Yamaha XV19SX(C), Service Manual

Page: 395 / 494

IGNITION SYSTEM
7-4
EAS27140
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Tool kit tray
3. Rider seat bracket assembly
4. Fuel tank
5. Air filter case
6. Headlight assembly
7. Exhaust pipes
8. Front cylinder
NG
→
OK
↓
NG
→
OK
↓
NG
→
OK
↓
OK
→
NG
↓
NG
→
OK
↓
NG
→
OK
↓
1. Check the fuses.
(Main, ignition and ECU (for
XV19S(C)/ XV19M(C)/
XV19CTS(C)/ XV19CTM(C)))
Refer to “CHECKING THE FUS-
ES” on page 7-75.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 7-76. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the spark plugs.
Refer to “CHECKING THE SPARK
PLUGS” on page 3-9. Re-gap or replace the spark plug(s).
4. Check the ignition spark gap.
Refer to “CHECKING THE IGNI-
TION SPARK GAP” on page 7-83. Ignition system is OK.
5. Check the spark plug caps.
Refer to “CHECKING THE SPARK
PLUG CAPS” on page 7-83. Replace the spark plug cap(s).
6. Check the ignition coils.
Refer to “CHECKING THE IGNI-
TION COILS” on page 7-84. Replace the ignition coil(s).