PIAGGIO 633823 Service Station Manual page 68

Electrical system
With MIU connector disconnected check the con-
tinuity between the Orange-White cable and pin 7
of the interface wiring .
Specific tooling
020481Y Control unit interface wiring
020331Y Digital multimeter
Virgin circuit
When the ignition system is not encrypted, any key will start the engine but limited to 2000 rpm. The
keys can only be recognised if the control unit has been programmed properly. The data storage pro-
cedure for a previously not programmed control unit provides for the recognition of the master as the
first key to be stored to memory: this becomes particularly important because it is the only key that
enables the control unit to be wiped clean and reprogrammed for the memorisation of the service keys.
The master and service keys must be used to code the system as follows:
- Insert the Master key, turn it to «ON» and keep this position for two seconds (lower and upper limits
1 to 3 seconds).
- Insert the service key and turn it to "ON" for 2 seconds.
- If you have copies of the key, repeat the operation with each key.
- Insert the MASTER key again and turn it to "ON" for 2 seconds.
The maximum time to change keys is 10 seconds.
During a single data storage sequence a maximum of 7 service keys are allowed.
It is essential to adhere to the times and the procedure. If you do not, start again from the beginning.
Once the system has been programmed, master key transponder, decoder and control unit are strictly
matched. With this link established, it is now possible to encode new service keys, in the event of losses,
replacements, etc. Each new programming deletes the previous one so, in order to add or eliminate
keys, you must repeat the procedure using all the keys you intend to keep using. If a service key should
become un-coded, the efficiency of the high voltage circuit shielding must be thoroughly inspected: In
any case it is advisable to use resistive spark plugs.
ELE SYS - 18
MP3 250 i.e.