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there's no such thing. hondas and acuras have Manifold Absolute Pressure sensor. simply put, this is the pressure above "0" psi (true vacuum)...considering that normal atmospheric pressure is about 14.7 psi at sea level, but most any gauge you look at will still say 0.

the MAP sensor converts manifold absolute pressure into electrical signals and inputs the ECU.

the MAP sends full voltage with no vacuum, and less voltage with less "absolute air pressure" (more vacuum) this is where you run into trouble with forced induction....the MAP doesn't really read positive pressure (above atmospheric pressure) -- that's why turbo peeps needs to upgrade their OEM MAP to a good aftermarket one to be able to read higher boost.

now when the motor is idling, there should be some vacuum. MAP Voltage will be lower than with the engine off (with ignition ON it should read 2.85 volts).

i think that's it.

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