No spark or poor spark
Make sure the engine stop switch is in the "RUN" position and side-stand is in up-right position. Make sure 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 switch couplers?
- YES: Go to Step 2.
- NO: Improper coupler connection.
Step 2
1) Measure the battery voltage between input lead wire (O/G and B/W) at the ECM with the ignition switch in the "ON" position.
Is the voltage OK?
- 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.
Step 3
1) Measure the ignition coil primary peak voltage. (8-25)
Note: The ignition coil peak voltage inspection method is applicable only with the multi circuit tester and peak volt adaptor.
Is the peak voltage OK?
- YES: Go to Step 4.
- NO: Go to Step 5.
Step 4
1) Inspect the spark plug. (2-6)
Is the spark plug OK?
- YES:
- Improper spark plug connection.
- Go to Step 5.
- NO: Faulty spark plug.
Step 5
1) Inspect the ignition coil. (8-26) Is the ignition coil OK?
- YES: Go to Step6.
- NO: Faulty ignition coil.
Step 6
1) Measure the CKP sensor peak voltage and its resistance.
Note: The CKP sensor peak voltage inspection is applicable only with the multi circuit tester and peak volt adaptor.
Is the peak voltage and resistance OK?
- YES:
- Faulty ECM.
- Faulty wire harness.
- Improper ignition coupler connection.
- NO: Faulty CKP sensor.