Honda TRX450R Service Manual page 473

IGNITION SYSTEM (After '05)
Shift the transmission into neutral.
Turn the ignition switch to "ON".
Crank the engine with starter motor (TRX450ER) or
kickstarter (TRX450R) and read ignition coil primary
peak voltage.
PEAK VOLTAGE: 100 V minimum
If the peak voltage is lower than the standard value,
follow the checks described in the troubleshooting
chart (page 22-4).
ALTERNATOR EXCITER COIL PEAK
VOLTAGE
NOTE:
• Check the cylinder compression and check that
the spark plug is installed correctly.
Disconnect the 6P black connector from the ignition
control module (ICM).
Connect the peak voltage tester or adaptor probes
to the exciter coil wire terminals of the 6P black con-
nector.
TOOLS:
IgnitionMate peak voltage tester
MTP07-0286
(U.S.A. only) or
Peak voltage adaptor 07HGJ-0020100
(Not available in U.S.A.)
with commercially available digital multimeter
(impedance 10 MU/DCV minimum)
CONNECTIONS:
High: Black/red terminal (+) - White terminal (-)
Low: Blue terminal (+) - White terminal (-)
Shift the transmission into neutral.
Crank the engine with starter motor (TRX450ER) or
kickstarter (TRX450R) and read the exciter coil peak
voltage.
PEAK VOLTAGE: High: 45 V minimum
Low: 15 V minimum
If the peak voltage measured at the ICM connector is
abnormal, measure the peak voltage at the alterna-
tor exciter coil 5P connector.
Remove the right front fender (page 3-6).
Disconnect the alternator exciter coil 5P connector
and connect the tester probes to the wire terminals
of the exciter coil side 5P connector.
CONNECTIONS:
High: Black/red terminal (+) - White terminal (-)
Low: Blue terminal (+) - White terminal (-)
In the same manner as at the ICM connector, mea-
sure the peak voltage and compare it to the voltage
measured at the ICM connector.
• If the peak voltage measured at the ICM is abnor-
mal and the one measured at the alternator
exciter coil is normal, the wire harness has an
open or short circuit, or loose connection.
• If both peak voltages are abnormal, follow the
checks described in the troubleshooting chart
(page 22-4).
6P CONNECTOR
EXCITER COIL 5P CONNECTOR
22-7