一辆“金杯”小客车,开出不到20m远突然熄火,熄火后再也不能起动。检查低压电路正常,拆下火花塞检查,火花塞上没有积炭,但中心电极和侧电极之间明显湿润;用旋具顶开断电器触点,点火线圈上引出的高压线端部在离机体3 mm～4mm之间有强烈的火花跳出。显然,故障是由高压总线后的高压电路引起的。为进一步查明故障是否在高压电路,并排除因低压电路接触不良造成假象的 A “Gold Cup” small passenger car, out of less than 20m far suddenly turn off, stop after the flame can no longer start. Check the low-voltage circuit is normal, remove the spark plug check, there is no spark plug charcoal, but the center electrode and the side of the electrode between the obvious wet; with screw top open electrical contacts, the ignition coil leads to high-voltage line end away from the body 3 mm ~ 4mm between a strong spark jumped out. Obviously, the fault is caused by the high voltage circuit behind the high voltage bus. In order to further identify whether the fault in the high-voltage circuits, and exclude poor contact caused by low-voltage circuit caused by the illusion