Honda CRF50F 2004-2015 Service Manual page 193

IGNITION SYSTEM
TROUBLESHOOTING
• Inspect the following before diagnosing the system.
- Faulty spark plug
- Loose spark plug cap or spark plug wire connections
- Water got into the spark plug cap (leaking the ignition coil secondary voltage)
No sp ark at spark pl ug
Unus ual condition
Probable cause (check in numerical ord er)
Ignition coil Low peak voltage. 1. Incorrect peak voltage adaptor connections (System is
primary
normal
if measured voltage is over
the specifications
voltage with reverse connections).
2.
The mullimeter impedance is too low; 10 MWDCV.
3.
Cranking speed is too low (Operating force of the kick-
starter is weak.)
4. 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.)
5.
Poorly connected connectors or an open circuit in igni-
tion 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 vol t age is over the specifications
with 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. Faulty ICM (in case when above NO.1 - 8 are normal).
Peak voltage is normar, but no spark 1- Faulty spark plug or leaking ignition coil secondary cur-
jumps at plug. rent ampere.
2. Faulty ignition coil .
Exciter coil Low peak voltage. 1- The multimeter impedance is too low; 10 MruDCV.
2. Cranking speed is too slow (Operating force of the kick-
starter is weak.)
3. The sampli ng timing of the tester and measured pulse
were not synchronized. (System is normal if measured
vol t age 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 exciter coil.
Ignition pulse Low peak voltage. 1- The multimeter impedance is too low; 10 MQ/DCV.
generator 2. Cranking speed is too slow (Operating force of the kick-
starter 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 ignition pulse generator (in case when above
NO.1 - 3 are normal).
No peak voltage.
1-
Faulty peak voltage adaptor.
2.
Faulty ignition pulse generator.
14-4