| 摘要 |
<p>A method for diagnosing a fuel vapour recovery system using a pump (10) with a membrane (11) particularly including means (12) for generating a signal indicating a predetermined position of the membrane, and a system venting valve (15) that is normally open when the pump is inoperative and closed when it is operative. According to the method, the operation of the valve is diagnosed by comparing a first time (TM1) taken by the membrane to return to the predetermined position after a first series of pumping cycles with a second time (TM2; TM2') taken by the membrane to return to the predetermined position after a second pumping cycle once the pump has been inoperative for a predetermined time (TA).</p> |
