Self-Diagnosis Malfunction Codes - Yamaha 2004 YP400 Service Manual

SELF-DIAGNOSIS MALFUNCTION CODES

When a system malfunction occurs, the malfunction code number is displayed on the LCD display
of the meter assembly and is indicated by the immobilizer system indicator light flash patterns.
Malfunction
Part
code
Immobilizer unit
51
Immobilizer unit
52
Immobilizer unit
53
Immobilizer unit
54
Immobilizer unit
55
ECU
56
IMMOBILIZER SYSTEM
Symptom
Code cannot be transmitted
between the key and immo-
bilizer unit.
Codes transmitted between
the key and immobilizer unit
do not match.
Code cannot be transmitted
between the ECU and
immobilizer unit.
Codes transmitted between
ECU and immobilizer unit
do not match.
Key code registration mal-
function
Unidentified code is
received.
8 - 54
Cause
1) Radio wave interference
caused by objects around the
keys and antennas.
2) Immobilizer unit malfunction
3) Key malfunction
1) Signal received from other
transponder (failed to recog-
nize code after ten consecu-
tive attempts).
2) Signal received from unregis-
tered standard key.
Noise interference or discon-
nected lead/cable.
1) Interference due to radio wave
noise.
2) Disconnected communication
harness.
3) Immobilizer unit malfunction
4) ECU malfunction
Noise interference or discon-
nected lead/cable.
1) Interference due to radio wave
noise.
2) Disconnected communication
harness.
3) Immobilizer unit malfunction
4) ECU malfunction
(The ECU or immobilizer unit
has been replaced with a used
unit from another scooter.)
Same standard key was
attempted to be registered two
consecutive times.
Noise interference or discon-
nected lead/cable.
1) Interference due to radio wave
noise.
2) Disconnected communication
harness.
3) Immobilizer unit malfunction
4) ECU malfunction
– +
ELEC
Action
1) Keep magnets, metal
objects, and other
immobilizer system
keys away from the
keys and antennas.
2) Replace the main
switch/immobilizer unit.
3) Replace the key.
1) Place the immobilizer
unit at least 50 mm
away from the transpon-
der of other scooters.
2) Register the standard
key.
1) Check the wire harness
and connector.
2) Replace the main
switch/immobilizer unit.
3) Replace the ECU.
1) Register the code re-
registering key.
2) Check the wire harness
and connector.
3) Replace the main
switch/immobilizer unit.
4) Replace the ECU.
Register a new standard
key.
1) Check the wire harness
and connector.
2) Replace the main
switch/immobilizer unit.
3) Replace the ECU.