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maxx62
Senior Member

United States
106 Posts

Posted - 09/03/2013 :  4:53:15 PM  Show Profile  Reply with Quote
Hello, I am having problems with a 2013 vision, as soon as you start it,it is showing that you are going 25 mph and after a few seconds idling it rev upto 2600 rpms and 100mph for a couple seconds and idle will go back to normal but speed stops at 25 again. If you barely tap the gas pedal it will do it again. I you put it in gear speed drops back to zero but put it back in neutral revs up shows 100 and puts on mileage as if it were moving. I have cleaned all the ground connections as I find them,disconnected alternator, unplug rear speed sensor it wont do it. Any other ideas about this crazy bus.

ITGuy211
New Member

2 Posts

Posted - 09/03/2013 :  6:02:04 PM  Show Profile  Visit ITGuy211's Homepage  Reply with Quote
does it show any codes? did you run it with the comp?
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maxx62
Senior Member

United States
106 Posts

Posted - 09/03/2013 :  6:48:15 PM  Show Profile  Reply with Quote
still working on getting comp software. but only onboard diagnostics is abs because it reading mph and miles but bus is not moving.
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oldmech
Active Member

United States
21 Posts

Posted - 09/04/2013 :  04:22:17 AM  Show Profile  Reply with Quote
Check for water in the TCM plug. I had one get water in it after a hard rain and mine wouldn't go into gear either. Ended up with a new TCM. Good luck
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maxx62
Senior Member

United States
106 Posts

Posted - 09/04/2013 :  09:59:29 AM  Show Profile  Reply with Quote
The bus still goes into gear and drives. When you do shift into forward or reverse it shifts hard. When you go from forward or reverse to neutral it will do the rev up and speedo goes to 100mph.
Have been checking all connectors i can to look for problems.

Edited by - maxx62 on 09/04/2013 10:00:44 AM
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maxx62
Senior Member

United States
106 Posts

Posted - 09/09/2013 :  4:48:30 PM  Show Profile  Reply with Quote
I hooked upto the Allison doc program and when looking at the trans input speed and turbine speed they look normal about 780 but the output is showing 1150 when it should be at 0. Does this sound like a computer failure. when you barely press on the excelerator pedal and the engine revs way up the output speed on the computer goes up over 4000rpms and the speedo shows 100mph but the bus is still parked with the brakes on in neutral.

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Bus Tech II
Senior Member

94 Posts

Posted - 09/10/2013 :  05:26:55 AM  Show Profile  Visit Bus Tech II's Homepage  Reply with Quote
Looks like you have an issue with the output speed sensor ckt. What series allison do you have?
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maxx62
Senior Member

United States
106 Posts

Posted - 09/10/2013 :  10:03:05 AM  Show Profile  Reply with Quote
it is a 2500.
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partsman_ba
Administrator

United States
283 Posts

Posted - 09/10/2013 :  3:50:47 PM  Show Profile  Reply with Quote
It should still be under warranty for whatever the problem is, correct?
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