Bus wont start

joedelauter · November 09, 2018, 01:53:43 PM

Having a challenge with our 99 MCI 6V92 A103.
Last couple of weeks seem to having something going wrong with the neutral safety - getting it set so bus will start. Today finally could not get it to start at all.
Is this neutral thing a component - switch or connector? Where is it located? Can it be replaced or fixed? Where can we get the part?
Also need help finding the diagnostic port to plug in to run diagnostics. Cant find anything in engine compartment. Called MCI tech support. They said it should be under dash to left of steering wheel. cant find anything there either. Does anyone know where this connector port is?
Appreciate any and all help
Thank you
Joe

Dave5Cs · November 09, 2018, 02:36:30 PM

Probably a 102A
Yours may be different than my 5C. Should also be a neutral relay in same box. Look in your maintenance manual about chapter 7 IIRC.
What part of the country are you in? Might be a Busnut close to you.

luvrbus · November 09, 2018, 02:48:05 PM

There is a port in the front bay driver side where the AC relay are just open the door on the tunnel,? what transmission electronic transmission don't use a neutral switch on the transmission it is in the pad or shift tower

joedelauter · November 11, 2018, 10:12:35 AM

thank you guys!!

I am in Central PA

joedelauter · November 11, 2018, 10:13:31 AM

Yes, you are correct, it is a 102
either a fat finger entry mistake or brain malfunction on that

joedelauter · November 11, 2018, 10:16:22 AM

when you say in the pad. Not sure i know what you mean by that.
Understand the shift tower is the box where the shift lever is located.
Just had the gear indicator stop moving when we shift. Is that a problem?

luvrbus · November 11, 2018, 11:23:26 AM

Is the transmission and engine electronic control ? they can have a shift tower or a push button pad for selecting gears on a electronic control transmission help us out man

,I don't think you have a 1999 model 102A maybe a 1989

Templar52 · November 11, 2018, 12:32:58 PM

Neutral switch can be in the side of the transmission if it is an automatic

luvrbus · November 11, 2018, 02:33:53 PM

Quote from: Templar52 on November 11, 2018, 12:32:58 PM
Neutral switch can be in the side of the transmission if it is an automatic

If he has a Allison World Transmission where does the neutral switch mount ? on the side ,a 1999 model should have a World Transmission or another brand of electronic transmission if a automatic

joedelauter · November 11, 2018, 05:03:46 PM

Thanks again for the help.
Still may need more help with this. To follow up. The system is DDEC 6V92, with automatic transmission. Shift lever is to right of driver seat in a tower type of mount. 5 speed.
What am i to look for on this neutral control switch? Is it a unit that we may need to replace, or something that can be repaired?
The manual i have on this seems to be incomplete. The bus is a 96-102 series finding lots of pages missing. The section for the transmission is chapter 13. But the pages i have are for a manual transmission. pages for the automatic are missing.
Just my luck

buswarrior · November 11, 2018, 05:32:26 PM

keep going...

What transmission model is in it?
The stickers on the shift tower doesn't tell us what's actually hanging under the bus back there.

Crawl in/under there with a rag, take a picture of the tag and post it here.

Can't help if we don't know what you got...

happy coaching!
buswarrior

luvrbus · November 11, 2018, 05:43:54 PM

You MCI guys help me out I am having trouble figuring out what bus he owns, the A went out of production in 1991 right,the C ran from 1988 till 1993,I believe this guy has a D or the MCI 12 a photo would be nice because a 1996 model will be a 4 stroke engine the 2 strokes left the market in 1994

Dave5Cs · November 11, 2018, 08:56:45 PM

95 to 99 was a 102 D and DL3
88 to 90 was 102A
88 to 93 was 102 C3
Was also a 102B in 85 but short lived.

jraynor · November 12, 2018, 03:35:20 AM

I have a copy of the Transmission section that you can look at depending on what model your bus is. But for anyone to fully help, we all need to know the complete model

Is it a 102A2, 102A3, 102B3, 102C3? Year as well

joedelauter · November 12, 2018, 04:41:00 AM

Thanks again for the help.
Still may need more help with this. To follow up. The system is DDEC 6V92, with automatic transmission. Shift lever is to right of driver seat in a tower type of mount. 5 speed.
What am i to look for on this neutral control switch? Is it a unit that we may need to replace, or something that can be repaired?
The manual i have on this seems to be incomplete. The bus is a 96-102 series finding lots of pages missing. The section for the transmission is chapter 13. But the pages i have are for a manual transmission. pages for the automatic are missing.
Just my luck

Quote from: jraynor on November 12, 2018, 03:35:20 AM
I have a copy of the Transmission section that you can look at depending on what model your bus is. But for anyone to fully help, we all need to know the complete model

Is it a 102A2, 102A3, 102B3, 102C3? Year as well