DIY repair of automatic transmission mitsubishi diamond

P.S. All events took place in Novosibirsk, in Akademgorodok in the summer of 2005.

Many thanks to Oleg for his expert advice, which saved me a lot of time and money.

Many thanks to Denis, who provided me with his Zhigulenka for use during the renovation, you can't go shopping on foot.

Special thanks to my friend Seryoga (owner of Tsifra) for coming in the evenings with a beer to the garage and brightening up my work with advice on business and not on business.

Well done. The ruble saved is the same as earned, and if you enjoy it, then doubly.

8. Reworked the timing belt tensioner. Now I have it not hydraulic, but mechanical. The stem travel is adjusted by a bolt with a locknut. The new one was in that store, it cost 1200 rubles, but I did not buy it for reasons that my converted one would be more reliable. I gave 200 rubles for the alteration. Let's see.

***
Yes, such a mechanical one is safer, but this is not entirely the right decision.
in this case. Moreover, on such a motor and with such, to put it mildly,
through one place with a projected timing drive. Exactly
the hydraulic tensioner should be there, and not mechanical.
They saved money in the wrong place, and then you will understand why.

Write in short pliz where the computers are, how to shoot, secrets, tricks, and so on. I also want to look at them.

This draws a decent review. Thank you for taking the trouble to dial.

heh he 2 SergV_NVN RESPECT!

There would be more such articles! Huge respect to the author!

Companion! request: write down, if not for scrap, what do you feed the horse (petrol, oil)? I liked that he had moving in id. comp. after our 50,000 kilometers of roads!

Tell me which Hyundai engines are suitable for spare parts for 6G73, compensators are very interested in!

ATTENTION! This text does not carry any important information on automatic transmission repair, there are no diagrams, advice on what and how to do. There is a lot of sensible text, almost no specifics. You won't find anything particularly useful here. This is just the author's reasoning on the feasibility of repairing an automatic transmission with his own hands and his opinion on the approach to this matter.

AUTOMATIC TRANSMISSION F4A232 MITSUBISHI IS CONSIDERED. With other boxes, the situation may be completely different.
So.
After installing the contract automatic transmission, instead of the broken one, the previous box remains on the hands. Naturally dead.
ALL OPTIONS IMPLY THAT YOU HAVE A WORKING BOX ON YOUR CAR AND THERE IS A SECOND INOPERATIVE STATE, AVAILABILITY, THE ABSENCE OF WHICH IS NOT CRITICAL FOR YOU.

As always, there are several options:
1. Do nothing. There is a place where to put it in the garage, let it rust. Maybe later someday, for some reason it will come in handy.

2. Throw away, hand over for scrap. Well, everything is clear. Out of sight and out of sight, so to speak, maybe even 500 rubles will be given.

3.Submit for analysis. Here, how lucky, maybe someone needs it (they say it is quite scarce), or maybe no one will take it. And if they do, then most likely at the price of scrap metal.

4. Disassemble for spare parts for the installed box. It's not a bad option, you can save money in the future if the breakdown is not identical in both, they will turn out to be interchangeable and someone will take the bulkhead of two boxes at once to assemble one of them ... It is unlikely that you will be given a guarantee for such a repair, but they will definitely take money. And most likely the same as during a normal repair of such an automatic transmission

5. To give a dead automatic transmission for restoration / repair in service. It already makes sense. If not for one but. The repair price is

10,000 rubles or more for work, not including spare parts. And these same spare parts can be recruited from 5 to 25 thousand. With an average price of a contract automatic transmission of such a model at 20 thousand.rubles option can be considered not cost-effective.
A separate word about the guarantee. The warranty period will be calculated from the moment the box is handed over to you.
And this means that by the probable moment of breakdown of the automatic transmission installed in you, the guarantee for the restored one will probably end and you may be left with two non-working boxes and double the cost of repairing them, or even a third will have to be bought. If the warranty is calculated from the moment the automatic transmission was installed (mileage warranty), then the warranty is given only when installed in the service of the company that repaired it. if you bet with someone else, you will lose the guarantee. So you should immediately put the repaired box. At the same time, having paid for the service and for the installation. ... They will not store it for you "on demand" at home, and even if they do, after a year the warranty terms will expire. Take it to lie with you, until the installed one breaks down - you lose the warranty. (Who knows what you were doing there with her while she was lying with you!)

