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Old 11-30-2009, 11:06 PM
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Default Optimax warning horn

I have a 2004 150 HP Optimax. A very good engine except for the electonics. The engine always starts first up - hot or cold and runs smoothly with plenty of power. The problem is the warning horn is always sounding - 4 beeps every 2 mins and a constant beep at WOT. The 4 beeps sound at any rev range, including idle.
The oil system is working. Oil comes out of the under cowl tank when the cap is removed. It doesn't run hot and there is plenty of water from the telltail and water pressure line. There is no water in the filter. The water pump, fuel filter/water separator, under cowl oil tank/sensor, battery and spark plugs have been replaced but still the horn sounds. I have had a dealer check the engine with DDT and it shows no previous errors.
Has anyone any ideas.
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Old 12-01-2009, 04:45 AM
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4 beeps is the oil tank sensor alarm on the motor. You can check it with an ohm meter. Or just unplug and see if the alarm goes away. constant horn will be some thing different.
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Old 12-01-2009, 07:12 PM
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Are you over revving the engine? My 04 Opti will sound the horn if i'm wide open and fully trimmed. The SmartCraft gauge will say over rev when the max RPM is reached, if I back off just a little it goes off. Is your oil tank full, could the 4 beeps be a low oil warning?
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Old 12-01-2009, 07:17 PM
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Something is wrong with your dealer if he cannot read the codes. If its alarming, it should be there for him to see.
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Old 12-01-2009, 07:32 PM
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Quote:
Originally Posted by TripleCrownNC View Post
Something is wrong with your dealer if he cannot read the codes. If its alarming, it should be there for him to see.

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Old 12-01-2009, 08:44 PM
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one long beep, overreving... 4 short beeps, check the fuel filter on the engine. you have water in it. they are VERY sensative . change it and put an yamaha 10 micron filter on the fuel line before the bulb.. happened on both mt 135 dfi. problem solved.
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Old 12-07-2009, 07:11 PM
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I have replaced the oil tank/sensor, fuel/water filter, water pump but alarms are still happening.
The dealer DDT checked the onboard computer and it's OK. The boat does not have smart gauges, so the dealer thinks the computer has nowhere to send any signals and maybe confusing itself. He has had the boat for 2 days now and can't find the problem.
May consider a new wiring harness and smartcraft gauge setup.
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Old 12-07-2009, 07:32 PM
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Does the RPM gauge drop for the second or two the alarm is sounding or does it stay steady? Where I am going with this is I had a 99 150 that had a flakey altenator and would throw false alarms. Generally I saw a slight drop in RPMs when the alarm flashed and then it would be be fine, only a split second. The tech could not catch this becuase it was fine 99% of the time.
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Old 12-08-2009, 04:24 AM
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I don't see how the DDT is not picking up the alarm. Once a alarm comes in,it will read out till the alarm has been reset. Maybe your shop doesn't have an up to date card for your motor.
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Old 12-08-2009, 06:40 AM
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I agree with prockvoan and triplecrown

If the alarm is active and sounding the horn then it must be able to be seen with DDT or CDS. Your dealership should be using the laptop (CDS) at this point in the game.

I would take it to another dealer. This is a 5 minute troubleshoot and most likely replacement of the a simple sensor.
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Old 12-08-2009, 06:45 PM
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Quote:
Originally Posted by captbone View Post
.

I would take it to another dealer. This is a 5 minute troubleshoot and most likely replacement of the a simple sensor.
I had the same problem with a dealer diagnosis....Dealer said "No problems" but my alarm would come on during excelleration back off and power back up and alarm would not return until next outing...drove me nutts...so,
Took it to another authorized dealer and problem solved...Turned out the Throttle Control Indicators (TCI) were bad.

Good luck!

Jimmy
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Old 12-08-2009, 07:04 PM
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Quote:
Originally Posted by jjam View Post
I had the same problem with a dealer diagnosis....Dealer said "No problems" but my alarm would come on during excelleration back off and power back up and alarm would not return until next outing...drove me nutts...so,
Took it to another authorized dealer and problem solved...Turned out the Throttle Control Indicators (TCI) were bad.

Good luck!

Jimmy
That sounds like the throttle position sensors.
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