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2.2 Failure diagnosis
Non-sparking of spark plug
Abnormality
Cause (confirm it sequentially as follows)
Ignition
coil
Too low high-voltage
The inner resistance is too small and it should be
tested by required tester.
Low speed of the crankshaft.
Interfered tester (It is normal that voltage is
always beyond the required value upon several
measurements.)
Poor wiring contact of the ignition system.
Poor ignition coil.
Poor charging coil (measured at the maximum
voltage).
No or interrupted high voltage
Incorrect connection of the tester.
Poor main switch.
Poor contact of CDI terminal.
Short circuit or poor contact of the GND of CDI.
Poor contact of charging coil (measured at the
maximum voltage).
Poor trigger (measured at the maximum voltage).
Poor terminal of high-voltage wires.
Poor CDI group (when item - is checked to be
abnormal or there is no spark for spark plug.)
Side
voltage
Normal high voltage, but no spark
Poor spark plug or secondary leakage of the
ignition coil.
Poor ignition coil.
No high voltage
The inner resistance is too small and it should be
tested by required tester.
Low speed of the crankshaft.
Interfered tester (It is normal that voltage is
always beyond the required value upon several
measurements.)
Poor charging coil (Item - is checked to be
normal.)
Charging
coil
No or interrupted high voltage
Poor ignition coil.
Poor charging coil.
Too low high-voltage
The inner resistance is too small and it should be
tested by required tester.
Low speed of the crankshaft.
Interfered tester (It is normal that voltage is
always beyond the required value upon several
measurements.)
Poor trigger (Item - is checked to be normal.)
Trigger
No or interrupted high voltage
Poor ignition coil.
Poor trigger.
