Yamaha YZF-R1 Series Service Manual page 483

EAS30574
CHECKING THE FUEL LEVEL WARNING
LIGHT
This model is equipped with a self-diagnosis de-
vice for the fuel level detection circuit.
1. Check:
• Fuel level warning light "1"
(Turn the main switch to "ON".)
Warning light comes on for a few seconds,
then goes off → Warning light is OK.
Warning light does not come on → Replace
the meter assembly.
Warning light flashes eight times, then goes
off for 3 seconds in a repeated cycle (mal-
function detected in fuel sender) → Replace
the fuel pump assembly.
1
EAS30577
CHECKING THE RADIATOR FAN MOTORS
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.
• Positive tester probe
blue "1"
• Negative tester probe
black "2"
ELECTRICAL COMPONENTS
c. Measure the radiator fan motor move-
ment.
EAS30578
CHECKING THE COOLANT TEMPERATURE
SENSOR
1. Remove:
• Coolant temperature sensor
Refer to "CYLINDER HEAD" on page 5-33.
EWA14130
WARNING
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature sen-
sor to strong shocks. If the coolant tem-
perature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification → Replace.
Coolant temperature sensor re-
sistance
2513–2777 Ω at 20 °C (2513–
2777 Ω at 68 °F)
Coolant temperature sensor re-
sistance
210–221 Ω at 100 °C (210–221 Ω
at 212 °F)
a. Connect the digital circuit tester (Ω) to the
coolant temperature sensor as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
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.
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