Yamaha YP125R, Service Manual

Page: 464 / 498

IMMOBILIZER SYSTEM
8-67
EAS27700
TROUBLESHOOTING
When the main switch is turned to “ON”, the immobilizer system indicator light does not come on nor
flashes.
NG
→
OK
↓
NG
→
OK
↓
NG
→
OK
↓
NG
→
OK
↓
EAS27720
SELF-DIAGNOSIS FAULT CODE INDICATION
When a system malfunction occurs, the fault code number is indicated in the LCD display of the meter
assembly and the immobilizer system indicator light flashes at the same time. The pattern of flashing
also shows the fault code.
1. Check the fuses.
(Main, ignition, ECU, and backup)
Refer to “CHECKING THE FUS-
ES” on page 8-77.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-78. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-73. Replace the main switch/immobilizer unit.
4. Check the entire immobilizer sys-
tem wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-61. Properly connect or repair the immobilizer
system wiring.
• Check the condition each of the im-
mobilizer system circuits.
• Refer to “SELF-DIAGNOSIS FAULT
CODE INDICATION” on page 8-67.
Fault
code
Part Symptom Cause Action
51 IMMOBILIZER
UNIT Code cannot be
transmitted be-
tween the key and
the immobilizer unit. 1. Radio wave interfer-
ence caused by ob-
jects around the keys
and antenna.
2. Immobilizer unit mal-
function.
3. Key malfunction.
1. Keep magnets,
metal objects,
and other immo-
bilizer system
keys away from
the keys and an-
tennas.
2. Replace the
main switch/im-
mobilizer unit.
3. Replace the key.