How to check the automatic gearbox. Step-by-step instructions for self-checking automatic transmission when buying a used car. Free movement with reduced gear

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As for the market for used cars, you can find a large number of offers at an affordable price. However, it should be remembered that the repair of the automatic transmission or replacement of the unit can be up to 30% of the cost of the car with mileage.

For this reason, when buying a used car, you need to carry out an in-depth diagnostics of all nodes and aggregates, and also know how to check the transmission machine. Next, we will talk about how to quickly check the automatic machine on the machine, which allows you to decide whether to further consider one or another to purchase.

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How to check the serviceability of automatic transmission during primary inspection

Immediately note, checking the box automatic is the most important stage When selecting a used car. A frequent and widespread error is, the assessment of the body state, detecting hidden damage after an accident, etc. In this case, transmissions for one reason or another is not given due attention.

It is important to understand that when buying a machine with mileage, the automatic transmission must be carefully checked. The fact is that the repair of the box automaton may turn out to be more expensive than or some types of body work.

So, no matter how many years have a used car and which it has a mileage, as well as in what condition is the vehicle, it is impossible to find out 100%, as a particular car has been exploited. It turns out, it is better to immediately test the automatic transmission than to pay for repair or even replacing the aggregate.

Of course, it is possible to immediately go to a service station at each closed machine to diagnose, but in this case the loss of time and the cost of selection of the appropriate option will increase significantly. For this reason, you need to know how to check the box automatic right in place. So let's go!

What to pay attention to an interview with the seller

First of all, the service life and features of operation strongly affects the service life. Simple words, you need to understand how the previous owner served the machine. Some major issues should be set:

was there a repair box (if so, why and on what mileage, which was repaired / changed, where the automatic transmission was restored, whether there is a guarantee for work);
when was usually carried out and when it was the last, as well as for what reason (according to the regulations and on the run, by the state of lubricant or on another need);
what method was applied to replace the oil in the automatic transmission (replacement with the removal of the pallet, partial replacement (refreshment), hardware replacement);
what ATF fluid poured into the box ();
lee was produced, etc.

It is also important to ask the seller to actually confirm the information that it provides (availability of a service book with marks, order-outfits, acts of work performed, checks, etc.).

In cases where the car is not large (for example, a car with a "classic" machine and a real mileage of 120-130 thousand km), and the automatic transmission was not repaired and comprehensively served every 50-60 thousand km., Then the probability of a good The transmission states are quite high.

The main thing is to be used original transmission fluids or high-quality analogs, and the automatic transmission filter has been changed regularly. In this case, the waveleter can be in good condition and have an acceptable residual resource (about 40-50%).

However, if the seller hung 80-90 thousand km. And just changed the oil before selling (the oil on the dipstick is clean and transparent), or the oil did not change and the owner claims that the machine is not serviced, then this is a reason for a serious check of automatic transmission on a particular car, reasonable bargaining or full failure.

If the car mileage with the automatic transmission is big, then it is quite likely that the box has already come to repair. Note that this is not always a bad indicator, since a qualitatively renovated machine can work quite normally. However, if a person recently repaired the box and immediately sells the car, and there are no checks, acts and guarantees for performed works, it is better to refuse to immediately immediately.

We also add that you need to ask a question regarding how the car was operated. It is necessary to separately pay attention to indirect signs indicating heavy operation. For example, a mileage or age of the car is small, this car was served regularly, but there is a hitch or traces of it, causes complaints with the overall condition of the body, chassis, etc.

It is possible that such a car was not exploited by appointment, was actively used in a taxi, for the transport of goods, towing trailer, went only by soil roads, in mining or rough terrain, etc. As a rule, explicit or hidden traces of active and aggressive exploitation will reliably indicate that the car was "heavy" life.

Checking the level and status of oil in the automatic box

If, after communication with the seller, suspicion did not arise, the owner assisted that she changed the oil in the machine regularly, washed or performed the replacement of the filters of the machine, did not overload the car, etc., then you can proceed to practical tests of automatic transmission.

Checks should be started with transmission liquid ATF.. First, it is recommended to drive about 10-15 km by car so that oil in the automatic transmission is completely warmed.
Then you need to put a car on a flat pad, translate the box to P or N mode (depending on the model of the car), the engine is not necessary in most cases.
Next you need to open the hood and extract oil Prope Automatic transmission, wipe with clean rag without a pile and insert back. Then the dipstick is recovered.
First of all, pay attention to (normally, not lower than the middle between HOT and COLD marks, but not higher than the HOT). Also, the probe should not be seen traces of oil foaming in the automatic transmission.

I also add that there is no box on some models with the automatic transmission of the box. In this case, you need to be prepared for what you need to slightly unscrew one of the plug plugs (it is better to study the manual separately), after which the oil checks.

Checking the quality of automatic transmission when driving

After checking the oil, you need to move to the assessment of how the machine switches the transmission, how the modes work when the car stands, and also how automatic transmission behaves on the move under different loads.

