Good day. As you have already guessed from the name, in this article I will tell you how to check the automatic transmission when buying a used car. The article is a video, and its text description.
The first check of automatic transmission - Stall Speed \u200b\u200bTest (Stop Test).
This is the most universal test that shows the general condition. automatic box Change transmissions. This test allows you to determine the wear of the frictions in the box, as well as the condition of the oil and the bubble (hydrotransformer).
Test Methods Next:
- warm the engine and gearbox, for this pass 10 - 15 km.
- we put the car on the horizontal platform.
- Left foot, up to the stop, clamp the brake pedal.
- Transfer the automatic box selector to position D (Drive).
- The right foot sharply press, before the polish, on the gas pedal, for five seconds, while we look at the tachometer, we are interested in the maximum turnover that will be achieved by the engine (as soon as the turns stopped growing the test can be stopped).
in no case cannot hold the car brake, in the gas mode to the floor, longer than 5 seconds, since the box at that time works in heavy mode.
For most cars, when carrying out a test stop, turns are established in the range from 2000 to 3000. With a transmission of 70% of cars, it is designed so that the Test shown 2200 revolutions.
If, as a result of the test, the engine has not been promoted more than 2000 revolutions, then the engine itself is faulty - it does not develop full power.
If the engine does not promote more than 1,500 revolutions, it is probably defective "bagel" automatic transmission, or the oil in the box has not changed for a long time.
If the engine turnover is more than 3000, the friction transmissions are probably faulty, and it lives its last days.
In any case, a car that does not pass this test, it is not worth purchased.
Exceptions from this test are tuning cars. Some firms are specifically refining a bagel of an automatic box, so as to raise maximum turns, is done for more intense overclocking, but negatively affects the transmission service life. Personally, I strongly doubt that a person who buys tuning cars will read this article.
Second check - the beginning of the movement.
The check is performed as follows - stop the car on the horizontal section of the road, press the brake, put the selector to the D position, let go of the brake, while do not touch the gas pedal, as a result the car should start moving. The exact same check is done in the R (reverse) position.
If the car begins to move, it says about wear of frictional friction gears, their replacement is expensive.
The third check is overclocking and braking.
The technique of calibration is as follows - we start moving, pressing the gas pedal about 30% at the same time the car should slowly and without blows and jerks to gain speed. In this mode, it is desirable to wait for the sequential switching of all transmissions.
Waiting for the inclusion of the last transmission, just as smoothly stop the car with rolling, and should be sequentially engaged in reverse side, all programs.
Next check is carried out at exactly the same scheme, only gas pedal should be pressed into two thirds. Acceleration is carried out with greater intensity. In this case, strong pinks should not be, but transmission switching can be felt.
Fourth check - kikdown.
This check is carried out as follows - the car moves at a speed of 70-90 km / h, sharply, to the polish, the gas pedal is pressed.
The automatic transmission must drop one two programs down, that is, switches to the third or fourth transmission, the engine speed should grow sharply, and intensive overclocking should begin.
Fifth Check - Check Oil.
If the car is equipped with a service probe, we carry it out, check the oil level it should be between the marks at least and the maximum depending on the temperature on the cold, respectively 25 degrees., On the hot 80. We look at the oil in it should not be any crumbs and it should not smell from it. Garo
Six check - Check oil leaks.
The last check of the gearbox, it is carried out under the car on the pit - we look at the box from the bottom for the leaks of the gaskets, glands and traffic jams.
On this, the automatic box check ends, check without opening anything else.
For clarity, how the automatic box is checked, I recorded this video:
It is important to understand that the malfunctions of the automatic box are eliminated, as a rule, very expensive, and in most cases it is solved by replacing the automatic transmission on the contract. Therefore, if you have at least some doubts in the serviceability of the box, it is better to give up the purchase of a car, or ask a discount on a contract box.
I have everything today. I hope that you understand how the automatic transmission on the car is checked. All smooth roads and reliable transmissions. If you have any questions, ask in the comments ....
Every time you make a decision to make one or another purchase, you will have to face certain difficulties. In the case of a choice of car, the difficulty is mainly associated with the choice of brand, model, type of engine, colors, and also type of gearbox. Regarding the last, on the pages we have already raised the topic "", so today it will be a little about the friend.
Today we will try to help those who preferred automatic option transmissions and tell about how to check the box automatic When buying a car, then not to regret your purchase. It is necessary to check everything from the body and the cabin, ending with the engine and gearbox. However, these are very voluminous themes, so today we will consider only automatic transmission.
In the case of the manual transmission, the check is reduced to a banal test for the smoothness of switching, both in place and while driving. In addition, it is necessary to check the oil that is flooded in the box (smell and color), as well as listen to whether there are no extraneous noise, knocks and other sounds of an unusual gearbox.
