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jwurl

03-11-2010 07:59 PM

MEFI 3 Can not read codes. Help!

I have just built a new 540 EFI and I can not get a Mercruiser/Rinda scan tool to read codes on my mefi3 ecm. I know how the tool works, and have used it many times on different boats. Any suggestions on how to get this thing to read my ecm?? Thanks, Jeff Wurl

FIRST AFENCE

03-11-2010 08:16 PM

Quote:

Originally Posted by jwurl (Post 3065489)

Hit it on the side of the boat three times and try it again. :lolhit:

jwurl

03-13-2010 09:47 AM

Anyone?????

racinfever

03-14-2010 01:06 PM

Your ECM may be a replacement mefi 4 , scan tool will not read it.

jwurl

03-14-2010 03:23 PM

ECM is the original with GM delphi mefi3 part number 16236999. Thanks anyways, Jeff

cooter01

03-14-2010 09:31 PM

I have a 2001 hp 500. I think it is mefi 3
in the repair manual it states ecm units number 840136-1 and below will not have trouble code readability
840136-2 and up will
hope this helps

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