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Ignition System
Troubleshooting
Inspect the followings before diagnosing the system.
- Faulty spark plug.
-
Loose spark plug cap or spark plug wire connections
-
Water gotinto the spark plug cap (Leaking the ignition coil secondary voltage).
Temporarily exchange the ignition coil with the other good one and perforrn the spark test. If there is spark, the exchanged
ignition coil is faulty.
No spark at all plugs
Ignition coil
primary
voltage
Exciter coil
Pulse
generator
Unusual coridition
Low peak voltage.
No peak voltage.
Peak voltage is normal, but no spark jumps
at plug.
Low peak voltage.
No peak voltage.
Low peak voltage.
No peak voltage.
Probable cause (Check in numerical order)
(j) The multitester impedance is too low.
o
Cranking speed is too low.
• Battery isundercharged.
@ 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).
@
Poorly connected connectors or an open circuit in ig-
nition system .
.®
Faultv exciter coil. (Measure the peak voltage.)
@ Faulty side stand switch circuito
(j)
Faulty CDI unit (in case when above No. (j)-@ are
normal).
(j)lncorrect peak voltage adaptor connections.
0Short circuir in engine stop switch wire.
@ Faulty ignition switch or engine stop switch.
@
Loose or poorly connected COI unit connector.
®
Open circuir or poor connection in ground wire of
the COI unit.
..
@ Faulty side stand switch circuito
(j)
F-aulty peak voltage adaptor.
®
Faulty excitercoil. (Measure the peak voltage.)
®
Faulty pulse generator. (Measure the peak voltage.)
@
Faulty COI unit (in case when above No. (j)-@ are
normal).
(j) Faulty spark plug or leaking ignition coil secondary
current.
o
Faulty ignition coil.
(j) The multitester impedance is too low.
o
Cranking speed is too low .
• Battery is undercharged.
@ The sampling timing ofthe tester and measured pulse
were not synchronized. (System is normal if measured
voltage is over the standard Jíoltage at least once).
@)
Faulty exciter coil (in case when above No. (j)-@ are
normal).
(j) Faulty peak voltageadaptor.
o
Faulty exciter coil,
(j) The multitester impedance is too low.
o
Cranking speed is too low.
• Battery is undercharged.
@ The sarnplinq'timinqof the tester and measured pulse
were not synchronized. (Svstern is normal if measured
voltage is over the standard voltage at least once).
@
Faulty pulse generator (in
case
when
above
No. (j)-'-@ are normal).
¡
I
(j) Faulty peak voltage adaptor.
o
Faulty pulse generator.
14-3
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