2013 Yamaha 242 Limited Low Oil Warning

[JLep43]

I was on the lake yesterday with my 2013 242 and the low oil pressure warning alarm came on about 5800 RPM on the port side engine. I checked the level and it was between 1/4 and 1/2 quart low. I topped it off started the motor and it ran for about 15 minutes before doing the same thing. I was able to drive back to the dock as long as the motor was 3500 RPM or so there was no issue, if I tried to get the RPM up it would run for 5 minutes or so and do the same thing. This morning I cut the oil filter open and was happy to see there is no metal in the filter. The boat has less then 200 hours on it. My thought is a faulty oil pressure sensor but wonder why it would only be at higher RPM. The sensor doesn't know what the engine RPM is it only reads pressure.

Any other ideas?

 

[Robert Case]

I just had the exact same problem with my SX 190

 

[cybuch]

Not sure if they changed anything on the newer ECUs, but on the MR1 ECU, the oil pressure alarm wouldn't kick off until it reached 5k RPMs. It designed to ensure high oil pressure at high RPMs

 

[buckbuck]

@cybuch Are you saying you may have low oil pressure under 5000rpm but it won't throw an alarm?

 

[cybuch]

@buckbuck thats exactly what I am saying.

 

[David Martin]

I'm betting, like you it's a failing oil pressure switch...........It read pressure it can have a dead band area that looses contact.......... its a switch.

 

[buckbuck]

@cybuch This explains why the YDS connected to my boat (all MR-1) show the oil pressure switch changes position at idle but returns to normal when running at higher rpm. Yet, I never see an alarm come in.

 

[cybuch]

@buckbuck correct. And the oil pressure switch comes on at ~23 psi, I believe.