Yamaha YZF-R15, Service Manual

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8-71
ELECTRICAL COMPONENTS
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b. Move the fuel sender float to minimum
“3”/and maximum “4” level position.
c. Measure the fuel sender resistance.
CHECKING THE RADIATOR FAN MOTOR
1. Check:
• Radiator fan motor
Faulty/rough movement → Replace.
a. Disconnect the radiator fan motor coupler
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
c. Measure the radiator fan motor movement.
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
WARNING
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature sen-
sor to strong shocks. If the coolant temper-
ature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification → Replace.
a. Connect the multimeter ( Ω × 100) to the
coolant temperature sensor terminals as
shown.
b. Immerse the coolant temperature sensor “1”
in a container filled with coolant “2”.
NOTE:
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer “3” in the coolant.
d. Slowly heat the coolant, and then let it cool
down to the specified temperature.
e. Check the coolant temperature sensor resis-
tance.
3. Install:
• Coolant temperature sensor
• Positive tester probe →
blue “1”
• Negative tester probe →
black “2”
1
B
Y
R/W
G
L
B
Coolant temperature sensor re-
sistance
310–326 Ω at 80 °C (176 °F)
Multimeter
8-72
ELECTRICAL COMPONENTS
CHECKING THE THROTTLE BODY SENSOR
ASSEMBLY
WARNING
• Do not remove the throttle body sensor as-
sembly.
• Handle the throttle body sensor assembly
with special care.
• Never subject the throttle body sensor as-
sembly to strong shocks. If the throttle
body sensor assembly is dropped, replace
it.
Throttle position sensor
1. Check:
• Throttle position sensor
a. Connect the digital circuit tester to the termi-
nals of the throttle body sensor assembly
coupler as shown.
b. Measure the throttle position sensor input
voltage.
Out of specification
→ Replace or repair the
wire harness.
c. Connect the pocket tester (DC 20 V) to the
terminals of the throttle body sensor assem-
bly coupler as shown.
d. While slowly opening the throttle, check that
the throttle position sensor output voltage is
increased.
Voltage does not change or it changes
abruptly
→ Replace the throttle body.
Out of specification (closed position) → Re-
place the throttle body.
Intake air pressure sensor
1. Check:
• Intake air pressure sensor output voltage
Out of specification → Replace the throttle
body.
a. Connect the multimeter to the
sensor assembly coupler as shown.
T
R
.
.
Coolant temperature sensor
18 Nm (1.8 m·kg, 13 ft·lb)
• Positive tester probe →
blue terminal “1”
• Negative tester probe →
black/blue terminal “2”
Throttle position sensor input
voltage
5 V
(blue–black/blue)
• Positive tester probe →
yellow/blue terminal “3”
• Negative tester probe →
black/blue terminal “2”
Throttle position sensor output
voltage (closed position)
0.63–0.73 V
(yellow/blue–black/blue)
Intake air pressure sensor output
voltage
0.789–4.000 V at 20.00–101.32
kPa
• Positive tester probe →
pink/white “1”
• Negative tester probe →
black/blue “2”
1 2 3
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L/R
Multimeter
throttle body