Troubleshooting - Yamaha XV16AL Service Manual

EB802011

TROUBLESHOOTING

The ignition system fails to operate (no
spark or intermittent spark).
Check:
1. main and ignition fuses
2. battery
3. spark plugs
4. ignition spark gap
5. spark plug cap resistance
6. ignition coil resistance
7. pickup coil resistance
8. main switch
9. engine stop switch
10.neutral switch
11.sidestand switch
12.diode
13.relay unit (diode)
14.wiring
(of the entire ignition system)
NOTE:
• Before troubleshooting, remove the fol-
lowing part(s):
1) rider seat
2) fuel tank
3) side covers
4) ignition coils
5) headlight lens unit
• Troubleshoot with the following special
tool(s).
Dynamic spark tester
YM-34487
Pocket tester
YU-03112
7
EB802400
1.Main and ignition fuses
• Check the main and ignition fuses for
continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main and ignition fuses OK?
NO
YES
Replace the fuse(s).
IGNITION SYSTEM
EB802401
2.Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 ˚C (68 ˚F)
• Is the battery OK?
YES
EB802403
3.Spark plugs
The following procedure applies to all of
the spark plugs.
• Check the condition of the spark plug.
• Check the spark plug type.
• Measure the spark plug gap.
Refer to "CHECKING
PLUGS" in chapter 3.
Standard spark plug
DPR7EA-9 (NGK)
X22EPR-U9 (DENSO)
Spark plug gap
0.8 ~ 0.9 mm (0.031 ~ 0.035 in)
• Is the spark plug in good condition, is it
of the correct type, and its gap within
specification?
YES
7 - 13
– +
ELEC
NO
• Clean the battery
terminals.
• Recharge or
replace the battery.
THE SPARK
NO
Re-gap or replace
the spark plug.