Automatic transmission wont shift automaticly -
LinkBack Thread Tools
post #1 of 4 Old 12-04-2009, 09:47 AM Thread Starter
Registered User
Join Date: Mar 2009
Location: Michigan
Posts: 1
Automatic transmission wont shift automaticly

My automatic transmission wont shift automatically, It is stuck in Overdrive unless I shift it manually from 1st to 2nd to drive. Manually shifting is fine and no problems with the tranny but when left in drive when i start to drive it is in overdrive and I have to drop it in 1st and manually shift it as I drive. Anyone know why? It is a 1992 Jeep 4.0.

Last edited by for_givn; 12-04-2009 at 10:06 AM. Reason: more info
for_givn is offline  
Sponsored Links
post #2 of 4 Old 12-04-2009, 10:14 AM
Registered User
1995 YJ Wrangler 
Join Date: Feb 2008
Location: so cal
Posts: 49
Possibly the TCM.. Transmission control Module, located behind the glovebox, I had a similar problem and that was the cause.. there is a way to test it, you will have to search the forums for it.. hope this helps.

F-toy on Links 2.6 stroker, 4 sticks, rolling on 39" red labels, running on pane...95 YJ 4.0 A/T, 60s frnt and rear,4.56s,w/ ARBs, Atlas 4.3, 37" BFG Red labels, Full Black Diamond cage,.... 47 CJ2A 110"wb, 598bbc for power, 2spd glide, 17" travel, and a blast in the Dunes...
598BBC is offline  
post #3 of 4 Old 12-04-2009, 12:28 PM
Real Jeeps have dents
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 25,863
Most likely cause is the Throttle Position Sensor (TPS), especially if you recently crossed any deep water, ran a mud pit, or washed the engine. Test the TPS.

TPS Test

You should have 5 volts going into the TPS. At idle, TPS output voltage must be greater than 200 millivolts. At wide open throttle (WOT), TPS output voltage must be less than 4.8 volts.. The best is to use an analog meter (not digital) to see if the transition from idle to WOT is smooth with no dead spots. With your meter set for volts, put the black probe on a good ground like your negative battery terminal. With the key on, engine not running, test with the red probe of your meter (install a paper clip into the back of the plug of the TPS) to see which wire has the 5 volts. One of the other wires should show .26V (or so). The other wire will be the ground and should show no voltage. Move the throttle and look for smooth meter response up to the 4.49 at WOT.

Perform the test procedure again and wiggle and/or tap on the TPS while you watch the meter. If you notice any flat spots or abrupt changes in the meter readings, replace the TPS.


A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
CJ7-Tim is offline  
post #4 of 4 Old 12-04-2009, 06:01 PM
Web Wheeler
cruiser54's Avatar
1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott
Posts: 11,576
Do the 1992s have the TCU fuse taped up under the passenger side dash like the older models? If so, check there.
cruiser54 is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Cold transmission wont shift out of 1st gear sAe23 XJ Cherokee Technical Forum 38 07-01-2013 07:51 PM
1991 transmission wont shift in proper gear corbin9191 XJ Cherokee Technical Forum 6 01-27-2009 12:11 PM
Automatic or straight shift imaslammer XJ Cherokee Technical Forum 19 06-02-2008 09:02 PM
Shift Knobs for automatic transmissions 98tXJ XJ Cherokee Technical Forum 23 03-21-2007 08:18 AM
Automatic Shift Knob? Lagooz00XJ XJ Cherokee Technical Forum 9 12-02-2004 04:12 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome