit breaks down more often.

In some cases, even 80 thousand kilometers for a block can be "lethal". If you contact the manufacturer with such a problem, he will say one thing: "it is necessary to replace the electronic unit." You will not only waste a lot of time, since such a device, as a rule, is out of stock and ordered from abroad, but also a lot of money. But, if the car is still under warranty, then the dealer can change the electronic unit for free.

This type of breakdown is the most common, it can be called a disease for Multitronic variators. The metal chain breaks less often. But even in this case, the official dealer will not carry out repairs, but will offer the owner of the car to replace it.

You can contact specialized service stations that repair control units. Diagnostics on the computer shows a list of errors in the event of a unit failure:

• 17105 P0721 or 17106 P0722 - the output speed device is out of order - in this case, the block signal is incorrect or completely absent;
• 17114 P0730 incorrect gear ratio of the block;
• 17134 P0750 - the ABS / EDS device is out of order;
• 17137 P0753 - no electrical circuit signal;
• 18201 P1793 or 18206 P1798 - the output speed device is out of order - in the event of such a breakdown, the signal is incorrect or completely absent;
• 17090 P0706 - the controller position device has failed - an incorrect signal is recorded;
• 18226 P1818 or 18221 P1813 - electrical circuit malfunctions were recorded.

The above errors appear like this:

• the transport goes in jerks with an increase in revolutions;
• during gear shifting, the car jerks;
• from time to time, the impossibility of turning on the reverse gear appears;
• sometimes, especially for the Audi A6, the car cannot be removed from position P (parking mode).

If you are faced with such problems, then you have only two choices - go to the dealer and pay a lot of money for CVT repairs or go to a specialized service station and also pay money, but an order of magnitude less. Self repair at home it is not allowed, because for this you need to have at least the necessary knowledge and expensive equipment that is not sold in stores.

The electrical box itself is located behind the back cover of your CVT. But keep in mind - if this device is being repaired, you will also have to spend money on transmission oil. In no case is it allowed to fill in a fake or counterfeit, so you will have to purchase original products. Otherwise, forget about the normal operation of the gearbox. Liquid marking G 052 180 A2 (G052180A2) can be purchased from your dealer or ordered online.

Nowadays, there are many types of expensive and quality oils but only the original is needed. Of course, the fluid can be good, but the lubrication and viscosity characteristics should be as required by the manufacturer. Otherwise, the mechanical part of the CVT will fail earlier and repairs will not help here.

Unlike the Audi A6, in the fourth modification, the main bias was made for a continuously variable variator and an automatic type of transmission. Classic mechanics are used less frequently.

In general, the owners' reviews about the Audi A4 are positive. There are no particular complaints about the build quality and the operating time. The most frequent calls to the service station are associated with planned prevention, replacement transmission oil.

What gearbox is installed on the Audi A4

What is the real fuel consumption for an Audi A4 with a gearbox

Indicators are given according to the average calculation. For each of the modifications can be changed.

Typical problems of the Audi A4 gearbox, at what mileage occur

Self-diagnosis without special equipment is not always effective. Sometimes, the defect is located inside the box body, contact the service station specialists for help. The nature of mechanical faults is not as destructive and costly as that of an automatic machine, a variator.

To check the oil level, unscrew filler plug on the checkpoint housing. The level is sufficient if the grease starts to flow out. Otherwise, fill up the missing amount.

You do not need to ignore the dashboard signals. Malfunctions require prompt intervention of the workshop master. Use a portable diagnostic scanner for decryption.

Audi A4 vehicles are equipped with digital sensors that monitor online technical condition aggregates. The current information is displayed on the dashboard display. As soon as the lamp comes on, be sure to turn off the engine, check the oil level, traces of depressurization, mechanical damage.

DSG - robotic version of the Audi A4 gearbox

Repair or replacement of gearboxes

We carry out comprehensive diagnostics in a technical center using digital equipment. We analyze the data obtained, evaluate the general condition of the unit, the nature of system errors, and the presence of defects. The master draws conclusions about the suitability of the checkpoint for further use.

In case of mechanical damage to the case, defects, depressurization, we carry out the replacement modularly, it is inexpedient to restore the box in stages.

What kind of oil to fill in the Audi A4 model: on a synthetic basis, viscosity class 75W - 85 (90, 95), classification according to API SL / CF.

Diagnostics of the Audi A4 gearbox

The cost of a new and used box on the Audi A4

Cars with CVT transmissions have recently become more popular among our compatriots. This type of gearbox is relatively new, so not every motorist knows about the device and the benefits of using such a unit. What is the Audi A4 variator, what are its design features and disadvantages, we will tell you in this article.

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What kind of variator is used on Audi?

The first manufacturers to equip their vehicles with variable speed transmissions (CVTs) were Volkswagen and Audi. Audi models The company equips A4 and A6 with Multitronic transmissions. This type of gearbox belongs to continuously variable transmissions. The consumer characteristics of the Multitronic are quite high. The model of the check point "01J" is installed in A4 and A6 cars.

Gearbox CVT Multitronics 01J

CVT design features

If we talk about the design, then the main constituent elements of CVTs on Audi are as follows:

1. Two wet multi-disc clutches. They are used to disconnect power unit with transmission. According to the clutch device - forward and reverse friction clutches. By design, these elements look similar to devices used in conventional automatic transmissions. But CVT clutches have certain advantages when compared to a torque converter. For example, there are all fewer of them, they are compact in themselves and easier to manage.
2. Planetary reductor. This component is only used for reversing. When the vehicle is traveling forward, the mechanism is blocked by the forward clutch. And when the driver engages the reverse gear, the corresponding clutch locks the ring gear of the mechanism to the transmission case. As a result, the gearbox starts to move in the opposite direction. The transmission control system limits reversing speed.
3. CVT transmission. This device is designed to smoothly change the transfer parameter. Its main structural components are driven and driving pulleys, they are connected to each other by a chain. Each pulley consists of two shafts with a tapered surface. The drive element is connected to the crankshaft of the vehicle's internal combustion engine through an intermediate gear. And from the driven shaft, the torque is supplied to the main gear. When the transmission is running, one of the shafts on the pulley will move, as a result of which the control system can measure its diameter.
4. Metal chain. Audi was pioneering by being the first to use chain in transmissions. Its use made it possible to increase the range of gear ratios due to a decrease in the contact surface of the chain with the shaft, when compared with wedge-shaped belts. To make the metal chain less noisy, the engineers used links of different sizes in it.
5. Each shaft is equipped with a pressure and adjusting hydraulic cylinders. The adjusting mechanism allows you to adjust the gear ratio, that is, it changes the shaft diameter. The clamping device performs the function of pressing the chain against the shaft discs. A torque controller is used to ensure optimum downforce. This sensor is mounted on the drive shaft.
6. Differential and main gear.
7. A control system is used to ensure the correct operation of the unit. It contains input controllers, a control unit and a hydraulic mechanism that acts as an executive device. Input controllers are used to assess the position of the gear lever, the number of revolutions at the input of the gearbox, as well as at its output. The sensors monitor the temperature and pressure level of the transmission oil. The control device is designed to select the optimal gear ratio, taking into account the driving conditions and the driver's wishes. In accordance with the data received from the controllers, the control unit determines the oil pressure level in the system and implements it by acting on the solenoid valves. The device itself is mounted at the checkpoint. The actuator controls the cylinders, forward and reverse clutches and cools them, changes the oil pressure in the transmission.
8. Oil pump. Used to circulate the transmission oil.
9. Ejection pump. This device is used directly to cool the clutches. Its principle of operation is based on the supply of gear oil through a vacuum. The cooling process is carried out in a heat exchanger, which is part of the motor cooling system.
10. According to Audi engineers, the use of "Multitronic" CVTs made it possible to ensure optimal dynamics when moving the vehicle. Fuel economy is also achieved during normal operation of the box.

What is the service life?

Before buying a car with a CVT, many motorists are interested in the question of how much the CVT travels on average. The service life in vehicles Audi 2012 or other model year may be different. It happens that the box serves 40 thousand km, and sometimes it fulfills 200 thousand kilometers without any complaints. It all depends on the conditions of use and maintenance of the machine. It is due to the fact that CVTs are very sensitive to misuse that many potential car owners bypass cars with a CVT side.

