Throttle Position Sensor System - Yamaha YZ450FY 2009 Owner's Service Manual

THROTTLE POSITION SENSOR SYSTEM

INSPECTION STEPS
If the throttle position sensor will not operate, use the following inspection steps.
Check entire ignition system for connec-
tion.
OK ↓
Check throttle position sensor. (Throttle
position sensor coil)
OK ↓
*Check CDI magneto. (Charging coil)
OK ↓
Check CDI unit. (Throttle position sen-
sor input voltage)
*marked: Refer to "IGNITION SYSTEM" section.
Use the following special tools in this inspection.
Pocket tester:
YU-3112-C/90890-03112
THROTTLE POSITION SENSOR SYSTEM
No good →
Repair or replace.
No good →
Replace.
No good → Replace.
No good →
Replace.
6-8