To check the box you need to warm up, then the machine should be stopped, click on the brake and start switching different modes Using the selector lever. First, switching is slow, lingering in each mode of 10 seconds. Next switching should be faster (for 1 second each mode).
At the same time, it is necessary to pay attention to that, there are no obvious delays and failures when switching modes, extraneous noise, vibrations, and there are strong shocks or jerks when changing one mode to another.
It is also important to understand that minor shocks should be, this is the norm indicating that modes and transmissions are included. The strongest will push when the selector switches from the "D" mode in "R" and vice versa. However, jerks and vibrations, when the whole car pushes or shakes, should not be.
The next step is to check the automaton when driving. All tests are performed on a warm engine and automatic transmission. Optimally immediately found for checking a smooth long section of the road, where you can actively accelerate and reflect.

As for tests when driving, you first need to make sure that there is no inscription on the instrument panel (turning off the increase transmission). Then it should be enabled "D" mode, after which you smoothly accelerate the car from the place of 0-90 km / h to check the shift "up". Then you should also practice a sharp start with the "pedal to the floor".

After you need to perform smooth overclocking up to 30-40 km / h, followed by a sharp acceleration (triggering the KIK-Down mode). You also need to spend acceleration first, then let go of the gas pedal and do not press the brake to the machine.

Normally, with smooth overclocks, the machine must switch transfers almost imperceptibly (only light shoes are allowed) on a relatively low and medium turnover when switching (you can follow the tachometer). If the automatic transmission has 4 steps, switching usually occur by 2.5 - 3 thousand rpm, there will be about 2 thousand revolutions on the machine with a machine gun on 6 steps.

It does not allow any jerks, strong jokes, vibrations, delays during switching, etc. The box should clearly and timely include all the programs. If the machine works with failures, it directly indicates its malfunction.

With a sharp start and acceleration, the car should accelerate much more active, while turnover can reach 5 - 6 thousand. The dynamics of acceleration should be close to that indicator that the manufacturer itself indicates. For example, if the machine with an automatic passport should accelerate to "hundreds" for 10 seconds, then the acceleration dynamics should be close to such a mark.

If the driver is rigging to gas, but the car does not accelerate or overclocking is very slow, and the engine turnover is high, it suggests that the automatic box is dropped (). Test for a decrease in transmission during braking or rolling is also highly recommended, since in some cases it is when switching "down" you can see failures in the operation of the automatic transmission.

If the car rolls, for example, at a speed of 90 km / h, after the driver stops pressing the gas, normally the speed should gradually decrease, and the automatic box is almost imperceptibly reduced. Explicit jerks, shocks, increasing revolutions, delays when switching "down" indicate problems and malfunctions of the machine.

Another version of the check is the setting of the machine "nose" up (leaving). After that, the driver lets the brake pedal, but does not press gas. If the rise is not too cool, the car will slowly move forward or stand still. Rollback back is not allowed for boxes of this type.

We add that in some cases you can still hold the so-called Stall Speed \u200b\u200bTest (Stall -Test automatic transmission, steel test automatic box). Note that such a test is not recommended without extreme need!

It is also mandatory to notify the seller about your desire to conduct a similar check, and to inform that there are certain risks, damage or subsequent violations in the operation of the automatic transmission are possible.

As a rule, a box that is already worn, but still works relatively normally, after the test it can start a strongly bucking, the automatic transmission errors light up, etc. If you briefly, for the test, the driver presses the brake, while not releasing the brake pedals, transfers the box to mode D and simultaneously rigs on the gas until it stops. In this case, the gas pedal can not be held down more than 3-5 seconds.

After the test was completed, it is necessary to release the gas pedal, the brake is not released, and the gear lever is translated into N. The engine runs at idle 3-5 minutes, oil in the automatic transmission is cooled during that time. The check is then carried out in the same way in other automatic transmission modes (except P and n)

The essence of the test is reduced to the fact that it is possible to fully open throttle valveAlso simultaneously fix the testimony on the tachometer. Stall Speed \u200b\u200bTest allows you to determine the maximum engine speed when the gas pedal is fully pressed, and they should not deviate from strictly defined values \u200b\u200bfor a particular automatic transmission.

If the revolutions are noticeably higher, you should immediately release the gas, as the increase in revolutions indicates the blocks of the automatic package in the springs. If the turns are less, it may indicate the malfunction of the automiferry automifer. In the case when the value of Stall Speed \u200b\u200blays up to normal, it is believed that, friction and engine work normally.

That in the end

As can be seen, there are several simple and affordable ways that allow you to pre-check the automatic transmission when buying a car used right on site. If the operation of the transmission and the condition of the oil in the automatic transmission does not cause comments, then you can safely go on a service station, and you should not neglect the professional and complete diagnostics of the car in the service.

Specialists will check the body for an accident, will examine running partwill appreciate the quality of the engine and the gearbox, will conduct computer diagnostics of the internal engine and automatic transmission, refer to errors in electronic blocks, suspend force aggregate and transmissia for leaks.

If necessary, the service staff separately pay attention to the buyer for the presence of extraneous sounds during the operation of the aggregates and nodes, indicate the details that need to be changed soon, etc. As a result, the identification of certain faults and defects can be a serious basis for a reasoned bargaining or a complete refusal to acquire a specific used vehicle.