You can repair the CVT transmission at authorized dealer or at the service station. Service from "officials" is relevant if the vehicle is still under warranty. The cost of repairs at a dealer is higher than at specialized service stations.

List of errors

A common type of CVT breakdown is the failure of the electronic unit. You can try to fix the problem by flashing the device, but the dealer usually changes the ECU. Car owners are faced with the problem of breaking a metal chain. "Officials" in such cases change the entire gearbox assembly.

By pursuing computer diagnostics CVT transmission, you can get error codes that indicate the following problems:

• 17105 P0721 or 17106 P0722 - the output speed sensor has broken down, this leads to the absence or supply of an incorrect signal from the control device;
• 17114 P0730 - diagnostics show an incorrect ECU gear ratio;
• 17134 P0750 - the ABS / EDS unit is broken or does not work correctly;
• 17137 P0753 - problems in the operation of the transmission electrical circuit;
• 18201 P1793 or 18206 P1798 - the sensor for the number of output revolutions has broken down or is not functioning correctly, with such a problem the signal from the controller will be either incorrect or completely absent;
• 17090 P0706 - the transmission selector position sensor is out of order or not adjusted.

Emergency mode

Why the emergency mode of the variator turns on and how to solve the problem - find out from the car owner's review on the video (the material was filmed and published by the Cars and Upgrade channel).

In emergency mode, the variator gearbox works when problems appear in the operation of the control unit, electrical circuit failure. If this mode is activated, the PRND scale on the dashboard will immediately light up. Other signs of malfunction:

• the driver presses the gas pedal, the car starts jerking;
• when switching speeds, the car jerks;
• in some cases, it is not possible to activate the reverse speed;
• when the gearbox goes into emergency mode, the car cannot be removed from the parking mode.

Mechanical breakdowns

Mechanical faults include:

• damage to electrical wiring, open circuit;
• oxidation or damage to contacts on sensors or control unit;
• open metal circuit CVT;
• mechanical damage to controllers;
• failure of the control unit as a result of mechanical impact on it, in this case, flashing the device will not help.

An example of what failures can occur in the operation of a variator transmission is shown in the video (the material was filmed and published by the user Ilya Filyaev).

How do I change the oil?

Replacing consumables begins with the purchase original oil.

For use in CVT gearboxes Audi company General Motors has released a special lubricant called ATF AUDI G052180A2.

If you are having difficulty finding an original oil, then you can replace it with Mobil1 LT71141. This liquid is no worse in quality, but its cost is on average 50% less. The oil should be changed every 60 thousand km. With such a run, the liquid usually loses its properties. In principle, you can use any other oil, as long as it meets API or SAE standards. When buying a lubricant, purchase:

• filtering device;
• sealant;
• rubber gasket for the pallet.

The volume of the purchased oil canister should be 5 liters.

As for the filters, there are two of them in CVT transmissions. One of them is mounted directly in the unit itself, therefore, to replace it, you will need to disassemble the unit. The second filter is the part of the tube connected to the radiator. This tube is only replaced if it becomes clogged or foreign particles are found in the lubricant.

In addition to the filter and the liquid itself, prepare:

• socket wrench -3357;
• hexagon;
• construction or medical syringe for filling with a special tube;
• clean rags.

Below is a detailed video instruction for self-replacement working fluid in a CVT gearbox (video filmed and published by Artur Prokurov).

It is necessary to change the lubricant in a garage with a pit or on an overpass, if possible, use a lift. The vehicle must be positioned horizontally and secured. The replacement process is performed like this:

