Marine engine diagnostics is the analysis of the engine's computer system. This analysis is conducted by plugging a special processor into the engine's computer. The processor communicates with a portable laptop computer translating information from the engine's computer. This lets the marine technician know information about the engine which can include: The engine's model number, the engine's serial number, actual engine hours, the engine's RPM history, the engine's running profile, current and stored fault codes, and a data parameter summary. Engine diagnostics can help the technician, boat owner or prospective buyer know and understand the overall condition of the engine. Computerized marine engine diagnostics can save hours of labor time and money on trouble shooting the engine.