6.Repair of automatic transmission from “craftsmen”. By craftsmen, I mean local handymen, straighteners, minders from garages, who, for 2 rubles, will “sort out everything better than in the service”. I don’t deny that it really happens. But you need to know places and people. And once at a time it is not necessary. In general, the same as option 5, only the price is lower, and there is no guarantee under any circumstances.

7. Repair the automatic transmission yourself. The most hardcore and interesting, in my opinion, option. Of course, he means a lot of conditions, the first and most important of them is the desire to do it. If there is a desire, there will be opportunities, I think so. Of course, there is no guarantee of the success of this business, especially if you have not been involved in automatic transmission repairs before. But the costs are also minimal (we will not take into account that your money or time is more dear to you). Again, if the repair did not work out, you can always use options 1 to 4, and if you haven't broken anything / lost anything, then 5.6.
In fact, you only spend money on spare parts if you have:
Free time.
A place for renovation work.
Brain.
Arms.
Tools
It also requires analytical and logical thinking, allowing the correct use of time, place, brains, hands and tools :-).

The conditions are met and I am thinking about doing this when they put a working box on me, and the dead one is removed from the car. And if someone is interested in the opportunity to fix the automatic transmission himself, here's where I'm going to start:

1. The first thing to do is to understand how the automatic transmission works. There is a myth that the automatic transmission is supposedly such a gravitational machine, in which only aliens in the service and the Japanese at the factory understand and then only because they have been studying it all their lives. I don't think so. Yes, it is more complicated in structure than the manual transmission, but this is more likely because it is arranged differently, and not at all because of some kind of secret space technologies. It is not the gods who burn the pots.
For those interested, here is a link to an informative video review about the device of a 3-speed automatic transmission from Toyota.

2. Find as much information as possible about a specific automatic transmission (in my case, F4A232). For my box, I found a wonderful book, which is called "Repair manual for automatic transmissions Mitsubishi F3A2, F4A2, F4A3, W4A3, F4AC1 for front-wheel drive vehicles." I have one in electronic form in Russian and English.

3. Find a supplier of spare parts. There are many options, the most reliable and economical, as it seems to me, is to diagnose a malfunction, check with the diagram and select the number of the desired part / spare part from the existential catalog. Well, having collected the articles in a pile, already collect your repair kit for the box. And order where it is more convenient and cheaper for you. Otherwise, you run the risk of buying spare parts that do not suit you or do not need, which means that you will be wasted.

4. Be able to consult. In an unfamiliar business, situations always arise when you do not know what to do and how. Here you cannot do without the help of experienced people. Ideally, it would be nice to have a familiar automatic transmission repairman, but I don't have one.I will be using the internet and its many car communities. I also have acquaintances of turners, straighteners, mechanics and all sorts of non-profile specialists in cars.

5. You need to start doing something. It is very important.

And at the end, a set of links, just like that, for "inspiration":
my.housecope.com/wp-content/uploads/ext/64 is a very useful site for those who decided to repair an automatic transmission with their own hands, diagrams, manuals, etc.
repair of automatic transmission Nissan Primera P10 1991 in garage conditions
- Overhaul of automatic transmission Town Ace
my.housecope.com/wp-content/uploads/ext/3141/forum/150825 DIY automatic transmission repair. (Audi A6 with gearbox 01N)

Well, something like this. There was a lot of text. If you have read it, thank you. I look forward to your comments and advice. If you haven't read it, thanks anyway for stopping by.

Changing the oil in the Mitsubishi Diamant gearbox is most often associated with the repair of the automatic transmission itself, or it is replaced with a new one in the course of work to eliminate oil leaks, since it must be drained for work. The oil in the automatic transmission is poured by the manufacturer once for the entire service life of the car. It is recommended to entrust the oil change in the Mitsubishi Diamante automatic transmission to professionals, but in some cases you can handle this operation on your own.

