Yamaha YXR70FX Service Manual page 443

EBS01041
7. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
EBS01040
8. 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 coupler as
shown.
Positive tester probe → gray 1
Negative tester probe → black 2
Gy
1
• Measure the crankshaft position sensor
resistance.
Crankshaft position sensor resis-
tance
459 ~ 561 Ω at 20 °C (68 °F)
• Is the crankshaft position sensor OK?
YES
NO
Replace the main
switch.
B
2
NO
Replace the crank-
shaft position sensor/
stator assembly.
9 - 13
IGNITION SYSTEM
9. Lean angle sensor
• Remove the lean angle sensor.
• Connect the pocket tester (DC 20 V) to the
lean angle sensor coupler as shown.
Positive tester probe → yellow/green 1
Negative tester probe → black/blue 2
65˚ 65˚
UP
• Set the main switch to "ON".
• Turn the lean angle sensor to 65°.
• Measure the lean angle sensor output volt-
age.
Lean angle sensor voltage
Less than 65° ± 5° →
3.55 ~ 4.45 V
More than 65° ± 5° →
0.65 ~ 1.35 V
• Is the lean angle sensor OK?
YES
EBS01047
10.Wiring
• Check the entire ignition system wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the ignition system wiring properly con-
nected and without defects?
YES
Replace the ECU.
– +
ELEC
L Y/G B/L
1
2
NO
Replace the lean
angle sensor.
NO
Properly connect or
repair the ignition
system wiring.