Check oil in automatic transmission

Assess the state of the transmission fluid is conveniently using the probe. But not all machines have a structure equipped with a dipstick. To check the oil in such a box, take a trip with the seller to the service station. A specialist will fulfill full diagnostics and will definitely say, in what state is the automatic transmission.

If the box has a dipstick, then its liquid will be checked independently. This is necessary in Parking mode (P) and on the engine center. While the engine works, you need to remove the probe from the box, wipe it with a cloth and insert into place. Then pull out and look at the level, color, smell the smell.

Level
In a cold box, the oil must be at the "Cool" mark. And after the warming of the machine to operating temperature In 65 degrees - the level will rise closer to the "HOT" label. If it can be seen that the oils on the dipstick is less than the required norm, this may indicate foaming, leakage fluid or poor-quality repairs.

Excess transmission fluid is harmful to the machine, as well as the disadvantage. At high speed, the oil foams and flows through the nozzle. Subsequently, it will be less than the prescribed norm, and the internal details of the box will overheat.

Smell
In a serviceable machine, the oil has a natural smell. If it smells like Garoy, this is a sign of overheating of rubbing parts in the box. Low oil pressure in the hydraulic system is the cause of poor compression of frictions among themselves. As a result, they slip and erased.

This problem has far-reaching consequences associated with the advent of metal chips. Metal particles are able to score the channels in the hydraulicone, which leads to oil starvation. Gradually, structural elements will be erased, and the box will completely fail.

Color
In the color of the transmission fluid, you can also judge the status of the box. With a small mileage, the oil acquires a dark red or dark brown shade. This is considered a good condition, lubricant fluid.

The big mileage of the automatic transmission on the same oil changes it into black. Such. transmission fluid loses lubricants. If the oil has a black color, then most likely the internal elements are seriously damaged and expensive repair is required.

Making sure in good condition of the oil, sit down in the car and check the gear shift. It is necessary to do it after the engine warming up. Before switching gear, press the brake. Look carefully and listen to the operation of the machine. Evaluate the smoother switching and make sure that there are no jerks, jerks and delays.

Smoothness. To check this option, move the lever. First, turn on the rear speed, then neutral and drive mode. The first time, move the lever slowly for all transmissions. And in the second, repeat the switch, but at an accelerated pace.
Rods, shocks, delays. The device with defects will give its condition during operation. Switching transfers, you should not feel jerks or push. Pay attention to the delay. In a serviceable transmission machine, quickly turn on. If the delay lasts more than one second, this is a sign of wear of the box.

Conducting "Stall Speed \u200b\u200bTest"

Stall Speed \u200b\u200bTest - is held after the engine warming up to operating temperature. The test helps to identify the defects of the box in the drive mode (D) and the reverse gear (R). During the inspection, the number of maximum engine speeds is determined during blocked wheels and a fully open throttle. For these values, you can judge the status of the automatic transmission.

Testing results U. different marks Cars are different. Specific values \u200b\u200bare specified in the car service book. Wanting to spend the test, consider that it makes it work automat on the limit of possibilities. But Stall Speed \u200b\u200bTest is safe and will not be able to harm the box under the following conditions:

the test duration should not exceed five seconds;
the machine is initially in good condition.

Therefore, before testing the automatic transmission, ask the permission from the seller. Refusal can be regarded as the uncertainty that the machine will be tested. And if it gives my consent, stick to the described technique.

Technique testing

Heat the engine up to 90-100 degrees Celsius.
Fully block the wheels, to do this, install the anti-digit stops, lift the handbrake and press the brake pedal.
Switch the ACP lever to Drive mode (D).
Press the gas pedal floor for five seconds.
Look at the tachometer and remember the number of revolutions shown on the last second.
Translate the automatic lever to neutral position (N), and release the brake pedal.
Check the result with the values \u200b\u200bspecified in technical book of this car.

The same testing must be done on rear transmission (R). But first take a break for a few minutes so that the oil in the box is cooled. To do this, give a motor to work on idling.

Test results

If the test values \u200b\u200bare less than the norm, this indicates a poor engine state that cannot develop sufficient power.
If the test result exceeds the permissible boundaries of revolutions, this indicates erased frictions of the front and rear gear.

Holding the above, preliminary checks, proceed to testing the box in motion. Offer the seller to ride. Find a safe and spacious territory where many cars do not go. During movement, check out several modes of operation of the machine:

Smooth overclocking. Make smooth overclocking up to 60 km / h. While the machine is gaining this speed, the machine must switch at least two times. If this does not happen, then the box has problems.
Sharp acceleration. Pay attention to the dynamics of overclocking. If the engine turnover is high, but the car slowly gains speed, it means that the box strokes. The car with a serviceable automaton accelerates quickly and without jerks.
Sharp braking. After overclocking, make a sharp braking. If the box is working, then speed will quickly lose the fourth to the first. At the same time, jerks and delays should not be felt.
Enable OverDrive Mode. Spoke up to 70 km / h. At this speed, the automatic transmission will turn on the fourth gear. Press the OVERDRIVE button, the machine must move to the reduced transmission mode, i.e. reset the speed of one step below. If this does not happen, the box again has problems.

