Question about 1990 Isuzu Trooper

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Tranny wont shift out of first gear

It will shift through all gears then a few seconds it will quickly downshift to 1st.... then it goes really high in rpms and the check trans light comes on. I have heard it may be a TCM problem but i dont know.

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  • froboy Nov 10, 2008

    i will try that.... autozone says they check TCM's

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  • 96 Answers

It very well may be a TCM problem. Try to pull the codes out of the computer. It might be a a bad sensor too.

Posted on Nov 07, 2008

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1 Answer

Transmission hard shifting


RTM
A./T are complex.
A/T has limphome mode, too, some skip gears.
the FSM has many on car tests, you should read that.

Every 1991 and newer Suzuki with A/T 4 speed or more, not 3.
has a tranny brain "TCM", and can be reset. (inside the BCM/or PCM in yours, moved back in 1997) RTM.
if you dont read the manual on how, then pull the battery for 30mins, bingo all is reset.
you must drive car for ECU and TCM to trim the engine and tranny. (learn)

the ECU can be scanned with any scan tool (USA) are you? in USA? and you can see tranny codes , DTC'S, go them.
that be first, scan it and get the codes and figure them out
using , yes, books.
if no FSM for your car, get one fast now that suz, is chapter 11 here. (oops, consider that, and future...)
but is here always, USA.
alldata dot com

http://www.scantool.net/software/alldata-diy-1-month-subscription.html

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