What is the MAP sensor?
By P.R. (Preacher) Pollard
The MAP sensor senses BARO pressure every time you start up the bike (when you have the key on/engine off) and it uses that as a baseline for barometric pressure. Then every time you go to WOT (80=100% throttle) the ECM takes another reading from the MAP and uses that as the new BARO baseline. That way, if you started your bike up in Monterey at sea level (you have to turn the key on with the engine off to start it) and you climbed up to Lake Tahoe (<8500 ft. @ Emmits Pass) it would compensate all the way up to Tahoe as you went along, each time you went to WOT.
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