Now you know how to independently check the automatic transmission before buying a car. The above methods will help determine the overall condition of the box, maintain a decent amount in the future. The main thing is not to be lazy to apply them and then you will find the car that will not let you down.

Video: How to independently determine the status of the automatic transmission

Sooner or later, the motorist faces the choice of buying a car with or not. And if decides to buy used, but with automatic transmission, then this option needs to be well check. The thing is that the automata of early issues, such as right-handed Japanese, is pretty vulnerable place car. That is, the structure of the automatic transmission itself is quite strong, but if your car is 10 years old, and you are no longer the first owner, God knows how exploited it. And the cost of repairing such a transmission will simply be offered! So comes to buying with the mind, actually there are several ladies useful Soviets + Detailed video. It will be interesting, I promise ...

Yes, it is better to test the automatic transmission - the case then pay expensive repairs. Today I want you to give a few tips to not get on the most difficult repair. But he is really expensive, for example, take the Moscow region - average price The repair of the machine is about 10,000 - 15,000 rubles and this is only a job (that is, it is trite to remove, disassemble and put back), and you also need to add the cost of spare parts, and this will add 30 - 40,000 rubles. Total 40,000 - 55,000 rubles, on average, of course, repair can be much more expensive if you have dear foreign car. Do you need it? So carefully check before purchase.

I also want to note that if you don't strive in the automatic transmission at all, then I strongly recommend going to the official hundred, let them check there (oil, work as a whole) - will look at the state, read errors in the ECU. Give 500 to 700 rubles, for diagnostics, do not skimp. This will give a great chance to take a full automatic transmission, not trash.

Well, okay, imagine that you have no money for checking on a hundred or simply "toad is stupid", so we will check it yourself, and it can do it almost everyone. Below there are several points that will help you at almost 80% determine the performance of the automatic transmission.

Conversation with seller

What should you find out:

This service. Ask how he cared for the "automatic", did the oil changed, as did it (with the filter or not). What mileage changed. Where changed, there is a "order-outfits", etc. If I changed on an official hundred, let's say after 40 - 50,000 kilometers, and also changed the filter, that is, the high probability is alive, because many manufacturers have a replacement interval of 60,000 km. But if when running at 70 - 90,000 km, the oil did not change, and the owner says - "I don't change the oil, I do not serve the machine," I personally would think about buying! Non-servant machines do not happen! It is only a trick of marketers, already at 100-110,000 km, most likely, such a machine will fail, friction clutch will be trite, or something more complicated.
We ask a question for repairs. Maybe the seller, he already repaired. It is not always bad, sometimes there are cases that the repaired version, it worked better than a new one, but this is if the technical station is serious and gives a guarantee for its services. That is, there must be documents "Order-outfit", warranty card and check. Then "Repair can be trusted." But if I did not understand what kind of station "At Uncle Vasi", and the seller is taking place, it is better to immediately refuse this purchase. For the repair of the machine will most likely have to repeat.

To be honest, then with the seller's reaction to these two questions, you can already understand, everything is fine with the box or not! This is a preliminary check, but it is mandatory! Sometimes and climb inside, no longer needed.

Check oil

Suppose the repair was not and the seller assures - that "everything is fine," changed the oil and cared. Then we get a car in P "Park" (parking), and be sure to warm it up to the operating temperature - it is necessary if you test the cold automatic transmission, then the sores may not appear - remember! Then the wasting machine and go under the hood, if, beautiful! Pull it out and look:

On the oil level . It should be on a normal mark, if below the critical level is bad! Oil fasting automatic transmission, too, nothing good carries!
On the state of oil . If it is dark, it is not always bad, it just worked and "absorbed" all the dirt. However, it should not have any fibers and chips. This is the extreme signs of wear. Therefore, we wipe the dipstick about a rag or better about a blank sheet of paper and consider this trail. If there are no third-party products, only oil, it means well. But if the oil is also fresh - transparent, in the automatic transmission it is usually pinking - reddish, it is actually even better. True, if it does not smell "burner".

Smell of oil . Highly important procedure, the fact is that the automatic transmission in the structure has so-called « » (friction discs), this is a kind of clutch. From undime replacement Oils, they can "burn" (now I will not climb the structure, read the link from above), and from this the oil just "stinks the burner." If you pull the dipstick, and it simply "dees" the burner smell, forget about such a car! This is 100% repair! If the probe is not, allegedly "maintainable automatic", then we simply unscrew the filling lid on top, and it is sniffing it - it also comes into contact with the oil in the machine, and either smells, or there is no "burner"

If everything is fine, it is necessary to move to checking the switching of the machine.

Checking on a standing car

Now we need to play with the gear shift on the standing car, I can repeat it necessary.

In general, the process is such - we need to across different modes, in various ways:

To start slowly, stopping on each transmission for seconds 5 - 10.
Then quickly, stopping on each transmission for a second.

This process is done while the brake pedal is pressed, so that the car does not ride back, nor forward.