As for automatic transmission (automatic gearbox), then it is much more complicated with it, maybe therefore wishing to buy a car with an "machine" less than similar cars with "mechanics". People are afraid to get to write and "buy repair" instead of a car. In addition, few know how to check the automatic transmission Or understand that the "automatic" is slowly dying. Fear is unfair, since the repair of an automatic box is not suiced, and be able to perform impeccable - units. The whole reason is that modern automatic transmission - has a rather complicated device and wanting to "pick up" in it not so much, it is easier to repair a few transmissions than one "automatic" and earn more.
3. Check the level, color and smell of oil. In the automatic transmission is poured aTF oilwhich, as a rule, has red. The level is checked on a flat surface, the gear selector must be in the "N" position, in some cars in the position "P". The level should be between the "Hot" and "Cool" marks. If in the smell of oil contains signs of burner or other extraneous smells not peculiar to oil, I really do not recommend buying this car. A small change in the color of the oil from red to light brown is allowed, provided that the box works fine and there are no metallic inclusions in the oil itself, which are easy to detect with a white sheet of paper. Apply a few drops of oil on a piece of leaf and look, is it not on a white background of a sheet of black or gray metal dust, chips, etc. 
4. Next, it is necessary to check the smoothness and correct shift. We warm up the motor and try to switch the modes of operation of automatic transmission. During switching, it is necessary to squeeze the brake, do not forget about it! When switching modes, too tangible pushs or car jerks, or the selector you should not feel. Delays in switching, shocks, clicks or shocks during switching - a clear sign of incorrect gearbox. The only jerk, which is considered the norm, is a small jerk when switching the selector to "D" mode. Although in this matter giving some specific advice is very difficult, because "Avtomat" - "Automatic" Some more modern copies work in generally sickly and no jerks there should not be there, on the other hand, older models of the automatic transmission had these very shoes, and during the inclusion of the mode "D" or "R" a light vibration was felt, this is considered the norm, again - What is the box for which box. In general, your task is to find this option that all these "phenomena will be at a minimum, and ideally there was not at all.
5. If all the above tests of the automatic tests passed, go further, and offer the seller to ride a car to make a final decision. Some sellers are not allowed to sit behind the wheel, as long as you have not bought the car. They can be understood, because if you take an accident or anyone will hit you during a trial check-in, it will be very difficult to prevent anything. Therefore, do not upset and ask the owner to execute the teams that you will be given to him during a test arrival.
It is necessary to check all the modes in all possible situations, namely:
- Sharp speed speed. Acceleration must be rapid, without jerks and knocks.
- Sharp acceleration while driving (while driving, for example, on the 4th after a sharp pressing of the gas pedal, the box should switch to reduced transmission, that is, the 3rd, 2nd or even 1st transmission depending on What the box is installed).
- Sharp braking. "AUTOMA" must be reset all speeds without delay and jerks to the 1st.
- Watch over the switching, up to 60 km / hour the machine must switch at least twice from the 1st to the 2nd, from the 2nd to the 3rd. Make sure that during the shift gear there were no jerks especially from the 1st to the 2nd (although almost all "automata" they are available, the jerks will not only have the most advanced automatic transmission and, of course, at the variator).
- The problem of many automatic transfers - slip, see it very difficult to inexperienced car owner, but this will indicate the gas pedal and engine turnover. The slip is called the moment when the revs grow and the pedal is lowered down, and the car does not go faster. This means that inside the automatic box, the frictions have already been worn or there is another malfunction, which does not allow adequately to function automatic transmission.
In general, I will tell you as a car owner with an automatic transmission, while driving, you should not feel anything that could alert you. With the perfect and well-coordinated work of the tandem, the engine-machine, work and the other should be practically sick. The only moment when you must feel the loud operation of the motor and the rapid growing jerk forward - with intensive acceleration, at that moment the "purring" engine and a smooth box automatically turn into a wild tiger, which may even be lying depending on the motor power and "sharpening" The car itself. If the car "sports" (why I highlighted the word sports in quotes, because sports and automatic transmission are incompatible things). For example, Honda Accord Type S, then grow high revolutions - Normal phenomenon. The most important thing that the jerks are not short and intermittent, the jerks should be felt from accelerating and strong pressing on gas, but not from the fact that you evenly accelerate, while the car pulls it as if an anchor is tied to it, which is constantly clinging and slows down the car. I think an example is clear, and you can easily distinguish a good "automatic" from faulty.
If you still doubt the correctness of your verdict, offer the owner to call for the service to the dealer, there will ask check automatic transmission According to the full program, if the "automatic" has some faults, then during diagnostics they will definitely be detected.
Check the box of automatic on defects and malfunction when buying a car BU is very important, because the cost of the automatic transmission is the lion's share of the price of the entire car and no one person would like to repair this unit or even worse than it to change this assembly.
