Which diagnostic test evaluates thermal sensors and fans in MacBook Pro and iMac models?

The Cooling System Diagnostic (CSD) is specifically designed to evaluate the thermal sensors and fans in MacBook Pro and iMac models. This diagnostic test checks the performance and functionality of the cooling system, ensuring that the fans operate correctly and that the thermal sensors accurately monitor and report the internal temperature of the system.

Understanding the role of the cooling system is crucial since overheating can lead to hardware damage or performance throttling. The CSD test helps technicians determine whether the cooling components are functioning as expected, which can prevent potential issues related to overheating that might otherwise affect system performance and longevity.

The other options serve different purposes. For instance, the Trackpad Diagnostic Test focuses on the functionality of the trackpad input, the Audio Input and Output Test assesses sound capabilities, and the Video System Test evaluates visual display output. Each of these tests is tailored to specific hardware functions, highlighting how the CSD is uniquely suited for diagnosing thermal and cooling issues.