Community Forums

Melorene · 09-05-2012, 07:14 AM

Here is what is happening and what I have done...
Turn ign. key on and transmission error lights up..intrum. panel lights up ok but gauges swing back and forth..
No lights on the engine Vansco unit..

I have checked:

Batteries, pulled 12 ones and had uncle Les S. check them.. ok
house batteries ok
even replaced the rear solenoid transfer switch as I have a spare
checked fuses on rear battery panel
now:
is there a fuse or way to check power into rear engine vansco..
when I turn the chassis switch I hear the solenoid operate ..

engine will not try to try to start or turn over.

all worked fine the day before as it is parked in my yard..

next option is to have it towed up to the Allison service center aka inland truck parts in missoula 50 miles away..hope one of our fantastic guru's on line have an idea before I have it towed. thanks in advance

EngineerMike · 09-06-2012, 10:49 AM

Mel- if there are no lights, no action at all, on the VMM- first check for power. On the right side of the VMM there are two connectors. One has 23 pins, the other 35. On the large connector, have the tech verify there are power connections to the following pins:
24, 25, 26: +Batt volts (+12.2-13.2V)
27: Ground
Without these signals at proper levels, i.e. good voltage & good ground (I think) the VMM is dead. Here is a thread where bad (low but not zero) voltage on pin26 left the front VMM "dead" or without LED's reporting activity. The wire to pin26 on my rear VMM is red, the others are white. The pin# positions are molded into the wire end clip on the connector for easy ID.

Renipladlo · 09-11-2012, 01:31 AM

Assuming Vansco is the culprit then Mike's advice is good. If that turns out not to work, then the ECM (Engine Control Modue) on the Cummins might have gone south. Now with that said, there is a 5 year/150K warranty on the engine, and I believe this module is part of that warranty, provided your coach is within that period. Howeve, Cummins wants happy customers, so go right to the top of the food chain of the facility you choose to deal with, the Manager of the whole place, and try to get them to give you a good deal on the replacement as they are in the 4-500 dollar range if my info is correct. Sounds like a lose wire someplace, check for those as well.

EngineerMike · 09-11-2012, 10:33 PM

Mel reported to me off line he had the VMM checked and it was bad, he ordered a new one, sent his other to the supplier to have its programming matched in the new one and the pair were to be air-freighted back to get him on the road.
Supplier was referred by norm.benes@parker.com who was apparently WRV's rep at Vansco which is now owned by Parker.