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Characteristic curve and setpoint values

Via a signal line, the engine oil temperature information is transferred to the engine control. The engine oil temperature is used to calculate the fuel injection rate and the nominal idle speed.

The engine oil temperature sensor delivers a signal that can be evaluated by the engine control very quickly after the engine is started.

Fig 1: Engine Oil Temperature Sensor Characteristic Curve
G09908412Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Resistance
2 Characteristic curve
3 Temperature range

Observe the following setpoint values for the engine oil temperature sensor:

Size Value
Signal voltage 0.1 to 3.3 V
Maximum load current 1 mA
Response time Less than 15 s
Temperature range -40 °C to 50 °C