ENGINE DIAGNOSTIC SYSTEM, VEHICLE AND ENGINE DIAGNOSTIC METHOD USED FOR THE ENGINE DIAGNOSTIC SYSTEM

摘要

An engine diagnostic system is configured to diagnose the degree of deterioration of an engine installed in a vehicle based on usage frequency information that is information related to the usage frequency of each of a plurality of operating areas divided according to an engine speed and an engine load factor. The engine diagnostic system includes a database configured to store the usage frequency information of each operating area for each individual engine. The usage frequency information is obtained from a plurality of vehicles of the same model. The engine diagnostic system is configured to execute an evaluation process to calculate an evaluation value of the degree of deterioration of a specific engine based on the usage frequency information of each operating area of each engine stored in the database.