The best planets are daily perfecting automatic transmissions. But, despite their efforts, this node still remains very vulnerable.
The danger of breakage (especially in conditions of incorrect operation) rises every year. That is why, with special attention should be paid to the inspection of the performance of the "automaton".
It is not difficult to make this work, but in the future you will get rid of a number of trouble and extra costs.
Why is this happening
In an automatic transmission there are many precision pistons. It is enough to stall one of them, as the entire box comes in disrepair. In addition, the "automatic" is very sensitive to slipping.
A pair of jams in the snow or dirt and gearbox simply "burns". Further repair can do not do one thousand dollars. It is worth noting that a certain danger for such an important node bears an incorrect oil selection or its low quality.
By the way, the repair of an automatic transmission does not guarantee its long service in the future. As practice shows, a rather small error during repair, and the automatic transmission will not work for a long time.
In fact, you throw money into the wind, and you do not get the result at all. This means that the testing of the box-machine when buying a car is mandatory.
That is why the automatic transmission check is made with great responsibility and seriousness.
If you can not do this work yourself - attract professionals.
What to pay attention to
When buying a car with automatic transmission, find out the story vehicle. Of course, it will take a certain time, but it can be saved a considerable amount of money.
For example, if the car was "under a taxi" or the automatic box was already repaired, then it is better to refuse this purchase.
If the car really enjoyed it, but the automatic transmission was in repair, then at least specify how the work was performed. The fact is that not all repair shops are able to refrank "automatic" qualified.
How to check the machine
When checking the automatic box, you can highlight several basic steps.
Oil level.
Check the oil level in the gearbox and its condition.
For this:
- Put the automatic transmission lever to the "Parking" position;
- Get off the car, get the probe from the transmission of the gearbox and wipe the oil about the clean rag;
- Now insert and get the probe again;
- Now touch the cape with white paper. On the oil stain should not be any foreign flakes or metal particles. The color of the new oil is red. If the lubricating fluid is already old, then it becomes brown, but in some cases almost black;
- Rate the smell of oil - it should not be pale;
- If a oil affection No, it is necessary to go to a specialized technical center, where experts will perform all the necessary work.
Checking automatic transmission standing still.
Check the operation of the automatic box, standing still.
Here it is necessary to follow the following sequence:
- Pay attention to the delay between the selection and mode " D."Or" R ". If any, then we can talk about the defect automatic transmission;
- Warm the car (the handle of the gearbox must be in the "P" position);
- Wait until the turns fall to 700-850 revolutions per minute;
- Put the leg on the brake and then translate the handle to the "D" position;
- After that, the car begins to pull forward. During the inclusion of transmission, there should be no jerks and jersekov.
When translating the handle to the "N" position, the box is turned off, and to the "R" position - almost instantly turns on, and the car begins slightly pull back. It also should not be unnecessary knocks and jerks.
Remember, if when the transmission is turned on, at least a second delay occurs, you can safely talk about the wear of the box and the need for its repair.
Test arrival.
Take a test race on the car.
For this:
- Gear lever put in the position " D.»;
- Remove your leg with brake pedals and start accelerating.
Upon reaching a speed car 60 kilometers per hour, shifting the gear should be made at least twice. At the same time, any delays, jerks and jerks should not be.
Special attention Plug on the shift.
Strokes, delays or shocks are a sign of a worn out automatic transmission that requires urgent repairs.
During the movement, turn away until the speed of 50 km / h and press the accelerator pedal until it stops. If the machine is working, it will switch to the lower speed and increase the revolutions.
Here you read about others about which it is important to know.
Now check out the work "overdrive", if it, of course, is. In many modern Japanese or American cars, this feature is available.
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, however, if technical Station Serious and gives a guarantee for your services. That is, there must be documents "Order-outfit", warranty coupon 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 bring the car in P "Park" (parking), and be sure to warm it up operating temperature - It is necessary if you test the cold automatic transmission, then 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 desirable to look at dashboard And make sure that the maximum transmission is included, 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 shocks, jerks, slip, bad dynamics - it all talks about the fault of the gearbox!
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.
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). Due to the increased complexity and varying of this mechanism, it often fails.
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 transmission Oil and 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 has transparency and there are no weighted inclusions, then such a color is also allowed - automatic transmission in the normal state, but the urgent replacement of ATF is required. 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: idling 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 is paid to the moment of transition from the first speed to the second - there should be no sharp jerks and strong pins, only a light and smooth impetus 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 a good automatic transmission without problems will give a 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 rapid acceleration and reducing the speed of up to 40 km / h, dramatically press the brake pedal, to check emergency braking - If everything is in order, then the automatic transmission will unkind 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 turned on Overdrive, it will start to light up check. Indicator Engine, this may indicate a malfunction of 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, you should understand that if the car has a weak motor installation, then such a test will be naturally failed - the car is physically not able to execute 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!
