Honda C8R600F4 Service Manual page 315

TROUBLESHOOTING
•Inspect the following before diagnosing the system.
-Faulty spark plug
Loose
dire1:,;l
i~11iliu11 cuil
conneclion:s
IGNITION SYSTEM
-Water got into the direct ignition coil (ignition coil secondary voltage leak)
• If there is no spark at any cylinder, temporarily exchange the direct ignition coil with another good one and perform the
spark test. If there is spark, the exchanged direct ignition coil is faulty.
• "Initial voltage" of the ignition primary coil is the battery voltage with the ignition switch ON and engine stop switch at
RUN (when the engine is not cranking by the starter motor).
NO SPARK AT SPARK PLUGS
1-------~U_N_U_S_U
__
A_~
CONDITION
Ignition coil
primary
voltage
Ignition
pulse
generator
No initial voltage with the ignition
switch ON and engine stop switch at
RUN. (Other electrical components
are normal.)
lnilial voltage is normal,
but
it drop:;
down to 2-4 V while cranking the
engine.
Initial voltage is normal, but no peak
voltage exists while cranking the
enoine.
Initial voltage is normal, but peak
voltage is lower than the standard
value.
Initial voltage and peak voltage are
normal, but no spark jumps at plug.
Peak voltage ls lower than the stan-
dard value.
No peak voltage.
PROBABLE CAUSE (Check in numerical order)
1. Faulty engine stop switch.
2. An open circuit in black/white wire between the direct
ignition coil and engine stop switch.
3. Loose or poor connection of the ignition coil primary wire
terminal. or an open circuit in primary coil. (Check at the
ignition control module (ICM) connector.)
4. Faulty ICM when the initial voltage is normal while
disconnecting ICM connector.
1. Incorrect peak voltage adaptor connections.
2. Battery is undercharged. (large voltage drops when the
engine is started.)
3. No voltage between the black (
+)
and ground (-) of the
ICM connector, or loose or poorly connected ICM.
4. Poor connection or open circuit in green (ground) wire of
the ICM.
5. loose or poor connections, or open circuit in blue/black,
yellow/white, red/blue and red/yellow between the direct
ignition coils and ICM.
6. Faulty side stand switch or neutral switch.
I.
An open circuit or loose connection in No.
6
related circuit
wires.
•Side stand switch line: green/white wire
• Neutral switch line: liqht qreen wire
8. Faulty ignition pulse generator. (Measure peak voltage.)
9. Faulty ICM (when above No. 1 thru. 8 are normal).
1. Incorrect peak voltage adaptor connections.
2. Faulty peak voltage adaptor.
3. Faulty ICM (when above No. 1 and 2 are normal).
1. The multimeter impedance is too low; below 10 M Q/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
Faultv
ICM (whAn ::ihnvA Nn. 1 thrn.
~;:in~
nnrm::il)
1. Faulty spark plug or leaking ignition coil secondary current
ampere.
2.
Faulty direct ignition coil(s).
1.
The multimeter impedance is too low; below 10 M Q/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 ignition pulse generator (when above No. 1 thru. 3
are··~·
.. ·:.
1. F .k ltag ---..---
2. Faulty iqnition oulse oenerator.
17-3