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Topic: A diagnostic problem -- where would you start??? (Read 2156 times) previous topic - next topic
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Re: A diagnostic problem -- where would you start???

Reply #25 –
Yahoo Message Number: 116096
Her here and a big amen. Let's not criticize we are all here to learn. Time for apologies all around. Kiss and make-up.

GARY Glenn
06 Magna 6622
With more troubles than a run over dog.

Re: A diagnostic problem -- where would you start???

Reply #26 –
Yahoo Message Number: 116097
I agree.

Tom
2007 Allure # 31570
'02 Silverado M&G Braking System

Tom
2007 Allure 430 Hood River Triple slide
#31570
'18 Silverado w/ M&G Braking system
 

Re: A diagnostic problem -- where would you start???

Reply #28 –
Yahoo Message Number: 116196
Well, after having the rig at Smith Power Products in Reno, the heavy-duty Allison transmission specialists here, for a full week, the verdict was that they could not find anything wrong with either the transmission or the wiring associated with it. They checked the resistance in every wire in the harness, found they all within normal limits, and ran the coach with both my own ECU and a test ECU installed, with no difference in the way it ran. The tech who knows these transmissions best did tell me that, in other cases similar to this, he had replaced the 4 positive and ground wires to the VIM and ECU (they call this the TCM -- transmission control module) and that solved the problem. Consequently, I had him do this. I'm not 100% sure it was necessary, but it gives me a little peace of mind before embarking on another trip -- at least I know what ISN'T wrong with it, and I know I can drive the coach, even if the fault occurs again, without damaging the transmission. Unfortunately, I'll never know the answer to these questions:

1) Did the things I did before taking it to Allison solve the problem?
2) Was there anything wrong with the four wires the tech replaced, even though they Ohmed out OK?
3) Was there ever a real problem, or was it just a computer glitch that disappeared when I cleared the code?

I'm not completely confident that the problem (if there really was one) is solved, but I've done everything I can. Hopefully, some short "test trips" will restore my confidence in this machine. It has served us faithfully for many years, and I'd like to think it will do so for many more.

DRJ
2003 Magna Resort #6240