求翻译：p 在拆卸电控系统部件之前，必须先将点火开关关断（OFF），必要时应拆下蓄电池负极搭铁线，以免损坏电脑或造成电路短路。严禁在发动机运行时，拆卸电控系统部件；是什么意思？

p prior to the demolition of the electronic control system components, you must first ignition switch is turned off (off), when necessary, remove the battery negative ground cable, so as not to damage the computer or cause a short circuit. Prohibited when the engine is running, remove the electronic

Remove the electric parts of the system, you must first turn the ignition switch OFF (OFF) and, if necessary, remove the negative battery ground cable to avoid damage or cause an electrical short circuit. Do not run the engine, remove power control system components.