Battlefield Flag Co
New member
- 10
- 9
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- Location
- Illinois. Near St. Louis, MO.
Hello,
I got my 1991 M-1079R1 with 2000 miles on it a few months back. Changed fluids, new batteries, tire maintenance and things going great.
Went out a couple weeks ago, thing won't back up when put in R. In park it is fighting itself against going forward, in reverse the same things, in neutral it goes forward slowly. I can put it in neutral with engine off and it rolls like it is in neutral, so that makes believe linkage is fine.
Electrical issues.? Seems like it too.
Looks like possibly two problems, while possible, it's strange and before I take the plunge on a big bill at the shop I am asking for your analysis and input please.
Thanks,
Jeffrey
I got my 1991 M-1079R1 with 2000 miles on it a few months back. Changed fluids, new batteries, tire maintenance and things going great.
Went out a couple weeks ago, thing won't back up when put in R. In park it is fighting itself against going forward, in reverse the same things, in neutral it goes forward slowly. I can put it in neutral with engine off and it rolls like it is in neutral, so that makes believe linkage is fine.
- Changed filter and fluid, no change. Everything looks great from bottom side of transmission valve body.
- Trans light on all the time.
- Went through the 4L80E troubleshooting book.
- Jumped pins A&E, no codes will flash, light remains steady.
- Disconnected J1 and light goes out, indicating MIL not shorted. Checked wiring anyway, all looks good.
- Followed procedures for Chart A-2 MIL on steady.
- Both results say to replace the TCM (more to follow before I just replace that I think)
- NOTE: Pulled cover off of the TCM box today, TCM is warm and the truck hasn't been running for 24 hours. (possibly relay stuck closed charging TCM all the time?)
- With all wiring disconnected from transmission and TCM it still behaves same, not going backwards when in reverse, etc.
Electrical issues.? Seems like it too.
Looks like possibly two problems, while possible, it's strange and before I take the plunge on a big bill at the shop I am asking for your analysis and input please.
Thanks,
Jeffrey
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