Where do I look to find the TCM 2006 HR Vacationer DP?

[bwlowry615]

I have been having Allison MH1000 issues on my HR 2006 Vacationer DP. It gets stuck in either 3rd or 4th gear. I took it to the Allison Transmission shop and they found the wrong filter and low Tran fluid levels. That resolved the issues for a few weeks. (Could have just not happened during that time randomly.) The issue came back today. I checked Tran fluid level and it was full.

The Allison shop wants to find the TCM to tap directly into it and better diagnose the issue. They work on lots of trucks and buses, but not near as many RVs. As the Service Manager explained to me that RVs are some times creative where they mount the TCM. His words... "It is somewhere between the front bumper and the rear bumper." He doesn't want to charge me for looking for the unit. Especially since it could potentially take numerous hours just to find it.

My request is does anyone have an idea where the TCM on a 2006 HR Vacationer Diesel Pusher is located?

[Woodchopper]

Originally Posted by bwlowry615

I have been having Allison MH1000 issues on my HR 2006 Vacationer DP. It gets stuck in either 3rd or 4th gear. I took it to the Allison Transmission shop and they found the wrong filter and low Tran fluid levels. That resolved the issues for a few weeks. (Could have just not happened during that time randomly.) The issue came back today. I checked Tran fluid level and it was full.

The Allison shop wants to find the TCM to tap directly into it and better diagnose the issue. They work on lots of trucks and buses, but not near as many RVs. As the Service Manager explained to me that RVs are some times creative where they mount the TCM. His words... "It is somewhere between the front bumper and the rear bumper." He doesn't want to charge me for looking for the unit. Especially since it could potentially take numerous hours just to find it.

My request is does anyone have an idea where the TCM on a 2006 HR Vacationer Diesel Pusher is located?

bwlowry615
I don't know about the 2006 HR Vacationer Diesel Pusher, (or about a TCM)...but in my 1996 Safrari the Allison VIM, (Vehicle Interface Module), is located on the center of the front firewall.... below the windshield... up under the dash.

ALLISON VEHICLE INTERFACE MODULE (VIM)

[bwlowry615]

Called Holiday Rambler Tech Support in Oregon and got the answer.

The TCM and the ABS control modules are located in the back, passenger-side compartment. About 6-8 screws removed and the cover came off and there it was.

I am including pictures.

[dbarton291]

He probably isn't "tapping into" the TCM directly. He's looking for the diagnostic connector to hook up Allison DOC or another diagnostic tool of some kind. Those are usually under the dash or in a junction box somewhere.

[bwlowry615]

The tech was tapping directly into the TCM. This was done because there are communication issues with the front of the RV (where the plug-in port is under the left side of the dash.) He will follow the cable bundles up the rails and then clean and "re-Dielectric Grease" any connections that he comes across.

My bad luck was that when the fluid pan was dropped for inspection, there was a large amount of particles from the transmission. Awaiting a rebuilt Allison being shipped for replacement.

[dbarton291]

Ah okay. I see what you mean. I thought you meant he wanted to actually get inside the TCM. I misunderstood.