Diagnostic Overview
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.
To support a sufficient vacuum in the brake booster under all conditions, a vacuum pump is installed at the brake booster. The pump is controlled by a vacuum sensor.
If the sensor or the vacuum pump is malfunctioning, catalyst heating is disabled and cyl 6-10 are deactivated to ensure an error-free operation of the brake system.
In this case the engine emissions are affected.
As the brake booster vacuum pump is energized by a relay, the electrical diagnostics is limited to the relay.
In addition to that the vacuum pump delivery rate is evaluated every time when the monitoring conditions are met.