No Spark Or Poor Spark - Suzuki RMX450Z Service Manual

1H-3 Ignition System:

No Spark or Poor Spark

Troubleshooting
NOTE
Check that the transmission is in neutral. Check that 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
and B/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 and Plug Cap Inspection" (Page 1H-4).
NOTE
This inspection method is applicable only with
the multi circuit tester and the peak voltage
adaptor.
Is the peak voltage OK?
4 Inspect the spark plug. Refer to "Spark Plug Inspection and
Cleaning" in Section 0B (Page 0B-4).
Is the spark plug OK?
5 Inspect the ignition coil. Refer to "Ignition Coil and Plug Cap
Inspection" (Page 1H-4).
Is the ignition coil OK?
6 Measure the CKP sensor peak voltage and its resistance.
Refer to "Crankshaft Rotation Signal Sensor Inspection"
(Page 1H-7).
NOTE
The CKP sensor peak voltage inspection is
applicable only with the multi circuit tester and
peak voltage adaptor.
Are 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.
• Open or short circuit
in wire harness.
• Poor connection of
ignition wire harness.
BA02J21804002
No
Poor connection of
couplers.
• Faulty ignition switch.
• Faulty engine stop
switch.
• Broken wire harness
or poor connection of
related circuit
couplers.
Go to step 5.
Faulty spark plug.
Faulty ignition coil.
• Faulty CKP sensor.
• Metal particles or
foreign material being
stuck on the CKP
sensor and rotor tip.