Mass Air Flow Sensor: General Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 BMW Z4, 2008 BMW X5, 2008 BMW X3, 2008 BMW 528xi, and 2008 BMW 528i. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of the diagnosis is to detect electrical faults and range violations of the mass air flow sensor.
If the period time is over a threshold or no edges are measured, a electrical or upper range failure is indicated. A lower range failure is also checked with a threshold.
After setting the error symptoms, the failure is de-bounced.