Honda Motorcycle Service Manual page 387

IGNITION SYSTEMS
N o spark a t plugs (Transistorized ignition system)
.
"lnitial voltage" of the ign~tiofl primary c o ~ l is the voltage measured with the ignition switch ON and englne stop switch at
RUN (when the engine is not cranking with the starter motor).
I
Unusual condition
Probables cause (Check i n numerical order)
primary
voltage
lgnition pulse
generator
No initiai voltage with t h ~
ianition switch ON and
-
engine stop switch at
RUN. (Other electrical
components are normal.)
lnitial voltage is normal,
but it d r o ~ s bv
2 - 4
volt
.
.
while cranking the
engine.
lnitial voltage is normal,
but no peak voltage exist:
while cranking the engine
lnitial voltage is normal,
but peak voltage lower
than the standard value.
lnitial voltage and peak
voltage are normal, but
no spark jumps at plug.
Peak voltage is lower
than the standard value.
No peak voltage
O
Faulty engine stop switch.
O
Open circuit between the engine stop switch and ignition coil.
@ Loose or poor connection of the ignition coil primary wire terminal, or
open circuit in primary coil. (Check at the ignition control module
connector.)
@I Faulty ignition control module, i n case when the initial voltage is nor-
mal with the ignition control module connector(s) disconnected.
O
lncorrect peak voltage adaptor connections.
@
Battery is undercharged. (Voltage drops largely when the engine is
started.)
@ No voltage at the power source wire of the ignition control module, or
loose or poorly connected ignition control module connector(s).
@I Poor connection or open circuit in ground wire of the ignition control
module.
@ Loose or poor connections, or open circuit between the ignition coil
and ignition control module.
8
Short circuit in ignition primary coil (except in case the coils are
exchanged and checked on multi-cylinder engine).
Faulty ignition system control circuit such es side stand switch or
reverse switch circuit (for appropriate models only).
@
Faulty ignition pulse generator. (Measure peak voltage.)
8
Faulty ignition control module (in case when above No.
( 0
-
@
are
normal).
O
lncorrect peak voltage adaptor connections.
O
Faulty peak voltage adaptor. (See page 23-17 for inspection.)
@
Faulty ignition control module (in case when above No. and @arc
normal).
O
The multimeter impedance is too low.
O
Cranking speed is too slow.
Battery is undercharged (or operating force of the kickstarter is
weak).
@
The sample t i m i n g of the tester and measured pulse were not
synchronized. (System is normai if measured voltage is over the
specifications at least once.)
@
Faulty ignition coil (except in case the coils are exchanged and checked
on multi-cylinder engine).
O
Faulty ignition control module (in case when above No.
0 )
-
@
are
normal, but no spark jumps at plug).
O
Faulty spark plug or leaking ignition coil secondary current ampere.
@I Faulty ignition coil(s).
0 )
The multimeter impedance is too low.
O
Cranking speed is too slow. -
Battery is undercharged (or operating force of the kickstarter is
weak).
@ The sample t i m i n g of the tester and measured pulse were not
synchronized. (System is normal if measured voltage is over the
specifications at least once.)
@
Faulty ignition pulse generator (in case when above No.
@
-
0)
are
normal)
O
Faulty peak voltage adaptor. (See page 23-1 7 for inspection.)
@I Faulty ignition pulse generator.
Date of Issue : March, 1995
0
HONDA MOTOR CO.,LTD