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Old 03-31-2018, 10:54 PM   #15
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If and that's a big "if", things are back to normal, I can't help but wonder why in the world the Transmission has worked up to this point without isolation and that chassis ground connected. In the Allison Bulletin it blurts out something about transient voltage traveling through the chassis ground and that is why it should be isolated. This is all Great but has age caused this condition to occur 22 years later?

I guess in the scheme of things, if it works-don't fix it! :-)
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Old 04-05-2018, 02:24 AM   #16
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The latest and greatest to follow.
So after thinking I had the problem fixed, I went back to my trouble shooting and making more phone calls. From a previous poster, I knew that at least one place in my neck of the woods had little to no understanding of "all" that is an Allison Transmission.

With that being said, I did speak with someone up here in Ventura County who immediately suggested a Allison Authorized location down in Corona(Western State Converters and Transmission. Off I went on my two hour ride to finally get my ECU bench tested. Low and behold, after hooking it up to the test equipment, it actually did the same thing on the test equip as it does in the motor home....Morale of the story, I'll be sending the ECU to be rebuilt and I may go ahead and have the Touch Pad redone too while I'm at it.

For those who are wondering why you trouble shoot something like this for so long, think of the cost of Repair Stop trouble shooting at 200.00 an hour and getting an ECU rebuilt, that runs the gamut from 500-2500.00, I can't imagine what a service provider might tack on to that figure. That's where I'm at.....a rebuilt ECU!!!
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Old 05-10-2018, 03:38 PM   #17
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How about an update.
Did the ECU rebuild fix it?
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Old 05-13-2018, 10:17 AM   #18
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Update on Allison MH4000

Recently, there was a post, requesting an update on my original post. So here goes. Since the stop we made near Tucson, everything has gone extremely well, until about four weeks ago. We made it from Asheville, North Carolina to Maryland,. While setting up in the site we would be in for the next six months, I had a reoccurrence if the old problem. Transmission control pad froze up and I couldn’t start engine. Really bummed out. I called the Allison dealer in Baltimore to schedule a mobile mechanic. That appointment was two weeks away. A neighbor and I started checking out systems. He said that the “computer “ might need some rebooting. We cut off power to the transmission shift pad, by removing the fuse that Tucson mechanic had installed, reinserted fuse, and everything was fine. I bought a Big bottle of neighbors favorite adult beverage for him and breathed a sigh of relief.
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Old 01-03-2019, 09:33 PM   #19
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Sorry everyone, I thought I had updated my status on my Trans issues. Long story short, I did locate a ECU rebuilder in Texas(a very helpful gentleman, John) at Texas Transmission Specialists (if someone needs a number I can probably find it). The prices are what I would call excellent. I sent him my ECU/TCU and my Touch Pad to be rebuilt. About a week later I got everything back, plugged it all back in and have been Happy ever since.

To be sure, before sending the unit in to be rebuilt, I tried many different approaches to fix the issue including, running new power wires directly from batteries, I isolated the TCU as suggested by Allison, I cut wire #14 as instructed by Allison. I replaced fuses and some relays in the VIM and actually found a BUS Transportation Center that had a replacement VIM(used)in stock.

Refer back to my previous post on this thread to see where I took my TCU to have it tested on his computer set up. As I indicated, this Allison Dealer was able to replicate the issue and confirm I required a rebuild. What make it so Great, he did this for NO charge and No expectation of me having it rebuilt through him. I told him who and where I had received quotes for a rebuild and he wanted that information to pass on to others. His rebuild prices on the TCU was 2000.2500.00, John prices 495.00 plus another couple hundred to rebuild the touch pad. Question....??? I'll check my notes for actual business name and number to this rebuilder.
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Old 01-03-2019, 09:40 PM   #20
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OK here goes:
Transmission Instruments of Texas (transmissioninstruments.com)
(866) 439-9779 ask for John
He was very helpful in tips for troubleshooting and different procedures to try. I can't compliment him enough, fantastic to talk to and work with. His WEB site has troubleshooting procedures on it.
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