Yamaha XVS950CU 2014, Service Manual

Page: 397 / 580

IGNITION SYSTEM
7-6
EAS27140
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
TIP
• Before troubleshooting, remove the following part(s):
1. Left side cover
2. Rider seat
3. Fuel tank
4. Rear cylinder right cover
5. Air duct
6. Drive pulley
NG
→
OK
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NG
→
OK
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NG
→
OK
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OK
→
NG
↓
NG
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OK
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NG
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OK
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NG
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OK
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1. Check the fuses.
(Main and ignition and fuel injection
system)
Refer to “CHECKING THE FUS-
ES” on page 7-155.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 7-156. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the spark plugs.
Refer to “CHECKING THE SPARK
PLUGS” on page 3-4. Regap or replace the spark plug(s).
4. Check the ignition spark gap.
Refer to “CHECKING THE IGNI-
TION SPARK GAP” on page 7-162. Ignition system is OK.
5. Check the spark plug caps.
Refer to “CHECKING THE SPARK
PLUG CAPS” on page 7-162. Replace the spark plug cap(s).
6. Check the ignition coils.
Refer to “CHECKING THE IGNI-
TION COILS” on page 7-162. Replace the ignition coil(s).
7. Check the crankshaft position sen-
sor.
Refer to “CHECKING THE CRANK-
SHAFT POSITION SENSOR” on
page 7-163.
Replace the crankshaft position sen-
sor/stator assembly.