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ECM 555 Locked?

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Old 06-12-2019, 02:48 PM
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Default ECM 555 Locked?

I have 2003 dual Mercruiser 350 mpi withe ecm 555 controllers.i was having trouble with the starboard engine.had a mechanic check it and he said that the controller is locked and he cannot get in.The port was fine.So I purchase a vesselview mobile.I can communicate withe the port controller but the starboard controller says”error reset key”.
can some help out?Can a controller be locked?
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Old 06-13-2019, 09:43 PM
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it has no communication - it is not locked - you have either a plug / DLC issue or an internal issue of the ecm. Very easy to test to see if the issue is with the DLC so one can rule it out
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Old 06-16-2019, 10:32 AM
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Hi BUP
Could you let me know how to test the ecm problem or would you rather that I phone you.Thank for helping me out.
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Old 06-16-2019, 11:49 AM
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swap ecm's engine to engine should give idea if dlc/engine harness is ok.
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Old 06-16-2019, 03:16 PM
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Thanks, I will try that,also I will check that I have 12 volts on the outside pins of the dlc.
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Old 06-16-2019, 04:32 PM
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Do not ever swap a good known ECM to a bad engine EVER - that is one possible way to knock out a good ecm possible making it 2 bad ecm s one has. AND THIS INFO coming form a guy who repairs ECM about an average 2 per week inwhich takes money out my hands. I bet you would never hear a competitor post such important info to help one out.

A scan tool is another way to test the ecm and of course what I am doing internal testing with a power supply, a scope, volt meter and scan tool along with sensors and injectors ,.

Last edited by BUP; 06-16-2019 at 04:37 PM.
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Old 06-16-2019, 08:51 PM
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Thanks for this information BUP.I read where there is a yellow wire between engines that this could cause issues,as one is a master and the other a slave ecm.I want to check to make sure the cable is okay and the voltage is 12 volts.Then I will know for sure is is the ecm.
thanks alot
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