Who knows about FCCC "MMDC" and its issues?
Gents, I've searched and read many issues regarding the old "VDC" units and the newer MMDC units. I'm thinking I may have developed an MMDC issue. Here's the scenario. We're presently on vacation and...
Forum Discussion
Thanks for posting the cure. I think you're like a bulldog when you've got a problem to solve. I enjoy reading your posts.
Fred
Fred,
I chuckled on that one. "Bulldog" huh? That's funny. As I've stated many time before, I do almost all my own work for many reasons. Probably the same ones most of you do it for. One, to save money, two, to "hopefully" do the job correct, three, to learn more about my (our) rig, and four, if I post here about what I've done, (right or wrong), maybe some one can benefit from my trials and tribulations.
dougmac,
Yes Sir, the J1939 is quite a system. But, in all reality, it's actually very simple to me. It's two wires and two resistors. It simply transports info, to and from, all concerned parties that are attached to it. Even though I've only done one in my life time, to me, it's the same thing as a "Conference call". All parties get to speak, at the same time. They get to voice their opinions, ask questions and get results, all on two wires. Until two weeks ago, I had no idea it, the J1939, existed.
Since then, I've learned quite a bit about it and, there's also two more data links in that system. One is the 1587 and the other is the 339D. As I understand the principle operations of the 1587, it's simply a data link, a very slow speed one at that, around 96 BIT, between the Engine ECM and the Trans ECM. That's why the engine and transmission could "talk" with each other while the J1939 system was down.
As for the 339D system, as far as I can tell, it's a small data link that's intended for only two components. One, the MMDC and the other, the Information Center. That data link is what is used to display info on the information center. This stuff is cool.
Scott
Fred
Fred,
I chuckled on that one. "Bulldog" huh? That's funny. As I've stated many time before, I do almost all my own work for many reasons. Probably the same ones most of you do it for. One, to save money, two, to "hopefully" do the job correct, three, to learn more about my (our) rig, and four, if I post here about what I've done, (right or wrong), maybe some one can benefit from my trials and tribulations.
dougmac,
Yes Sir, the J1939 is quite a system. But, in all reality, it's actually very simple to me. It's two wires and two resistors. It simply transports info, to and from, all concerned parties that are attached to it. Even though I've only done one in my life time, to me, it's the same thing as a "Conference call". All parties get to speak, at the same time. They get to voice their opinions, ask questions and get results, all on two wires. Until two weeks ago, I had no idea it, the J1939, existed.
Since then, I've learned quite a bit about it and, there's also two more data links in that system. One is the 1587 and the other is the 339D. As I understand the principle operations of the 1587, it's simply a data link, a very slow speed one at that, around 96 BIT, between the Engine ECM and the Trans ECM. That's why the engine and transmission could "talk" with each other while the J1939 system was down.
As for the 339D system, as far as I can tell, it's a small data link that's intended for only two components. One, the MMDC and the other, the Information Center. That data link is what is used to display info on the information center. This stuff is cool.
Scott
