ALARM... Two Beeps every minute

[Mark Kallaway]

I am hoping I am able to explain my current situation well enough that someone out there can steer me in the right direction. I have a 2004 Mercruiser 5.0 MPI Bravo III. The boat has been running well all season. However, I am now getting two 1/2 second beeps every minute. The trim/tilt fluid was low at the time the alarm started. I topped the fluid level off and am not sure this has/had anything to do with the alarm, as the alarm continues despite filling the tilt/trim fluid level. The alarm sounds with 2 beeps when the boat is first started and continues every minute even after getting the boat on plane. There has never been a solid continuous beep alarm.

The gear lube reservoir is full. I thought it might be the IAC valve, but I am not having any idle problems, at least none that I have noticed. I disconnected the electric plug to the IAC valve, but continue to get the 2 beeps every one minute. Can anyone suggest what I might do next?

 

[scoflaw]

Smartcraft water pressure sensor is high on the list, as far as guessing. Getting the ECM read would be a preferred method for an answer

 

[Mark Kallaway]

Scoflaw,

My water psi is reading 0.6 - 0.9 at idle. Is this too low? Would this cause the alarm in question?

 

[scooper321]

The two beeps every minute means the engine is throwing off an error code. You will have to get it read. That will tell you what’s wrong.

 

[Mark Kallaway]

OK..... I was trying to avoid pulling the boat out of the water and driving to the nearest mechanic that had an ECM reader ( not super close )..... so I thought I would start with the most obvious. I replaced the IAC and IAC muffler/filter and the problem is now corrected. Thank you to all who read and responded to this post. Happy boating!