Functions of ATF oil in automatic transmission Mitsubishi Diamant:

• effective lubrication of rubbing surfaces and mechanisms;
• reduction of the mechanical load on the units;
• heat removal;
• removal of microparticles resulting from corrosion or wear of parts.

The color of ATF oil for automatic transmission Mitsubishi Diamante allows not only to distinguish oils by type, but helps to find out in case of a leak, from which system the fluid escaped. For example, oil in automatic transmission and power steering has a red tint, antifreeze is green, and in the engine it is yellowish.

Reasons for oil leakage from automatic transmission in Mitsubishi Diamant:

• wear of automatic transmission oil seals;
• wear of the surfaces of the shafts, the occurrence of a gap between the shaft and the sealing element;
• wear of the automatic transmission sealing element and the speedometer drive shaft;
• play in the input shaft of the automatic transmission;
• damage to the sealing layer in the joints between automatic transmission parts: pallet, automatic transmission housing, crankcase, clutch housing;
• loosening of the bolts that ensure the connection of the above-mentioned parts of the automatic transmission;

The low oil level in the Mitsubishi Diamante automatic transmission is the main reason for the failure of the clutches. Due to the low pressure of the fluid, the clutches do not press well against the steel discs and do not contact each other tightly enough. As a result, the friction linings in the Mitsubishi Diamante automatic transmission are very hot, carbonized and destroyed, significantly contaminating the oil.

Due to a lack of oil or poor-quality oil in the Mitsubishi Diamante automatic transmission:

• plungers and channels of the valve body are clogged with mechanical particles, which leads to a shortage of oil in the packages and provokes wear of the sleeve, rubbing pump parts, etc.;
• steel transmission discs overheat and wear out quickly;
• rubberized pistons, thrust discs, clutch drum, etc; overheat and burn out;
• the valve body wears out and becomes unusable.

You can check the oil level in the Mitsubishi Diamante automatic transmission using a dipstick. The oil dipstick has two pairs of marks - the upper pair Max and Min allows you to determine the level in hot oil, the lower pair - in cold oil. Using the dipstick, it is easy to check the condition of the oil: you need to drip oil onto a clean white cloth.

When choosing a Mitsubishi Diamante automatic transmission oil for replacement, you should be guided by a simple principle: it is best to use an oil recommended by Mitsubishi. In this case, instead of mineral oil, you can fill in semi-synthetic or synthetic, but in no case should you use oil "lower class" from the prescribed one.

Synthetic oil for automatic transmissions Mitsubishi Diamant is called "irreplaceable", it is poured for the entire service life of the car. Such oil does not lose its properties under the influence of high temperature and is designed for a very long period of use of Mitsubishi Diamante.But we must not forget about the appearance of mechanical suspension as a result of wear of the clutches with a very significant mileage. If the automatic transmission has been operated for some time in conditions of a lack of oil, it is required to check the degree of its contamination and, if necessary, replace it.

Methods for changing the oil in the Mitsubishi Diamante automatic transmission:

• Partial oil change in the Mitsubishi Diamante box;
• Complete oil change in Mitsubishi Diamond box;

Partial oil change in Mitsubishi Diamante automatic transmission can be done independently. To do this, it is enough to unscrew the drain on the pallet, driving the car onto the overpass, and collect the oil in a container. Usually up to 25-40% of the volume flows out, the remaining 60-75% remains in the torque converter, that is, in fact, this is an update, not a replacement. To update the oil in the Mitsubishi Diamant automatic transmission in this way to the maximum, 2-3 replacements are required.

A complete oil change of the Mitsubishi Diamante automatic transmission is carried out using the installation for changing the oil in the automatic transmission, by specialists in the car service. In this case, more ATF oil is required than the Mitsubishi Diamante automatic transmission can accommodate. One and a half or double volume of fresh ATF is used for flushing. The cost will be more expensive than partial replacement, and not every car service provides such a service.

