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Characteristic curve and setpoint values

The electrical voltage at the resistor is dependent on the coolant temperature. A table that specifies the temperature associated with each voltage value is stored in the engine control. This compensates for the non-linear relationship between electrical voltage and temperature.

Fig 1: Hot Conductor Characteristic Curve
G09908255Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Voltage
2 Characteristic curve for hot conductor (NTC)
3 Temperature

Please note the following setpoint values for the coolant temperature:

Size Value
Nominal resistance at 25 °C 2252 Ω ± 1.5 %
Power consumption 1 mA
Response time 15 s
Temperature resolution ±1 °C
Maximum output current 20 mA
Temperature range -40 °C to 150 °C