CDS and g3 are two different programs. G3 will not work on this engine. Also a bad iac will not throw a code. Hopefully the Rinda will help you. If you were closer dean I could take a look at it. Granted we still need to find time to do your lower unit testing. Unfortunately we have been very busy with repairing the race boat

Agreed with IAC and sometimes IAC will show a fault depending on the app but alot of the times will not.

Post # 4 I did Mention CDS not G3 and the rest of my posts about scan tools stated depends on what you have as far as apps - I was listing the current offering as well from Merc and explained dealer only. But that's not true either in some cases. I know many techs that have left the dealership completely and still go under that dealership for usage of G3.

For some reason CDI scan tool will show IAC sometimes where other scan tools won't especially with ECM 555. I have had this with diacom not showing an IAC fault but CDI scan tool did. Just an FYI for whomever

You have other scan tools on the market for marine apps that scan Mercruiser and Mercury among other marine engines just a jist list --- CDI and TEXA, also 2 M pro, - also API marine among a few others that many do not know about.,

obrien,
thanks for the update. Once I get this taken care of, I'll get with you and Steve and see when we can get together.
Thanks,
Dean