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Old 06-27-2009, 09:34 AM   #1
Georgia Flash's Avatar
Join Date: Jun 2007
Location: Waco, Texas
Posts: 96
Thumbs up Diagnostics on 1999 Bus

Well, I have finally had a problem with the old Bus. I have a "check engine" light. After some digging and attemps to discover what the problem is that was causing the light I disconnected the battery and reset the sensor.
During my search for answers I found a switch under the dash that is labeled "Diagnostics".
Does anyone know what it does?
Does anyone know how to use it?
Will you share with me the information so I will not go nuts trying to figure it out?

Bill, Loretta & Beebe w/Miss Thing the cat.
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Old 06-27-2009, 10:18 AM   #2
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wagon217's Avatar
Join Date: Jul 2008
Location: Lake Mary, Fl.
Posts: 161
My recommendation would be to give Red Bay a call and ask one of the service advisors there. They at least may be able to tell you if it's for the engine or the chassis.

Good Luck

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Old 08-03-2009, 03:43 PM   #3
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Tiffin Owners Club
Join Date: Jun 2005
Location: Alabama
Posts: 27
Is the plug mounted on the panel to the left of the steering wheel, if so is it square or round.
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Old 08-06-2009, 07:50 PM   #4
Georgia Flash's Avatar
Join Date: Jun 2007
Location: Waco, Texas
Posts: 96
Well, back at it. I have found out a little about the switch under the dash. When you have a service engine fault you can push this switch and it will cause the check engine light blink. It will blink a series of times. This coincides with the fault code of the Cummins. I haven't tried it so I am not the expert here. If I ever have another fault I will check it out and let you know.
Bill, Loretta & Beebe w/Miss Thing the cat.
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