Troubleshooting - Suzuki GSF650S Service Manual

6-30 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?
YES Go to Step 2.
NO Poor connection of couplers
Step 2
1) Measure the battery voltage between input lead wires (B and B/W) at the ignitor with the ignition switch in
the "ON" position.
Is the voltage OK?
YES Go to Step 3.
• Faulty ignition switch
• Faulty turn signal/side-stand relay
NO
• Faulty engine stop switch
• Broken wire harness or poor connection of related circuit couplers
Step 3
1) Measure the ignition coil primary peak voltage. (!6-32)
NOTE:
This ignition coil primary peak voltage inspection method is applicable only with the multi-circuit tester and
the peak volt adaptor.
Is the peak voltage OK?
YES Go to Step 4.
NO Go to Step 5.
Step 4
1) Inspect the spark plugs. (!2-6)
Is the spark plug OK?
YES Go to Step 5.
NO Faulty spark plug(-s)
Step 5
1) Inspect the ignition coil. (!6-33)
Is the ignition coil(-s) OK?
YES Go to Step 6.
NO • Faulty ignition coil(-s)