Yamaha 2004 YP400, Service Manual, Page: 19 / 417

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GEN
INFO
FEATURES
Self-diagnosis device
This model is equipped with a self-diagnosis
device for various electrical circuits.
If any of those circuits are defective, the multi-
function display will indicate a two-digit error
code (e.g., 12, 13, 14).
If the multifunction display indicates an error
code, note the code number, and then check
the vehicle. Refer to “FUEL INJECTION SYS-
TEM” in chapter 7.
CAUTION:
If the multifunction display indicates an
error code, the vehicle should be checked
as soon as possible in order to avoid
engine damage.
This model is also equipped with a self-diagno-
sis device for the immobilizer system.
If any of the immobilizer system circuits are
defective, the immobilizer system indicator
light will flash, and then the multifunction dis-
play will indicate a two-digit error code (e.g.,
51, 52, 53) when the key is turned to “ON”.
NOTE:
If the multifunction display indicates error code
52, this could be caused by transponder inter-
ference. If this error appears, try the following.
1. Use the code re-registering key to start the
engine.
NOTE:
Make sure there are no other immobilizer keys
close to the main switch, and do not keep
more than one immobilizer key on the same
key ring! Immobilizer system keys may cause
signal interference, which may prevent the
engine from starting.
2. If the engine starts, turn it off, and try start-
ing the engine with the standard keys.
3. If one or both of the standard keys do not
start the engine, re-register the standard
keys.
If the multifunction display indicates an error
code, note the code number, and then check
the vehicle. Refer to “IMMOBILIZER SYSTEM”
in chapter 8.