Who is correct regarding checking the resistance of an IAT sensor?

In the context of checking the resistance of an Intake Air Temperature (IAT) sensor, both technicians could be correct if they provide valid methods or information about the checking process. The resistance of an IAT sensor is crucial because it helps to determine the temperature of the incoming air, which directly affects engine performance and efficiency.

Typically, an IAT sensor's resistance will change with temperature, meaning that at different temperatures, the sensor will show varying resistance values. Technicians usually use a multimeter to measure this resistance. They would refer to the manufacturer's specifications to see if the measured resistance falls within the acceptable range for the specific sensor being tested. This is an essential step in diagnosing potential issues related to air intake and has implications for fuel mixture calculations and engine performance.

If both technicians provide correct methods for testing or valid interpretations of resistance readings according to specification charts, then the conclusion that both are correct would stand. This underscores the importance of understanding sensor operation and how to test it correctly for effective engine diagnostics.