Ignition System Troubleshooting; No Spark At Spark Plug - Honda 2000 XR50R Service Manual

IGNITION SYSTEM
TROUBLESHOOTING
Inspect the following before diagnosing the system.
- Faulty spark plug
- Loose spark plug cap or spark plug w ire connections
-Water got into the spark plug cap (leaking the ignition coil secondary voltage)
No spark at spark plug
Unusual condition
Probable cause (Check in numerical order)
Ignition coil low peak voltage
1. Incorrect peak voltage adaptor connections (System
is normal if
primary
measured voltage
;, over
the specifications
with raverse
voltage
connections).
2. The multimeter impedance is too low; 10M Q/DCV.
3. Cranking speed is too low (operating force of the kickstarter is
weakJ.
4. The sampling timing of the tester and measured pulse were not
synchroni zed (System is normal if measured voltage is over the
standard voltage at least once).
5. Poorly connected connectors or an open circuit in ignition system.
6. Faulty exciter coil (Measure peak voltage).
7. Faulty ignition coil.
8. FaultY ICM (in case when above No. 1- 7 are normal).
No peak voltage 1. Incorrect peak voltage adaptor connections (System is normal if
measured
voltage
;,
over the specifications wi th reverse
connections).
2. Short circuit in ignition switch wire or engine stop switch wire
(black/white).
3. Faulty ignition switch or engine stop switch.
4. Loose or poorly connected ICM connectors.
5. Open circuit or poor connection in ground wire (green) of the ICM.
6. Faulty peak voltage adaptor.
.
7. Faulty exciter coil (Measure peak voltage) .
8. Faulty ignition pulse generator (Measure peak voltage).
9. FaultyJCMUn case when above No. 1- 8 are normal).
Peak voltage is normal, but 1.Faulty spark plug m leaking ignition coil secondary current
no spark jumps at plug
ampere.
2. Faultv ionition coil.
Exciter coil Low peak voltage
1. The multi meter impedance is too low; 10 M
C/DCV.
2. Cranking speed is too slow (operating force of the kickstarter is
weak).
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 (in case when above No. 1- 3 are normal).
No peak voltage 1. Faulty peak voltage adaptor.
2. FaultY
~xciter
coil.
Ignition
Low peak voltage 1. The
multimeter impedance is too low; 10 M Q/OCV.
pulse 2. Cranking speed is too slow (operating force of the kickstarter is
generator weak).
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 ignition pulse generator (in case w hen above No. 1 - 3 are
normal).
No peak voltage 1. Faulty peak voltage adaptor.
2. FaultY ianition Dulse generator.
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