We fill the oil through the technological filler hole (where the automatic transmission dipstick is located), using the dipstick we control the oil level in the automatic transmission to a cold one. After changing the oil in the automatic transmission, it is important to check its level after driving 10-20 km, already with the automatic transmission warmed up. Top up if necessary. The regularity of oil changes depends not only on the mileage, but also on the nature of the ride on the Mitsubishi Diamante. You should be guided not by the recommended mileage, but by the degree of contamination of the oil, systematically checking it.

Message nicolai2205 »24 Jun 2013, 09:37

Help solve the problem or point out where such a problem was solved, I did not find it by searching.

Mitsubishi Diamante 1996 F31A 4-speed tiptronic worked fine. drove 150 km on the highway today and the problems started

The car began to get dull on acceleration, especially uphill. if the gas is at half speed, the car does not accelerate.
The oil level is normal, but darkened, there is no burning smell, a couple of foam bubbles on the dipstick.
All gears are engaged softly without jerking, but the car does not move. Uphill speed drops to 20 km / h, in a straight line you can drive another 50-60.

It would seem the end of the automatic transmission, but here is the most interesting thing !!

If you turn off the car and start, then the automatic transmission works absolutely properly - excellent acceleration in all gears from 0 to 160.
Only every 5-10 minutes or 10-15 km - the situation repeats itself again begins to dull and slip.

Then I stop, immediately turn on the wilderness, start looking for some, and again drove off normally.

I suspect something in an electrician, but what ?? sensors or valves of some kind.

FAQ for automatic transmission Mitsubishi W4A32, W4A33, F4A3x for the first generation RVR and other Mitsubishi of the 90s.

I don’t know about you, but I’m already starting to get tired of answering the same simple questions. The wiki doesn't seem to work. So I'll try to edit one post. Hopefully there is no limit on the number of edits?

Automatic transmission, it is a box, W4A32 or W4A33, the latter on T / C engines (turbo). Has 4 forward and 1 reverse gears. The W4A32 version, in addition, has a torque converter lock (aka GT, donut or tambourine), which rigidly connects the engine crankshaft and the automatic transmission input shaft. These boxes were installed on RVRs in the bodies of N1x and N2x, Shariot N3x and N4x. Also on Libero and something else. The front-wheel drive version of the box is called the F4A3x, it has the same design, only there is no center differential.

Automatic transmission modes:
“2” - it is allowed to include the first and second gears.
“L” - only the first gear (the inclusion in the box differs from the first gear by “D” and “2”, but the gear ratio is the same).
“OD OFF” - the inclusion of the fourth gear is prohibited.
“POWER” - shift upshifts at high revs, such as racing mode.
"HOLD" - the box immediately turns on the second, not the first, gear, this mode is called winter.

Maintenance :

- Frequency. Replacement of ATF and filter - every 30 thousand km

- ATF fluid. Mitsubishi recommends using ATF SP as ATF. Now on sale there is only the third generation of Mitsushny liquid in a box - ATF SP-III. American ATF SP-III is about 2 times cheaper than Japanese ATF, the quality is the same. There is an analogue from British Petroleum, but the price is the same as the American one. There is also the Korean ZIC ATF SP-3. In addition, the other half of the YAVRovodov are pouring Dexron II and do not complain. Even the servicemen. Probably because it's cheaper. And the final choice is only yours. Most importantly, try not to mix ATF SP-III and Dexron II. And the Dexron II needs to be replaced 2 times more often, i.e. every 15 thousand km. (addition about ATF, and there is also the topic of oil in automatic transmission)

- Filter - you can duplicate. But not the cheapest. And preferably in a fully metal case (for example, Concord F43FLT01AA). There are some concerns about the plastic case.

- Laying the pallet. When replacing the filter, you will also need a new automatic transmission pan gasket. If the plane of the pan is bent, for example, because when ATF began to drip, someone pulled the pan bolts, then a sealant will come in handy. But the sealant is of high quality, in the minimum required quantity and strictly according to the instructions. By the way, in services, they often just sit on the sealant, without a gasket.

- Inspection of the pallet. When removing the automatic transmission pan, carefully inspect its contents. Size of hedgehogs on magnets. Whitish spots in ATF. Pieces of metal. Etc. Before installing, be sure to clean and wash the pallet, including the magnets.