1. Place a bowl or an old bucket under the drain hole of the variator box, into which the "mining" will be collected. If you drove the car onto a lift, then you can additionally flush the checkpoint. To do this, start the car engine, set the gearshift lever to the "Tiptronic" position, that is, to the manual gearshift mode. From the first gear, in turn, go to the highest gear, letting on the gas when the selector is shifted to each subsequent mode. In this case, the speed should be no more than 50 km / h. Then apply the brake, set the clutch lever to the R position and accelerate to 20 km / h. Press the brake again and set the selector to mode D. This procedure should be repeated five times, and then set the lever to position P, and turn off the engine.
2. When the motor has cooled down a little, you can start replacing. Climb under the bottom of the car. There you will see two plugs on the transmission. These are the drain and filler holes, which are also used to control the lubricant level. The drain plug is usually made of aluminum, and you must be careful when unscrewing it so as not to damage the threads. After unscrewing the cover, the process of draining the oil from the variator will go. In total, approximately five liters should come out of the system. Be careful not to get the grease on your skin.
3. After draining the consumable from the gearbox, unscrew the bolts that secure the pallet. After dismantling, remove metal particles from the magnet. After removing the debris, degrease the bottom of the sump with a solvent, remove the old gasket and clean the place for a new one.
4. Remove the filter element and seal from the transmission. Then put the pallet in place. Screw the drain plug together with a new O-ring.
5. Then unscrew the screw or plug from the inspection hole.
6. First, pour new oil into a syringe and connect a previously prepared tube to it. Pour consumables in small doses through the inspection hole into the transmission. Pour the oil until it flows over the edge. On average in a variator box Audi gear includes about 4.5 liters of liquid.
7. Install the filler plug and start the engine. It should run for a few minutes, after which its speed should be increased to 2500.
8. Please note that the level of consumables in the box depends on the temperature of the gearbox. Therefore, if possible, connect a computer with specialized software to the diagnostic connector and check the temperature level. The checked parameter should be no more than 30-40 degrees. At a lower temperature, you can pour the liquid, and at a high temperature, you can not add it. Both are dangerous for the transmission. Therefore, after filling, it is imperative to check the lubricant level in the gearbox with your own hands. If necessary, add oil to the system without turning off the engine. As you remember, oil is poured until it pours out of the control hole. Screw the cover back on.
9. Step on the brake pedal and shift all gears one at a time. Linger on each of them for a few seconds. Check the level again.

1. Good car dynamics. A vehicle can accelerate an order of magnitude faster than a car with an automatic transmission.
2. Driving a vehicle with a CVT is generally smoother. Due to the lack of gears, there are no jerks when shifting them.
3. Profitability. CVT cars generally use less fuel than automatic cars.
4. Control Ability vehicle both in automatic mode and in manual mode. If the driver gets tired of the automatic transmission, he can switch to manual control and independently change gears in accordance with his needs.

Main disadvantages:

1. The reliability of the CVT is poor. If you are wondering if the variator is reliable, then as we said, this type of gearbox often fails. Moreover, it can break even after 40 thousand kilometers. The weak point of CVT gearboxes is the control unit.
2. A sophisticated and expensive service. CVT transmissions are not as widely used as automatic transmissions. Accordingly, they have not yet been studied so well by specialists at the stations. Maintenance... Therefore, only authorized dealers are usually engaged in the repair of such gearboxes.
3. One of weak points variator - chain. As a rule, its resource is about 100-150 thousand kilometers. But it happens that it wears out earlier. And its replacement is not a cheap pleasure.
4. CVT gearboxes require special lubrication. Moreover, for each car model with a CVT, a specific oil must be used. Price Supplies rather big, and it is impossible to use unsuitable liquids.

When purchasing A4, you can choose between a five-step mechanical box transmissions, a continuously variable automatic transmission of a new type (Multitronic) and an automated transmission with manual shifting (Tiptronic).

All forward gears in the five-speed gearbox are fully synchronized, with the individual gear ratios matched to the respective engine power.

Gears last a very long time. If, despite this, a malfunction occurs in the gearbox, then it should be repaired in a workshop. Dismantling of shafts and gears requires special tools and appropriate knowledge. Even workshops, as a rule, send gearboxes requiring repair to special enterprises.

Engine power is transmitted through the clutch to the primary (input) shaft of the gearbox. On this shaft sit five gears (and another gear for reverse gear). These gears constantly mesh with the corresponding pinion gears. The gears of both shafts are supported on needle rollers, that is, there is no rigid connection between the shaft and the gear.

