Electrical diagnostic of engine coolant temperature
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 purpose of this diagnosis is to detect electrical faults of the sensor signal. The Input signal is analog from a NTC and has to be in a calibrateable range. Short cut to ground can be detected immediately, short cut to voltage battery or open load. If an error symptom is detected, the error counter is debounced.