Yamaha XT660R Service Manual page 397

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
3.4 ~ 4.6 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 → red/black 2
• Measure the secondary coil resistance.
Secondary coil resistance
10.4 ~ 15.6 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 → blue/yellow 1
Negative tester probe → green/white 2
• Measure the crankshaft position sensor
resistance.
Crankshaft position sensor resis-
tance
192 ~ 288 Ω at 20 °C (68 °F)
(between blue/yellow and green/
white)
• 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 - 15
ELEC
G/W L/Y
YES
Replace the crank-
shaft position sensor.
YES
Replace the
switch/immobilizer
unit.
– +
NO
NO
main