Checking The Intake Air Pressure Sensor; Checking The Intake Air Temperature Sensor; Checking The Neutral Switch - Yamaha YZ450F(E) 2014 Owner's Service Manual

CHECKING THE INTAKE AIR PRESSURE
SENSOR
1. Check:
• Intake air pressure sensor output voltage
Out of specification  Replace.
Intake air pressure sensor output
voltage
3.57–3.71 V at 101.3 kPa
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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/Black "1"
• Negative tester probe 
Black/Blue "2"
b. Start the engine.
c. Measure the intake air pressure sensor out-
put voltage.
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CHECKING THE INTAKE AIR TEMPERA- EAS1SL1346
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.
P/B
P/B
2 1
ELECTRICAL COMPONENTS
2. Check:
• Intake air temperature sensor resistance
Out of specification  Replace.
Intake air temperature sensor re-
sistance
290–390  at 80 °C (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"
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EAS1SL1347

CHECKING THE NEUTRAL SWITCH

1. Remove:
• Neutral switch
2. Check:
• Neutral switch
Out of specification  Replace.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
8-46
1 2