Checking The Fuel Sender; Checking The Speed Sensor - Yamaha XT660Z 2008 Service Manual

NOTE:
Make sure that the coolant temperature sensor
terminals do not get wet.
c. Place a thermometer "3" in the water.
d. Slowly heat the water, then let it cool down
to the specified temperature.
e. Measure the coolant temperature sensor re-
sistance.
3. Install:
• Coolant temperature sensor
Coolant temperature sensor
18 Nm (1.8 m·kg, 13 ft·lb)
EAS28230

CHECKING THE FUEL SENDER

This model is equipped with a self-diagnosis de-
vice for the fuel sender circuit. If the fuel sender
circuit is defective, the following cycle will be re-
peated until the malfunction is corrected.
• The fuel level warning light will flash four
times and then go off for 3.0 seconds if the fu-
el sender circuit is in short circuit.
• The fuel level warning light will flash eight
times and then go off for 3.0 seconds if the fu-
el sender circuit is interrupted or the coupler
disconnected.
1. Remove:
• Fuel tank
2. Disconnect:
• Fuel pump coupler
• Fuel sender coupler
(from the wire harness)
3. Remove:
• Fuel pump
(from the fuel tank)
4. Check:
• Fuel sender resistance
Out of specification → Replace the fuel pump
assembly.
Fuel sender resistance
1.35–1.65 kΩ at 25 °C (77 °F)
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a. Connect the pocket tester (Ω x 1k) to the fu-
el sender terminal as shown.
Pocket tester
90890-03112
ELECTRICAL COMPONENTS
• Positive tester probe → green/white "1"
• Negative tester probe → black "2"
b. Measure the fuel sender resistance.
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
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a. Connect the pocket tester (DC 20 V) to the
speed sensor coupler (wire harness side) as
shown.
Pocket tester
90890-03112
• Positive tester probe → pink "1"
• Negative tester probe → black/white "2"
b. Turn the main switch to "ON".
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage (DC 5V) of pink and
black/white. 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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