- Heat exchanger. At the bottom of the engine antifreeze cooling radiator there is a tube - this is the automatic transmission heat exchanger. For the turbo, there is also an additional ATF radiator. Always flush them when changing ATF.

- ATF stream... Before replacing ATF, be sure to measure the ATF flow through the heat exchanger at “N” - at least 1 liter should have flowed in 20 seconds. If less, top up the drained in the automatic transmission and repeat the measurement, but immediately from the box. 1) If at least 1 liter runs up, then the heat exchanger is clogged. Then pay special attention to cleaning the heat exchanger and the pipes to it. After replacing ATF, recheck the ATF flow through the heat exchanger. 2) If the same amount of ATF runs up, then you have a problem with the pressure in the automatic transmission. After replacing the ATF and cleaning the heat exchanger, take a control flow measurement. If everything is still bad, then you are waiting for a box repair.

- Attention! At “P” (parking mode), the oil does not circulate through the box, but is immediately drained into the sump. To pump oil through the box, and mainly through the torque converter, the automatic transmission handle must be set to “N” (neutral).

Do you have a problem with the automatic transmission? Need forum help?

1) Always write down all the data of the car: model, year of manufacture, engine, gearbox, body number (FRAME or VIN). Better even just type it into your signature in the User Center right away.
2) Describe what you did with the box, what problems are now.
3) Write down the results of the self-diagnosis of the engine ECU and the automatic transmission ECU.
4) The results of the ATF flow test through the heat exchanger are also desirable.
5) What is the color and smell of ATF?

Last edited by Vivo on Tue Oct 24, 2017 2:16 pm, edited 17 times in total.

The undoubted advantages of the Mitsubishi Diamante automatic transmission are both its quality and phenomenal reliability and high reliability. This is the property of many Japanese cars. But this does not mean that you can avoid such an action as Mitsubishi Diamond automatic gearbox repair.

In a car like the Mitsubishi Diamante, with excellent design and qualities, there are no units and elements that would not have been thought out to the smallest detail. The automatic transmission of Mitsubishi Diamant is also a paragon of reliability. Operation of a Japanese car in Russian off-road conditions often causes damage to the device.

Prices for the repair of automatic transmission Mitsubishi Diamante (Mitsubishi Diamante)

If you have questions, or need advice, call!

Mitsubishi Diamante automatic transmission repair - this is a job only for specialists with the highest qualifications, because an impeccable car needs decent maintenance. Low-quality repairs will certainly lead to even more disappointing problems and breakdowns in the automatic transmission, and then you will definitely have to buy a new automatic transmission, and this is a very expensive procedure.

Our service center offers a specialized service such as the repair of the Mitsubishi Diamant automatic gearbox.

Qualified craftsmen are able to detect the cause of malfunctions in the shortest possible time and correctly eliminate them. What can help us with this?

Our work is based on three important principles:

• highly qualified personnel;
• the most high-tech equipment;
• and always high-quality components from the manufacturer.

Mitsubishi Diamant automatic transmission repair price It is calculated from the cost of components for the restoration of the gearbox, payment of personnel work and depreciation of equipment.

The procedure for repairing your car in "Automatic Transmission Service"

Step 1. Call us and we will find a convenient time to repair your car. If your car is not on the move, we can deliver it to our car service using a tow truck, and there is also a guarded parking on our territory.

Step 2. Before starting work on the diagnosis and repair of the automatic transmission, we wash the car at the car wash and tighten the seats with covers so as not to contaminate the interior during repairs.

Step 3. Our specialists carry out diagnostic work, during which the causes of the malfunction are identified and the cost of the work is formed.

Step 4. A repair plan and a list of spare parts required for repair are drawn up.

Step 5. A preliminary estimate of the cost of the repair is made. After agreeing on the estimate with the client, repair work begins.

Step 6. Repairs are carried out in full accordance with the manufacturer's requirements.

Step 7. After the repair, the car is run-in to check the quality of the work performed.

Step 8. The foreman hands over the repaired car to the client, the operability is checked after the repair.

Step 9. Signing of documents, including an act of completion and a warranty card.