What it turns out at such a process - we need to exclude "strong" shoes when switching gear. Small barely noticeable will necessarily have, this tells us that the transmissions are included, especially they will be felt on D - "Drive" and R - "Reverse". But if strengths are strong, such that the car pushes - this is not normal! You should not take such a car.

Check when moving

In place they checked, now you need to check in motion. On a heated car, to the working condition, engine speed should fall to 800 - 900 per minute. Check the best on a long level place, where you can accelerate to 60 - 90 km / h.

Here you can smash the inspection of the automatic transmission, in three stages:

Smooth and quiet ride, with a gradual increase of up to 60 - 90 km / h (depends on where they check).
Sharp start from the place.
Reducing gear

Now a little more.

Smooth ride . Here everything is simple - from the Parking mode (parking), we translate into the DRIVE mode (movement). And smoothly begin to accelerate, that is, check the "gentle" mode. The machine must switch the transfer, you will understand this tachometer, with a small shock when switching. At 90 km / h, the 4-speed automatic machine will be on the tachometer approximately 2,500 - 3000 revolutions, on 6 speed automata - about 2000 revolutions. It is also advisable to look at the dashboard and make sure that the maximum transmission is turned on, that is, 4 or 6 depending on the design. If on the 6-step automatic transmission, you have 3000 - 3,500 revolutions, and the "sixth" does not turn on, then something is wrong with the box!

Be sure to pay attention to the gear shift! If there are push, jerk, slip, bad speaker - It all speaks about the gearbox malfunction!

If a automatic transmission It works fine in this mode, go to the next check.

Cool start . Actually, everything is simple here, you need to stop, translate the box to the "Drive" mode and sharply press the gas pedal. The car must immediately accelerate, the turnover takes up to 5 - 6 thousand. The speaker must comply with the stated manufacturer. That is, if you are specified 10 - 12 seconds up to 100 km / h, approximately and should be such indicators.

If you "press in the floor", and the car does not go, that is, there are no speakers at all, and the engine roars, it means that friction discs will be bonus! This is serious! Believe such a "sortson" with nothing to confuse.

The second test at speed, the car was purchased, which means the last final.

Reducing gear . Also, everything is simple, check how the box lowers the transfer. Many when buying neglected by this test, but I think - that he is obligatory! We accelerate the car up to 90 km / h, and then just remove the pedal from the gas, the car rolls and gradually should reduce the transfer. It should take place gently, barely noticeably!

If, when decreasing, again, push or jerk, and the machine directly physically feels such a decrease. Refusing to buy

That's actually all on it. If you run through all the items, when buying a used car, and the transmission will endure everything, then by 80 - 90% it is normal.

Also, I would advise you, raise the car on the lift, see what nowhere is there any incl! It should not flow, otherwise the oil is departing and death.

Automatic box - the thing is quite reliable, but compared to the rest of the car, it still remains its most vulnerable part.

Using modern technique, we often do not have the idea how it is arranged. But if you do not diagnose in time, the picture will be next. When wearing one of the details the work of the mechanism will first become fuzzy, and then the device will fail at all.

What is an automatic box

ACAP is a complex structure consisting of a large number of precision pistons, the state of the transmission depends on the state.

Important! The state of the automatic box highly depends on the temperature, type and quality of oil in the transmission. For example, the box is easy to burn, dropping in the snow for 20-30 minutes.

Compared to a manual transmission, many components of the machine components are rapidly wearing natural way. For example, in the oil pan of any box there is a magnet, which settles the metal powder. After the same mileage on mechanical box It will be clean, and on the machine - is covered with a thick layer of metal.

You can repair the automatic box, but there is a large number of accurate parts. Dirty, Syrine or Repair Error - All this may cause another breakdown. Knowing the case when on the day of purchase new Audi. automatic box Burned due to slipping in the snow. The cost of repairs amounted to $ 2000, And in a year she had to be repaired again.

In order to avoid such situations when buying second-hand cars, you need to pay special attention to the state of the automatic box.

How to check

In order to test the machine gun of a used car, it is advisable to refer to the professional.

First, you need to check the history of the car. Do not buy it in the following cases:

if it was used in the car rental,
if there was a serious accident and subsequent repair.

In any case, you need to know whether the gearbox was repaired. If yes - again, it is better not to buy such a car. The reason for this is not the very fact of repair (some gearboxes after repair work even better), and the fact that not every workshop can repair the automatic transmission. And the quality of repair is not possible.

Important! Another point that should be considered: if a trailer has been used with the machine, this is also a reason to refuse to buy. Such exploitation of automatic transmission leads to its additional wear.

Checking the status of the automatic transmission is starting with an assessment of the amount and quality of oil in the box. There is nothing difficult in such an inspection, and you can make it yourself. The automatic transmission is set to "PARK", the engine is on idling. Take off the probe, wipe it with a clean cloth, insert back and remove again. The dipstick is wiped with white paper. If the layer is transparent, without metal particles and flakes - everything is in order. The oil must be red or brownish, without the smell of Gary. If black oil, has such a smell or particle impurities, it is better to abandon the purchase of a car.

