Freightliner Can't Fix My problem

The way its behaving, with the gauges going dead like that, I'd almost wager a guess that your ECM is losing ign power, constant power or a ground.

 

I'd check ALL the ground points batteries/chassis/engine. Stealerships are pretty much worthless for troubleshooting. I only use them when I know whats wrong and don't have the facilities to perform the repair.

 

Stealerships. Never heard that term before. I need to add it to my vocabulary!

 

Pittsburgh power could probably fix what ever it is. They work on the new emissions truck and even have better programs for ECM. They don't delete emissions they keep truck legal. It might be worth calling them.

http://www.pittsburghpower.com

 

A friend of mine is a mechanic for DD and I remember him talking about a road call he had a year or so ago and it sounds pretty similar to the symptoms your having now, anyway it came down to coolant leaking from a sensor into the plug and into the wire harness to the other end and it eventually made it's way to another component or ECM can't remember now, but there was no visible leak, just happened to stumble on corrosion at that component

 

I had a 2006 Century, lost complete engine electricity while going down the road. In mine it was the engine master relay. In the fuse compartment there are two 70 amp relays, one marked accessory, the other marked ignition I believe or main.
They are identical relays, so to test you could just swap them and see how it goes.
Don't know if it is your problem, but free to try.

 

Did they replace the smaller of the 2 harnesses that consist of the "engine harness"? The smaller wraps around back of engine. It is only around $50, but it is a PITA to change. Better off leaving old one in. I change more of these on a DDEC VI than the larger harness.

 

If they spliced the wire or any wire that has to do with the ecm, Freightliner has a specific procedure and parts to use that seal the wire the right way. I had an issue with one of the voltage feeds going into the emc being frayed because the factory didn't put a tiewrap on, so it had to be cut, cleaned and spliced. The first dealer did it, it worked for 8 months until water got into the splice and then we had all kinds of errors, the driver said it would just spit out codes like it was dying. SO off to another dealer and they replaced the harness because it was compromised. They said the other dealer did the splice wrong and he gave my driver a few printed pages to send to me about how to splice it right.

 

I did notice that after you hit some big bumps, That the problem started. And, why is the fan cycling. What was the oil pressure gauge doing when this happens?