Yamaha 2009 YZF-R1 (Y), Service Manual, Page: 505 / 546

IMMOBILIZER SYSTEM
8-114
EAS27721
SELF-DIAGNOSIS FAULT CODE INDICATION
When a system failure occurs, the error code number is indicated in the LCD display of meter and
the immobilizer system indicator light blinks at the same time. The pattern of blinking also shows the
error code.
Fault
code
Part Symptom Cause Action
51 IMMOBILIZER
UNIT Code cannot be
transmitted between
the key and immobi-
lizer unit. 1. Radio wave interfer-
ence caused by
objects around the
keys and antennas.
2. Immobilizer unit mal-
function.
3. Key malfunction.
1. Keep magnets,
metal objects,
and other immo-
bilizer system
keys away form
the keys and
antennas.
2. Replace the
main switch/
immobilizer unit.
3. Replace the key.
52 IMMOBILIZER
UNIT Codes between the
key and immobilizer
unit do not match. 1. Signal received from
other transponder
(failed to recognize
code after ten con-
secutive attempts).
2. Signal received from
unregistered stan-
dard key.
1. Place the immo-
bilizer unit at
least 50 mm
away from the
transponder of
other vehicles.
2. Register the
standard key.
53 IMMOBILIZER
UNIT Codes cannot be
transmitted between
the ECU and the
immobilizer unit. Noise interference or dis-
connected lead/cable.
1. Interference due to
radio wave noise.
2. Disconnected com-
munication harness.
3. Immobilizer unit mal-
function.
4. ECU malfunction.
1. Check the wire
harness and con-
nector.
2. Replace the
main switch/
immobilizer unit.
3. Replace the
ECU.
54 IMMOBILIZER
UNIT Codes transmitted
between the ECU
and the immobilizer
unit do not match. Noise interference or dis-
connected lead/cable.
1. Interference due to
radio wave noise.
2. Disconnected com-
munication harness.
3. Immobilizer unit mal-
function.
4. ECU failure.
(The ECU or immobi-
lizer unit was
replaced with a used
unit from another
vehicle.)
1. Register the
code re-register-
ing key.
2. Check the wire
harness and con-
nector.
3. Replace the
main switch/
immobilizer unit.
4. Replace the
ECU.