Checking The Throttle Position Sensor Input Voltage - Yamaha YZ250 Owner's Service Manual

7. Insert the thin electric conductors
"2" (lead wire) into the throttle po-
sition sensor coupler "1", as
shown, and connect the tester to
them.
Tester (+) lead → Yellow lead "3"
Tester (-) lead → Black lead "4"
• Do not insert the electric conduc-
tors more than required because
it may reduce the waterproof
function of the coupler.
• Make sure that a short-circuit
does not develop between the
terminals because it may cause
damage to electrical compo-
nents.
8. Start the engine.
9. Adjust:
• Throttle position sensor output
voltage
Adjustment steps:
a. Adjust the installation angle of the
throttle position sensor "1" to ob-
tain the specified output voltage.
Throttle po-
Tester se-
sition sen-
lector posi-
sor output
voltage
0.5–0.7 V
10. Put the aligning marks "a" on the
THROTTLE POSITION SENSOR SYSTEM
throttle position sensor and car-
buretor.
11. Stop the engine.
12. Remove:
• Carburetor
Refer to "CARBURETOR AND
REED VALVE" section in the
CHAPTER 4.
13. Tighten:
• Screw (throttle position sensor)
"1"
Tighten the screws (throttle position
sensor) using the T20 bit (tamper re-
sistant fastener type) by aligning the
marks "a" that were put before re-
moval.
14. Install:
• Carburetor
Refer to "CARBURETOR AND
REED VALVE" section in the
CHAPTER 4.
CHECKING THE THROTTLE
POSITION SENSOR INPUT
VOLTAGE
1. Disconnect the throttle position
sensor coupler.
2. Start the engine.
3. Inspect:
• Throttle position sensor input volt-
age
Out of specification→Replace the
tion
CDI unit.
Tester (+) lead → Blue lead "1"
DCV-20
Tester (-) lead → Black/Blue lead
"2"
Throttle po-
Tester se-
sition sen-
lector posi-
sor input
tion
voltage
4–6 V DCV-20
6-10