Comprehensive Component Monitoring OBDII Siemens VDO function definition: Strategy: Notes
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.
Principle:
Sensors that can affect emissions or are used to monitor other component / system are monitored for circuit continuity and short to battery voltage and / or to ground using high and low voltage signal limit.
Actuators that can affect emissions or are used to monitor other component / system are monitored by power stage voltage check for valid signals.
For some of sensors or actuators, plausibility checks are included to ensure proper operation of the components.