求翻译：所有ECM接头必须密封良好,接头或密封圈损坏必须更换ECM接地线与缸体相连,必须保证接地线连接牢固，插拔ECM4针电源接头时应动作干脆有力,否则有可能因打火损坏ECM。是什么意思？

Ecm connector must be well sealed, and damage to joints or seals must be replaced ecm ground wire and the cylinder is connected, must ensure that the ground wire is securely connected to plug ecm4 pin power connector should be action simply powerful, or they may be due to the ignition damaged ecm.

All ECM joints