Checking The Speed Sensor; Checking The Radiator Fan Motor; Checking The Coolant Temperature Sensor - Yamaha 2010 XMAX YP125R Service Manual

EAS28240

CHECKING THE SPEED SENSOR

1. Check:
• Speed sensor output voltage
Out of specification → Replace.
Output voltage reading cycle
0.6 V to 4.8 V to 0.6 V to 4.8 V
M MMM M MMM M M MMM M
a. Connect the pocket tester (DC 20 V) to the
speed sensor coupler (wire harness end) as
shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
gray "1"
• Negative tester probe →
gray/black "2"
1
Gy
Gy/B
Gy/R
2
b. Set the main switch to "ON".
c. Elevate the front wheel and slowly rotate it.
d. Measure the voltage of gray and gray/black.
With each full rotation of the front wheel, the
voltage reading should cycle from 0.6 V to 4.8
V to 0.6 V to 4.8 V.
L LLL L LLL L L LLL L
EAS28250

CHECKING THE RADIATOR FAN MOTOR

1. Check:
• Radiator fan motor
Faulty/rough movement → Replace.
M MMM M MMM M M MMM M
a. Disconnect the radiator fan motor coupler
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
• Positive tester probe →
red "1"
• Negative tester probe →
black "2"
M MMM M M MMM M M MMM M
P
B/W
O/R
L LLL L L LLL L L LLL L
M MMM M M MMM M M MMM M
ELECTRICAL COMPONENTS
MMM
c. Measure the radiator fan motor movement.
L LLL L LLL L
EAS28260
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
Refer to "CYLINDER HEAD (YP125R)" on
page 5-7 and "CYLINDER HEAD (YP250R)"
on page 5-67.
EWA14130
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.
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a. Connect the pocket tester (Ω × 1k/× 100) to
the coolant temperature sensor terminals as
LLL
shown.
MMM
b. Immerse the coolant temperature sensor "1"
in a container filled with coolant "2".
TIP
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer "3" in the coolant.
8-87
L LLL L L LLL L L LLL L
Coolant temperature sensor re-
sistance
2.32–2.59 kΩ at 20 °C (68 °F)
310–326 Ω at 80 °C (176 °F)
M MMM M M MMM M M MMM M
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
L LLL L LLL
M MMM M MMM