| 摘要 |
PROBLEM TO BE SOLVED: To provide an abnormality diagnostic device for an evaporated gas purge system of an internal combustion engine capable of reducing power consumption during halts of an engine, and improving detection accuracy. SOLUTION: During operation of an engine, an abnormality diagnosis for an evaporated gas purge system is performed by a negative pressure monitor program, then only whenϕ0.5 tentative abnormality judgment is made,ϕ0.5 tentative abnormality judgment shown in (c) is determined to perform an abnormality diagnosis by an inner pressure monitor program during halts of an engine. Thus, the final judgment onϕ0.5 leak is determined by the inner pressure monitor program with low disturbance, thereby performing the abnormality diagnosis with high accuracy. Furthermore, the inner pressure monitor program is carried out only when the judgment onϕ0.5 tentative abnormality is determined, thereby reducing electric power consumed by ECU during halts.
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