If a trouble code indicates a blend door feedback sensor issue, what should Technician B do?

When a trouble code suggests an issue with the blend door feedback sensor, the appropriate first step is to test the sensor circuit. This process involves checking for proper voltage, continuity, and signal strength to ensure that the sensor is functioning correctly. By testing the circuit, Technician B can determine whether the problem lies with the sensor itself, the wiring, or the control module. This diagnostic step is crucial because it allows the technician to identify the root cause of the issue rather than simply replacing parts, which could lead to unnecessary expenses or further complications.

Changing the blend door or replacing the sensor without verifying circuit conditions may not resolve the underlying problem. Resetting the control module might clear the trouble code temporarily, but it wouldn't address any persistent issues with the sensor circuit that need to be diagnosed. Thus, testing the sensor circuit is the most methodical and effective approach to identifying and resolving the trouble code issue.