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