| 摘要 |
A fault-diagnosing device for an evaporation system which is adapted to minimize variations in pressure within a fuel tank and improve the accuracy of diagnosis for determining leakage. To this end, a control section is provided with an additional function for setting purging duty to a predetermined fixed value when determination conditions are fulfilled, the predetermined fixed value being varied in accordance with temperatures and residual fuel amounts. The control section is further provided with an additional function for monitoring a pressure gradient within the fuel tank when a negative pressure is established within the fuel tank, whereby the purging duty is feedback-controlled in accordance with the monitored pressure gradient.
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