Yamaha F30B 2018, Service Manual

Page: 109 / 348

5-31
Ignition unit and component
g. Start the engine, and then measure the
peak voltage at the specified engine
speed.
h. Stop the engine.
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2. Measure:
• Pulser coil resistance
Out of specification

Replace.
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a. Disconnect the pulser coil connectors.
b. Measure the pulser coil resistance.
c. Connect the pulser coil connectors.
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Checking the intake air temperature
sensor
The intake air temperature sensor is a compo-
nent of the throttle body which cannot be disas-
sembled.
1. Check:
• Intake air temperature sensor operation
Not operating

Check the wire harness
for continuity.
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a. Measure the ambient temperature.
b. Connect the YDIS to display “Intake air
temperature”.
c. Check that the difference between the am-
bient temperature and the displayed intake
air temperature is within

5

C (

9

F).
TIP:
• Check the intake air temperature sensor
when the engine is cold.
• When checking the intake air temperature
sensor, remove the top cowling and do not
start the engine.
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Checking the intake air pressure sen-
sor
The intake air pressure sensor is a component
of the throttle body which cannot be disassem-
bled.
1. Measure:
• Intake air pressure sensor input voltage
Out of specification

Check the wire har-
ness for continuity.
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a. Disconnect the throttle body coupler “a”.
b. Turn the engine start switch to ON, and
then measure the input voltage at the
throttle body coupler.
c. Turn the engine start switch to OFF.
d. Connect the throttle body coupler.
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Resistance
152.0–228.0

a
W /R
B
B
W /R
a
Input voltage
5 V
Orange (Or)–Black (B)
Or B
a