Honda 2005-2008 RX500 FA Service Manual page 422

'61HN252' by American Honda Motor Co. - Page 422 of 540
[2005-2008] [TRX500 FA/FGA]
IGNITION SYSTEM
Seal the ECM
connector with tape
to prevent dirt and
oil from entering
the connector after
disconnecting the
21P (Black)
connector.
Be careful not to
bend the connector
terminals.
20-6
1 of 1
IGNITION PULSE GENERATOR PEAK
VOLTAGE
· Check that the cylinder compression is normal
and the spark plug is installed correctly in the cyl-
inder head.
Disconnect the 21P (Black) connector from the
engine control module (ECM).
· When reconnecting the ECM 21P (Black) connec-
tor, check that there is no dirt and oil in the con-
nector.
Connect the peak voltage tester or adaptor probes
to the Blue/yellow terminal of the wire harness side
21P (Black) connector and ground.
CONNECTION: Blue/yellow (+) Body ground ()
Shift the transmission into neutral.
Turn the ignition switch to ON.
Crank the engine with the starter motor and read
the ignition pulse generator peak voltage.
PEAK VOLTAGE: 0.7 V minimum
If the voltage measured at the ECM 21P (Black) con-
nector is abnormal, measure the peak voltage at the
alternator connector.
Remove the recoil starter cover (page 2-4).
Disconnect the alternator 5P (Natural) connector
and connect the peak voltage tester or adaptor
probes to the Blue/yellow terminal of the alternator
side connector and ground.
In the same manner as at the ECM connector, mea-
sure the peak voltage and compare it to the voltage
measured at the ECM connector.
· If the peak voltage measured at the ECM connec-
tor is abnormal and the one measured at the
alternator connector is normal, the Blue/yellow
wire has an open or short circuit, or loose con-
nection.
· If both peak voltages are abnormal, follow the
checks described below.
Check the ignition pulse generator.
Check the stator.
for ignition pulse generator replacement.
11-8
http://services.honda.com/ServiceManual/SVC_MNL/61HN253/61HN2...
21P (BLACK) CONNECTOR
ECM CONNECTOR (Viewed
from the terminal side)
PEAK VOLTAGE
ADAPTOR
5P (NATURAL) CONNECTOR
BLUE/YELLOW
3/9/2008 11:20 PM