Engine analyzers are designed to assist the technician to diagnose problems in a range of vehicle systems such as emissions, fuel, compression/power performance, charging and starting. The analyzer checks the systems and provides information through visual and printed data that indicate likely problems, probable cause and explanations, test recommendations, component repair/replacement and anticipated performance improvements.
The analyzers are built around a computer platform and driven by CD-ROM software. Most analyzers are designed to enable upgrades and optional capabilities to be installed as service requirements change and grow.
Source: CDX Global & Wikipedia - en.wikipedia.org