98 zj overdrive not working!

C.Berry

Bad News
Joined
Aug 10, 2008
Location
Blacksburg, Va
Picked up a 98 zj with 5.2 for cheap over weekend o/d doesn't work in it anyone have and idea what is causing this it shows a coolant sensor bad but Po said he replaced it I've researched and some say it's due to excessive heat causing trans to run retard mode any truth to this or do I need to dig more?
 
FWIW I had a 97 ZJ W/ 5.2 and would skip in and out of overdrive. Finally found out it was the brake switch on the pedal under the dash. Maybe a long shot....
 
Worth checking out
 
Does the 5.2 have two sensors by chance one or gauge and one for computer? Possible the Po installed a bad one out of box I'm gonna replace it and see how it does!
 
Had the same problem with a 99 or 2000 model. Soldered in a resister to simulate good trans temp & never had another problem with it
 
I'm a terrible electrician I won't lie so soldering in stuff to mother boards and computers may be over my head I'm hoping its a 17$ CTS bc I got the jeep for dirt cheap and it runs great!
 
It may be the trans temp sensor.... What transman was saying to do was just wire s resistor the harness, not anything relating to opening up the pcm.
 
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