2.2 Fault Diagnosis
Spark plug not sparking
Possible causes (Determine the cause from 1 in sequence)
When the high voltage power is too
low.
① Inner impedance is too small. Use appointed tester to test.
②Crankshaft rpm is too low.
③Tester is disturbed (it is normal when more than one time’s
measured voltage is above the basic).
④Wiring of ignition system is poorly contacted.
⑤Ignition coil is no good.
⑥Charging coil is bad. (Peak voltage measurement)
While no high-voltage power supply,
high voltage power is sporadic.
①Tester is wrongly connected.
②Poor ignition switch.
③Connector of CDI assembly is poorly contacted.
④Ground wire for CDI assembly is shorted or poorly contacted.
⑤ Poor charging coil (Peak voltage measurement).
⑥ Defective trigger (Peak voltage measurement).
⑦ Connector of high voltage wire is not good.
⑧ Inferior CDI assembly (after items ①-⑦ are tested and proved
abnormal or spark plug no sparking)
High-voltage power is normal, spark
plug no sparking.
①Inferior spark plug or secondary leakage of the ignition coil.
② Bad ignition coil.
No high-voltage power supply
①Inner impedance is too small. Use appointed tester to test.
②Crankshaft rpm is too low.
③Tester is disturbed (it is normal when more than one time’s
measured voltage is above the basic).
④Charging coil is bad. (when items ①-③ are proved normal)
No high-voltage power supply or
high voltage power is sporadic.
①Defective ignition coil.
②Defective charging coil.
When high-voltage power supply is
too low.
①Inner impedance is too small. Use appointed tester to test.
②Crankshaft rpm is too low.
③Tester is disturbed (it is normal when more than one time’s
measured voltage is above the basic).
④Trigger is bad. (when items ①-③ are proved normal)
No high-voltage power supply or
high voltage power is sporadic.
①Bad ignition coil.
②Bad trigger.
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