1989 MJ Auto Trans shiffting issue any help? - Pirate4x4.Com : 4x4 and Off-Road Forum

Xj in Va · 01-25-2010, 05:11 PM

This MJ has a wierd shifting problem. Whatever gear it is in in the gate is the gear you are in. If you shift to 3rd, it is starts out in third, if you shift into OD it starts out in overdrive. I have switched in new shifting selnoids. Didnt work. I have swaped in a rebuilt trans I had from my same year XJ. Same damn problem. This leads me to believe it is a computer related? Tranny computer? If its not mechanical....this is where I become lost. Any help would be great thanks.

PornstaR · 01-25-2010, 06:23 PM

Might want to have this moved over to the "non-hardcore" section. You prolly get a quicker response

R.DesJardin · 01-25-2010, 09:00 PM

This is just a guess since I'm not there to drive it and check it out, but yes it sounds like the TCM(tranny computer) is not working properly. The TPS is often the culprit but this usually leads to improper shifting as compared to no shifting. Check the fuses, wiring from trans. to TCM could be just something that simple. Good luck.

JENSSEN · 01-25-2010, 09:15 PM

I would start by checking the 10 amp fuse onset the dash on the passengersude close to the tranny ECM

Xj in Va · 01-26-2010, 10:43 AM

the fuse closest to the TCM is not blown. I have another TCM that is in my XJ not being used. I am going to switch that now and see if anything changes. I will update later. Thanks again.

Joe

JENSSEN · 01-26-2010, 12:38 PM

Quote:

Originally Posted by Xj in Va

the fuse closest to the TCM is not blown. I have another TCM that is in my XJ not being used. I am going to switch that now and see if anything changes. I will update later. Thanks again.

Joe

Make sure you have power to the fuse connector,.. see if it acts the same way with the fuse out,...

Xj in Va · 01-26-2010, 08:33 PM

Ok after all that it was the damn TCU the whole time. That sucks, a whole lot of work for a 5 minute repair. Oh well, now it has a rebuilt trans in it before I sell it. Anyone interested in a comanche nice comanche? Anyone have a good set of 31? or some random 32x10.50tsl?? Thanks for help getting it fixed!!

Phoenix Fire · 01-29-2010, 07:45 AM

how much for the MJ? PM me and we can talk! I need to replace mine after rolling it a few times.

01-25-2010, 05:11 PM	#1 (permalink)
Xj in Va Registered User Join Date: Nov 2001 Member # 8042 Location: Virginia Beach, VA Posts: 71	1989 MJ Auto Trans shiffting issue any help? This MJ has a wierd shifting problem. Whatever gear it is in in the gate is the gear you are in. If you shift to 3rd, it is starts out in third, if you shift into OD it starts out in overdrive. I have switched in new shifting selnoids. Didnt work. I have swaped in a rebuilt trans I had from my same year XJ. Same damn problem. This leads me to believe it is a computer related? Tranny computer? If its not mechanical....this is where I become lost. Any help would be great thanks. __________________ 1989 XJ - 350-th350-205, d60-14b

01-25-2010, 06:23 PM	#2 (permalink)
PornstaR Registered User Join Date: Apr 2003 Member # 18531 Location: Graham Washington Posts: 122	Might want to have this moved over to the "non-hardcore" section. You prolly get a quicker response __________________ [QUOTE=weedwacker;9581606]It ain't perfect but it works well if lubed. [/QUOTE]

01-25-2010, 09:00 PM	#3 (permalink)
R.DesJardin Shifting for all Join Date: Feb 2006 Member # 68266 Location: Arlington, WI Posts: 1,203	This is just a guess since I'm not there to drive it and check it out, but yes it sounds like the TCM(tranny computer) is not working properly. The TPS is often the culprit but this usually leads to improper shifting as compared to no shifting. Check the fuses, wiring from trans. to TCM could be just something that simple. Good luck. __________________ *RADesigns Products LLC - Shift to the Best* The 2nd Amendment is not to be screwed with, I am a card carrying member of the NRA. If this offends you please don't buy my products. http://radesignsproducts.com/Accessories.html Jeep, Toyota and Nissan automatics, Shift controllers and shifters, Toyota Triple Stick levers! My stuff: /forum/toyota-truck-4runner/996438-2rz-82-w-a340-duals-radesigns-way.html John 3:16- He is the answer.

01-25-2010, 09:15 PM	#4 (permalink)
JENSSEN Granite Guru Join Date: Aug 2004 Member # 34064 Location: Calgary, Alberta Posts: 716	I would start by checking the 10 amp fuse onset the dash on the passengersude close to the tranny ECM __________________ www.racingforthecure.ca CTV NEWS My Jeep hates me

01-26-2010, 10:43 AM	#5 (permalink)
Xj in Va Registered User Join Date: Nov 2001 Member # 8042 Location: Virginia Beach, VA Posts: 71	the fuse closest to the TCM is not blown. I have another TCM that is in my XJ not being used. I am going to switch that now and see if anything changes. I will update later. Thanks again. Joe __________________ 1989 XJ - 350-th350-205, d60-14b

01-26-2010, 08:33 PM	#7 (permalink)
Xj in Va Registered User Join Date: Nov 2001 Member # 8042 Location: Virginia Beach, VA Posts: 71	Ok after all that it was the damn TCU the whole time. That sucks, a whole lot of work for a 5 minute repair. Oh well, now it has a rebuilt trans in it before I sell it. Anyone interested in a comanche nice comanche? Anyone have a good set of 31? or some random 32x10.50tsl?? Thanks for help getting it fixed!! __________________ 1989 XJ - 350-th350-205, d60-14b

01-29-2010, 07:45 AM	#8 (permalink)
Phoenix Fire Registered User Join Date: Feb 2008 Member # 108954 Location: Downeast Maine Posts: 144	how much for the MJ? PM me and we can talk! I need to replace mine after rolling it a few times.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode