Checking The Intake Air Pressure Sensor; Checking The Intake Air Temperature Sensor - Yamaha WR450FB 2012 Owner's Service Manual

• Positive tester probe
Blue "1"
• Negative tester probe
Black/Blue "2"
2
c. Start the engine.
d. Measure the throttle position sensor input
voltage.
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EAS28410
CHECKING THE INTAKE AIR PRESSURE
SENSOR
1. Check:
• Intake air pressure sensor output voltage
Out of specification
Intake air pressure sensor output
voltage
3.75–4.25 V
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a. Connect the pocket tester (DC 20 V) to the
intake air pressure sensor coupler (wire har-
ness side) as shown.
Digital circuit tester
90890-03174
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe
Pink "1"
• Negative tester probe
Black/Blue "2"
1
Replace.
9-77
ELECTRICAL COMPONENTS
2
b. Set the main switch to "ON".
c. Measure the intake air pressure sensor out-
put voltage.
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EAS1DX3241
CHECKING THE INTAKE AIR TEMPERA-
TURE SENSOR
1. Remove:
• Intake air temperature sensor
(from the air filter case.)
EWA1DX1010
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
Intake air temperature sensor re-
sistance
5.40–6.60 k at 0 °C (32 °F)
290–390
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a. Connect the pocket tester (
the intake air temperature sensor terminal
as shown.
Digital circuit tester
90890-03174
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe
Brown/White "1"
• Negative tester probe
Black/Blue "2"
1
Replace.
at 80 °C (176 °F)
1k/ 100) to