Checking The Intake Air Temperature Sensor; Checking The Fuel Injectors - Yamaha MT-09 2021 Service Manual

2. Check:
• Throttle valve operation
Throttle valves do not fully close → Replace
the throttle bodies.
a. Connect two C-size batteries to the throttle
servo motor terminals "1" as shown.
ECA17660
NOTICE
Do not use a 12 V battery to operate the throt-
tle servo motor.
TIP
Do not use old batteries to operate the throttle
servo motor.
1
1
3 V
1 1
3 V
A. Check that the throttle valves "2" open.
B. Check that the throttle valves "2" fully close.
EAS30594
CHECKING THE INTAKE AIR
TEMPERATURE SENSOR
1. Remove:
• Intake air temperature sensor
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.
ELECTRICAL COMPONENTS
a. Connect the digital circuit tester (Ω) to the
intake air temperature sensor terminal as
shown.
2
b. Immerse the intake air temperature sensor
"1" in a container filled with water "2".
TIP
Make sure that the intake air temperature sensor
terminals do not get wet.
2
c. Place a thermometer "3" in the water.
3
G089057
d. Slowly heat the water, then let it cool down
to the specified temperature.
e. Measure the intake air temperature sensor
resistance.
3. Install:
• Intake air temperature sensor
EAS30681

CHECKING THE FUEL INJECTORS

The following procedure applies to all of the fuel
injectors.
1. Remove:
• Fuel injector
Refer to "THROTTLE BODIES" on page 7-5.
2. Check:
• Fuel injector resistance
Out of specification → Replace the fuel injec-
tor.
8-64
Intake air temperature sensor re-
sistance
5400–6600 Ω at 0 °C
(5400–6600 Ω at 32 °F)
Intake air temperature sensor re-
sistance
289–391 Ω at 80 °C (289–391 Ω
at 176 °F)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
1
2