Starting Problem

This topic contains 6 replies and was last updated by davis-massey 10 years 7 months ago
September 30th, 2010 5:44am
After a weekend outing and parking my Class A Motor Home I went out two weeks later and it wouldn't do anything when I turned the key on to start. The dash lights would lite up but the Automatic Shifter indacator lights that tells you the Unit is in Netural did not light up . Checked all fuses and batteries but all were good . My question for someone is if the lights on the shifter do not light up showing it's in nuteral will this keep the Unit from even trying to start . ? If the ECU unit on the transmission has gone out will this pervent starting the diesel motor ?
September 30th, 2010 1:50pm
I doubt it's the ECU, but if for some reason it dosn't know you're in "N" it won't start. Some systems can get hoplessly confused if they are shut off in gear. Any chance that happened? Do you know what trans you've got?
September 30th, 2010 5:09pm
hey dont know much about motor homes but our equipment has elctronic shifters , did you try holding the key to start and moving the shifter to see if the micro switch needs and adjustment hold key to start and wiggle the shifter in and out of gear to see if you can find the sweet spot just a geuss good luck
October 5th, 2010 2:20am
no it won't start if the trans shifter isn't lit up. it doesn't send the neutral signal so it won't start. is the trans ecu plugged in and power and ground to it good? ther may be a trans ignation relay that isn't working also.
October 5th, 2010 9:30pm
Thanks for the reply. I pulled the ECU Module and had it checked, it wouldn't boot up on the Computer so they say it's bad . I don't know what happen to make it go out, I had it out for a weekend and when I got home and killed it went back out a few weeks later and it wouldn't start . I don't remember seeing and alarms on my dash or the shifter before I killed it so I really don't know what happen . I checked all the batteries and the Classis batteries showed to be OK and charge up ok, but the house batteries I think went bad because after I removed them and put a charger on them they wouldn't charge, it we like they had gone to ground and would peg out the Charge meter ... I have installed new House batteries and now waiting to get a New ECU Module, hope this takes care of it ...
October 6th, 2010 6:18am
Static electricity is a killer; a killer of electronics.

Lightening is a form of static electricity. Its voltage has been estimated or extrapolated to about three million volts per meter, or about one million volts per foot. Someone wearing wool socks on a nylon carpet can create a static spark a half inch long in dry air. That half inch spark would mean about 40,000 volts.

They say that an ECM can be destroyed by 800 volt static spark. That could extrapolate to a spark barely detectable from a finger.

It is entirely possible that you inadvertently destroyed your ECM when you touched your key.
October 7th, 2010 4:26am
If you have a 2000 series or 3000 series Allison the trans has a direct feed positive and negative to the ECU straight from the batteries. This will cause the indicator lights to not show up. It's strange why such an intricate piece of electronics (on a pusher bus) is hard wired direct from the source.

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