Yamaha Yzf R1 2007 Manual

ELECTRICAL COMPONENTS
8-92
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a. Disconnect the ignition coil from the spark 
plug.
b. Connect the ignition checker/dynamic 
spark tester “2” as shown.
c. Set the main switch to “ON”.
d. Measure the ignition spark gap “a”.
e. Crank the engine by pushing the starter 
switch and gradually increase the spark 
gap until a misfire occurs.
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EAS28120
CHECKING THE CRANKSHAFT POSITION 
SENSOR
1. Disconnect:
 Crankshaft position sensor coupler
(from the...

ELECTRICAL COMPONENTS
8-93
c. When turn the lean angle sensor to 65°.
d. Measure the lean angle sensor out put volt-
age.
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EAS4C81020
CHECKING THE STARTER MOTOR OPERA-
TION
1. Check:
 Starter motor operation
Does not operate → Perform the electric 
starting system troubleshooting, starting 
with step 4.
Refer to TROUBLESHOOTING on page 
8-9.
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a. Connect the positive battery terminal “1” 
and starter motor lead “2” with a jumper 
lead “3”....

ELECTRICAL COMPONENTS
8-94
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a. Set the engine tachometer to the ignition 
coil of cylinder #1.
b. Connect the pocket tester (AC 20 V) to the 
rectifier/regulator coupler as shown.
c. Start the engine and let it run at approxi-
mately 5000 r/min.
d. Measure the charging voltage.
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EAS28180
CHECKING THE HORN
1. Check:
 Horn resistance
Out of specification → Replace.
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a. Disconnect the horn leads from the horn...

ELECTRICAL COMPONENTS
8-95
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a. Connect the pocket tester (Ω × 100) to the 
oil level switch terminal as shown.
b. Measure the pickup coil resistance.
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EAS28230
CHECKING THE FUEL SENDER
1. Disconnect:
 Fuel pump coupler
 Fuel sender coupler
(from the wire harness)
2. Remove:
 Fuel tank
3. Remove:
 Fuel pump
(from the fuel tank)4. Check:
 Fuel sender resistance
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a. Connect the pocket tester (Ω × 1) to the 
fuel...

ELECTRICAL COMPONENTS
8-96
b. Set the main switch to “ON”.
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage (DC 5 V) of White/Yel-
low and Black/Blue. With each full rotation 
of the rear wheel, the voltage reading 
should cycle from 0.6 V 4.8V to 0.6 V to 4.8 
V.
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EAS4C81021
CHECKING THE RADIATOR FAN MOTORS
1. Check:
 Radiator fan motor
Faulty/rough movement → Replace.
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a. Disconnect the radiator fan motor coupler 
from...

ELECTRICAL COMPONENTS
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d. Slowly heat the coolant, and then let it cool 
to the specified temperature indicated in 
the table.
e. Check the coolant temperature sensor for 
continuity at the temperatures indicated in 
the table.
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EAS4C81022
CHECKING THE THROTTLE POSITION 
SENSOR (FOR THROTTLE CABLE PUL-
LEY)
1. Remove:
 Throttle position sensor (for throttle cable 
pulley)
(from the throttle body)
2. Check:
 Throttle position sensor (for throttle cable 
pulley) maximum...

ELECTRICAL COMPONENTS
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b. Measure the throttle position sensor (for 
throttle valves) maximum resistance.
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3. Install:
 Throttle position sensor (for throttle valves)
NOTE:
When installing the throttle position sensor (for 
throttle valves), adjust its angle properly. Refer 
to ADJUSTING THE THROTTLE POSITION 
SENSOR (FOR THROTTLE VALVES) on 
page 7-6.
EAS28370
CHECKING THE AIR INDUCTION SYSTEM 
SOLENOID
1. Check:
 Air induction system solenoid resistance
Out of...

ELECTRICAL COMPONENTS
8-99
EAS28390
CHECKING THE CYLINDER IDENTIFICA-
TION SENSOR
1. Check:
 Cylinder identification sensor output volt-
age
Out of specification → Replace.
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a. Connect the pocket tester (DC 20 V) to the 
cylinder identification sensor coupler (wire 
harness side) as shown.
b. Set the main switch to “ON”.
c. Rotate the crankshaft.
d. Measure the voltage (DC 20 V) of White/
Black and Black/Blue. With each full rota-
tion of the crankshaft, the voltage reading...

ELECTRICAL COMPONENTS
8-100
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a. Connect the pocket tester (Ω × 100) to the 
intake air temperature sensor terminal as 
shown.
b. Measure the intake air temperature sensor 
resistance.
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3. Install:
 Intake air temperature sensor
Intake air pressure sensor
resistance
2.21–2.69 kΩ at 20°C (68°F)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe
Brown/White “1”
 Negative tester probe
Black/Blue “2”
Intake air...

ELECTRICAL COMPONENTS
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