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Author Topic: Late model MCI will not shut off?  (Read 1217 times)
roadrunnertex
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« on: April 28, 2007, 06:16:18 PM »

Good friend is on a charter with a late model MCI with a electronic controled Cat engine.
When he tried to shut it off with the stop switch it just keep on running.
It's not a  "J" model.
Any good ideas on shutting it off?
jlv Huh
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Kristinsgrandpa
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1988 Neoplan AN 340, 6V-92 TA DDEC II, HT 748 ATEC




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« Reply #1 on: April 28, 2007, 06:23:46 PM »

  Mine is not a Cat and it's not an MCI but, the electronics on it are fed from a 12VDC breaker in the battery compartment.

I'd start looking in the engine comp or the battery compartment first.

Trip one breaker at a time.

Good luck.

Ed
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location: South central Ohio

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buswarrior
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« Reply #2 on: April 28, 2007, 07:28:16 PM »

Check the engine room switches that something isn't in "rear run"

happy coaching!
buswarrior
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Sammy
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« Reply #3 on: April 29, 2007, 03:56:07 AM »

Rear Run switch is definitely the first place to check. 
That coach probaly has multiplex wiring. Would have to locate the proper module to test.
Good luck.  Cool
« Last Edit: April 29, 2007, 03:58:19 AM by Sammy » Logged
mak
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« Reply #4 on: April 29, 2007, 07:04:10 AM »

I guess that's what scares me about the DDEC and other electronic engines, they do run great, but when  a problem developes... well, me being a mechincal guy and not tec guy... the bus would require a shop and not my tool box.
MAK
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Busted Knuckle
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« Reply #5 on: April 29, 2007, 07:23:37 AM »

Boy that's the first time I heard of an electronic CAT not shutting down! Back in the day, when I was trucking before electronics had found there way to diesels I had a pumped up 4 n a quarter Cat that'd pass anything but a fuel pump. One time I had the opposite problem it started dying as if I'd shut the key off, then after sitting 10-15 mins it'd start again then die when I'd hit a bad bump (I was in CHICAGO at the time)! Turns out the fuel shut off soleniod had gone bad. So I took the soleniod off (after dumping the clutch to kill it!) then I cut the rod on the soleniod off with hack saw & reinstalled it and it stayed running all the way home, so I could replace it! I wonder if you have a shut off soleniod not extending the rod to shut off the fuel? I know you said it's eletronically controlled, which I'm not sure how they go about it but something still has to control the fuel shut off! FWIW BK  Huh
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Busted Knuckle aka Bryce Gaston
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roadrunnertex
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« Reply #6 on: May 01, 2007, 10:33:27 AM »

Up date on problem. Tongue
Some one has added a unlabeled toggle switch next to the rear engine control switches for some unknown reason to prevent the engine from being shut off from the front or the rear of the coach.
Repositioned the switch and every thing now works normal. Grin
Thanks for the ideas.
jlv
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