Adaptations Critical to Proper Shifts
In previous articles I have explained the important part that adaptations play in the shift quality and proper operation of a transmission. I have corrected many shift complaints from other shops that just could not get the transmission to shift properly simply by resetting the adaptations.
In this article I’ll use the VW 01M 2-3 shift to explain the hydraulic part of the adaptation. Let’s use the most-recent case I had, a ’99 VW New Beetle with a 01M transmission that had a slight binding feel on the 2-3 shift.
Hard Shift Remains after Reset of Shift Adapts
We recently received a 2002 Volkswagen Jetta, with a 09A five-speed automatic, with a complaint that it would not move. I determined that the fluid was burnt and black, indicating an internal failure. The check engine light was on and it had codes 00652 – gear monitoring not a plausible signal intermittent; 01045 – Tiptronic switch (F189) not a plausible signal intermittent; and 18032 – MIL request signal active (check TCM for errors) P1624. I drove the vehicle, and the transmission would slip and whine for about a block and then the vehicle would quit moving.
TF60SN (09G) Shift Complaints
Almost every transmission family ever produced has had weak spots or difficult areas to deal with, whether it is operation, diagnosis or assembly. The Volkswagen TF60SN (Aisin produced) is no exception.
One area of the TF60SN (09G) that has surfaced as troublesome is the valve body. In addition to the normal valve-body issues is the electrical concern. Today’s valve bodies not only have a ton of electrical do-dads to deal with, but the complexity of the items has also increased.
Volkswagen 09G or TF60: Clearing and Relearning Shift Adapts
Body of Evidence The 09G is an adaptive-learn transmission. The TCM can adapt the upshift and downshift pressures for each shift as well as initial engagement into drive and reverse. Whenever the transmission is rebuilt or the valve body is replaced the shift adapts should be cleared and the vehicle driven to relearn the new
Under Pressure: Sticking solenoid inhibits reverse engagement
With the quantity and price of solenoids becoming a substantial additional investment in the price of a transmission reman, testing and reclaiming the solenoids has become mandatory.
Blame the Torque Converter, Part 2
Last month, in Part I of “Blame the Torque Converter,” a 2001 Volkswagen Jetta and a 2002 Toyota Tundra were both thought to have faulty torque converters. Both vehicles had TCC-related trouble codes (the Jetta had a 740 code and the Tundra had a 770 code).
