| 摘要 |
A diagnostic system for an internal combustion engine (1), the diagnostic system includes an electronic control unit (10). The electronic control unit determines that whether a predetermined condition is satisfied. The predetermined condition is a condition under which an amount of PM that separates from a filter is larger than or equal to a predetermined separation amount as a urea water-originated deposit once accumulated in the filter separates in gaseous form. When the electronic control unit determines that the predetermined condition is satisfied, the electronic control unit does not execute a diagnosis of a malfunction in the filter based on a filter differential pressure until a predetermined period elapses from the point in time at which it is determined that the predetermined condition is satisfied. |
