These files are often associated with tools like , which captures raw engine sensor data (ALDL data) into a text format for review and analysis. Overview of Automotive Data Reviews (WinALDL / TPI)

: Effective reviews usually require roughly 800 seconds (about 13-15 minutes) of driving to capture a range of engine behaviors.

: Capturing this data often requires a specialized cable setup and a laptop, sometimes using a 10k resistor mode to force the vehicle's computer (ECM) into a specific diagnostic state. Informative Highlights for Diagnostic Review