ELECTRICAL SYSTEM 8-17
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 16 000 r/min, this circuit cuts off fuel at the fuel injector.
TROUBLESHOOTING
No spark or poor spark
NOTE:
Check that the transmission is in neutral and the engine stop switch is in the “RUN” position. Grasp the
clutch lever. Check that the fuse is not blown and the battery is fully-charged before diagnosing.
Step 1
1) Check the ignition system couplers for poor connections.
Is there connection in the ignition system couplers?
Step 2
1) Measure the battery voltage between input lead wires (O/W and B/W) at the ECM with the ignition switch
in the “ON” position.
Is the voltage OK?
YES Go to Step 2.
NO Poor connection of couplers
YES Go to Step 3.
NO
• Faulty ignition switch
• Faulty engine stop switch
• Broken wire harness or poor connection of related circuit couplers
Battery
Regulator
/rectifier
Generator
ECT
sensor
GP
switch
Ignition coil
Ignition
switch
Engine
stop
switch
Fuse
(20A)
ECM
Fuse
(10A)
O/W
B/W
W/BI
B/W
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