Troubleshooting - Yamaha XV19SW Service Manual

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
1. Check the fuses.
(Main, ignition and ECU)
Refer to "CHECKING THE FUS-
ES" on page 7-75.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 7-76.
OK ↓
3. Check the spark plugs.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-9.
OK ↓
4. Check the ignition spark gap.
Refer to "CHECKING THE IGNI-
TION SPARK GAP" on page 7-82.
NG ↓
5. Check the spark plug caps.
Refer to "CHECKING THE SPARK
PLUG CAPS" on page 7-83.
OK ↓
6. Check the ignition coils.
Refer to "CHECKING THE IGNI-
TION COILS" on page 7-83.
OK ↓
7. Check the crankshaft position sen-
sor.
Refer to "CHECKING THE CRANK-
SHAFT POSITION SENSOR" on
page 7-84.
OK ↓
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Re-gap or replace the spark plug(s).
OK →
Ignition system is OK.
NG →
Replace the spark plug cap(s).
NG →
Replace the ignition coil(s).
NG →
Replace the crankshaft position sensor.
7-4
IGNITION SYSTEM