Self-Study Program

30
Shift logic
Gearbox subassemblies
367_033
Function assignments of the
electromagnetic valves
N90 controls clutch K3,
N91 controls the torque converter lockup clutch,
N92 controls clutch K1,
N93 controls the master pressure/system pressure,
N282 controls clutch K2 and
N283 controls brake B1.
Solenoid valves N88 and N89 are used for controlling
gearshifts from 4th to 6th gear and are activated
(energised) temporarily or alternately during
gearshift operations.
Solenoid valves N88 and N89 also control brake B2
in 1st gear - tiptronic mode (for the engine brake).
Legend of solenoid valve logic:
Solenoid valve is not activated (el. current
approx. 100 mA) or shift element open
Solenoid valve is activated (solenoid
valve open)
Solenoid valve is activated (el. current
approx. 1.0 A)
Corresponding clutch closed
Corresponding brake closed
Freewheel locked
The el. current applied to the solenoid
valve differs depending on its operating
state
T - in tiptronic mode (1st gear with engine
brake)
Z - solenoid valves are activated only
temporarily during gearshifts
Solenoid logic
3/2 valves Electronic pressure control valves (EDS)
Gear shifting component logic
P
N
First gear
Second gear
Third gear
Fourth gear
Fifth gear
Sixth gear
T
T/Z
T/Z
T
z
z
z
z
T
Clutches, brakes, freewheel
T/Z
Reverse (R) gear
Note
Function is inverse to electrical current applied,
since EPCVs N92, N93, N282 and N283 have a
falling characteristic. This means that a shift
element is operated if the corresponding EPCV
is not activated.