Honda TRX450R Service Manual page 480

IGNITION SYSTEM (After '05)
CARBURETOR SWITCH
Remove the top cover (page 3-5).
Remove the rear fender (page 3-7).
Disconnect the ICM 4P black connector.
Check for continuity between the terminals of the
connector.
TERMINALS.
Pink/black terminal (+) - Green terminal (-)
There should be continuity when the throttle drum
is fully closed and no continuity when the throttle
drum is open.
If the carburetor switch operation is incorrect, dis-
connect the carburetor switch 2P natural connector
and check for continuity between the terminals of
the switch side.
THROTTLE DRUM CLOSED:
THROTTLE DRUM OPEN:
CONTINUITY
NO CONTINUITY
If the carburetor switch operation is still incorrect,
replace the carburetor switch assembly (page 8-11).
If the carburetor switch is OK, check for open or
short circuit in wire harness.
If both the carburetor switch and wire harness are
normal, replace the ICM and inspect again.
CARBURETOR SWITCH
CONNECTOR
22-14