10-18 ELECTRICAL SYSTEM
IGNITION SYSTEM
NOTE:
The ignition cut-off circuit is incorporated in this ECM to prevent over-running of engine. If engine rpm
reaches 8 000 r/min., this circuit cuts off ignition primary current for all spark plugs.
TROUBLESHOOTING
CKP
sensor
Cam position
sensor
Wave form
arrangement
circuit
Power source
circuit
Engine stop switch
Ignition
fuse
Ignition
switch
Main
fuse
Battery
#1
#2
CPU
ECM
Wave form
arrangement
circuit
Engine
coolant
temp. sensor
Throttle
position
sensor
CVT control
unit
Under no load, the engine can run over 8 000 r/min, even if the ignition cut-off circuit is effec-
tive, and it may cause engine damage. Do not run the engine without load over 8 000 r/min at
anytime.
No spark or poor spark
Check the ignition system couplers for
poor connections.
Correct
Loose
• Improper coupler connection
Continued on next page
Make sure the engine stop switch is in the “RUN” position
and side-stand is in up-right position. Grasp the front
or rear brake lever. Make sure the fuse is not blown
and the battery is fully-charged before diagnosing.
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