01N Automatic Transmission

"Automatic transmission 01N", general information
Maximum possible care and cleanliness, as well as proper tools, are essential for satisfactory and successful transmission repairs. All general rules of basic workshop safety also apply when repairing any transmission.
A number of general instructions that apply to most individual repair procedures-otherwise listed at several other points-are summarized here.

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

Transmission
The 4-speed automatic transmission 01N 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 torque converter slip.

Self-diagnosis
For 1998> Passat 4-speed automatic transmission On-Board Diagnosis (OBD). Refer to Transmission Control Systems.