Checking The Throttle Position Sensor Input Voltage - Yamaha YZ125 2022 Owner's Service Manual

11.Stop the engine.
12.Remove:
• Carburetor
Refer to "CARBURETOR" on page 7-3.
13.Tighten:
• Throttle position sensor screw "1"
TIP
Tighten the throttle position sensor screws using
the T20 bit (tamper resistant fastener type) by
aligning the marks "a" that were put before re-
moval.
1 1 1
14.Install:
• Carburetor
Refer to "CARBURETOR" on page 7-3.
EAM30305
CHECKING THE THROTTLE POSITION
SENSOR INPUT VOLTAGE
1. Disconnect:
• Throttle position sensor coupler
2. Start the engine.
3. Check:
• Throttle position sensor input voltage
Out of specification  Replace the CDI unit.
• Positive tester probe 
Blue "1"
• Negative tester probe 
Black/Blue "2"
Throttle position sensor input
voltage
4–6 V
a a a
a a
8-13
ELECTRICAL COMPONENTS
1
2
2
1