I am having a alarm beeping about 10 seconds after the engine is started. I believe it is the ECU alarm as it is beeping and not a constant long tone. There are two circuits on the 500EFI one general alarm for the drive bottle, water temp and oil pressure and the one for the ECU.

I just want to make sure if this is correct, beeping is from ECU and continuous is from the general circuit.

I am going to the boat this weekend and I have a scan tool and just wanted to verify. Also if it is a ECU alarm what typically will set this off after 10 seconds of running? EFI problems or what?

Last time it happend I kept shuttung off the motor and after about 10 restarts it quit. Then after a 1/2 hour run the next time I started it (warm) it alarmed again.

Any input would be great. I am hoping the scan tool will show the fault(s).

Thanks

Yes, the scan tool will tell you.

I just had a beep every three seconds on my port engine and got a code 23 and a code 34.

We replaced the air intake temp sensor and the map air sensor and all is fine.

The scan tool made life easy.

Good luck

Where and how much are these scan tools?

Rinda technology make a dedicated merc scantool or you could spring a few more bucks and get their Diacomm software to turn your laptop into a great scan tool. Rinda.com.

http://216.230.203.183/marine/mtspec.htm

Rinda Tech