Ignition System Troubleshooting - Honda Nighthawk CB 750 1991 Service Manual

Ignition System
Troubleshooting
:
.
No Spark At All Plugs (Faulty Input System)
Ifthere is no spark at all plugs, the problem could be at the input of the ignition system (ignition pulse generator, power
input circuit of the ignition control module (ICM), neutral switch, side stand switch or ICM).
Check for loose or poorly connected ICM
connector.
k
Abnormal--- Poorly connected connector
I
Normal
Check for loose or poorly connected ignition coil
t
Abnormal-.
connectors.
Poorly connected connectors
I
Normal
-No voltage-. Faulty ignition switch or engine stop switch
Open circuit in wire harness -
Loose or poor contact of related circuit con-
nectors
Measure the ignition pulse generator resistance
at the ICM connector (page 14-61,
Check the ignition pulse generator (page 14-7)
I
I I
I
I .
. .
Faulty lgnltlon pulse generator
Open circuit between the ICM and ignition pulse
generator
-
Loose or poor contact of the ignition pulse
generator connector
Check the neutral switch for continuity at the
Check the neutral switch (page 16-8)
ICM connector (page 14-6).
I
I
Normal ~ b n b r m a l
I
I
I i
Faulty neutral switch
4
Open circuit between the ICM and neutral switch
-
Loose or poor contact of the neutral switch
connectors
Checkthe side stand switch atthe ICM connector
Abnormal Check the side stand switch.
(page 14-61,
I
Good Normal Abnormal
I
I
I
t
-
Faulty ICM
t
Faulty side stand
switch
t
.
Open circuit between the ICM and side stand
switch -
Loose or poor contact of the side stand switch
connector