Checking The Intake Air Temperature Sensor; Checking The Gear Position Switch - Yamaha YZ450FP 2023 Owner's Service Manual

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c. Start the engine.
d. Measure the throttle position sensor input
voltage.
TIP
If the throttle position sensor is replaced, reset
the ECU using the diagnostic code number "87".
Refer to "DIAGNOSTIC CODE: SENSOR OP-
ERATION TABLE" on page 9-12.
EAM30307
CHECKING THE INTAKE AIR
TEMPERATURE SENSOR
1. Remove:
• Intake air temperature sensor
(from the air filter case)
EWA14110
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
5400–6600  at 0 C (5400–6600
 at 32 F)
Intake air temperature sensor re-
sistance
290–390  at 80 C (290–390  at
176 F)
a. Connect the digital circuit tester () to the
intake air temperature sensor terminal.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
ELECTRICAL COMPONENTS
• Positive tester probe 
Brown/White "1"
• Negative tester probe 
Black/Blue "2"
EAM30467

CHECKING THE GEAR POSITION SWITCH

1. Remove:
• Gear position switch
2. Check:
• Gear position switch
Out of specification  Replace.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
8-54
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