Automatic Transmission/Transaxle: Description and Operation

AUTOMATIC TRANSMISSION 01M, GENERAL INFORMATION
There are several fundamental differences between the 4-speed automatic transmission 01M and the previous automatic transmission. These changes are briefly mentioned below.

Transmission
The 4-speed automatic transmission 01M is equipped with 4 hydraulically activated forward gears. When the lock-up clutch is closed these forward gears become mechanically driven gears by cutting out the torque converter slip.

Torque Converter
The torque converter for the 01M transmission is equipped with a lock-up clutch. The lock-up clutch is closed depending on load and speed and drives 1st, 2nd, 3rd and 4th gears mechanically independent of slip.

Transmission Control Module (TCM) with gear changes based on driving situation (Fuzzy Logic)
Advantages:
- Gear Changes Fuel Consumption Orientated
- Maximum engine output always available
- Individual adaption of gear change points for all driving situations
- Gear change points are infinitely variable

Gear Change Point Variations For Gradients
An additional gear change map automatically selects gear changes for gradients dependent upon Accelerator Pedal position and driving speed.
- Gear change map for extreme uphill stretches is matched to engine output changes fuel consumption orientated
- Gear change map for extreme downhill stretches is matched to the braking effect of the engine

New ATF For Volkswagen (VW ATF)
The VW ATF has a yellowish color.

The transmission final drive and planetary gearbox are filled with VW ATF.
- The ATF dipstick has been discontinued, the ATF level is checked using a new procedure.
- Checking the ATF level or changing the ATF is now performed during the inspection service.
- Only VW ATF must be used.

NOTE: Only the VW ATF, or equivalent, available as a replacement part can be used in the automatic gearbox 01M.