The great variety of automatic transmissions in Toyota vehicles can be divided into two broad classes. In the first of them, the control and monitoring functions are entrusted to the hydraulic equipment, in the second - to the electronics.
However, regardless of the type, automatic transmissions of models of this Japanese brand are traditionally distinguished by high reliability, wear resistance and performance. But it happens that such units break down. How to fix them yourself - further in the review.
Causes of Toyota automatic transmission malfunctions
The very presence of an "electronic machine" on board Toyota makes the simple and reliable design of the car rather vulnerable to breakdowns. Of all the elements of an automatic transmission of this type, the electronic unit delivers the most troubles to car owners.
The owners of hydraulic boxes are much less annoyed by malfunctions. Sometimes, to eliminate a breakdown, it is enough to splice the wire that is responsible for the operation of the solenoid.
However, a common problem with such automatic transmissions is the wear of its rear cover. Here you need to take into account the features of a specific automatic transmission. For example, the A40 is prone to mechanical breakdowns like damage to the same wire. But for boxes with an index of 140, a lack of oil often causes the destruction of friction pairs.
And yet, the main causes of Toyota automatic transmission breakdowns are improper handling of the vehicle, frequent trips in harsh conditions and failure to perform maintenance. Therefore, it is advisable to regularly diagnose the box for troubleshooting.
Symptoms of a problem
Almost all automatic transmissions, which are equipped with Toyota cars, are manufactured by Aisin. A working automatic transmission works quietly and smoothly. Signs that something is wrong with the device can be very different. Basically, these are extraneous sounds that occur when changing speeds or just while driving. For example, crunching or clicking.
A specific smell in the cabin during prolonged or short-term operation of the automatic transmission is another signal of a problem with the box. But the real thing is "it smells like kerosene" when gear changes slow down, or any of them don't turn on at all. Then the car will need urgent repairs.
A sign of an automatic transmission oil leak is red spots in the parking lot. And the condition of the transmission fluid itself should be monitored. It should be translucent with a shade of red. If the composition is cloudy or with a burnt smell, then it is time to replace the lubricant.
If a problem occurs, the box starts emergency mode, that is, it switches to third gear and does not change it. In this case, a corresponding warning symbol appears on the vehicle dashboard.
Features of automatic transmission repair
Toyota automatic transmission is a very expensive unit, the repair of which in a car service will also cost a lot. However, in many cases, it is realistic to independently return a broken Japanese automatic transmission back to service. Another thing is that with a large number of defective parts, it is cheaper and easier to replace it with another, new or used one. In addition, it is not a fact that after an artisanal repair, this device will work as it should.
For motorists who are not particularly familiar with the design of Toyota boxes, it is better to resort to the help of a car service if it breaks down. But it should be borne in mind that some craftsmen may try to save on the cost of parts due to the quality of the services provided.
"Cheap and long"
The automatic transmission is very convenient on the road, but its restoration is not easy for an experienced mechanic, and what can we say for beginners. Self-help troubleshooting is performed according to the same scenario as in a car service, only it costs much less, although it takes much longer. After all, removing the box, servicing this device and returning the unit to its place in this case takes more than seven hours. BUT The main stages of automatic transmission repair are as follows:
- diagnostics;
- dismantling the box;
- disassembly;
- replacement of broken parts if required;
- assembly;
- installation of the box on the car;
- control diagnostics.
To repair the box, first of all, you will need a lift, an overpass or an inspection pit, as well as a high quality set of tools. The manual for the car, part of which is the problematic automatic transmission, does not hurt either.
Diagnostics of the "machine"
It is recommended to do something about the automatic transmission only after assessing its condition. This is the initial and one of the key stages of the renovation. To diagnose the box, a motorist may need the help of an "expert" or the involvement of a computer.
The result of the study should be a list of upcoming repairs, if any, and the necessary spare parts for their implementation.
The most common fault detected in Toyota automatic transmissions in this way is bushing wear, due to which the shafts begin to dangle. Also, checking the box allows you to determine the cause of the rolling of the bearings in the inner race. The general scheme of diagnostics of the "machine" assumes:
- determination of the condition and quantity of oil;
- checking the engine idling;
- inspection of the joints of electrical wiring and cables;
- study of error codes of operation of automatic transmission and engine control units;
- checking the box on a stationary car;
- automatic transmission testing while driving;
- determination of pressure inside the box control unit.
However, identifying the failed automatic transmission parts is only half the battle. They still need to be repaired or replaced. So the diagnostics smoothly turns into removing the "machine" from the car and inspecting the device for mechanical defects. True, if the problems are limited to electronics, then to eliminate them, neither the dismantling of the box nor its disassembly may be required.
Dismantling Toyota automatic transmission
It should be noted that the "box" is not so easy. For Toyota rear-wheel drive cars, its weight is about 70 kg, for front- and all-wheel drive cars, this parameter can reach up to a centner. Therefore, for the normal dismantling of the automatic transmission, special hydraulic stands and a small crane will be required. Or hefty partners.
The first step to separating the car and the automatic transmission will be to disconnect the oil cooling pipes, electrical connectors, and various mechanical connections from the unit. Heat exchange elements should be removed very carefully, because accidental damage to the fitting will entail the replacement of the entire line.
Together with the box, the torque converter is also dismantled, leaving it on the engine can lead to deformation of the hub, the oil pump, as well as the oil seal of the transformer itself. In addition, the motorist runs the risk of being doused with transmission fluid.
Parsing the box
When repairing a Toyota automatic transmission, it is advisable to lay out the parts in sequence, so that later you do not wonder what was behind what. And also try not to let them fall on the floor or inside the automatic transmission.
The division of the automatic box into parts begins with unscrewing the bolts holding them together. After that, you can remove the pallet and get access to the filter, which usually appears to the motorist in not the best condition.
The filter itself rests on three fasteners, and diagnostics of this element can clarify a lot about the causes of problems in the automatic transmission. Dismantling it, you can get to the "artificial intelligence" of the box - hydraulic logic, which includes the following valves:
- blocking;
- pressure;
- switching - 3 pieces.
The hydraulic logic must also be dismantled.For this, the "plugs" of the electrosolenoids and ten-millimeter bolts are disconnected, after which the board is carefully removed. And after it - the battery and the drain valve located on the fluid coupling. Next, you should manually diagnose the filling of the box for backlash. Parts should not jump out of their places.
In order to remove the pump, two bolts are attached to its sides, in the role of which spare parts from the starter can act. The products are screwed by hand until they stop, after which they are proportionally fixed with a socket head. It is important not to overdo it, so as not to add new breakdowns to the box.
But a couple of twelve mm bolts located on the side of the pan and holding it, on the contrary, need to be loosened. The vessel is released and immediately examined for malfunctions. In this case, the product should be turned over very carefully, since various little things sometimes pop out of it. Alternatively, you can dismantle the pump from the Toyota with a puller from the Zhiguli.
Next, you should remove the block of the overdrive fourth gear from the automatic transmission and check the condition of the bearing washer. It is desirable that it does not fly off at the same time, and then it is not necessary to calculate the place of its original location.
Finally, the stopper is dismantled from the automatic "matryoshka", which sometimes causes certain difficulties for motorists. Here you can use a screwdriver, but try not to break anything.
Conclusion
The cost of self-repairing an automatic transmission of a Toyota car will probably be much less than the cost of performing such work by a car service. And this despite the fact that the owner of such a car is unlikely to want to save on spare parts for it.
On the other hand, for those who are not familiar with the intricacies of restoring Japanese automatic transmissions, it is still better to contact a workshop before finally breaking down expensive equipment. In this case, both time and money will most likely be saved.
|| list |
- Causes of Toyota automatic transmission malfunctions
- Symptoms of a problem
- Features of automatic transmission repair
- "Cheap and long"
- Diagnostics of the "machine"
- Dismantling Toyota automatic transmission
- Parsing the box
|| rss | The great variety of automatic transmissions in Toyota vehicles can be divided into two broad classes. In the first of them, the control and management functions are entrusted to hydraulic equipment, in the second - to electronics .__ NEWL__ However, regardless of the type, automatic transmissions of models of this Japanese brand are traditionally distinguished by high reliability, wear resistance and performance. How to repair them yourself - further in the review .__ NEWL__ Causes of Toyota automatic transmission malfunctions__NEWL__The very presence of an "electronic machine" on board Toyota makes the simple and reliable design of the car quite vulnerable to breakdowns. Of all the elements of automatic transmission of this type, the electronic unit delivers the most troubles to car owners .__ NEWL__ The owners of hydraulic boxes are much less annoyed by malfunctions. Sometimes, to eliminate a breakdown, it is enough to splice the wire responsible for the operation of the solenoid .__ NEWL__ However, a common problem with such automatic transmissions is the wear of its rear cover. But for boxes with an index of 140, a lack of oil often causes the destruction of friction pairs .__ NEWL__ And yet, the main reasons for Toyota automatic transmission breakdowns are improper handling of the car, frequent trips in harsh conditions and failure to perform maintenance. Therefore, it is advisable to regularly diagnose the box for troubleshooting .__ NEWL__Signs of malfunctions__NEWL__Almost all automatic transmissions with which Toyota cars are equipped are manufactured by Aisin. For example, crunching or clicks .__ NEWL__Specific smell in the cabin during prolonged or short-term operation of the automatic transmission is another signal of a problem with the box. Then the car will need urgent repair .__ NEWL__A sign of oil leakage from the automatic transmission is red spots at the parking lot. If the composition is cloudy or with a burnt smell, it means that it is time to replace the lubricant .__ NEWL__ In case of malfunctions, the box starts emergency mode, that is, it switches to third gear and does not change it. In this case, a corresponding warning symbol appears on the dashboard of the car .__ NEWL__Features of automatic transmission repair__NEWL__Automatic transmission from Toyota is a very expensive unit, the repair of which in a car service will also cost a lot. In addition, it is not a fact that after handicraft repairs this device will work as it should .__ NEWL__ For car enthusiasts who are not particularly familiar with the design of Toyota boxes, it is better to resort to the help of a car service if it breaks down. But it should be borne in mind that some craftsmen may try to save on the cost of parts due to the quality of the services provided .__ NEWL __ "Cheap and long" __ NEWL__Automatic transmission is very convenient on the road, but its restoration is not easy for an experienced mechanic, and what can we say for beginners. And the main stages of automatic transmission repair are as follows: __ NEWL__ diagnostics; __ NEWL__ dismantling the box; __ NEWL__ disassembly; __ NEWL__ replacement of broken parts, if necessary; __ NEWL__ assembly; __ NEWL__ mounting the box on the car; __ NEWL__ control diagnostics .__ NEW L quality. The manual for the car, part of which is the problematic automatic transmission, does not hurt either.
