Troubleshooting - Yamaha XVZ13TF 1999 Service Manual

EAS00737

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. Starting circuit cut-off relay (diode)
12. Wiring connections
(of the entire ignition system)
NOTE:
Before troubleshooting, remove the following
part(-s):
1) Rider and passenger seats
2) Side cover (left and right)
3) Front cowling
S Troubleshoot with the following special
tool(-s).
Dynamic spark tester
YM-34487
Ignition checker
90890-60754
Pocket tester
YU-03112, 90890-03112
EAS00738
1. Main and ignition fuses
S Check the main and ignition fuses for conti-
nuity.
Refer to "CHECKING THE FUSES" in
CHAPTER 3.
S Are the main and ignition fuses OK?
YES NO
Replace the fuse(-s).
IGNITION SYSTEM
EAS00739
2. Battery
S Check the condition of the battery.
Refer to "CHECKING THE BATTERY" in
CHAPTER 3.
Open-circuit voltage
12.8 V or more at 20_C
S Is the battery OK?
YES
EAS00741
3. Spark plugs
S The following procedure applies to all of the
spark plugs.
S Check the condition of the spark plug.
S Check the spark plug type.
S Measure the spark plug gap.
Refer to "CHECKING THE SPARK PLUGS"
in CHAPTER 3.
Standard spark plug
DPR8EA-9 (NGK)
X24EPR-U9 (DENSO)
Spark plug gap
0.8 X 0.9 mm
S Is the spark plug in good condition, it is of the
correct type, and its gap within specifica-
tion?
YES
8-9
ELEC
NO
S Clean the battery
terminals.
S Recharge or replace
the battery.
NO
Re-gap or replace
the spark plug.