Notices
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Sponsored by:
Sponsored by:

Transmission Question?

Old 05-07-2019, 12:57 PM
  #1  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default Transmission Question?

Disclaimer: this is my first Jeep. Itís a 1990 Cherokee XJ. That being said I am also pretty new to working on cars. When I purchased my Cherokee a couple of weeks ago, the guy said I would need to ďchange the valve on the side of the transmission because it has issues shifting sometimesĒ now, I am looked high and low on the Internet, and canít find anything regarding my Jeep and a transmission valve. All I can think of is a transmission modulator/selector valve bit I canít find anything about my make and model. Any advice? (Would prefer not to take it to a mechanic as I want to learn how to take care of my Jeep myself) thanks!
snjohns1026 is offline  
Old 05-07-2019, 02:03 PM
  #2  
CF Veteran
 
Join Date: Nov 2017
Location: Groton, MA
Posts: 2,856
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
Default

A 90 XJ uses the AW4 automatic. I've never heard of any valves or any reports of failure. As I understand the shifting is controlled by solenoids that are sometimes in need of replacement.
PatHenry is offline  
Old 05-07-2019, 02:09 PM
  #3  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default

PatHenry See, I didnít know that. Thanks! So I should check the solenoids? Basically itís having issues shifting, kind of has a rough idle.
snjohns1026 is offline  
Old 05-07-2019, 02:31 PM
  #4  
Junior Member
 
Stickers_XJ's Avatar
 
Join Date: Aug 2017
Location: Long Island
Posts: 53
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
Default

I have a '90 XJ as well. There should be a 7.5 amp fuse under the driver's side dash for the Transmission Control Unit. Absolutely test that fuse before anything else. I bought a kit at Walmart with a fuse tester and a variety of fuses for only a few bucks. Mine also generally has a more rough idle than some other models but I'm not sure if that would be related to the Transmission



It's the one labeled Trans

Last edited by Stickers_XJ; 05-07-2019 at 02:33 PM. Reason: Forgot to post image
Stickers_XJ is offline  
Old 05-07-2019, 02:37 PM
  #5  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default

Stickers_XJ thank you! I will absolutely test that when I get off work today and make sure thatís not my issue! (Fingers crossed that itís just a faulty fuse and nothing worse)
snjohns1026 is offline  
Old 05-07-2019, 08:39 PM
  #6  
CF Veteran
 
Join Date: May 2012
Location: Lost in the wilds of Virginia
Posts: 4,527
Year: 1998 Classic (I'll get it running soon....) and 96 (just purchased) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Default

The solenoids are inside the trans, not on the side. Sounds like he got a bit of knowledge garbled. There are three of them, and to test them you must drop the pan. Not a difficult job, but it does require buying a new gasket. If you have one of the pans that does NOT have a drain plug, do yourself a favor and install a drain plug while you're at it. Most auto parts stores sell a universal plug that can be installed in just about any steel pan. Some suggest not testing, but just replacing. The three are the same part, just operating different parts of the trans.

But before you go to all that trouble, check your trans fluid. If it's dark, try a transmission fluid replacement. See my sig, #3.




Here's a good post on the solenoids:

https://www.cherokeeforum.com/f2/199...7/#post3113066

And a good general troubleshooting post on the trans:

https://www.cherokeeforum.com/f2/aw4...9/#post3140963


These are both from an old-timer who used to work for Chrysler. His advice is rock solid. (Except on the subject of dielectric grease!)
BlueRidgeMark is offline  
Old 05-07-2019, 08:44 PM
  #7  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default

BlueRidgeMark i will definitely check the transmission fluid in the morning, I checked my fuse and itís fine, so hereís hoping that itís just the fluid and not the solenoids
snjohns1026 is offline  
Old 05-07-2019, 08:59 PM
  #8  
Member
 
Join Date: Dec 2017
Posts: 181
Model: Cherokee(SJ)
Default

"Side of the transmission" makes me think he was refering to the NSS? Also check that the cable between the throttle body and the transmission is correctly adjusted, as that can cause sluggish or harsh shifting if way out of adjustment.
lawsoncl is offline  
Old 05-07-2019, 09:03 PM
  #9  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default

lawsoncl sluggish/harsh shifting would describe it pretty well. I will definitely be sure to check!
snjohns1026 is offline  
Old 05-08-2019, 08:16 AM
  #10  
::CF Moderator::
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,745
Year: 1990
Model: Comanche
Engine: 4.0
Default

could be a number of things, but do the basics first and ignore anything the previous owner told you.

You MUST go to www.cruiser54.com and complete Tips 1 through 5 and Tip 10. This could be as simple as a bad ground at the dipstick tube stud.
cruiser54 is offline  
Old 05-08-2019, 07:25 PM
  #11  
CF Veteran
 
Join Date: May 2012
Location: Lost in the wilds of Virginia
Posts: 4,527
Year: 1998 Classic (I'll get it running soon....) and 96 (just purchased) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Default

Originally Posted by cruiser54 View Post
could be a number of things, but do the basics first and ignore anything the previous owner told you.

That's excellent advice no matter what the issue is.
BlueRidgeMark is offline  
Old 05-19-2019, 12:30 PM
  #12  
Newbie
Thread Starter
 
Join Date: May 2019
Posts: 7
Model: Cherokee (XJ)
Default

cruiser54 late reply here on my part but I finally got a chance to sit down and look at that list and apply it, started at step 1 but ran into my first problem- thereís nothing attached at the dipstick ground. If anyone has any ideas why that might be or how I can figure out where that ground was moved to that would be great. For now I will refresh the grounds I can find and work from there. Thanks again for your help!
snjohns1026 is offline  
Old 05-19-2019, 05:18 PM
  #13  
::CF Moderator::
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,745
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by snjohns1026 View Post
cruiser54 late reply here on my part but I finally got a chance to sit down and look at that list and apply it, started at step 1 but ran into my first problem- thereís nothing attached at the dipstick ground. If anyone has any ideas why that might be or how I can figure out where that ground was moved to that would be great. For now I will refresh the grounds I can find and work from there. Thanks again for your help!

Sometimes they're moved forward to another engine block bolt. It's a cluster of black wires with eyelets.

They originate kinda near the firewall and auto trans dipstick.






cruiser54 is offline  
Old 05-20-2019, 11:43 AM
  #14  
Seasoned Member
 
downs's Avatar
 
Join Date: Oct 2018
Location: Hunt County Texas
Posts: 487
Year: 1995
Model: Cherokee (XJ)
Engine: 4.0L
Default

You can test the solenoids from the TCU connector or engine bay connector without dropping the trans pan. But do what Cruiser's faq says to do, guy knows his stuff.
downs is offline  
Old 05-20-2019, 03:41 PM
  #15  
::CF Moderator::
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,745
Year: 1990
Model: Comanche
Engine: 4.0
Default

Excerpt from Tip 1:

The Renix era XJs and MJs were built with an under-engineered grounding system for the engine/transmission electronics. One problem in particular involves the multiple ground connection at the engine dipstick tube stud. A poor ground here can cause a multitude of driveabililty issues, wasted time, failed emission tests, and wasted money replacing components unnecessarily.

All the components listed below ground at the dipstick tube stud:

Distributor Sync Sensor, TCU main ground, TCU “Shift Point Logic”, Ignition Control Module, Fuel Injectors, ECU main ground (which other engine sensors ground through, including the Oxygen sensor, Knock Sensor, Cruise Control and Transmission Sync signal. All extremely important stuff.
cruiser54 is offline  

Thread Tools
Search this Thread
Quick Reply: Transmission Question?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description: