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Author Topic:   Optimax 200 check engine light
tesija posted 08-29-2004 12:59 PM ET (US)   Profile for tesija   Send Email to tesija  
I posted this on the repairs forum, but am interested in the experience of other Merc. Optimax owners. Mine is a 99 vintage 200 hp. with a new (2003) power head, which is mounteed on a 99 Conquest. Around 2000 to 3000 rpms, when accelerating and sometimes decelerating, the check engine light comes on briefly-no alarm. This usually happens under heavy load, or when the motor is cold. Otherwise it runs fine. I know this light serves about 5 or 6 functions, but the boat is in Europe, without easy access to a mechanic with a Merc. computer, at least one that seems trustworthy.If you've had similar problems with your Optimaxes, what were the diagnosed causes and ultimate fixes. Appreciate your imput.
handn posted 08-30-2004 01:37 PM ET (US)     Profile for handn  Send Email to handn     
Get an owner's manual from Mercury. The manual will tell you what the various flashes and horn sounds mean.
tesija posted 08-30-2004 09:02 PM ET (US)     Profile for tesija  Send Email to tesija     
I know that there are various faults reperesented by that light, but since I'm Stateside and the boat is in Europe, where it can't be easily diagnosed, I'm wondering what faults others have experienced with their Optimaxes that showed the same warning.
handn posted 09-02-2004 09:17 AM ET (US)     Profile for handn  Send Email to handn     
Maybe some kind Optimax owner will quote from the owners' manual what a flashing check engine light with no horn means.
I would do so except my manual is with the boat in Mexico.
Whalerider posted 09-02-2004 10:27 AM ET (US)     Profile for Whalerider  Send Email to Whalerider     
Check my manual and there is NO condition that the "check engine" light will come on WITHOUT the warning horn. I will add that my manual only covers back to 2001. I suspect its a false warning...have a dealer check it out.


bsmotril posted 09-02-2004 03:33 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Check engine alone is a sensor failure. If it happens during throttle up, or throttle down, it is likley that the redundant Throttle position sensors momentarily disagree with each other. They are basically potentiometers on the ends of the throttle butterfly shaft and can develop intermittend connection internally in the humid environment under the cowl. BillS
tesija posted 09-02-2004 07:13 PM ET (US)     Profile for tesija  Send Email to tesija     
Well I have a copy of the manual which lists no less than 5 events where check engine light comes on without the horn 1)battery voltage, 2) warning horn 3) injector 4) ignition coil 5) sensor. See pg. 29. The boat is far from any Merc. dealer (at least one with a diagnostic computer), so I may have to rmove the CPU unit and send it here to the States to see if it can be diagnosed. I was hoping to hear from other Optimax owners, to see if there seems to be a particular problem that is endemic to 200hp Optimaxes, that may help me narrow down the likely culprit. John
bocaspiff posted 09-02-2004 09:05 PM ET (US)     Profile for bocaspiff  Send Email to bocaspiff     
The check engine light could have something to do with water in the fuel. We see it all the time on the Optimax 225's.
bsmotril posted 09-03-2004 10:50 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
There is a separate dedicated indicator light for "water in fuel". Low battery voltage will cause it to come on under 1000 rpm unless the problem is a loose battery cable, then it might come on at any time, usually when jolting coming off a wave. From the description given, I still vote for the TPS.
tesija posted 09-03-2004 05:48 PM ET (US)     Profile for tesija  Send Email to tesija     
Thanx guys for your input. If anyone else has any ideas, I'd love to hear from you. John
Whalerider posted 09-04-2004 12:03 AM ET (US)     Profile for Whalerider  Send Email to Whalerider     
hummmm..things have changed with the newer versions, I guess. I dont even have a page 29. On mine there is not a condition that alloows the light without the horn...sorry I couldn"t help. I would just call any good merc shop and ask them.
tesija posted 09-06-2004 08:45 AM ET (US)     Profile for tesija  Send Email to tesija     
I'm thinking the batteries, or battery cables may be an issue, because the fishfinder was acting up also and it's voltage sensitive, according to its owner's manual. However all instruments showed plenty of juice at idle and under power, including the fishfinder. The boat was shaken up pretty good on its trip from US to Erope, (combination ship/truck transport) because I found all kinds of loose screws and even one of the auxilary pumps came loose in the billage. Perhaps one of the main power cables also got beat up along the way. Any thoughts on the affects on the motor?

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