Troubleshooting - Yamaha 2004 YP400 Service Manual

EAS00794

TROUBLESHOOTING

When the main switch is turned "ON",
the immobilizer system indicator light
does not come on or flash.
Check:
1. main, ignition, and backup fuses
2. battery
3. main switch
4. wiring connections
(of the entire immobilizer system)
NOTE:
• Before troubleshooting, remove the following
part(s):
1. front cowling
2. upper rear cover
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112, YU-03112-C
EAS00738
1. Main, ignition and backup fuses
• Check the main, ignition and backup fuses
for continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main, ignition and backup fuses
OK?
YES
IMMOBILIZER SYSTEM
NO
Replace the fuse(s).
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?
EAS00749
3. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
EAS00787
4. Wiring
• Check the entire immobilizer system wir-
ing.
Refer to "CIRCUIT DIAGRAM".
• Is the immobilizer system wiring properly
connected and without defects?
Check the condition
of each of the immo-
bilizer system
cuits.
Refer to "CHECK-
ING THE IMMOBI-
LIZER SYSTEM".
8 - 56
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
YES
Replace the
switch/immobilizer
unit.
YES
Properly connect or
repair the immobilizer
cir- system wiring.
– +
NO
NO
main
NO