false temp alarm Yamaha 150

onetyre · #1 July 29th, 2009, 02:50 PM

Hi I have a 2004 yamaha 150 2 stroke that temp alarm goes on even when I first turn key to on position . after starting the alarm will stay on for 60 seconds It has also gone on a few times once trolling at 1200 rpm and a couple times @3200/3500 rpm if I turn battery switch to off then back to on the alarm goes away. Has had thermostats water pump and temp sensor replaced. Any Ideas ??? THANKS

Eshaw150 · #2 July 29th, 2009, 02:53 PM

when u turn the key u will get an alarm but should not sound for 60 seconds

DMSOUTH · #3 July 29th, 2009, 03:16 PM

Are you sure it's temp alarm? Could also be oil level or water in fuel alarm.

onetyre · #4 July 30th, 2009, 11:24 AM

Thanks for the replies , I had the same problem last season
The alarm is deafening so I don't think it should sound at start up
and the temp icon is flashing while its sounding

rodbolt · #5 July 31st, 2009, 07:16 PM

when you turn the key on on a single engine US market V6 you should get NO alarm period.
there are about 8 ways to set an alarm tone on a V6.
low battery voltage and depending on options in 04 water detect.
without a model number thats about all I can say as the 150 was made in various 2 stoke versions in that year.