What is the primary function of the Maintenance Support Device (MSD)?

• A. Diagnose vehicle problems and read codes
• B. Repair mechanical failures
• C. Calibrate engine timing
• D. Test aerodynamic efficiency

Answer: (A)

The device is a diagnostic aid that connects to the vehicle’s onboard computer to retrieve diagnostic trouble codes and monitor live data. Its primary purpose is to help pinpoint what’s wrong and guide repairs, not to physically repair components. It isn’t used to calibrate engine timing, nor to test aerodynamic efficiency, and those tasks require different tools or procedures. By reading codes and data, it enables focused troubleshooting and informs the appropriate maintenance actions.