Yamaha YZ250F(E), Owner'S Service Manual

Page: 331 / 356

ELECTRICAL COMPONENTS
8-45
2. Check:
• Throttle position sensor maximum resis-
tance
Out of specification

Replace.
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a. Connect the pocket tester (
 
1k) to the
throttle position sensor.
b. Check the throttle position sensor maximum
resistance.
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3. Install:
• Throttle position sensor
TIP
When mounting the throttle position sensor, ad-
just its angle properly. Refer to “ADJUSTING
THE THROTTLE POSITION SENSOR” on
page 7-9.
EAS1SM1345
CHECKING THE THROTTLE POSITION
SENSOR INPUT VOLTAGE
1. Check:
• Throttle position sensor input voltage
Out of specification

Replace the ECU.
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a. Connect the test harness S-pressure sensor
(3P) to the throttle position sensor coupler
and the wire harness.
b. Connect the pocket tester (20 VDC) to the
test harness S-pressure sensor (3P).
c. Start the engine.
d. Measure the throttle position sensor input
voltage.
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EAS1SM1346
Resistance
6.30 k

Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe

Blue “1”
• Negative tester probe

Black/Blue “2”
2 1
Throttle position sensor input
voltage
4–6 V
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Test harness S-pressure sensor
(3P)
90890-03207
YU-03207
• Positive tester probe

Blue “1”
• Negative tester probe

Black/Blue “2”
2
1