Question about 2003 Ducati 999
Immobilizer and transponder
The Immobilizer allows the vehicle to be started only if the rider uses the special ignition key which sends the identification code to a decoder fitted into the instrument panel. The emitting - receiving system is made of a "TRANSPONDER" fitted into the ignition key heads and an antenna close to the ignition lock.
The two keys contain the secret master code for programming the immobilizer system and allowing engine start is stored into this key;
Transponder is included into the key head and consists of a power supply circuit, a ROM (Read-Only Memory) and a transmission circuit. The Transponder is power supplied through the magnetic field generated by the antenna which is enabled as soon as the instrument panel is switched on. As it is very compact and needs no outer power supply through a battery, it is directly fitted into the key head.
Circuits into the key head are not shockproof.
The antenna consists of a plastic-coated copper coil connected to wires ending up with a connector.
The antenna (A) is fitted onto the ignition lock into its specially designed seat.
Operating principle of the immobilizer
When the ignition key is positioned to ON, the decoder into the instrument panel energises the antenna, which generates an electromagnetic field power-supplying the key transponder. The Transponder sends the code stored into its ROM, which is received by the antenna and sent to the decoder. Here the secret code is matched with a second code. If this comparison proves successful, engine starting is enabled.
Immobilizer warning lights and indications
When the ignition key is turned to OFF, the immobilizer inhibits engine operation. When the ignition key is turned back to ON to start the engine, the following happens:
1) if the code is recognised, the immobilizer enables engine starting. Press the START button (2), to start the engine;
2) if the diagnostic light (8) comes on and the page with the message "Error IMMO" is displayed when you press button (1) in position B "t", it means that the code was not recognised. When this is the case, turn the ignition key back to OFF and then to ON again. If the engine still does not start, try with the other black key. If the other key does not work out either, contact the DUCATI Service network.
When programming the immobilizer as described below, use only the required key and keep the other keys away otherwise they might interfere.
Removing the immobilizer
Turn the ignition switch to OFF.
Disconnect Immobilizer antenna connector (21).
Reference (21) is the same that is indicated in the diagrams under "Arrangement of wiring on frame", Sect. P 1.
Remove the immobilizer antenna wire ties.
Loosen screws (1) securing Immobilizer antenna protection to ignition switch.
Remove the cover (2) and the Immobilizer antenna (3) clear of the key-operated switch.
Refitting the immobilizer
Apply a drop of Loctite inside cover (2).
Locate antenna (3) to cover (2), and secure it in place with the two pegs (A) of the cover.
Fit the cover on the key-operated switch, easing the antenna wire downwards.
Tighten the cover starting screws (1) in their thread.
Tighten the screws to the specified torque (Sect. C 3, Frame torque settings).
Posted on Apr 05, 2015
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Posted on Jan 02, 2017
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