What is a key action to perform when downloading new information to an ECM?

To successfully download new information to an Engine Control Module (ECM), connecting the data link is essential. This connection serves as the communication bridge between the diagnostic tool and the ECM. When the data link is properly connected, it allows the diagnostic tool to transmit data, including any new updates or information that need to be uploaded to the ECM.

This action is critical because without the data link connection, the ECM cannot receive the necessary information, making the download process impossible. Ensuring a secure and correct connection is fundamental for the integrity of the data transfer process and for the system to function properly afterward. The other options involve actions that would disrupt the communication or functionality of the ECM, thereby hindering the update process.