Step 10. The job is done, and you leave our service in a repaired car.

The Mitsubishi Diamante car of the famous Japanese concern Mitsubishi belongs to class E or business class and is distinguished not only by its excellent technical characteristics, but also by its impeccable body design.

The first generation of this car rolled off the assembly line in the late 90s, since then Mitsubishi Diamante has been continued to be produced both for its domestic market and for other countries around the world.

Manufacturers have made every effort so that during operation such a capricious unit as an automatic transmission works flawlessly and the repair of the Mitsubishi Diamant automatic transmission does not become a habitual expense item for the buyer.

Our car service carries out repair of automatic transmission Mitsubishi Diamant, all modifications of the car, at the highest level of restoration work.

Mitsubishi Diamante automatic transmission variation

Review: I gave my box to two well-known service stations, and each of them is considered a professional service for servicing automatic transmissions in the capital. But it turned out that he only wasted money - the problem was not eliminated (there were blows when switching some speeds). In general, I was terribly upset, because because of the car, a trip to Europe was practically disrupted. Friends recommended to call in the service, in the morning I drove the car, in the afternoon they dropped my bill, which contained a detailed description of the necessary spare parts and the total price for the provided repair work. The price is the middle for Moscow rates, since I was already at 2, and before that I called and found out in other services. The deadline was given - a week, I complained to the guys that there was no time - the trip was disrupted. They went to my meeting and made the automatic transmission in just 3 days. As a result, my family and I are incredibly happy! The car has already covered over 1,000 km.

Review: In the middle of summer, problems with the gun began. Delayed, and did it completely in vain. As a result, it got to the point that it was necessary to change the machine completely. Friends advised to stop by the technical center. The guys from the service are just wonderful, they worked quickly, everything was replaced and repaired. I gave a little money, but I wanted to put a new one with the officials, the money turned out to be 5 times less with the guys from the service.Most importantly, I was pleased with the conscientiousness of the guys! I still drive, and there are no problems at all, everything works like a clock.

In this article we will describe and show how electronic automatic transmission control units are restored in our company "MMC - EXCLUSIVE" using the example of MD 740500 and MD 740504 (MITSUBISHI SIGMA) and MD 740498 (MITSUBISHI DIAMANTE). MD 739226, MD 752754, MD 752525, MD 752526, MD 752756 are restored in the same way, as well as a slightly fresh version for two connectors MD 754098, MD 754099, MD 754100, MD 754101 and many others. dr. SIGMA, DIAMANTE, GALANT, LANCER.

One of the reasons for the breakdown may be:
- moisture ingress

- long service life (more than 12 years).

And so, about everything in order.

If moisture gets into the automatic transmission control unit (TCU), it must be urgently removed, if this is not done in time, the process of destruction of the printed circuit board tracks will begin. If the process has begun and the printed circuit board is badly damaged, there is no point in repairing such a control unit.
Another reason for the failure of the ECU is a short circuit in the wiring:

A short circuit in the wiring may result from:
- accident
- old age wiring insulation
- low qualifications of the craftsmen who were involved in the repair of this vehicle.

Repair of the control unit in this case can be of different types of complexity:

- from replacing the control keys for the gear shift solenoids (simple repair)

- before replacing the MH 6111 microprocessor (in the more recent MH 6211), memory chips with firmware and the E 303 port expander, etc. (more difficult).
But most often, ECUs come to us for repair due to a long service life (more than 12-15 years) or, which is very rare, from an overcharge of the generator.
Consider an example of what happens to an ECU after 12 years of operation:
For the experiment, we offered the owner of the Mitsubishi Sigma car to make a T.O. automatic transmission control unit. To do this, they removed the control unit, it turned out to be MD 740504
opened the lid:

It looks like everything is in order and the owner had no complaints about the operation of the machine, but the experienced eye of the master sees that under the large capacitor 100 Mkf 16V there are traces of corrosion

We solder the capacitor and this is what we see on the printed circuit board under it:

A couple more weeks and the ECU would be out of order. The electrolyte that began to leak from the capacitor damaged the conductive tracks of the printed circuit board, but in this case it was not yet completely finished and the control unit could easily be saved by replacing the capacitor and restoring the track. Which was done:

