Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Automatic Shift Strategy




1 - ABS control unit
2 - ABS sensors at wheels
3 - Speedometer
4 - Kickdown switch
5 - Digital Motor Electronics (DME) control unit
6 - Electronic transmission control unit
7 - Transverse acceleration sensor
8 - Selector lever system with two gates
9 - Cable
10 - Multi-function switch
11 - Automatic transmission
12 - Throttle with potentiometer
13 - Engine

The electronic Tiptronic control unit (6) is the information and command center of the entire system. A large quantity of information inputs that are compared with the stored driving or gearshift programs is used to generate commands that cause the transmission to execute or not to execute gearshifts.