| 摘要 |
A cold-state emission-reducing strategy wherein a diagnostic apparatus examines for possible malfunctions of a control unit during cold start. The diagnosis judges that the strategy is faulty if the cumulative amount of fuel injection is equal to or smaller than a predeterminable threshold value for a faulty judgement. Thus, the abnormality of the cold-state emission-reducing strategy is accurately and easily detected, by merely calculating the cumulative amount of an injection pulse width for the injector or the cumulative amount of fuel flow during a predeterminable cumulating time period after engine start, and comparing the calculated cumulative amount with the predeterminable judgement threshold.
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