Monitoring Function: Dormant time rationality check
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.
The engine cools down during engine-off-time. The diagnosis uses this characteristic to verify the engine-off-timer measurement.
If the engine is stopped in warm conditions a maximum coolant temperature drop-speed is possible. An engine-off time measurement with a too fast cooling time, shorter than time_min, is irrational.
If the engine temperature has been greater than a threshold at stop and is still greater than another threshold at restart (before entering steady conditions), the engine cannot be off for longer than a certain time time_max.
If the engine-off-timer diverges from the range between time_min an time_max the relative timer is faulty and an error is detected.