Who knows about FCCC "MMDC" and its issues?

FIRE UP wrote:
Dougmac,
Well Sir, let me put it to you this way. While the tech was looking and looking for the two resistors, AM I'M PAYING FOR HIS TIME, I thought I'd do something that makes sense, CALL FREIGHTLINER CUSTOMER SERVICE!!!! So, I called, told them my vin, and my issues and they told me right where the two resistors are. The first, as stated, is just down a few inches from the rear diagnostic port.

And the man on the phone also told me that the other one was "In the MMDC". I confirmed what he said and, he said yep, it's inside the MMDC.

That phone call took all of two and a half minutes. Well, I jumped out of the car and ran (fast walk) over to the tech. I told him what I found out. He said he'd found the one at the rear but was not aware of the other one being "inside" the MMDC. So, he ran some sort of checks and said that yep, it's not answering his probe tests the way it should so, they ordered up, a new MMDC from Memphis. It was air freighted in and, the installed it at about 3:00 today.

Well, guess what, that did not cure my issues. And, talking with some of the other techs there at the Freightliner Service Center, and they said that they've NEVER HEARD OF THE END RESISTOR BEING inside the MMDC.

So, now I'm stuck. I told the service center that since the new MMDC did not work, I was not going to pay for it, and, they wanted me to stay one more night in this rat hole of El Paso and I made the decision right then and said "nope" "Wrap it up" I'm leaving with it still malfunctioning.

That Freightliner Service Center "On the Border Freightliner" is by far, the worst operating repair center I've ever had to deal with. While there, the wife and I talked with other RV owners and, several over the road truck drivers and they all agreed, it's one of the worst Freightliner Service Centers in the U.S. Absolute horrible people skills/communication skills, phenomenally slow in every phase of an encounter with a customer, from the start, through the analyzation process, repair process and realllllllllly slow in wrapping up all the paper work.

What a nightmare. We will never, ever go anywhere near that town again.

Anyway, so, after that much rambling, I'm here, at a much nicer camp ground, in Las Cruses NM and, it's quieter, cleaner, and way more civilized. But, I'm still broke. No speedo, no tach, no water, oil, volt and turbo boost gauges. No cruise control and or exhaust brake. The coach is operating just fine. I will do some attempting to check connections etc. while we're out traveling. So, we'll see. Thanks again.
Scott

From my experience,your problem doesn't sound like a problem with the resistors. Generally the network will operate with one of the resistors unplugged.
Obviously the network is able to function because your transmission and engine seem to be communicating fine. From what I am gathering it seems like the MMDC is the only device that is having trouble communicating. I would be looking at the leg of the network that goes to the MMDC.

BTW... I may have been right there with them digging around for that resistor. I would have never thought of them placing it inside of another component.