排除故障思路：原则上先排除控制电路故障——再排除发动机自身故障——后排除其它外部故障。
Debugging way of thinking: rule out control circuit fault first in principle-rule out an engine per se again fault-rear row in addition to other outside fault.
排除故障思路：原则上先排除控制电路故障——再排除发动机自身故障——后排除其它外部故障。
Troubleshooting ideas: first, in principle, rule out the control circuit fault - and then ruled out engine failure itself - after the exclusion of other external fault.
发动机控制电路故障，发动机自身故障，其它外部故障。
A, break down an assorting: the engine control circuit breaks down, engine per se fault, other outside fault.
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