Originally Posted by Wroughtnharv
I believe the plug is under the dash. With the ignition on there is a trouble shooting program on the trans control. I don’t recall the exact sequence but it involves pushing two buttons as the same time, numbers will appear, and those numbers can be crosschecked with a code explainer to see what’s going on.
Ours is a 93 with the same motor trans. I had a service alert and it turned out to be a common down shifting issue that Allison no longer supports. Trash trucks use the same trans and our mechanic said it is something recommends learning to live with.
Is there any chance the starting issue is a fuel delivery issue?
He is trying to locate the transmission control module, to test the pinouts for power and ground issues. If that all checks out good then he will send out the TCM for a rebuild, but first he has to find where Winnebago hid the TCM. The pinouts testing sequence is available online.
He is a days drive away so I'm trying to help long distance. It is not fuel related, it's definitely a trans control issue.
I just went through this on my coach and ended up having to replace the TCM.