Troubleshooting - Yamaha XP500 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 plug
4. ignition spark gap
5. spark plug cap resistance
6. ignition coil resistance
7. crankshaft position sensor resistance
8. main switch
9. engine stop switch
10.sidestand switch
11.starting circuit cut-off relay 1
12.lean angle cut-off switch
13.wiring connections (of the entire ignition
system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. battery cover
2. rear cover
3. front cowling
4. leg shield
5. footrest board
6. inner fender
• Troubleshoot with the following special
tool(s).
Ignition checker
90890-06754, YM-34487
Pocket tester
90890-03112, YU-03112-C
EAS00738
1. Main and ignition fuses
• Check the main and ignition fuses for con-
tinuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main and ignition fuses OK?
YES
NO
Replace the fuse(s).
IGNITION SYSTEM
EAS00739
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?
EAS00741
3. Spark plug
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
PLUGS" in chapter 3.
Standard spark plug
CR7E (NGK)
Spark plug gap
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
• Is the spark plug in good condition, is it of
the correct type, and is its gap within spec-
ification?
8 - 10
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
"CHECKING THE
YES
Re-gap or replace
the spark plug.
– +
NO
SPARK
NO