4. Diagnose the cause of weak spark with instantaneous short circuit method
When the breaker contact is open, turn on the ignition switch, and conduct jump spark test of the central high-tension lead by instantaneous ground between the "-" terminal of ignition coil (leaving quickly after wire the terminal is grounded), to see whether the spark at the terminal of the high-tension lead becomes stronger. If the spark becomes stronger, it is necessary to check the contact of the breaker, capacitor and other components; If the spark is still weak, check or replace the ignition coil.
5. Diagnose the cause of no spark jump with instantaneous short circuit method
When the breaker is disconnected, the ignition coil "-" and conduct jump spark test of the central high-tension lead by instantaneous ground between the ignition coil. If there is jump spark, it is necessary to check breaker contact, capacitor and other components. If the spark is still not jumping, then see if there is a spark when grounding at the moment. If not, check whether the low-voltage loop circuit of the ignition system is open circuit or the primary winding of the ignition coil is open circuit; If there is a spark when contacting. check whether the secondary winding of the ignition coil is open or short circuit fault, and whether central high-tension lead is open.
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