transmission problem - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 09-30-2016, 04:23 PM Thread Starter
jim-m
Registered User
 
Join Date: Sep 2016
Posts: 7
Xj transmission problem

1995 jeep cherokee xj 4wd 4.0. trans shifts at very high rpms. check engine light working but not showing. replaced iac,tps, and trans output speed sensor. any suggestions. only about 101,000 mi. fluid ok.

jim-m is offline  
Sponsored Links
Advertisement
 
post #2 of 20 Old 10-01-2016, 09:13 AM
CJ7-Tim
Real Jeeps have dents
 
CJ7-Tim's Avatar
2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 28,572
Adjusted the kick down/throttle valve cable ? Considered a good used Transmission Control Unit from the junkyard ?

.
“When the people find that they can vote themselves money, that will herald the end of the Republic.”

- Benjamin Franklin
CJ7-Tim is offline  
post #3 of 20 Old 10-02-2016, 07:05 PM Thread Starter
jim-m
Registered User
 
Join Date: Sep 2016
Posts: 7
jim-m

adjusted kick down no luck. will a half qt. of the wrong fluid affect shifting?
jim-m is offline  
 
post #4 of 20 Old 10-03-2016, 04:47 AM
CJ7-Tim
Real Jeeps have dents
 
CJ7-Tim's Avatar
2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 28,572
1/2 qt shouldn't make any difference.

.
“When the people find that they can vote themselves money, that will herald the end of the Republic.”

- Benjamin Franklin
CJ7-Tim is offline  
post #5 of 20 Old 10-03-2016, 04:16 PM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 12,148
Try this:

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

If you own a Renix Jeep, you must check this out:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My Jeep technical photos:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cruiser54 is offline  
post #6 of 20 Old 10-05-2016, 07:02 PM Thread Starter
jim-m
Registered User
 
Join Date: Sep 2016
Posts: 7
checked connectors cleaned and sprayed, no tcu inline fuse under dash.did vacuum test. had trans flushed w/ conditioner and new fluid. no luck. still no engine light warning,bulb is working. can't find a obd1 anywhere to check. any way to test tcu?
jim-m is offline  
post #7 of 20 Old 10-06-2016, 03:27 AM
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali
Posts: 7,851
Have you checked the line pressure at the test port on the trannie? At wide open throttle should be 170-210 psi.

If it is not you have a faulty pump, a faulty valve or dirt.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline  
post #8 of 20 Old 10-06-2016, 05:39 AM
75SV1
Registered User
 
Join Date: Sep 2003
Posts: 1,946
Check voltage at the battery. Then check what voltage is going into the TCU. Also, check the brake light switch. They get corroded.
75SV1 is offline  
post #9 of 20 Old 10-06-2016, 11:12 PM Thread Starter
jim-m
Registered User
 
Join Date: Sep 2016
Posts: 7
battery and alt volts fine. what does brake light switch contacts have to do with trans not shifting until high rpms are achieved ? shifts from 1st to 2nd about 3500 rpms. shifts into reverse or forward gear no problem. does not shift manually shifts great no clunks no slippage. no off road or towing.
jim-m is offline  
post #10 of 20 Old 10-06-2016, 11:45 PM
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali
Posts: 7,851
Does not shift manually?

If you disconnect the TCU can you get it to move from gear to gear with the shifter? From memory I think it will go R, 1, 3 and 4 on the shifter. This is the first test in the FSM.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline  
post #11 of 20 Old 10-07-2016, 05:31 AM
75SV1
Registered User
 
Join Date: Sep 2003
Posts: 1,946
Quote:
Originally Posted by jim-m View Post
battery and alt volts fine. what does brake light switch contacts have to do with trans not shifting until high rpms are achieved ? shifts from 1st to 2nd about 3500 rpms. shifts into reverse or forward gear no problem. does not shift manually shifts great no clunks no slippage. no off road or towing.
I'd have to look as to what the brake light switch specifically affects. It is part of the loop in this system. Also, the selector switch on the passenger side of the trans. Blanking on what it is really called.
75SV1 is offline  
post #12 of 20 Old 10-07-2016, 07:00 AM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 12,148
Quote:
Originally Posted by BagusJeep View Post
Does not shift manually?

If you disconnect the TCU can you get it to move from gear to gear with the shifter? From memory I think it will go R, 1, 3 and 4 on the shifter. This is the first test in the FSM.
Correct.

If you own a Renix Jeep, you must check this out:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My Jeep technical photos:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cruiser54 is offline  
post #13 of 20 Old 10-07-2016, 07:55 AM
CCKen
Web Wheeler
 
CCKen's Avatar
1999 XJ Cherokee 
 
Join Date: Jul 2011
Location: Canton
Posts: 3,548
Quote:
Originally Posted by 75SV1 View Post
I'd have to look as to what the brake light switch specifically affects. It is part of the loop in this system. Also, the selector switch on the passenger side of the trans. Blanking on what it is really called.
A defective Brake Lamp Switch may prevent the trans from going into overdrive, not what the OP is seeing.

The selector switch on the passenger side of the trans is the Transmission Range Sensor, aka NSS.
CCKen is offline  
post #14 of 20 Old 10-07-2016, 09:06 AM
CCKen
Web Wheeler
 
CCKen's Avatar
1999 XJ Cherokee 
 
Join Date: Jul 2011
Location: Canton
Posts: 3,548
Quote:
Originally Posted by jim-m View Post
battery and alt volts fine. what does brake light switch contacts have to do with trans not shifting until high rpms are achieved ? shifts from 1st to 2nd about 3500 rpms. shifts into reverse or forward gear no problem. does not shift manually shifts great no clunks no slippage. no off road or towing.
Is shifting from 1 to 2 your only problem? Or is there a problem going from 2 to 3 as well?
CCKen is offline  
post #15 of 20 Old 10-07-2016, 09:38 AM
Timo_90xj
Web Wheeler
 
Timo_90xj's Avatar
1998 ZJ 
 
Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Posts: 10,658
"Not shifting manually" - we need more info on this. Does it not shift manually at all, and only shifts in "D" from 1st to 2nd at 3500rpms? Or shifts fine in "D", but in manual mode shifts from 1st to 2nd at higher rpms?

As was asked, is the only problem the 1-2 gearchanges, and 2-3 and 3-OD are fine? When/ how does it shift into lower gears in D? Can you manually select lower gears if tranny is in higher gear?

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
Timo_90xj is offline  
Reply

Quick Reply
Message:
Options

Register Now



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

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

Password:


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



Email Address:
OR

Log-in











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



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