An intake manifold gasket has been replaced due to a vacuum leak. Which of the following steps uses a scan tool to complete the job?

After replacing an intake manifold gasket due to a vacuum leak, performing an idle relearn is crucial because it ensures that the engine control module (ECM) understands the new parameters of the engine's air/fuel mixture. When the intake manifold is removed and replaced, changes in air flow and temperature can affect idle quality. The idle relearn procedure recalibrates the throttle position and allows the ECM to adapt to any changes in airflow and engine demands that may have resulted from the gasket replacement or adjustment.

This step is necessary to guarantee that the engine runs smoothly and that all sensors and actuators are correctly communicating with the ECU after such repairs. By using the scan tool for the idle relearn, technicians can confirm that any learned parameters are adjusted according to the new configuration of the manifold and ensure optimal engine performance.