Dual Clutch Transmission (DCT/DSG) is an automatic transmission based on a manual transmission with two clutches and a synchronizing and shifting mechanism similar to that of a manual transmission. The general structure and basic operating principle of the Volkswagen 02E Wet DCT is shown in the figure below.
The gear sets for each gear are (Fig. 1).
The K1 clutch (large plate) transmits power to the 135R gear.
The K2 clutch (small plate) transmits power to the 246 gear.
The 02E Dual Clutch Transmission has a gearshift fork as shown in Figure 2. The shift hydraulic fluid flows through the holes in the transmission housing to the hydraulic cylinders of the corresponding gear. As a result, pressure is exerted on the shift fork, pushing it to the left-hand or right-hand stop position or to the center position (neutral). If the gear is already in gear, the corresponding hydraulic cylinder is depressurized. The gear position is maintained by the backs of the shift teeth and the stop pins.
Frequently Asked Questions:
The 02e is most likely to report the fault code: p2711 shift program untrustworthy. Most problems will be prompted by the presence of this fault. Basically, it can contain the following types of faults: valve body problems, a series of problems containing solenoids, the hydraulic control system that acts as the clutch and shift forks to function properly. The failure rate is currently very high. The valve body will be the first consideration after the appearance of many shift program untrustworthy fault codes (Figure 3).
Clutch problem, easy to burn the plate, clutch oil ring and piston at the key inspection (Figure 4)
The internal fork piston tends to deteriorate, causing oil pressure to leak during fork operation (Figure 5).
The positioning slide sleeve on some of the forks is prone to damage, causing the forks to jam and report faults, accompanied by problems with the corresponding gears (Figure 6).
