Checking The Neutral Switch; Checking The Fuel Injector - Yamaha YZ450F Owner's Service Manual

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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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CHECKING THE NEUTRAL SWITCH

EASB111346
1. Remove:
• Neutral switch
2. Check:
• Neutral switch
Out of specification  Replace.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
1 2
ELECTRICAL COMPONENTS
Continuity
Positive tester probe 
Sky blue "1"
Negative tester probe 
Sensor terminal "a"
Continuity
Positive tester probe 
Pink "2"
Negative tester probe 
Sensor terminal "b"
Continuity
Positive tester probe 
Pink "2"
Negative tester probe 
Sensor terminal "c"
Continuity
Positive tester probe 
Yellow/white "3"
Negative tester probe 
Sensor terminal "d"
Continuity
Positive tester probe 
Yellow/white "3"
Negative tester probe 
Sensor terminal "e"
Continuity
Positive tester probe 
Yellow/white "3"
Negative tester probe 
Sensor terminal "f"
f
b a

CHECKING THE FUEL INJECTOR

EASB111347
1. Remove:
• Fuel injector
Refer to "THROTTLE BODY" on page 7-5.
2. Check:
• Fuel injector resistance
Out of specification  Replace.
Resistance
12.0 
8-46
3 2
e
Y/W P
Sb
d
1
c