Yamaha MT-01 T 2005 Service Manual page 397

Fault
Part
code
52 IMMOBILIZER
UNIT
53 IMMOBILIZER
UNIT
54 IMMOBILIZER
UNIT
55 IMMOBILIZER
UNIT
56 ECU
Immobilizer system indicator light fault code indication
Units of 10: Cycles of on for 1 second and off for 1.5 seconds.
Units of 1: Cycles of on for 0.5 second and off for 0.5 second.
Symptom
Codes between the
key and immobilizer
unit do not match.
Codes cannot be
transmitted between
the ECU and the
immobilizer unit.
Codes transmitted
between the ECU
and the immobilizer
unit do not match.
Key code
registration
malfunction.
Unidentified code is
received.
7-82
IMMOBILIZER SYSTEM
Cause
1. Signal received from
other transponder
(failed to recognize
code after ten
consecutive
attempts).
2. Signal received from
unregistered
standard key.
Noise interference or
disconnected
lead/cable.
1. Interference due to
radio wave noise.
2. Disconnected
communication
harness.
3. Immobilizer unit
malfunction.
4. ECU malfunction.
Noise interference or
disconnected
lead/cable.
1. Interference due to
radio wave noise.
2. Disconnected
communication
harness.
3. Immobilizer unit
malfunction.
4. ECU failure.
(The ECU or
immobilizer unit was
replaced with a used
unit from another
vehicle.)
Same standard key was
attempted to be
registered two
consecutive times.
Noise interference or
disconnected
lead/cable.
Action
1. Place the
immobilizer unit
at least 50 mm
away from the
transponder of
other vehicles.
2. Register the
standard key.
1. Check the wire
harness and
connector.
2. Replace the
main switch/im-
mobilizer unit.
3. Replace the
ECU.
1. Register the
code re-
registering key.
2. Check the wire
harness and
connector.
3. Replace the
main switch/im-
mobilizer unit.
4. Replace the
ECU.
Register another
standard key.
1. Check the wire
harness and
connector.
2. Replace the
main switch/im-
mobilizer unit.
3. Replace the
ECU.