ELECTRICAL SYSTEM 7-17
IGNITION SYSTEM
NOTE:
The fuel cut-off circuit is incorporated in this ECM in order to prevent over-running of engine. When engine
speed reaches 9 500 r/min, this circuit cuts off fuel at the fuel injector. But under no load, the clutch lever is
pulled or the gear position is neutral, this circuit cuts off fuel when engine speed reaches 9 000 r/min.
"
TROUBLESHOOTING
Under no load, the engine can run over 9 000 r/min, even if the fuel cut-off circuit is effective,
and it may cause engine damage. Do not run the engine without load over 9 000 r/min at any-
time.
ECM
Throttle
position
sensor
Engine
coolant temp.
sensor
Gear
position
switch
Engine stop switch
Side-
stand
relay
Fuse
Fuse
Ignition
switch
Ignition
coil
Spark plug
Battery
Wave form
arrangement
circuit
Wave form
arrangement
circuit
CPU
Power source
circuit
CKP
sensor
Cam position
sensor
# 1
# 2
No spark or poor spark
Check the ignition system couplers for
poor connections.
Loose • Poor connection of couplers
Correct
Continued on next page
* Check that the transmission is in neutral and the
engine stop switch is in the “RUN” position. Pull
the clutch lever. Check that the fuse is not blown
and the battery is fully-charged before diagnosing.
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