Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 366 / 398

ELECTRICAL COMPONENTS
8-67
and the wire harness.
b. Connect the digital circuit tester (DC) to the
test harness S– pressure sensor (3P).
c. Start the engine.
d. Measure the throttle position sensor input
voltage.
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EAM30307
CHECKING THE INTAKE AIR
TEMPERATURE SENSOR
1. Remove:
•
Intake air temperature sensor
(from the air filter case)
WARNING
EWA14110
• 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.
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a. Connect the digital circuit tester (

) to the in-
take air temperature sensor terminal.
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EAM30308
CHECKING THE FUEL INJECTOR
1. Remove:
• Fuel injector
Refer to “THROTTLE BODY” on page 7-6.
2. Check:
•
Fuel injector resistance
Out of specification

Replace.
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a. Disconnect the fuel injector coupler from the
fuel injector.
b. Connect the digital circuit tester (

) to the fuel
injector coupler.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
Test harness S– pressure sensor
(3P)
90890-03207
Test harness S– pressure sensor
(3P)
YU-03207
•
Positive tester probe

Blue “1”
•
Negative tester probe

Black/Blue “2”
2 1
Intake air temperature sensor re-
sistance
5400–6600  at 0  C (5400–6600
 at 32  F)
Intake air temperature sensor re-
sistance
290–389  at 80  C (290–389  at
176  F)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
•
Positive tester probe

Brown/White “1”
•
Negative tester probe

Black/Blue “2”
Resistance
12.0 
1 2