Honda CBR650RA Shop Manual page 195

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TROUBLESHOOTING
• Inspect the following before diagnosing the system.
– Faulty spark plug
– Loose spark plug cap or spark plug wire connection
– Water got into the spark plug cap (Leaking the ignition coil secondary current)
• If there is no spark at cylinder, temporarily exchange the ignition coil with a known good one and perform the spark test. If there
is spark, the original ignition coil is faulty.
• "Initial voltage" of the ignition primary coil is the battery voltage with the ignition switch turned ON and engine stop switch turned
" " (The engine is not cranked by the starter motor).
ED, IIED, IIIED, IVED, FO, IIFO, KO, IIKO models
No spark at spark plug
Unusual condition
Ignition coil No initial voltage with the ignition
primary voltage switch turned ON and engine stop
switch turned " " (Other electrical
components are normal).
Initial voltage is normal, but it drops by
2 – 4 V while cranking the engine.
Initial voltage is normal but there is no
peak voltage while cranking the
engine.
Initial voltage is normal but peak
voltage is lower than the standard
value.
Initial and peak voltages are normal
but no spark jumps.
Probable cause (Check in numerical order)
1. An open circuit in the Black/blue wire between the main
relay and ignition coil.
2. Faulty main relay or its related circuits.
3. Loose or poor connection of the primary terminal, or an
open circuit in the primary coil.
4. Faulty ECM (in case when the initial voltage is normal with
the ECM connector disconnected).
1. Incorrect peak voltage adaptor connections (System is
normal if measured voltage is over the specifications with
reverse connections).
2. Battery is undercharged (Voltage drops largely when the
engine is started).
3. No voltage between the Black/blue (+) wire and body
ground (–) at the ECM connector or loose ECM connection.
4. An open circuit or loose connection in the Green wires of
the ECM.
5. An open circuit or loose connection in the Pink/blue or Pink/
black wire between the ignition coil and ECM.
6. Inspect the engine stop switch signal line (page 5-10).
7. Faulty sidestand switch or gear position switch.
8. Loose or poor connection or an open circuit in No. 6 related
wires.
– Sidestand switch line: Green/pink, Black/blue, Black and
Green
– Gear position switch line: Light green/white, Light green
9. Inspect the CKP sensor (page 4-82).
10.Faulty ECM (in case when above No. 1 through 9 are
normal).
1. Incorrect peak voltage adaptor connections.
2. Faulty peak voltage adaptor.
3. Faulty CKP sensor.
4. Faulty ECM (in case when above No. 1 through 3 are
normal).
1. The multimeter impedance is too low; below 10 MΩ/DCV.
2. Cranking speed is too slow (Battery is undercharged).
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 ECM (in case when above No. 1 through 3 are
normal).
1. Faulty spark plug or leaking ignition coil secondary current.
2. Faulty ignition coil.
IGNITION SYSTEM
5-3