In this class Scott takes attendees inside the ECU's various calibration tables, functions, constants and more with the overall goal of generating a deeper understanding into how the calibration engineer uses the controller to manage air-fuel ratio, torque output, catalyst warm-up, NVH, power enrichment, emissions, boost, and drivability. We will be using high-performance "Tuner" scan tools and sharing examples of how these fairly inexpensive tools can become a great asset for visualizing scan data during diagnostics.