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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: c-coop on July 25, 2008, 04:40:27 PM

Title: b-500 problems
Post by: c-coop on July 25, 2008, 04:40:27 PM
 just installed rebuilt b-500 into my mc9 I am getting various trouble codes which  are linked to the retarder[it is not equipped with one] the local allison service centers have no clue. looking for someone who might could help.
Title: Re: b-500 problems
Post by: luvrbus on July 25, 2008, 05:05:10 PM
c coop have you checked the information garge on United's web  www.utxchange.com
Title: Re: b-500 problems
Post by: blue_goose on July 25, 2008, 05:17:39 PM
Not enough info to help now.  Have you looked at the trans. with a prolink?  What codes are you getting?  What is it not doing?
Jack
Title: Re: b-500 problems
Post by: c-coop on July 25, 2008, 05:33:54 PM
getting codes 6212-retarder temp sensor failed, 6412-retarder modulation request sensor failed, 4523-open circuit h solenoid, 6611-sci engine coolant source fault. these all relate to the retarder, which I do not have. I have checked and rechecked the wiring- which I installed as per the wiring diagrams and cannot find any problems here. spoke to 3 different allison dealers in my area but no help
Title: Re: b-500 problems
Post by: Dallas on July 25, 2008, 05:36:06 PM
Sounds like the WTEC is programmed for a transmission with retarder.

When it can't find the retarder, the codes will really fly!
Title: Re: b-500 problems
Post by: blue_goose on July 26, 2008, 09:06:12 AM
Dallas is right on.  You need to pull your ecu and have it reprogramed.  They need to put in a Motorhome program with no redarder. 
You could talk to Gene at Reliable Transmission Service he can fix you up.  They are in Riverview FL and there number is 1-800-344-0485.  They can reprogram your ecu or just cut off the parts that you don't need.
Jack
Title: Re: b-500 problems
Post by: c-coop on July 26, 2008, 10:36:55 AM
these ecms automatically sense which options are in place retarder etc. they are not programed as such. it is called the autodetect feature
Title: Re: b-500 problems
Post by: Marcus on July 26, 2008, 02:08:48 PM
C-coop, How will the b-500 affect your rpms at 70 mph. It should give you better fuel milage. How expensive is the swap/ Marc
Title: Re: b-500 problems
Post by: Sammy on July 26, 2008, 03:57:51 PM
You can reprogram the ECU with a ProLink , if it has not been started 24 times.
What type of WTEC ECU do you have - WTEC 2 or WTEC 3??
Title: Re: b-500 problems
Post by: blue_goose on July 26, 2008, 04:27:12 PM
getting codes 6212-retarder temp sensor failed, 6412-retarder modulation request sensor failed, 4523-open circuit h solenoid, 6611-sci engine coolant source fault. these all relate to the retarder, which I do not have. I have checked and rechecked the wiring- which I installed as per the wiring diagrams and cannot find any problems here. spoke to 3 different Allison dealers in my area but no help



You said that you needed help.  I know what makes a B500 work the two that I installed work great.  The name I gave you and free number is one of the best in the country.  If you don't want to talk to him I will give you one more.  Ted Keating  1800-997-4tkt  these two people have more info on the world transmission than most all of us put together. 
Jack

You said the transmission was a rebuilt unit, you didn't say where the ecu came from.  The first world that I put in was a rebuilt unit, without a retarder.  The ecu that I used came off a b500 with a retarder.  I had to have the ecu re programed before it would work.  If the ecu has worked with a retarder and programed for one it won't autodect that it is gone.  Ted may be the first person to talk with, he has a better understanding of us busnuts that make this type of change.  He can also reprogram the ecu.

Lots of luck
Jack
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