No Spark Or Poor Spark - Suzuki AN400 Service Manual

1H-4 Ignition System:

No Spark or Poor Spark

Troubleshooting
NOTE
Make sure the engine stop switch is in the "RUN" position and side-stand is in up-right position.
Grasp the front or rear brake lever. Make sue the fuse is not blown and the battery is fully-charged
before diagnosing.
Step
1 Check the ignition system couplers for poor connections.
Is there connection in the ignition system couplers?
2 Measure the battery voltage between input lead wires (O/W
and W) at the ECM with the ignition switch in the "ON"
position.
Is the voltage OK?
3 Measure the ignition coil primary peak voltage. Refer to
"Ignition Coil Inspection (Page1H-5)".
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?
4 Inspect the spark plug. Refer to "Spark Plug Inspection and
Cleaning in Section 0B (Page0B-4)".
Is the spark plug OK?
5 Inspect the ignition coil. Refer to "Ignition Coil Inspection
(Page1H-5)".
Is the ignition coil(-s) OK?
6 Measure the CKP sensor peak voltage and its resistance.
Refer to "CKP Sensor Inspection (Page1H-6)".
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?
Action Yes
Go to step 2.
Go to Step 3.
Go to step 4.
Go to Step 5.
Go to step 6.
• Faulty ECM.
• Poor connection of
ignition couplers.
B705H11804001
No
Poor connection of
couplers.
• Faulty ignition switch.
• Faulty turn signal/
side-stand relay.
• Faulty engine stop
switch.
• Broken wire harness
or poor connection of
related circuit
couplers.
Go to step 5.
Faulty spark plug.
Faulty ignition coil(-s).
• Faulty CKP sensor.
• Metal particles or
foreign material being
stuck on the CKP
sensor and rotor tip.