Checking The Speed Sensor; Checking The Radiator Fan Motor; Checking The Radiator Fan Motor Circuit Breaker - Yamaha YFM70RY Service Manual

1 2
O/G B/W B R/L
a. Fuel level 79.5 mm (3.13 in)
b. Measure the fuel sender current.
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EAS28240

CHECKING THE SPEED SENSOR

1. Check:
• Speed sensor output voltage
Out of specification → Replace.
Output voltage reading cycle
0.6 V–4.8 V–0.6 V–4.8 V–0.6 V
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a. Connect the pocket tester (DC 20 V) to the
speed sensor coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
white "1"
• Negative tester probe
black/blue "2"
DC 5A
a
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ELECTRICAL COMPONENTS
b. Set the main switch to "ON".
c. Elevate the rear wheels and slowly rotate
them.
d. Measure the voltage (DC 20 V) of white and
black/blue. With each full rotation of the rear
wheel, the voltage reading should cycle from
0.6 V to 4.8 V to 0.6 V to 4.8 V.
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EAS28250

CHECKING THE RADIATOR FAN MOTOR

1. Check:
• Radiator fan motor
Faulty/rough movement → Replace.
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LLL
a. Disconnect the radiator fan motor coupler
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
• Positive battery terminal
blue "1"
• Negative battery terminal
black "2"
MMM
c. Measure the radiator fan motor movement.
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EAS1S3L042
CHECKING THE RADIATOR FAN MOTOR
CIRCUIT BREAKER
1. Remove:
• Radiator fan motor circuit breaker
(from the wire harness)
8-71
P O/R L
B/W B/L
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1
W
2
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