Checking The Crankshaft Position Sensor; Checking The Lean Angle Sensor - Yamaha YFM70RY Service Manual

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a. Disconnect the spark plug cap from the spark
plug.
b. Connect the ignition checker "1" as shown.
Ignition checker
90890-06754
Opama pet-4000 spark checker
YM-34487
2. Spark plug cap
c. Turn the main switch to "ON" and engine stop
switch to " ".
d. Measure the ignition spark gap "a".
e. Crank the engine by pushing the start switch
" " and gradually increase the spark gap un-
til a misfire occurs.
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EAS28120
CHECKING THE CRANKSHAFT POSITION
SENSOR
1. Disconnect:
• Crankshaft position sensor coupler
(from the wire harness)
2. Check:
• Crankshaft position sensor resistance
Out of specification → Replace the crank-
shaft position sensor/stator assembly.
Crankshaft position sensor resis-
tance
192.0–288.0 Ω at 20 °C (68 °F)
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a. Connect the pocket tester (Ω × 100) to the
crankshaft position sensor coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
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ELECTRICAL COMPONENTS
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• Positive tester probe
blue/yellow "1"
• Negative tester probe
green/white "2"
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 lean angle sensor coupler to the
wire harness.
b. Connect the pocket tester (DC 20 V) to the
lean angle sensor coupler as shown.
• Positive tester probe
blue "1"
• Negative tester probe
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yellow/green "2"
8-68
G/W L/Y
2 1
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Lean angle sensor output voltage
Less than 65° "a": 0.4–1.4 V
More than 65° "b": 3.7–4.4 V
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Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
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