Checking The Horn; Checking The Coolant Temperature Sensor - Yamaha XT660Z 2008 Service Manual

EAS28180

CHECKING THE HORN

1. Check:
• Horn resistance
Out of specification →Replace.
Coil resistance
1.15–1.25 Ω at 20 °C (68 °F)
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a. Disconnect the horn leads from the horn ter-
minals.
b. Connect the pocket tester (Ω x 1) to the horn
terminals.
Pocket tester
90890-03112
• Positive tester probe → horn terminal
• Negative tester probe → horn terminal
c. Measure the horn resistance.
2. Check:
• Voltage
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a. Disconnect the horn leads from the horn ter-
minals.
b. Connect the pocket tester (DC 20 V) to the
horn leads.
Pocket tester
90890-03112
• Positive tester probe → pink "1"
• Negative tester probe → ground
c. Set the main switch to "ON".
d. Push the horn switch.
e. Measure the voltage (DC 12 V) of pink at the
horn terminal.
ELECTRICAL COMPONENTS
3. Check:
• Horn sound
Faulty sound → Replace the horn.
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a. Disconnect the horn leads from the horn ter-
minals.
b. Connect a battery (12 V) to the horn termi-
nals.
EAS28210
CHECKING THE COOLANT
TEMPERATURE SENSOR
1. Remove:
• Coolant temperature sensor
(from the engine)
WARNING
• Handle the coolant temperature sensor
with special care.
• Never subject the coolant temperature
sensor to strong shocks. If the coolant
temperature sensor is dropped, replace it.
2. Check:
• Coolant temperature sensor resistance
Out of specification → Replace.
Coolant temperature sensor
resistance
2.28-2.63 kΩ at 20 °C (68 °F)
0.305-0.331 kΩ at 80 °C (176 °F)
0.138-0.145 kΩ at 110 °C (230 °F)
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a. Connect the pocket tester (Ω x 1k) to the
coolant temperature sensor terminal as shown.
Pocket tester
90890-03112
3
b. Immerse the coolant temperature sensor "1"
in a container filled with water "2".
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