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BF150 NMEA Not Working

R

Ragnad

New member
First things first... This engine sunk 3 years ago. I had it out of the water, "pickled" and running again in under 4 hours. Other than having to replace the starter, and the NMEA problem, everything else is working great. And thanks to my new hero Wajira, on this forum, I was even able to conquer the intermittent but ever worsening overheating problem that pre-dated the sinking.

Is there any way for me to diagnose whether I'm getting a signal out of the engine at the NMEA connection without having to buy an expensive Honda computer?
 
NMEA goes direct to the ECU (two wires) and then has a ground and feed. Honda introduced NMEA around 2010. If your engine is NMEA capable, the next question is do you have other NMEA equipment and is it working to make sure your NMEA backbone, NMEA end terminal and NMEA is setup correctly. If all these are a yes, pull the ECU and check for corrosion on the board and connectors. Also measure for correct ground at engine NMEA connector and +12VDC. NMEA parameters also have to be correctly configured at the plotter.
 
BF150 NMEA capability starts from serial BANJ-1304171, check if your engine is pre or post. NMEA connector on engine is 6 pin but do not have schematic. In any case, suggestions remain as above, just try and follow the wires, check the grounds and check the ECU for pin or contact corrosion.
 
Thanks for the replies. It definitely had working NMEA prior to sinking. I found out that the 12v supply to the NMEA Bus comes from/through the ignition, and now that's my leading candidate. I had to rewire everything under the console after it sunk, and that was likely one of the many wires that "don't go to anything.". Now, it's a matter of figuring out which one it was. Plan "B" is to just jumper 12v to the NMEA adapter from 12v somewhere else. If there's one silver lining to the boat sinking, it's that I've learned a lot... like checking function of the bilge pump when you buy a boat and using adequately long dock lines for an unusually high tide.
 
lack of 12v to the backbone is the most common cause of loss os dignal. Might pay to replace the complete backbone too.
 
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