| 摘要 |
PROBLEM TO BE SOLVED: To perform diagnosis of a trouble without worsening drivability and emission even when a fuel vaporization gas generating amount is high. SOLUTION: In a case of F2=1 (during introduction of a negative pressure to a purge system), a control valve Duty to set the valve opening of a purge control valve is read at 822. From the control valve Duty and a differential pressure between an atmosphere pressure and a pressure in an intake pipe, a purge flow rate GPG is read from a given map at 823. Thereafter, from an intake air amount GA during introduction of a negative pressure and a purge flow rate GPG, a purge rate PGR (= GPG/GA) is calculated at 824. A fuel correction value FALEAK = PGR×(FGPGAV -1)×K1 is calculated at 825. In this case, FGPGAV -1 is an air-fuel ratio feedback correction deviation per 1%, and K1 is an error correction factor. Thereafter, guard-processing of a fuel injection amount correction value FAFLEAK is effected to an upper limit guard value KFLEAKMX or less.
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