Yamaha 150 hpdi

[seadog]

Can anyone tell me just what the atmosphreic pressure sw. does? Engine is 2000 Yamaha 150 hp HPDI.

[Sidewinder]

Can anyone tell me just what the atmosphreic pressure sw. does? Engine is 2000 Yamaha 150 hp HPDI.

That is your oxygen sensor, does the same thing as a cars does. ;)

[shucker]

Map sensor measures pressure as in vacuum, o2 sensor measures exhaust gas and makes adjustments for a better burn.So your sensor would be a map.