| 摘要 |
PROBLEM TO BE SOLVED: To provide a leakage diagnostic device for an evaporated fuel processing device capable of executing accurate leakage diagnosis by derermining that outside temperature is in a temperature range suitable for leakage diagnosis of an evaporated fuel processing device without providing an outside temperature sensor. SOLUTION: Determination is made during vehicle travelling whether or not an outside temperature condition in which outside temperature is in a prescribed range is established in accordance with a reduced amountΔTA of intake temperature TA detected by an intake temperature sensor. TheΔTA1 table orΔTA2 table in which temperature reduced amount taken as a criterion is set is selected in accordance with intake temperature TAINI at engine start and vehicle speed VP. The temperature reduced amountΔTA1 orΔTA2 is calculated in accordance with the intake temperature TA. The outside temperature condition is determined from the relationship between the intake temperature reduced amountΔTA and the temperature reduced amountΔTA1 orΔTA2 (S104, S105, S109, S111, S112). COPYRIGHT: (C)2005,JPO&NCIPI
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