Ignition System Troubleshooting - Honda 2004 CRF250X Service Manual

IGNITION SYSTEM
TROUBLESHOOTING
• Inspect the following before diagnosing the system.
- Faulty spark plug
- loose direct ignition coil or direct ignition coil connector connection
- Water got into the di rect ignition coil (affecting the direct ignition coil secondary voltage)
• If there is no spark at cyli nder, temporarily exchange the direct ignition coil with a known good one and perform the
spark test. If there is spark, the original direct ignition coil is faulty.
No spark at plug
~ioncoil
Unusual condition Probable cause (check in numerical order)
low peak voltage. 1.
Incorrect peak voltage adaptor connections (System is
primary
normal if measured voltage is over the specifications
voltage
with reverse connection).
2. The multi meter impedance is too low; below 10Mnt
DCV.
3. Cranking speed too slow.
- Kickstarter is weak
- Banery under charged
4. The sample tim ing of the tester and measured pulse
were not synchronized (System is normal if measured
voltage is over the standard voltage at least once).
5. Poorly connected connectors or 8n open circuit in the
ignition system.
6.
Faulty exciter coil (measure the peak voltage).
7.
Faulty direct ignition coil.
••
Faulty ICM (When above No.1 - 7 are normal) .
No peak voltage. 1. Incorrect peak voltage adaptor connections (System is
normal if measured voltage is over the specifications
with reverse connection).
2. Short circuit in engine stop bunon w i re.
3. Faulty engine stop bunon.
4.
l oose or poorly connected ICM connectors.
5. An open circui t or loose di rect ignition coi l connector.
6.
Faulty exciter coil (measure the peak voltage).
7.
Faulty ignition pulse generator (measure the peak volt-
age).
••
Faulty ICM (When above No. 1 - 7 are normal) .
Peak voltage is normal, but no spark
,.
Faulty spark plug or leaking direct ignition coil second-
jumps at the plug. ary current ampere.
I
2. Faulty direct ignition coil.
Exciter coil low peak voltage.
1. The multimeter impedance is too low; below 10MnJ
DCV.
2.
Cranking speed is too low.
- Kickstarter is weak
- Banery under charged
3.
The sampling timing of the tester and measured pulse
were not synchronized (System is normal if measured
voltage is over the standard voltage at least once).
4.
Faulty exciter coil (when above No. 1 - 3 are normal).
No peak voltage.
1. Faulty peak voltage adaptor.
r
2. Faulty exciter coil.
Ignition pulse low peak voltage.
1. The multimeter i mpedance is too low; below 10Mru
generator
DCV.
2. Cranking speed is too low.
- Kickstarter is weak
- Banery under charged
3. The sampl ing timing of the tester and measured pulse
were not synchronized (System is normal if measured
voltage is over the standard voltage at least once).
4. Faulty ignition pulse generator (when above No. 1 - 3
are normal).
No peak voltage. 1. Faulty peak voltage adaptor.
2.
Faulty ignition pulse generator.
,
17-4