However, there are automatic transmissions without probe, and check the quality of the oil in such a box can only be in the technical center. In such cases, checking the performance of the gearbox can be carried out using a test check-in.

Test race

Since the car is not yet purchased, you need to observe accuracy and caution. Before the start of the check, regulate the rear-view mirrors, the seat and check the operation of the brakes from any car.

After selecting the position of the transmission "Parking", you need to warm the car slightly. When the turns fall to 650-850 per minute, holding the leg on the brake pedals, switch to the "Drive" mode. Inclusion is felt physically, the car seems to "move" forward.

Switch to "Neutral", the gearbox turns off. Then switched to "Reverse", holding the brake pedal again by pressing. When you turn on automatic transmission in this mode, a sense of movement should occur. The next step is to switch from R mode R and back.

With all these checks, the box should react practically instantly, without jerks, jerseks and knocks. If there is a delay in the selection of the mode and its inclusion itself, the gearbox has defects and is subject to repair or replacement. You should not buy such a car.

If at this stage the gearbox showed itself from a good side, the next stage of checking - check-in. The ACP lever is switched to the "Drive" position, remove the leg with the brake pedal. The car accelerates approximately 50-60 km / h. The speed in the process must switch 2 times (on the second and third gear), and delays and jolts should not occur. When switching transmission, a slight change in the noise of the engine and the drop of revolutions occurs.

When the speed reaches 40-50 km / h, you can press gas until it stops. If the box is properly, then there will be a transition below, and the engine turnover will rise. If the delay is noticeable when switching, the push (or even the blow) is felt, it means that the automatic transmission is very worn. Japanese and American cars in the left of the box lever are the Overdrive button. With test arrival, it is also subject to verification. Turning to a speed of 60-70 km / h, pressing the button to switch it to ON mode. The serviceable automatic transmission switches to one transmission upwards. When switching to OFF mode - to drive down.

If during the Overdrive test begins to flash (Check Engine mode), on the issue of the operation of the automatic transmission, you need to consult a specialist.

Another manifestation of a worn box - when, when pressing a gas pedal, turns are increasing, and the transmission does not switch, the box "runs".

If there are any of the specified box defects, it is worth searching another machine.

Test check-in needs to be meticulously in order to avoid problems in the future. Repair the gearbox is quite expensive, and it is more expedient to spend time on testing automatic transmission than to pay for its repair in the future.

It happens that shocks and knocks when switching automatic transmission appear with a well-haired engine, or vice versa, disappear. Even if the seller says that for such a model of the car it is normal, it is better to give up the purchase.

A fully serviceable box works without noise and a knock, it does not raise and does not twitch the car. These features are not manifested when switching on any gears and with any degree of engine warming.

Now you know how you can check the box of the machine for service, and we hope that you do not buy a car with a faulty automatic transmission. Good luck on the roads, friends!

Hello to all readers of my blog!

Today's my article will tell you how to check the automatic transmission when buying a used car.

One of the most problematic units of the car is an automatic gearbox (automatic transmission). In view of increased complexity and vulnerability this mechanism He is very often out of order.

And the replacement or repair of this most important part of the transmission is one of the most expensive maintenance stations. Because of this, the purchase of a used car with automatic transmission can be very profitable to switch to a discharge of an extremely unprofitable transaction.

Therefore, if you decide to purchase transport with a similar mechanism, use my instructions for self-definition of the ACAP state.

Motor transport boxes are different:

Mechanical (MCPP);
Variator (WCPP, SUT);
Robotic (RCPP);
Automated (hydromechanical) (automatic transmission).

Attention! By virtue of historical conventions, the automated (hydromechanical) variety of such gearboxes is called automatically called automatic transmission.

ACPP as well as the RCPP frees the driver from the need to constantly switch the speeds and the principle of operation here is what: the driver sets the gear selector (lever) to the desired position and then all transitions between speeds in the selected range occur automatically.

The positions of the selector on modern automatic transmission are several, and they may vary on different stamps / models. But the main modes are usually the following:

Parking mode (P);
Rear gear (R);
Neutral mode (N);
Move mode forward (D);
Low gear (L).

The automatic transmission is characterized by a very smooth switching of speeds. It is convenient, but at the same time, it is a very complex and very vulnerable device, correctly repaired which is not every car mechanic.

Moreover, they don't like to repair them at all, since for about the same time and with smaller troubles can work with several ordinary gearboxes, for a large total payment. Therefore, a hundred usually try to add car owners precisely to the replacement of automatic transmission, and not to repair it.

Independent check of automatic transmission

Step One: Seller Selrography Machine

Immediately need to ask the owner of the car. It is possible that after a conversation with him to inspect the car no longer be needed - you look for another option.

You need to ask:

On the features of the use of the car;
ABOUT maintenance Automatic transmission;
On the repair of automatic transmission.

Ask about the features of the use of the car

If the owners were a lot, or the owner used a car as a taxi or for the carriage of various gravities on the hitch (its very minus itself), as well as for hunting, fishing, traveling by nature, etc., then it is better to refuse Even if other nodes of the machine are in good condition.