We closed the lid, installed the ECU, and the car drove away.
This case ended so happily thanks to the great experience of our company. Further in our article, it will be described what could have happened if we had not offered the owner of the car to replace this capacitor:

And so the requests for the repair of the MD 740500 (Mitsubishi Sigma) and MD 740498 (Mitsubishi Diamante) units were received. Symptoms of the same car are driving in emergency mode in 3rd gear. Those. turn on the "D" mode and start to get under way from the 3rd gear. The car starts badly and as a result of this, high fuel consumption. In addition, you cannot drive for so long, the gearbox itself fails. This emergency mode is provided by engineers in order to drive to the nearest car service on their own.

This is how the Sigma automatic transmission control unit looked like:

Specifically, we will dwell on it. First, open the roofs of the blocks:

On the printed circuit board of the Sigma and Diamante cars, under the capacitor, you can see damage to parts and tracks with the naked eye due to the leaked electrolyte from the capacitor:

On the MH 6111 microprocessor, a dark spot is visible in the center, the same is visible on the M 60011-0131 J (E 303) port expander - this is a consequence of the strong heating of the microcircuits.

Sometimes in the place of the spot in the center of the microcircuit, you can see a bump on MH 6111, and on the E 303 a crack, but it happens that no traces of damage are visible, while both microcircuits burned out. In any case, if the unit stops working due to a leakage of the capacitor, the first thing to do is to burn out the E303, the microcontroller and the memory chip are more resistant to an increase in voltage.
Why is this happening because of some kind of capacitor. The engineers who designed this unit probably looked far ahead, and arranged the tracks so that when the positive track under the capacitor burns out, the 5 Volt stabilizer breaks down. As a result, improper operation of the stabilizer, microcircuits burn out from overvoltage. It happens quickly in a matter of seconds.Therefore, when the masters begin to look for the reason, it is enough to turn on the ignition and keep it on a little. Then the ECU comes to us in the same way as these, about which this article is written.

Now directly about the repair itself:
The first step is to troubleshoot the 5V regulator. This must be done before replacing the microcircuits, otherwise they will burn out again when checking the unit at the stand, if the stabilizer still does not work correctly. And so we solder everything that visually burned out. Including burned out and the output power transistor in the stabilizer circuit, this was visible during visual inspection (to the right of the center of the crack):

We restore the stabilizer by replacing the capacitor, the power transistor, restore the tracks, if necessary, change the resistors that have suffered from corrosion with new ones. Upon completion, we supply power to the 12V ECU connector and check the operation of the stabilizer. The output should be stable at 5V.
This is what the PCB looks like at this stage:

With a more detailed examination under a microscope and control measurements with a device, the list of burnt parts turned out to be like this:

The most valuable among them is the memory chip with the “M 731 a” sticker, this is the firmware. Over the long years of repairing Mitsubishi control units (and this is from 2000), we have read many different firmwares from working units. Therefore, a clean memory microcircuit is taken and the programmer writes M 731 a into it, which is stored in our database. In our other articles on the repair of motor ECUs, our colleagues with whom we cooperate have developed and described replacements for MH 6111 and E 303, but only original versions of microcircuits are needed to repair this unit. Accordingly, we order from suppliers MH 6111, E 303 and M 402 A or we solder from other blocks that cannot be restored:

The microcircuits are professionally soldered to the board. A completely ready-made version of the ECU, first it passes the test for special. stand, then in more detail on the car, carefully checking how each gear shifts in motion. At the last stage, the printed circuit board is covered with specials on both sides. varnish as in the factory:

The photo also shows the quality of the soldering on the reverse side of the printed circuit board, as at the Mitsubishi plant.

The final stage is the restoration of the ECU housing. After the restoration work, it is pleasant to hold it in your hands, you get the impression of a new part, which is no different in quality from a new one, which costs many times more.

Most of the automatic transmissions on Mitsubishi vehicles are produced under the same brand. Boxes from other manufacturers such as Toyota are also used. However, the advantage is given to automatic transmissions of our own production - their work with the engine and other components of the car is more harmonious, and maintenance and repair of Mitsubishi Diamante automatic transmissions are cheaper for the owners.

