Throttle Position Sensor System - Yamaha YZ250F(Y) 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 connection.
OK ↓
Check throttle position sensor. (Throttle position
sensor coil)
OK ↓
*Check CDI magneto. (Charging coil)
OK ↓
Check CDI unit. (Throttle position sensor 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.
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