| 摘要 |
In an apparatus for treating fuel vapor, in which the fuel vapor in a fuel tank is once adsorbed and trapped in a canister and is then supplied to the intake system of an engine, wherein various valves are so controlled that a predetermined pressure condition is established in a passage for supplying the fuel vapor, and said various valves are diagnosed whether they are defective or not based upon that the practical pressure is becoming as expected or not.
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