Checking The Crankshaft Position Sensor - Yamaha YZ250F 2016 Owner's Service Manual

b. Measure the primary coil resistance.
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3. Check:
• Secondary coil resistance
Out of specification  Replace.
Secondary coil resistance
8.64–12.96 k
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a. Connect the pocket tester (  1k) to the ig-
nition coil.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Ignition coil terminal 1 "1"
• Negative tester probe 
Spark plug lead "2"
b. Measure the secondary coil resistance.
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ELECTRICAL COMPONENTS
CHECKING THE CRANKSHAFT POSITION
EAS1SM9337
SENSOR
1. Disconnect:
• Crankshaft position sensor coupler
(from the wire harness)
2. Check:
• Crankshaft position sensor resistance
Out of specification  Replace.
Crankshaft position sensor resis-
tance
228–342 
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a. Connect the pocket tester (  100) to the
crankshaft position sensor coupler.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Gray "1"
• Negative tester probe 
Black "2"
b. Measure the crankshaft position sensor re-
sistance.
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8-42
1 2
Gy B