Automotive Service Excellence (ASE) Air Conditioner Certification 2025 – 400 Free Practice Questions to Pass the Exam

In diagnosing an Automatic Temperature Control (ATC) system, measuring resistance and voltage drop provides valuable information regarding the operation of temperature sensors.

Temperature sensors, often thermistors, exhibit a specific resistance that changes with temperature. By measuring the resistance of the sensor, you can determine if it is functioning correctly based on its expected values for specific temperatures. If the resistance reading aligns with the expected values, the sensor is likely functioning properly.

Additionally, measuring the voltage drop across the sensor can help confirm whether it is receiving the correct voltage supply and can indicate whether there is a proper functioning circuit. A significant voltage drop could signify issues such as a poor connection or a failure within the sensor itself.

While the other methods mentioned involve useful techniques for testing different components or systems, they do not focus directly on the characteristics and functions of temperature sensors as effectively as measuring resistance and voltage drop does.