Electrical Troubleshooting - Honda TRX450R Service Manual

ELECTRICAL ('04 - '05)
TROUBLESHOOTING
IGNITION SYSTEM
• Inspect the following before diagnosing the system.
- Faulty spark plug
- Loose spark plug cap or spark plug wire connection
- Water in the spark plug cap (leaking ignition coil secondary voltage)
No spark at plug
Unusual condition
Ignition coil
primary
voltage
Exciter coil
Ignition
pulse gener-
ator
Low peak voltage.
No peak voltage.
Peak voltage is normal, but no spark
jumps at the plug.
Low peak voltage.
No peak voltage.
Low peak voltage.
No peak voltage.
Probable cause (check in numerical order)
1. The multitester impedance is too low; below 10 MSi/
DCV.
2. Cranking speed is too slow. (Operating force of the
kickstarter is weak.)
3. The sampling time of the tester and measured pulse
were not synchronized. (System is normal if measured
voltage is over the standard voltage at least once.)
4. Poorly connected connectors or an open circuit in
ignition system.
5. Faulty exciter coil. (Measure the peak voltage.)
6. Faulty ignition control module (ICM) (in case when
above No. 1 - 5 are normal).
1. Incorrect peak voltage adaptor connections.
2. Short circuit in the engine stop switch (black/white)
wire.
3. Faulty ignition switch and/or engine stop switch.
4. Loose or poorly connected ICM connectors.
5. Open circuit or poor connection in ground wire of the
ICM.
6. Faulty peak voltage adaptor.
7. Faulty exciter coil. (Measure the peak voltage).
8. Faulty ignition pulse generator. (Measure the peak
voltage.)
9. Faulty ICM (in case when above No.1 - 8 are normal).
1. Faulty spark plug or leaking ignition coil secondary
current.
2. Faulty ignition coil.
1. The multimeter impedance is too low.
2. Cranking speed is too slow. (Operating force of the
kickstarter is weak.)
3. The sampling time 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).
1. Faulty peak voltage adaptor.
2. Faulty exciter coil.
1. The multimeter impedance is too low.
2. Cranking speed is too slow. (Operating force of the
kickstarter is weak.)
3. The sampling time 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).
1. Faulty peak voltage adaptor.
2. Faulty ignition pulse generator.
20-5