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Author Topic:   2004 Mercury 115 EFI FOURSTROKE Electronic Diagnosis
c maas posted 09-28-2010 09:27 PM ET (US)   Profile for c maas   Send Email to c maas  
The manual tells me I can self diagnose [a 2004 Mercury 115 EFI FOURSTROKE] engine with a test light to access the fault codes. The manual shows the two-wire test light plugging into two wires that supposedly live in the vicinity of the fuse holders. I can find one plug BLUE-WHITE but not the other BLACK-RED, even with my glasses on.

Was there a change in the set up at some point that isn't shown in the manual?

I am trying to diagnose why my engine has started to "make oil" after 750 hours. I've found some really helpful information on this forum. It looks like a likely suspect is the fuel pump, but I want to check out the sensors as well while I'm messing with it.


jimh posted 09-29-2010 09:32 PM ET (US)     Profile for jimh  Send Email to jimh     
I believe that in that era, c.2004, your Mercury four-cycle motor is really a Yamaha outboard motor with a Mercury paint job. You might investigate the corresponding Yamaha service manual to see if it gives more information on the technique for accessing stored data in the engine control module.
bloller posted 09-30-2010 04:32 PM ET (US)     Profile for bloller  Send Email to bloller     
There always seems to be confusion when discussing the early Mercury Fourstroke engines. I don't believe it is correct to state that the entire engine minus the paint job is a Yamaha.

For example the 60hp Yamaha four cycle of circa 2004 was carburated while the 60hp Mercury four cycle of 2004 was EFI.

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