Internal combustion engine diagnostic apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShin Adachi, Hidetoshi Amano
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Abstract
In a diagnostic apparatus for an internal combustion engine, an electronic control unit recognizes occurrence of a misfire in the engine based on fluctuations of the rotational speed of a crankshaft detected by a rotation speed sensor. Based on the detected incidences of misfire, the electronic control unit performs diagnostics. The electronic control unit turns on a warning light when, after the first diagnosis of the presence of an abnormality, a second diagnosis of the presence of an abnormality is made without the return of the engine to the normal state being recognized after a restart of the engine.
Claims10
A diagnostic apparatus for an internal combustion engine, comprising:
- diagnostic means for diagnosing whether an abnormality is present in the engine;
- and
- condition management means for permitting execution of a warning indicating an abnormality of the engine, when a first diagnosis of the abnormality has been made by the diagnostic means and a second diagnosis of the presence of the abnormality is made by the diagnostic means after a restart of the engine.
Dependencies are inferred from the claim text.