Yamaha XP500 Service Manual page 490

EAS00746
6. Ignition coil resistance
• Disconnect the ignition coil connectors
from the ignition coil terminals.
• Connect the pocket tester (Ω × 1) to the
ignition coil as shown.
Positive tester probe → red/black
Negative tester probe → orange
• Measure the primary coil resistance.
Primary coil resistance
1.87 ~ 2.53 Ω at 20 °C (68 °F)
• Connect the pocket tester (Ω × 1k) to the
ignition coil as shown.
Negative tester probe → spark plug lead 1
Positive tester probe → spark plug lead 2
• Measure the secondary coil resistance.
Secondary coil resistance
12 ~ 18 kΩ at 20 °C (68 °F)
• Is the ignition coil OK?
YES
NO
Replace the ignition
coil.
IGNITION SYSTEM
EAS00748
7. Crankshaft position sensor resistance
• Disconnect the crankshaft position sensor
coupler from the wire harness.
• Connect the pocket tester (Ω × 100) to the
crankshaft position sensor terminal as
shown.
Positive tester probe → gray 1
Negative tester probe → black 2
• Measure the crankshaft position sensor
resistance.
Crankshaft position sensor resis-
tance
189 ~ 231 Ω at 20 °C (68 °F)
(between gray and black)
• Is the crankshaft position sensor OK?
EAS00749
8. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
8 - 12
ELEC
YES
Replace the crank-
shaft position sensor/
stator assembly.
YES
Replace the
switch/immobilizer
unit.
– +
NO
NO
main