Method for diagnosing exhaust gas purification system associated with internal combustion engine, involves detecting multiple system operating parameters of exhaust gas purification system

摘要

The method involves detecting multiple system operating parameters of an exhaust gas purification system. The system operating parameters are checked by comparison with predeterminable associated comparison values. The system operating parameters have a pump speed of a reducing agent pump (14) that is inserted for conveying the reducing agent to an injector (6).