Coolant Temperature Sensor/Switch (For Computer): Description and Operation

GF07.04-P-6040KE Component Description For The Coolant Temperature Sensor
- up to model year 08

Component Identification:

The coolant temperature sensor is located at the right front in the cylinder head.

Task
The coolant temperature sensor detects the coolant temperature and transmits a corresponding voltage signal to the ME control unit (N3/10).

Component Identification:

The NTC resistor integrated in the coolant temperature sensor alters its electrical resistance in line with the coolant temperature. The motor electronics control unit applies a sensor voltage of 5 V and evaluates the signal voltage in accordance with the coolant temperature.

NTC means " Negative Temperature Coefficient", which means: the electrical resistance reduces for an increasing temperature (NTC thermistor).

Example: Coolant temperature Resistor
20 °C 3090 ohms ±5%
80 °C 320 ohms ±5%

The connection assignment (polarity) of connection pin 1 and 2 is random.