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98 Cherokee won't shift into overdrive

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Old 01-17-2011, 08:33 AM   #1
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Default 98 Cherokee won't shift into overdrive

let me explain my vehicle first so we know what we are asking about. It is a 1998 Cherokee SE with 4.0 engine aw4 trans. and this is a right hand drive jeep. so last month the thing would shift into overdrive and run fine then i would notice sometimes it wouldn't shift into OD or it would shift from 3 into OD and go back and forth a couple times before it made up its mind. so I checked the trans. fluid and it was low and had been overheated(I had just changed fluid maybe 2,000 miles before problems began.) So I went to autozone bought new fluid and drained what was in it. when I got under the jeep I noticed my trans. pressure line going to the cooler had been pinched flat so i know why my fluid smelled burnt and had been overheating. i fixed that drained trans. fluid had it flushed and refilled fluid. Now I have completely lost OD. it won't attempt to shift into it. I have replace the TPS adjusted the TV cable. I took off the NSS and cleaned it inside and out. I now assume it could be my Trans. Control Module or trans. solenoid. I have been told I can test solenoids without having to drop trans. pan by unplugging TCM and testing connector. I have never used a mulitimeter and only assume I set it to ohms and use positive lead. Do I use the negative lead? Also if solenoids check out ok can I test the TCM? and honestly I have seen the price Autozone and others are asking for the TCM would you recommend getting one from a salvage yard out of a another cherokee? Thanks Nathan

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Old 01-17-2011, 08:42 AM   #2
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does it have a detent cable if so you should try to adjust it cant hurt trying
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Old 01-17-2011, 09:00 AM   #3
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umm what is the detent cable and where is it located and i could tell you lol.
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Old 01-17-2011, 09:04 AM   #4
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on throttle body controlls trans pressure
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Old 01-17-2011, 09:07 AM   #5
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with vechicle not running depress button on cable have some one push gas pedal to floor cable will self adjust then release button on cable then release gas pedal worth a try
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Old 01-17-2011, 09:12 AM   #6
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oh yeah yes I did adjust it i was told it was called a TV cable. so i just started calling it that. I found a diagram that shows which contacts to test on the TCM but it only showed where to put positive lead of multiemeter. It doesn't show where to put negative lead so I assume I will just find a ground to touch it to under the dash somewhere. Also if solenoids check out can I go under the assumption that it is the TCM. I did have vehicle at autozone and codes were pulled p0751 p0700. Thanks for any help.
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Old 01-17-2011, 09:18 AM   #7
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sent you a pm
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Old 01-17-2011, 04:32 PM   #8
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ok so i got under the drivers dash and tested my solenoid using an old old cheap ohm meter and what i did was tested c14, c15, c16 all got about 10 ohms. but i grounded to the drivers seat bolt so i don't know if i did it right but i am going to get a new meter and try again
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Old 01-18-2011, 05:35 PM   #9
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SO I hope I am not starting to get annoying with my questions but here is how its going. I was going to test the Solenoids by unplugging the TCM and using a mulitimeter to check ohms. but the only diagram I could find was for a 89 AW4 such as the one in the first attachment. But when I unplugged my TCM my plug looks like the plug in Attachment 2. What I would like to know is what wires test what. I would like to test all three trans. solenoids and test the TPS from there. I found a site that showed how to test it but again it had a four wire TPS and mine is a 3 wire. please help
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98 Cherokee won't shift into overdrive-89-aw4.jpg   98 Cherokee won't shift into overdrive-98-tcu.jpg  
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Old 01-18-2011, 06:27 PM   #10
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Quote:
Originally Posted by freegdr View Post
does it have a detent cable if so you should try to adjust it cant hurt trying
He already did thats what the TV cable is......
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Old 01-18-2011, 06:34 PM   #11
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Quote:
Originally Posted by Hagar44 View Post
ok so i got under the drivers dash and tested my solenoid using an old old cheap ohm meter and what i did was tested c14, c15, c16 all got about 10 ohms. but i grounded to the drivers seat bolt so i don't know if i did it right but i am going to get a new meter and try again
http://www.transonline.com/transdige...ers/index.html

Here is what you need..i used this to find out why my Converter was not locking up on the Highway....Turns out i had a Solenoid Shorting out when getting hot. Common for them....

if you need new ones..

http://www.bulkpart.com/Merchant2/me...e=A340solenoid
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Old 01-19-2011, 08:35 PM   #12
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ok that site you posted makes the diagram I have look more simple. But the thing that still concerns me is that the posted website shows the tcu connector being a connector with two rows of 16 pins. My connector on my jeep has 2 rows of 13 pins. I will assume that the same color wires are used on both since the are AW4 trans. I will try that anyways by using wire colors from website to ones in my jeep and see where that gets me.. I have tried another TCU from the Junkyard. I know an owner of one and can pretty much get free stuff so I thought it was worth a try. I am too the point that I believe it is a solenoid. Thanks everyone for the help and ideas I do appreciate them, Nathan
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Old 01-20-2011, 05:22 PM   #13
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It may be a Solenoid...I'll hope for you.

But if you had a Pinched Cooler line and Burnt Fluid....your trans may be cooked.
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Old 01-20-2011, 06:06 PM   #14
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yeah I am wishing it was simple as a solenoid but I am going to start assuming it is the trans being cooked. I don't want to believe it cause its money to fix but I am getting there lol. I have no idea how long i did drive it with the pinched trans line so how ever long it took for fluid to burn up and start causing shifting problems and thats how i caught it. Just didn't catch it soon enough. I still have everything just no overdrive. So I think what I am gonna do is instead of spending the money on a trans rebuild I will use the money on a down payment to a newer Right Hand Drive Wrangler. and just leave the cherokee as is and use for my back up vehicle.
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Old 06-19-2012, 11:07 AM   #15
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I was going through this and found that my '98 has the dual 13 pin connector as well. Anyone have access to the diagrams for the newer connectors?
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