9-22 ELECTRICAL SYSTEM
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 at the ECM with the ignition switch in ON
position. (R/Y and B/W)
Is the voltage OK?
Step 3
1) Measure the ignition coil primary peak voltage. (9-23)
NOTE:
This inspection method is applicable only with the multi circuit tester and the peak volt adaptor.
Is the peak voltage OK?
Step 4
1) Inspect the spark plug. (2-7)
Is the spark plug OK?
YES Go to Step 2.
NO Poor connection of couplers
YES Go to Step 3.
NO
• Faulty ignition switch
• Faulty turn signal/side-stand relay
• Faulty main relay
• Faulty engine stop switch
• Broken wire harness or poor connection of related circuit couplers
YES Go to Step 4.
NO Go to Step 5.
YES Go to Step 5.
NO Faulty spark plug
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