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Valve body repair Audi A3 Q3 TT / VW Passat Golf / Skoda Superb 02E DQ250 DSG 6

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  • Brand: MAKTRANS-VB
  • Product Code: remontg02E
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  • Weight (kg): 10
  • Availability: 19967
$800.00
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Repair types

Repair of valvebody solenoids of automatic transmission A3, Q3, TT, Passat, Golf, Superb DQ250 02E

Audi A3, Q3, TT
SEAT Leon, Toledo
SKODA Octavia, Superb
VOLKSWAGEN Caddy, Beetle, Golf, Jetta, Passat, Scirocco, Shara, Touran

The six-speed automatic transmission DQ250 02E is an in-house development of VAG together with BorgWarner Inc.

Wet double-clutch box allows you to transfer torque to 350 H * m. The mechanical part of the gearbox is controlled via an electromechanical mechatronics unit. Mechatronics consists of an electronic control unit and a valve body equipped with sensors and solenoids.

Solenoids of gear shift, clutch and pressure adjustment are distinguished depending on the task being performed.

Solenoid N 217 is responsible for adjusting the pressure of the hydraulic fluid in the main flow of the valvebody. The pressure varies depending on the temperature, speed and mode of operation of the automatic transmission. The electronic control unit periodically corrects the value of the main pressure in accordance with the operating conditions of the gearbox. If the main pressure solenoid valve fails, the operation of the valvebody will continue with the maximum hydraulic pressure. In this case, the shifts are accompanied by thumps and jerks, which, in addition to reduced comfort, lead to premature wear of the clutch and shift system.

Solenoid N 218 refers to the cooling system. The main cause of overheating of the automatic transmission oil is the clutch K1 and K2. When the torque is transmitted between the clutch discs, friction occurs and, as a result, heat is generated. A special cooling circuit is used to cool the oil. The oil cooling circuit lowers the temperature and cools the clutch. N 218 solenoid ontrols the cooling circuit .If the solenoid is not working correctly, the oil temperature may exceed the permissible values ​​(135 degrees), which will adversely affect all automatic nodes (clutch failure, electronic sensors, esolenoids).

Also in the case of oil overheating, a protection is triggered, which is expressed in decreasing engine torque or when the clutches are fully opened (no moment is transferred to the box) - the car completely stops. Overheating significantly shortens service life and requires frequent replacement of hydraulic fluid.

To help diagnose solenoids, Maktrans experts use modern equipment that allows you to repeat the work of a solenoid in the real conditions of the car.

The main cause of solenoids failure is work in contaminated oil. Particles of chips and burnt oil form a finely dispersed suspension that clogs the oil channels. Getting on the rubbing parts, polluted elements cause premature  wearout of the surface, incl. wear of the solenoid bushing, which leads to jamming.

An example of a worn out bushing of a solenoid. The center hole of the bushing is worn out.

To solve the problem, the specialists of the company Maktrans developed the technology of solenoid repair.
In the beginning, the solenoid is disassembled, using a special tool.

Further, the worn out bushing is removed and a new bushing made by the specialists of the company Maktans is installed in its place.

Manufacture of bushings is performed on modern CNC machines, which allows to comply with modern tolerances on the accuracy of the manufactured parts 

After repair, the solenoids are retested for compliance with the operating parameters.

At the end of testing, the restored solenoid is installed in the valve body. Next adaptation and control of the automatic transmission work is held during road tests.

The solenoids, restored by the technique of the Maktrans company specialists , correspond to the performance of the original solenoids of the automatic transmission DQ250 02E. The service life after the rrepair is comparable with the life of new parts, at a much lower cost.

Solenoids of pressure regulators N215 and N216 are in charge of changing the oil pressure in the system responsible for the operation of the clutch. The solenoid N215 is in charge of the clutch K1, and the solenoid N216 is responsible for the K2 clutch. If the safety solenoid fails, the corresponding series of gears is disconnected:

- When disconnecting the first series of gears (K1), the car can only move on the second gear.
- If the second gear set (K2) is disconnected, the car can move on the first and third gears.

To determine the operability of the solenoids, Maktrans specialists use modern diagnostic equipment to accurately determine the presence of a malfunction.

This is the graph of the problem solenoid. Stepped areas indicate a solenoid valve being stuck. Over time, such  solenoid can jam.

And this is the graph of the solenoid in working order

To solve the problem with safety solenoids K1 and K2, Maktrans company specialists  recommend a replacement for new ones, with a guarantee of 1 year.

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