Gilera 633721 Workshop Manual page 247

Nexus 500 euro 3
5 - Replace the decoder. Connect the battery. Repeat the programming. YES go to 7 NO go to 6
6 - Disconnect the battery, replace the control unit, connect the battery. Repeat the programming.
7 - The system is OK
Code 2
A 2-flash code indicates a system where the de-
coder does not recognise the transponder signal.
This might depend on the inefficiency of the im-
mobiliser aerial or the transponder.
Turn the switch to ON using several keys: if the
code is repeated even with the Master key, check
the aerial wiring and change it if necessary. Oth-
erwise replace the faulty key and/or reprogram the
decoder. If the problem persists, replace the de-
coder.
Code 3
The 3-flash code indicates a system where the de-
coder does not recognise the key. Turn the switch
to ON using several keys: If the error code is re-
peated even with the Master key, replace the de-
coder. If this is not the case, reprogram the
decoder.
Tachometer
Electric characteristic
TERMINAL: 7 - 12
CONDITIONS : Start-up speed
STANDARD: approx. 0.8 - 4.5 V
Injection
INJEC - 247