You can't.
Bring it to a dealer.
The tranny's on newer models are all "enclosed systems", which means Joe Tinkerer can't work on his own car anymore. You gotta bring it to the dealer so they can charge you to do a job that use to be easy enough to do all on your own. Nice, huh?
How to check trans fluid on a 1997 Isuzu Trooper
check your tranny fluid first
My Trooper did the same thing and I replaced the fluid and filter and added a separate trans fluid cooler and that fixed the problem.
the trooper has no dipstick for trans its a sealed system on the trans pan you will find a fill plug and a drain plug the one on top inrecess is the one your looking for with the truck in park running remove fill plug fluid level should be just below that hole you can use ur finger to tell
The Isuzu has a sealed transmission. It has a transmission fill plug on the side of the transmission above the pan, I believe on the right side of the trans case about midway the case body. Take the pan off remove and change filter. Add fluid by using an inexpensive pump until the fluid starts to run out the fill plug hole. Replace the plug. Job done.
There is a drain plug on the bottom of the transmission. To fill it, there is a plug toward the top of the transmission case where U have to pump the new fluid in till it starts to drain out.. There is no fill or trans. dipstick in top.
replace with 30w engine oil. anything heaver will burn out trans bearings.
Dextron 3
There is no dipstick for the trans.
it just resets the shift points on the trans. it allows you to hold a gear a little longer.
Use standard automatic transmission fluid mercon III
All you can do in your driveway is drop the trans pan, replace the trans filter, replace the trans pan gasket, install pan (no gasket sealer needed or required!) and refill what fluid drained out in the process which is aprox half of the fluid the trans holds. Take it to a trans shop if you want a complete fluid change. They will have the equipment to do a trans flush.