Checking The Intake Air Pressure Sensor; Checking The Intake Air Temperature Sensor - Yamaha WR250F Owner's Service Manual

• Positive tester probe 
Blue "1"
• Negative tester probe 
Black/Blue "2"
c. Start the engine.
d. Measure the throttle position sensor input
voltage.
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EAS2GB2404 CHECKING THE INTAKE AIR PRESSURE
SENSOR
1. Check:
• Intake air pressure sensor output voltage
Out of specification  Replace.
Intake air pressure sensor output
voltage
3.61–3.67 V at 101.3 kPa (3.61–
3.67 V at 1.01kgf/cm
V at 14.7 psi)
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a. Connect the pocket tester (20 VDC) to the
intake air pressure sensor coupler (wire har-
ness side).
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Pink "1"
• Negative tester probe 
Black/Blue "2"
2
1
2
, 3.61–3.67
ELECTRICAL COMPONENTS
b. Start the engine.
c. Measure the intake air pressure sensor out-
put voltage.
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CHECKING THE INTAKE AIR TEMPERA-
EAS2GB2405
TURE SENSOR
1. Remove:
• Intake air temperature sensor
(from the air filter case)
EWA
WARNING
• Handle the intake air temperature sensor
with special care.
• Never subject the intake air temperature
sensor to strong shocks. If the intake air
temperature sensor is dropped, replace it.
2. Check:
• Intake air temperature sensor resistance
Out of specification  Replace.
Intake air temperature sensor re-
sistance
290–390  at 80 °C (290–390 
176 °F)
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a. Connect the pocket tester (  1k/100) to
the intake air temperature sensor terminal.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Brown/White "1"
• Negative tester probe 
Black/Blue "2"
9-80
2 1