Functional description
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A temperature-dependent electrical resistor is used for temperature sensing. The circuit contains a voltage divider where the resistance can be measured depending on the temperature. A temperature is converted using a characteristic curve specific to the sensor. An NTC resistor (NTC) is installed in the coolant temperature sensor, whose resistance value drops when the temperature increases.
| Index | Explanation |
|---|---|
| 1 | Coolant temperature sensor |
| 2 | Coolant pump |
| 3 | Characteristic map thermostat |
| 4 | two-pin plug connection |
The resistance changes from 167 kΩ to 150 Ω depending on temperature, which corresponds to a temperature of -40 °C to 130 °C.