https://clubmusso.com.ar/viewtopic.php?f=37&t=11642&p=157547#p157547
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mariano68
Martes, 25 Septiembre 2012, 19:29

Re: No Entra La Marcha Atras, Caja BTRA
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[quote name='daveholland' timestamp='1348046540' post='114233']
From my experience(2001 TD SE Auto), the transmission fluid (the dreaded gold-plated, diamond-crusted TQ95) probably needs topping up or possibly changing.
- Problems like this seem to be unusual - mine used to slam down from 4 to 3 which at 60 mph is a bit unnerving!
- But I think the fluid is your first check - but you'll have to search about to find some.
- Whatever you do, do NOT use any other fluid - you'll be buying a new box if you do (plenty of info about that in the forums!).  

I paid a dealer to drain and refill about 5 years ago and they reported that it was dirty black when they did the changeover.

- There are threads about doing this... it's fill to overflow because you have no dipstick - time consuming but not too bad.

Check for vacuum leaks as well - I have an after market cruise control and a broken T-piece really confused it.

There is a Throttle Calibration procedure - I found it ages ago on a club thread and saved it on to a Word document.
- I will send it to you via pm.  It can't hurt to try it.

btw:  Mine is still hesitant after starting to engage forward or reverse - a little blip on the accelerator seems to make it "grab" the gear then it's fine.

If its not the fluid then you need to check the sensors - there are threads about this too.

Best of luck!
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Esto es del foro ingles, le mande un pm al moderador para que me envíe ese documento por mail, pero en definitiva plantea lo mismo, posible problema de vacio o aceite.