BMW N55 - Sensors and System Protection

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N55 Engine
System Protection
If the coolant or the engine oil overheat during operation, certain vehicle functions are
influenced to the effect that more energy is available to the engine cooling system.
These measures are divided over two operating modes:
• Component protection
- Coolant temperature between 117°C/242°F and 124°C/255°F
- Engine oil temperature between 150°C/300°F and 157°C/314°F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced
• Emergency
- Coolant temperature between 125°C/257°F and 129°C/264°F
- Engine oil temperature between 158°C/316°F and 163°C/325°F
- Result: The power output of the engine is reduced
(up to 90%)
Crankshaft Sensor
The function of the new crankshaft sensor is identical to that of the crankshaft sensors
used for the automatic engine start-stop function (MSA). The engine reversal detection is
required for the MSA function. (MSA is not currently offered in the US.)