By the way, if there is no Parkop, then check possible tracks from its installation, as well as traces of the cable on towing eyes - towing for automatic transmission is also very harmful.

Machines with automatic transmission are little adapted for extreme conditions. For example, 15-30 minutes of slipping in the snow or dirt can lead to overheating of the transmission oil and a low-resistant spider gearbox.

Ask for maintenance of automatic transmission

Ask whether the replacement of transmission oil was carried out. If not carried out, and there is a mileage of more than 80 thousand km, then in the near future (at the turn of a run of 100 thousand km or more) problems with automatic transmission will be necessary, even if you immediately change the oil.

If the oil changed, then ask what mileage, what kind of oil it was replaced and who changed it. Whether the filter in the pallet was replaced.

According to the regulations of most automakers, oil replacement in the transmission should be carried out at the turn, not exceeding the mileage of 60 thousand km, and optimally at 35-45 thousand. Oil must be special transmission: usually this is ATF - special composition Automatic Transmission Fluid. Only certified STRs, which issue a check, order-outfit should be engaged in such a replacement, and at best the guarantee. If the filter changed with the oil, then this is an additional weighty plus.

In some cars equipped with on-board computer, just not to change the oil - you need to connect to the "brain" machine.

Ask about the repair of automatic transmission

If you get an affirmative answer to the question about repairing automatic transmission, then from such a transport it is better to refuse because there is a lot more chances to get a "cat in a bag", even if the owner, and documents and documents for its repair. It is in the case of the automatic transmission that the automatic transmission is better not to risk: there will be more chances for repairs than on trouble-free ride. But if the gearbox was not renovated, and replaced with a new one in a certified service station, then this, of course, is good, but ask the reason for such a replacement.

We still observe the reaction of the seller for competent questions about the gearbox, it is often that it gives suspicion of some trick or at all.

After the survey, if you intend to continue the examination, go to the next step.

Step Two: Inspection of the box and transmission oil

Visual inspection of an automatic box

For inspection, use only the bright time of the day, it is desirable to do it a day with dry and clear weather.

Ask the owner to warm up the car. In the summer, it is enough for 3-5, and in winter time 10-15 min. Install the car on the smooth place as possible and move the selector to the parking mode - P (on some brands you need N).

Attention! All tests for automatic transmission are carried out only after warming up the car.

When the machine warms up when the motor is running (with idle minimum revolutions), open the hood and inspect the box visually. It should not be leaks from oil, and it should not be allocated by the level of pollution from the entire other motor compartment. Do not be lazy and inspect the box from the bottom side.

Inspection of transmission oil

Now you can proceed to the inspection of the transmission oil. Here you should know that there are two varieties of automatic transmission:

Non-servant - the plug does not have an oil probe;
The serviced - on the traffic jam there is an oil dipstick.

However, both names are conditional and all automatic transfers are serviced (otherwise cannot be). But some sellers, to the question of why they dragged so long with the replacement of the oil, no longer answer: "So the box is so maintained!", Like, what else did you want.

And if a person does not really understand this, then his such answer can fully arrange. There was even a case when the buyer acquired a car with a completely killed automatic transmission that worked only in two modes. The owner of the buyer emotionally "enlightened" that it is all absolutely normal: "After all, you take the machine, Daragoy, yes? How can you be different, think? ".

Transmission oil must be investigated by the following criteria:

Level;
Consistency;
Color;
Solid and weighted inclusions;
Smell.

In the case of a non-maintainable box about the quality of the oil, it is possible to judge only by smell of traffic jam, and everything else will have to check for a hundred.

If the automatic transmission is served, then the probe with oil can tell a lot.

The level on the diploma is obliged to remain from HOT to Cool - the deficiency and even excess levels harm automatic transmission.

Normal oil has a thick consistency - it should not run from the probe as water.

The color of the oil should be from red and to dark red. If it is brown, but it has transparency and there are no weighted inclusions in it, then such a color is also allowed - automatic transmission in the normal state, but required urgent replacement ATF. If the color of the oil is dark and opaque or very black, then from buying this machine you need to refuse.

If some extraneous suspension (rags, metal inclusions, etc.) are noticeable in the oil of any color, then this car is also not recommended - most likely the cunning owner changed ATF before selling.

The smell of oil should be characterized by technical. If the smell of Gary goes from him, then from such a car you need to refuse - friction discs are burnt into the automatic transmission (clutch analog). The smell of the same french fish speaks of a long period of use of transmission fluid.

That's all over the inspection and inspection of oil. Not all and difficult, is it not true?

Step Three: Test Drive for automatic transmission

Test check at idle

Now you need to check the automatic transmission to work: at idle and in motion. Before this, be sure to muffle all foreign sources of noise in the car (radio, a loud conversation, etc.).

At idle the gearbox is checked as follows:

The brake pedal squeezes.
The automatic transmission selector switches to all modes with an interval of 3-5 seconds - all transmissions should be turned on immediately. The maximum delay time is 1 second. There should be no strong jolts, squeaks, pinks, etc.
The automatic transmission selector (with a squeezed brake) is driven over all modes again, but in this case, almost without delay between the modes. At the same time, nothing suspicious should not happen.
When the brake pedal is squeezed, quickly swipe the combination with a selector: Drive - Reverse - Drive. The maximum delay in 1.5 seconds is allowed. Pay attention to the shock, jerks, kicks, outsiders.

