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Old 05 March 2014, 15:11   #1
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Yammy F115 4-str engine management light question

Hi all,

I put the boat into the water today for the first time since november. I have a Yamaha F115 4-stroke on the back of it, and after checking the fuel was primed, oil levels, etc, started her up. The engine took a few turns before she fired, then sounded a bit "juddery" for 30 secs or so before settling down and sounding as good as usual as I did my final preps.

I set off and got half way to the entrance to the marina when the bar above the oil lamp symbol came on and the engine management light started to flash at me. I turned round straight away and went back in.

I re-checked the oil levels (all ok) and went to speak to the outboard engineers up in their workshop. They told me to check for the telltale, that the oil wasn't "milky" and there was plenty of oil in it - all fine. They said it is possibly a sensor somewhere and the engine had gone into "limp mode". I started her once again and the oil "bar" had disappeared but the flashing EM symbol remained. I shut her off after 30 secs or so and came home.

I have now done a complete oil change on my drive (as the EM checks for oil contamination as well as levels) and will take it back out again tomorrow to see if this makes any difference. Other than that, does anyone have any ideas where to look?

Oh yeah - I am an outboard novice mechanic!!
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Old 05 March 2014, 15:50   #2
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Count the number of flashes from the management symbol on the sequence as that's the fault code. Once you have that you can google it for an idea of the problem

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Old 05 March 2014, 15:52   #3
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Ah right. It flashed twice, went off then twice, off, twice, off.........

I'll have a look. Thanks.
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Old 05 March 2014, 16:08   #4
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Here's the codes

1 normal
13 pulser coil signal
15 engine temp sensor signal
18 throttle positional sensor signal
19 battery voltage
23 intake air temp sensor signal
28 neutral switch signal
29 intake air pressure sensor signal
37 Idle speed control
39 oil pressure
44 engine stop lanyard switch signal
45 shift cut out switch
46 thermoswitch signal

Twice, twice is code 22 I think that's the full list above so how sure are you on twice, twice as it doesn't show a 22 fault code.

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Old 05 March 2014, 16:20   #5
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Hmm, if that's the full list then I'm not 100% sure! I'll go have a play tomorrow (weather/wife dependant!) and see what happens now I've changed the oil. At least I should be able to look at the fault codes, now I know what I'm looking for. (Have also Googled, and found that holding the "Mode" button on the round Tacho gauge for 10s will show the actual code too).

Thanks for your help.
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Old 06 March 2014, 04:10   #6
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Yamaha diagnostics

Probably not practicle for you due to location etc. but if you need it, I have the Yamaha diagnostic software and interface cable on a laptop your welcome to borrow if it would help.

Let's hope it's a sensor fault and not something "real"
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Old 06 March 2014, 04:43   #7
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Quote:
Originally Posted by gordir999 View Post
Probably not practicle for you due to location etc. but if you need it, I have the Yamaha diagnostic software and interface cable on a laptop your welcome to borrow if it would help.

Let's hope it's a sensor fault and not something "real"
That's a kind offer.... i am just up the road from you and was wondering if i ever experience any problems you can extend the same kind facility to me?
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Old 06 March 2014, 05:41   #8
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We had very similar fault with our yam 115. turned out to be the ecu duff! Bhg marine at Lymington (good guys) tested for us by putting in a known good unit & water testing on the Solent. Confirmed that the ecu had gone!!
Depends on the year of your engine, I think if pre-2006 a Mercury ecu will fit & be half price! Still looking at around 700 though! Ahhhhhh!!!!
I really hope its something simple though?
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Old 06 March 2014, 05:57   #9
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Hi all, thanks for the offers and advice!

It would seem that the oil change has fixed it! I'm not able to get out today but I connected the water hose up to the flushing hose and started her up (checked with a Yammy mechanic who said this was fine for idling and very low revs over periods of less than 20 minutes or so). The engine light has gone off and there appeared to be no problems for the 4-5 minutes she was running in neutral/low revs in gear.

Fingers crossed she stays like that when I do get her in the water again.
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Old 06 March 2014, 06:03   #10
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Should you question why a oil change cured the problem?
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