System overview

Fig 1: Overview Of Hot Film Air Mass Meter System

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Intake-manifold pressure sensor downstream of throttle valve
2	Intake air temperature pressure sensor
3	Digital engine electronics
4	Hot-film air mass meter
5	Electromotive throttle actuator
6	Blow-off valve
7	Pressure converter