Only light and smooth jackets are allowed (most of all is felt in the REVERS and DRIVE position), but in no case should not be strong, short and intermittent. The serviceable automatic transmission is distinguished by the fact that it is impossible to find it on - it works quietly and perfectly.

Check inspection in dynamics

The second part of the inspection is already carried out in motion.

Before the test drive, it is desirable to choose a direct section of the road, where there are no possible obstacles for continuous overclocking up to 100 km / h (traffic lights, DPS posts, etc.).

You will need tests in all major modes related to the movement of the car. This is about, that's what checks:

Smooth start and overclocking;
Fast acceleration and braking;
Free movement with a decrease in gear;
Check the Overdrive function.

Smooth start and acceleration

In Drive mode (on it, you make the transition from the Parking mode) smoothly touch the car from the scene and also smoothly squeeze the gas pedal until the speed is 50-60 km / h. Until this mark, the serviceable automatic transmission should switch at least twice (from the first to the second, and then on the third). Special attention Hold the moment the transition from the first speed to the second - there should be no sharp jerks and strong pins, only a light and smooth push is allowed.

Continue smooth acceleration in sparing mode to a speed of about 90 km / h. To this mark, the machine will have to go through all the programs. You must carefully observe the presence and character of the impetus when switching, the presence of any sounds, etc. The serviceable automatic works almost silently, with light and smooth jokes when switching speeds.

Watch the tachometer testimony. For example, at 4-speed automatic transmission and speed of 85-95 km / h, the tachometer should show at least 3000 revolutions, and with a 6-speed gearbox, just over 2000 revolutions.

Fast acceleration and braking

For a sharp acceleration, when starting from the spot, switch the selector to the DRIVE position and dramatically press the gas pedal (only without excess fanaticism). Auto with good automatic transmission without problems will give good start From the scene and quickly gains momentum (5-6 thousand). This dynamic is useful to verify with the manufacturer declared: for example, 10-12 seconds are written there. overclocking up to 100 km / h - here is about this indicator and must be the result of the test.

If you bring gas, the unit gives turns, and the auto itself does not produce expected speakers, then it speaks about slipping frictions, and this automatic transmission will most likely need to be repaired or changed.

After checking the dynamics of fast acceleration and reducing the speed of up to 40 km / h, sharply press the brake pedal, to check emergency braking - if everything is in order, then the automatic transmission will unwind speed, and the car will stop.

Free movement with reduced gear

This test is needed to verify how the automatic transmission lowers the transmission. Some of these checks are considered excess, but when testing the automaton of unnecessary checks does not happen, so perform all test drives as possible.

Here you need to dispersed the car up to 90-100 km / h and let go of the gas pedal, the launching car into the roll. While the car will follow in the inertia, the gearbox must move smoothly (almost imperceptible) to switch to a transfer to a decrease, with a corresponding decrease in the indicator of the tachometer.

Checking the Overdrive function

If there is an increase in the increase transmission system (Overdrive function is an analogue of the fifth transmission for the manual transmission), it is also subject to verification.

Spoke up to 60-70 km / h and press the Overdrive button (ON), while the automatic transmission will immediately go to a higher transmission. Turn off this mode (OFF) - the transmission should easily drop by one level.

If when Overdrive is turned on, the indicator will light up Check EngineThis may indicate a malfunction of the automatic transmission.

Well, that's all tests for checking automatic transmission in the field. Not so much and difficult and if they are fully fulfilled, then you can be more than 80% confident in the health of the automatic gearbox and at the same time the entire transmission.

Those who wish to get a more detailed idea of independent check ACPP I advise you to view this video, where all the details of the tests are illuminated by the experimental owner of the car with an automatic transmission:

When inspecting the car, pay attention to its tires, especially when buying an SUV. If you see that the machine "shod" into any kind of rubber increased passibilityThis may be an excess stimulus to a thorough check of automatic transmission and more to a pre-personal owner survey.
With a test drive of a speed set from the place you need to understand that if the car has a weak motor installationThis test will be naturally failed - the car is physically unable to perform it. Have this in mind.
You should know that the automatic brain of automatic transmission analyzes the teams from the driver mainly based on the analysis of the behavior of the gas pedal. That is, there is a difference for the machine. How exactly you squeeze the pedal (sharply, smoothly, a bit, "before the polish", etc.) - based on this system determines the transmission in which sequence will transmit.

Conclusion

Well, you now have an idea of \u200b\u200ban independent check of automatic transmission. You learned that used machines with such a gear must be checked especially carefully, not to penetrate the faith for all sorts of assurances of the seller, and focus on the study of transmission oil and carry out all the points of the test drive.

And how do you check this unit you? Tell me about it in the comments. If info is interesting either useful, then I will add this article.

On this I finish the publication and wish you all the most fresh car drive! Place a blog subscription and share your articles in the social buttons.

Until next meeting, friends!