88 comanche 4.0 4wd when I put it in drive it will not shift on it's own , it seems to start out in 2nd or third??, If I manually pull it to the 1-2 position it shifts into first then 2nd and when put in the 3 position and D it appears to go into each gear. it sat for 6 months prior yesterday and seemed fine when last drove 6 months ago. Anyway, I have checked all grounds, the one by the dipstick, unplugged all connectors and checked fuses, tried a different tps ect ect.........the tcm fuses is good and I have power and all grounds to tcm as i unplugged it and checked them. i pretty much followed cruise54's write up and still won't shift on it's own.....now the od thing is according to wiring diagram when the prndl switch is in the "d" position i should have power to tcm on c8 pin at tcm connector and then in the 1-2 position power on c9 pin at connector and i do however no power at c8 when in d but if i move the shifter to 3 then i do have power on c8 no sure if this is a diagram error or an issue in the prndl switch......when i opened up the tcm this afternoon i could see green corossion on a small resistor going into the circuit board.........I don't wanna throw parts at this I want to fix the issue, any ideas?? Bad tcm? Am I missing anything? I'd like to message cruiser 54 but i'm to new a member and don't have pm access yet

 

anyone? or does anyone have a good tcm I could try or know where to get one??? when i opened up mine there was a resistor in one spot that had green fuzz on it and a suspicious area on the board, so i think it may be a bad tcm??

 

https://cruiser54.com/?p=19

https://cruiser54.com/?p=58

There is a fuse for the TCU also.

 

yeah I know that I mentioned in my post that I had already checked that and it was good, and I checked for power up at the TCM and it has that and all grounds

 

Sorry about not reading your post thoroughly this morning. I would try a used TCU from another REnix Jeep.

 

where and from what years can i source one?

 

87 to 90 4.0.
Junkyard is your best bet unless someone here has one to sell.

I just posted this early this morning on here, Jeep Forum, NAXJA, and Comanche Club.

https://www.cherokeeforum.com/f2/ren...9/#post3699257

 

so it can be from a cherokee

 

Absolutely!!

 

thanks man!! the sooner i fix this the sooner i can sell it!!

 

where are you located?

 

maryland

 

https://www.cherokeeforum.com/showth...6&goto=newpost

 

do you have any trans modules for an 88 commanche?? io saw a thread listed where you were selling some?? i'm at the point now where i'm trying to get mine ready for use here this winter and need to do a lot of repair asap....let me know thanks

 

https://www.cherokeeforum.com/f88/mj...e-club-271112/