teK-- wrote:
Map sensor measures air pressure. Maf sensor measures airflow. The photos posted are a map sensor.
I realise there is a more recent thread on this topic, but in case anyone reads it, the posted photos are not MAP sensors.
They are MAF sensors, which are always found in the air intake. Note that my Forester has one such as in the photos, and it is a MAF & IAT combined. It is easy enough to verify what it is, by putting the printed part number into Google.
The MAP sensor is normally situated near the throttle body and is connected to it via a tube, as the MAP sensor measures air pressure on the engine side of the butterfly valve.
Needless to say, but the air pressure in the air duct is simply atmospheric air pressure.