Is the small black dot in the middle of the Audi A6L's air conditioning a theft deterrent light?
1 Answers
The small black dot in the middle of the Audi A6L's air conditioning is not a theft deterrent light; it is a temperature sensor. Sensor Introduction: The electronic control system also includes a coolant temperature sensor, which is used for fuel injection correction signals. The coolant temperature sensor is installed on the engine block or cylinder head water jacket, in direct contact with the coolant, to measure the engine's coolant temperature. The temperature sensor used in the coolant temperature gauge is a negative temperature coefficient thermistor (NTC), whose resistance decreases as the temperature increases. One wire is connected to the electronic control unit (ECU), and the other is a ground wire. Sensor Detection Method: When faults such as excessive vehicle load, lack of water, incorrect ignition timing, or non-functioning fan cause the coolant temperature to rise excessively, the engine block temperature increases, preventing the engine from operating. Therefore, a coolant temperature gauge is designed into the instrument system. The coolant temperature sensor detects the engine coolant temperature, allowing the driver to clearly see the coolant temperature under any operating condition and take appropriate action promptly.
