Yamaha YZ450F Owner's Service Manual page 194

CHECKING THE THROTTLE
POSITION SENSOR INPUT
VOLTAGE
1. Disconnect the throttle position
sensor coupler.
2. Connect the test harness-speed
sensor (3P) "1" as shown.
Test harness-speed sen-
sor (3P)
YU-03208/90890-03208
3. Start the engine.
4. Inspect:
• Throttle position sensor input volt-
age
Out of specification → Replace
the ECU.
Tester (+) lead → Blue lead (wire
harness color)
Tester (-) lead → Black/Blue lead
(wire harness color)
Throttle po-
Tester se-
sition sen-
lector posi-
sor input
voltage
4–6 V
THROTTLE POSITION SENSOR SYSTEM
tion
DCV-20
7-8