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ELEC
IMMOBILIZER SYSTEM
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
code
Part
Symptom
Cause
Action
51
Immobilizer unit
Code cannot be transmitted
between the key and immo-
bilizer unit.
1) Radio wave interference
caused by objects around the
keys and antennas.
2) Immobilizer unit malfunction
3) Key malfunction
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.
52
Immobilizer unit
Codes transmitted between
the key and immobilizer unit
do not match.
1) Signal received from other
transponder (failed to recog-
nize code after ten consecu-
tive attempts).
2) Signal received from unregis-
tered standard key.
1) Place the immobilizer
unit at least 50 mm
away from the transpon-
der of other scooters.
2) Register the standard
key.
53
Immobilizer unit
Code cannot be transmitted
between the ECU and
immobilizer unit.
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
1) Check the wire harness
and connector.
2) Replace the main
switch/immobilizer unit.
3) Replace the ECU.
54
Immobilizer unit
Codes transmitted between
ECU and immobilizer unit
do not match.
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.)
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.
55
Immobilizer unit
Key code registration mal-
function
Same standard key was
attempted to be registered two
consecutive times.
Register a new standard
key.
56
ECU
Unidentified code is
received.
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
1) Check the wire harness
and connector.
2) Replace the main
switch/immobilizer unit.
3) Replace the ECU.
Summary of Contents for 2004 YP400
Page 1: ...2004 YP400 S 5RU1 AE1 SERVICE MANUAL ...
Page 2: ......
Page 8: ......
Page 9: ...GEN INFO 1 ...
Page 11: ...GEN INFO ...
Page 28: ...SPEC 2 ...
Page 30: ...SPEC ...
Page 77: ...CHK ADJ 3 ...
Page 137: ......
Page 138: ...CHAS 4 ...
Page 210: ......
Page 211: ...ENG 5 ...
Page 286: ...COOL 6 ...
Page 288: ...COOL ...
Page 299: ...FI 7 ...
Page 301: ...FI ...
Page 342: ...ELEC 8 ...
Page 378: ...8 34 ELEC LIGHTING SYSTEM ...
Page 404: ......
Page 405: ...TRBL SHTG 9 ...
Page 415: ......
Page 416: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN ...