In Japan, a lot of cars are made with automatic transmission. This applies to almost all brands - Nissan, Honda, Lexus, Toyota, Mitsubishi. It must be said that the Japanese have quite reliable models of automatic transmissions. One of these is the Aisin automatic transmission. But untidiness also happens to her. In our article, we will talk about the features of Aisin automatic transmission 4-st and 6-st, as well as feedback from car owners about this transmission.
Characteristic
So what is this drivetrain? This is a Japanese-made automatic transmission , which can be designed for a different number of stages. Initially, only four-speed gearboxes were produced. Now the Aisin automatic transmission 6-st has gained great popularity.
This box is installed on most cars of the budget and middle class. As for the premium segment, an eight-speed AA80E gearbox is provided here. The Aisin automatic transmission device includes:
- Torque converter
- Valve body.
- Planetary gears.
- Differential (applies to front-wheel drive cars).
- Cooling system.
- Pump.
- Control system.
The interior of the box is filled with special oil. This is ATP fluid. It not only lubricates the rubbing parts, but also allows you to transmit torque, performing the function of "wet" clutch.
Reviews
Motorists in reviews of the Aisin automatic transmission note that it is quite reliable. Among the advantages of this box in the reviews, they note:
- Small yet powerful hydraulic unit. This contributes to more compact dimensions of the box (which is especially true for passenger cars) and provides effective lubrication of parts.
- Fully automated box control. This allows you to consume less fuel.
- Smooth gear shifting.
- Good dynamic performance. If a conventional torque converter slows down acceleration, then the Aisin automatic transmission has no worse performance than mechanics.
- Reliability. These boxes show a good resource in adverse conditions. So, before major repairs such a car can run about 400 thousand kilometers.
- Simple construction. This allows not only to save on repairs, but also to make independent maintenance. So, you can do the replacement of ATP fluid with your own hands. It is enough to buy the appropriate oil for Aisin automatic transmission. But also do not forget about the cleaning element. Along with the oil, the filter in the Aisin automatic transmission also changes.
Some cons
With frequent loads and the use of a sport mode, the friction clutch of the automatic transmission torque converter may become unusable. Also changes its color and oil. From red, it turns into black. liquid contamination must not be allowed. In the event that the piston friction was worn down to iron, the oil is saturated with adhesive. This negatively affects the operation of the valves of the hydraulic unit. Spools can seize both “hot” and “cold”, preventing the solenoids and springs from opening the channels with liquid in time. This results in loss of traction and increased wear of the clutches in the bags.
Service
The manufacturer recommends replacing the automatic transmission oil every 100 thousand kilometers. And if the car is used in extreme conditions (frequent traffic jams and driving at low temperatures), this period must be halved. Replacement requires 7 to 10.5 liters of ATP fluid. A fine filter is also needed. It is felt, with a double membrane. It must be changed at the same frequency as the gear oil itself.
Diagnostics
How to understand that the box needs repair? Several third-party symptoms may report this:
- Jerks when trying to set speed. This usually happens when switching from first to second gear.
- Kicks when parking. This is felt when the driver moves the box selector from the "Parking" mode to "Drive". It seems that the car at the same time breaks down.
- Loss of acceleration dynamics. This manifests itself in slipping in one of the gears, or in several at once.
You also need to monitor the oil level. If it is not enough, this will lead to a drop in pressure in the system, as well as to overheating of the transmission.
Repairs
How are the above malfunctions repaired? To do this, replace:
- Sealing elements. These include oil seals and gaskets. This is a mandatory procedure that must be done if the clutches burn out. Contaminated oil saturated with wear products will wear Teflon rings. They are manufactured with certain tolerances. In the case of the slightest wear, the ATP-liquid begins to “pickle”.
- Friction clutch. They are not subject to restoration and change in a set. In the event that the burning of steel disks was diagnosed, the oil also changes, since it is contaminated with refractory resins. New steel discs are also being installed.
- Solenoids. Their replacement is performed only after disassembling the hydraulic unit and troubleshooting. The planetary gear set is also examined. It may also require replacement, but very rarely.
- Gasket pallets. This is the most harmless operation. It is usually required after changing the oil when the sump itself has been removed to install the filter.
- Pump bushing and oil seal. These elements can break up over time. This is facilitated by constant vibration from the friction clutch of the locking clutch.
Repair Features
In the case of work of medium complexity, the valve body is removed and repaired. This operation requires topping up oil in a volume of 2.2 liters. During overhaul, the box is dismantled with torque converter repair. The clutch pack and the full oil also change. In case of minimal repair, the pan is removed, the solenoids are cleaned and the filter is changed. At the same time, about one liter of oil is added.
Important: if there is insufficient pressure in the box from a small volume of oil, this will lead to the burning of clutch bags.
The repair procedure itself should be performed at specialized services. No matter how simple the automatic transmission is, restoring it is not an easy operation. It is important not only to correctly install the parts, but also to correctly assemble the box.
Electronics
In addition to the mechanical part, with the Aisin 6-speed automatic transmission there can be electrical failures. So, the box has weak wiring harnesses, because of which the control signal may disappear.
In this case, specialists conduct computer diagnostics and read all errors. In “neglected” cases, only the replacement of the electronic control unit can help. But in most situations, repair is limited to replacing a set of electrical regulators. These include solenoids:
- Regulation of linear pressure.
- Clutch shifting qualities.
- Torque converter locks.
If you ride with such a malfunction for a long time, this will lead to burning of the discs and to a problem with the rest of the hydraulic plate solenoids.
Other malfunctions
Automatic Aisin has weaknesses. This is an oil pump and a stuffing box leak. If this problem is not resolved in time, this will lead to wear on the pump sleeve. The latter may soon also become worthless. Its malfunction is accompanied by a characteristic sound in the area of the transmission. At the same time, the blocking solenoid of the hydraulic transformer Aisin automatic transmission wears out.
Another problem that occurs with these boxes is spool plungers. They are in the design of the hydroplate itself. Their wear can cause unstable operation of the transmission in different modes.
To summarize
So, we found out what the Aisin automatic gearbox is. In general, this transmission is quite reliable. It does not have fragile nodes, as in the DSG or in the variator, and also more resistant to loads and overheating. But nothing lasts forever, so over time the box may require attention. Faults can be both mechanical and electrical. It is important to identify this at an early stage. Otherwise, one problem will entail a host of others. It is also worth noting that the selection of solenoid valves for six-speed Aisin boxes is made according to the vehicle's VIN number.