Yamaha's randomly turning off

sgwill122

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Feb 21, 2011
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Stephen
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'Lady Karen' 28 Duckworth Offshore
I have twin 2016 Yamaha 200's with fly by wire. In the last couple months the motors will randomly shut down. I have had it happen idling out of the marina but mostly while running on plane. It does not happen often, probably once every five trips. Luckily it has never happened in rough water so doubt it is a loose connection. It usually happens on both motors at the same time. I am able to start the motors right back up immediately and they run fine. I notice I lose power 1-2 seconds before the motors shut off. Could it be a faulty kill switch? Anybody run into something similar? It is tough to troubleshoot since it is so random.
 
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kenzmad

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Jan 18, 2011
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jamie
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Following this as I had my 2005 150 do this the other day. Running along and almost like I chopped the throttle. Fired back up and purrs like a kitten.
 
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Socket985

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Jun 6, 2008
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Mark
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21 ft ThunderJet OB/OS
I have twin 2016 Yamaha 200's with fly by wire. In the last couple months the motors will randomly shut down. I have had it happen idling out of the marina but mostly while running on plane. It does not happen often, probably once every five trips. Luckily it has never happened in rough water so doubt it is a loose connection. It usually happens on both motors at the same time. I am able to start the motors right back up immediately and they run fine. I notice I lose power 1-2 seconds before the motors shut off. Could it be a faulty kill switch? Anybody run into something similar? It is tough to troubleshoot since it is so random.


This sounds like a control module or connection issue if both engines stop at the same time. If it's a fly by wire system, this must mean an engine control module or multiple which determines when they run or not could be the issue, therefore the first step as mentioned is check all connections as it's easiest. I know on the aerial (bucket trucks) with fiber optic systems, anytime there was a control failure, it was usually the ecm/modules/voltage drop issue, therefore it was dropping the signal. I don't know much about the fly by wire Yamaha, however I suspect the method is similar.

If all the connections are good, it's probably going to take some specialized equipment, if it's even available to perform a test on these components, which simulate real world conditions in a shop setting.
 
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tacklejacked

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Jun 2, 2009
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Check connections but I would have a tech plug em in and see if they can pull any info from the computer.
 
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AKSalmon

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  • Jul 15, 2006
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    I had the same problem: It was a lose ground wire. Make sure it is snug and without any corrosion; some dielectric grease never hurts. When Couldn't find the problem I called Yamaha and was told this is a common issue.
     
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    sgwill122

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    Feb 21, 2011
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    'Lady Karen' 28 Duckworth Offshore
    I had the same problem: It was a lose ground wire. Make sure it is snug and without any corrosion; some dielectric grease never hurts. When Couldn't find the problem I called Yamaha and was told this is a common issue.

    Which ground wire was loose?
     
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    The Peddler

    Living vicariously through others.
    May 28, 2008
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    Following. This sounds like 2020 in-general, just when you get up to speed, something cuts
    out.
    :imdumb:

    Sorry to make light of your trouble. Hope you find the solution. I have a weird house bank gremlin to squash, myself.
    :_smack_:
     
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    sgwill122

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    Feb 21, 2011
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    'Lady Karen' 28 Duckworth Offshore
    My problem appears to be fixed, only time will tell but I have made 7 trips without a random shutdown. I originally assumed the controls at the helm had their own power feed separate from the engines but that was wrong, they are powered off of the engines battery connection. I pulled the ground lugs for both motors which looked clean and tight. I hit them with a wire brush anyway. I also pulled the positive leads and found both had bits of anti-corrosion spray on the face of the lugs. I cleaned them both up with a wire brush and tightened everything down. Fingers crossed this gremlin is gone.
     
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