Gears and shafts
The gears rotate freely until one of them, due to the inclusion of a gear, meshes with the corresponding gear on the other shaft. To do this, on each shaft, first, with the help of a synchronizer locking ring, a rigid connection is made between the gear and the shaft, after which the gear sits rigidly on the shaft and can mesh with the mating gear for transmitting force. In order for the gears to mesh with each other, the shaft speeds must match. For this purpose, part of one shaft, by means of friction elements, slides over part of the other shaft. Due to friction, the shaft, which rotates faster, is braked until both shafts rotate synchronously.

Forward and reverse gears

The first three gears are crawler gears. The fourth gear is direct, the engine speed is transmitted in approximately 1: 1 ratio. When the fifth gear is engaged, the output shaft of the gearbox rotates faster than crankshaft engine. Naturally, the car must provide for and reverse... For this, an additional gear is located on each drive shaft, which reverses the direction of rotation of the drive wheels. When a gear is selected using the gear lever, the movements of the lever are transmitted through the gear shift bar to the shift segment located on the gearbox.

Continuously variable transmission Multitronic
The newly designed Multitronic transmission accelerates faster and uses less fuel. In addition, the Multitronic transmission provides more comfort, how five-speed gearbox with manual gear shifting. Audi Multitronic has undergone a number of changes, improvements and improvements, which is why it differs from the previous CVTs. Thanks to the optimally designed hydraulics, the shifting processes are very dynamic and without coasting. Thus, the disadvantage of the previous CVTs ("rubber band effect" or "slip clutch syndrome") is now a thing of the past. The disadvantages of the previous CVTs are also eliminated thanks to the control modes, which have been partially revised. The aforementioned "rubber band effect" is eliminated by using electronic system speed tracking, which provides dynamic driving performance while maintaining the same noise pattern.

In addition, the electronics takes part in a dynamic driving ratio control program 8 (DRP). This program, based on how the driver presses the accelerator pedal, determines the driver's desire - he wants to get maximum power from the engine, or, conversely, to save fuel. In the latter case, on the basis of the multidimensional characteristic of the engine speed, which is stored in the memory, the switch to a low gear ratio takes place already at a speed of 60 km / h (acceleration gear). If the driver gives full throttle (sharply presses the accelerator pedal all the way), then electronic circuit immediately switches to sporty driving characteristics and engages such a gear ratio (downshift) that is required for maximum power high revs provided already at low speed. During normal driving, the electronics selects the most suitable gear ratio in the range between two extreme values, and, in contrast to the shifting processes in a manual gearbox, here all gear ratio changes occur completely imperceptibly and without jerks. In addition, the electronics detect uphill and downhill movement and help the driver by compensating for power or, conversely, increasing the braking torque when braking the engine. The highlight of this program is the so-called "manual mode", in this mode, six fixed steps are switched in an additional rocker or using a lever on the steering wheel, and in this case the switching occurs smoothly, without jerks.

The principle of the variator

In the process of designing the Multitronic gearbox, Audi engineers managed to create a continuously variable variator with the help of a new transmission element (the so-called lamellar chain), which allows high forces and torques to be transmitted over a long period of time.

Moreover, this variator, in which the ratio between the maximum and minimum gear ratios is 6, in relation to the largest and smallest gear ratios surpasses all previous types automatic boxes gear. Due to the high maximum gear ratio the variator, for example, facilitates starting off and eliminates the need for a hydraulic torque converter.

Instead, Audi uses an oil-cooled multi-plate clutch, which not only eliminates the transmission losses typical of the converter, but also allows different starting algorithms. These algorithms are selected electronically in accordance with the driver's intentions, which again are determined by the way in which he presses the accelerator pedal.

In addition, the hydraulics have been designed in a special way. The variator uses a two-plunger principle, thanks to the separation of the oil flow between the circuit high pressure and the cooling circuit requires a much lower pump power than the conventional design. This allows you to increase the efficiency. gearboxes and improve the driving performance of the vehicle.

Magnesium crankcase gearbox

Along with stepped boxes gearboxes with aluminum crankcase In the Audi A4, gearboxes with a magnesium crankcase are also installed.

To avoid contact corrosion, use only genuine Audi parts (bolts and attachments). Damage resulting from contact corrosion is not covered by the warranty. A gearbox with a magnesium housing can be recognized by the lettering "Mg AI 9 Zn 1" located on the left side of the gearbox.