Mitsubishi automatic transmission is a complex mechanism on which smooth gear shifting and driving comfort depend. Therefore, when repairing this unit, the specialists of the AKPP Guru service center strictly adhere to the manufacturer's recommendations:

• disposable oil filters must be changed when refueling consumables;
• check the operability of all gearbox mechanisms in a timely manner.

Due to the complex design, it is often difficult to detect some damage without additional inspection. Therefore, the Mitsubishi automatic transmission is diagnosed.

Symptoms indicating that the gearbox needs repair are:

• the manifestation of oil smudges;
• missing transmissions;
• slipping at the start of the car, jerking, vibration;
• the appearance of the indicator signal about the malfunction on the on-board computer.

The reasons for the malfunctions are as follows:

• inappropriate operating conditions of the car;
• improper use of the gearbox;
• untimely maintenance;
• use of substandard (non-original) consumables.

Urgent repair of the automatic transmission may be necessary in the event of destruction and blocking of the fluid coupling. Such a malfunction leads to more serious damage to the unit, therefore, affects the safety of driving a car. Therefore, the specialists of the company "AKPP Guru" recommend that the owners of these brands of cars contact the service center at the first symptoms of malfunctions.

Mitsubishi automatic transmission repair includes the following steps:

1. input diagnostics of the unit;
2. dismantling the box from the car;
3. disassembly of the unit and troubleshooting of its constituent elements;
4. drawing up a list of works and parts required for replacement;
5. bulkhead, assembly of the unit;
6. installation of automatic transmission on a car with subsequent output diagnostics.

Thanks to the experience and availability of all the necessary repair and diagnostic equipment, the specialists of the service center "AKPP Guru" will carry out repair work on the Mitsubishi Diamante automatic transmission of any complexity. All events and the selection of component parts are carried out in the presence of the owner of the car; customers are provided with a guarantee for a certain mileage of the car. The company's specialists urge you to seek qualified assistance through a phone call or an application form on the service center's website when detecting the slightest malfunctions in the car's automatic transmission. This will allow you to eliminate problems in time, save on expensive maintenance and increase the operating resource of the unit.

Mitsubishi automatic transmission repair takes place in several stages:

1. Initial consultation by phones +7 (495) 795-16-69, +7 (903) 001-30-99
2. Computer diagnostics of Mitsubishi
3. Test Drive
4. Lift diagnostics
5. Dismantling of the Mitsubishi checkpoint. Troubleshooting of the box (may occur in your presence).
6. After agreeing with you the amount of repair and the terms of the guarantee, the checkpoint is repaired.

We repair Mitsubishi automatic transmissions of the entire model range: repair of automatic transmission Mitsubishi Pajero, Montero, Outlander, Galant, Lancer, Colt, Diamant, Eclipse, Mirage, etc.

When repairing the transmission - free evacuation of the car.

The warranty for the repair of the Mitsubishi automatic gearbox is from six months to 2 years!

Mitsubishi Model

Automatic transmission model

Automatic transmission repair cost *

* the cost of repairing automatic transmission without spare parts

Mitsubishi Montero Sport 2003 Having driven about 20 km by car, or when outside the air temperature from 5 degrees Celsius, the distributor spontaneously turns on to the 4H position, or rather when turning the wheels, it is felt that the distributor is turned on, drove it onto a lift, turn the wheels, the front end is turned on, hanging for about 40 minutes, it cools down automatic transmission and razdatka, the front end is disabled. What could be, what is the reason, the transfer case lever is in the AWD position all the time.

Answer: According to your description, presumably, the reason lies in the sensors on the transfer case. Such problems cannot be solved remotely; it is necessary to do at least computer diagnostics.

Mitsubishi Lancer 10 2008 The variator needs repair. What is the price of the issue?

Answer: The complex of work on the repair of the variator (removal / installation, disassembly / collection, troubleshooting) is 14,000 rubles. To this cost will be added the spare parts that will be required to restore the variator to working condition.

Determine the Mitsubishi box model: