An ignition coil takes voltage from the battery and multiplies it to create a spark at the spark plugs, which in turn ignites the engine. Cars have been using some form of the coil ignition system ...

Check the resistance on both the primary and secondary circuits. Get Help On How To Test An Ignition Coil From a Certified Mechanic ...

The CDI-AC (Capacitor Discharge Ignition – Alternating Current) system in the 139QMB engine is crucial for generating the electrical spark needed to ignite the fuel-air mixture within the engine.