Manifold Absolute Pressure (Map) Sensor; Barometric Pressure (Baro) Sens - Actron CP9087 Service Manual

Section 2
Testing Sensors
FORD
GM/CHRYSLER
TOYOTA/HONDA

Manifold Absolute Pressure (MAP) Sensor

Barometric Pressure (BARO) Sens

What is It?
This sensor is an electronic module which sends a
signal to the computer indicating atmospheric
pressure and/or engine vacuum. Depending upon
sensor type, the signal may be a dc voltage or a
frequency. More pressure (less vacuum) makes the
sensor signal increase (higher voltage or fre-
quency). The computer supplies power and ground
to the sensor.
How it is
The computer needs to know air pressure both
outside and inside the manifold to properly adjust
used?
the air/fuel mixture and ignition timing for varying
engine load and altitude conditions. On turbo-
charged engines, the computer also uses the
sensor to monitor boost pressure and operate the
2-28
wastegate accordingly.