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Accessory for voltmeter with maximum range
Multimeter
6.2 Fault Diagnosis
Spark plug not sparking
Ignition coil
When the high voltage power is too
While no high-voltage power supply,
high voltage power is sporadic.
Secondary
side voltage
High-voltage power is normal, spark
plug no sparking.
No high-voltage power supply
Charging coil
No high-voltage power supply or
high voltage power is sporadic.
When high-voltage power supply is
Trigger
No high-voltage power supply or
high voltage power is sporadic.
Symptom
low.
too low.
Possible causes (Determine the cause from 1 in sequence)
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.
coil is no good.
Charging coil is bad. (Peak voltage measurement)
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
abnormal or spark plug no sparking)
Inferior spark plug or secondary leakage of the ignition coil.
Bad ignition coil.
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)
Defective ignition coil.
Defective charging coil.
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)
Bad ignition coil.
Bad trigger.
- 72 -
Ignition
-
are tested and proved
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Troubleshooting
