Suzuki Intruder VZR1800, Service Manual

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ELECTRICAL SYSTEM 10-23
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 the “ON”
position. (E-02, 19, 24: O/G and B/W, E-03, 28, 33: O/W and B/W)
Is the voltage OK?
Step 3
1) Measure the ignition coil primary peak voltage. (
!
10-25 to -27)
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 plugs. (
!
2-13 to -16)
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 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(-s).