Yamaha YP125R - Checking the Lean Angle Sensor; Checking the Starter Motor Operation

ELECTRICAL COMPONENTS
8-84
b. Measure the crankshaft position sensor re-
sistance.
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EAS28130
CHECKING THE LEAN ANGLE SENSOR
1. Remove:
• Lean angle sensor
2. Check:
• Lean angle sensor output voltage
Out of specification → Replace.
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a. Connect the test harness-lean angle sensor
(6P) between the lean angle sensor and wire
harness.
b. Connect the pocket tester (DC 20 V) to the
test harness-lean angle sensor (6P).
c. Set the main switch to “ON”.
d. Turn the lean angle sensor 45°.
e. Measure the lean angle sensor output volt-
age.
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EAS28940
CHECKING THE STARTER MOTOR
OPERATION
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”.
WARNING
EWA13810
• A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
• This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
b. Check the starter motor operation.
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Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
red “1”
• Negative tester probe →
white “2”
Lean angle sensor output voltage
Less than 45°: 0.4–1.4 V
More than 45°: 3.7–4.4 V
Test harness-lean angle sensor
(6P)
90890-03209
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
yellow/green “1”
• Negative tester probe →
gray/black “2”
WR
21
Gy/RY/GGy/B
45˚
45˚
1
2