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Tilt sending unit broken.

S

SaltTime

Contributing Member
2010 Honda BF50D, I’ve been trying to chase down why I can’t reach over 4000rpms. Discovered that my tilt/trim position sensor is completely broken and the guts are not inside any longer. Was scanning the internet and found that some mercy engines will make the engine cut out at these rpm ranges.

Is it possible that is my problem? I looked over the wiring diagram and there’s 2 wires out of the 3 coming from the sensor that go into the ecm.

I’m wanting to just bypass it but unsure what wires I’d need to connect with each other. Any ideas? Thanks
 
Hi,

I was hoping someone that knew the answer (because I don't) would have piped up by now so I'll bump the post.

The Yellow with blue stripe (Y/Bu) wire from the sensor goes to the TRMA (trim angle) terminal on the the ECU. And, the Light Green with Black stripe (Lg/Bl) goes to the VCC3 terminal on the ECU.
The Black (Bl) wire is ground and "T's" into the harness

I'm just guessing here but I think that the Y/Bu is the signal wire and the Lg/Bl wire is the power (5 volts?) wire.

At any rate, the wiring diagram looks identical to an automotive throttle position sensor.

So, you are correct that the trim sensor is telling the ECU a "story" about trim angle but I don't know for what reason.

It could be simply to activate the warning buzzer when tilted fully up while running, for connecting to an nmea module, or, as you ask, for engine operating parameters. I don't know.

That information COULD be in the shop manual and I couldn't find it in the free owners manual available from Honda.

I'm just wondering though, why, with a new sensor apparently available (item 2 in he link below) you wouldn't want to just replace yours?

I would definitely advise against bypassing the sensor without full knowledge about how that's done. Because, that would probably send an "out of range" signal OR, if the vcc3 circuit were accidentally grounded, might damage the ECU.


Good luck.
 
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