I have a box full of ECU's at home, 2 which I have paid for & one which was replaced under warranty back in 2006.
The problem is I am still working on a way to reprogram the immoblizer to an old ECU. Once I can do that then I will be able to test what has gone wrong with your XT ECU.
I belong to this forum with these guys doing some great hacks.
http://www.activeboard.com/forum.spark?forumID=99460&p=1
The guys have been working on the MT01 at the moment.
http://www.activeboard.com/forum.spark?aBID=99460&p=3&topicID=23998458&page=1
I am waiting for one of these at the moment.
Yamaha immobilizer emulator.
The emulator of an immobilizer for motorcycles and scooters Yamaha.
Works with all motorcycles and scooters Yamaha from 2006 to 2009.
Does not demand programmingonly need is connect wires.
Completely emulates work of a regular immobilizer, including light-emitting diode work on the instrument panel.
For emulator installation in the case of a regular immobilizer:
1. Remove glue hermetic from the immobilizer case.
2. Take out a PCB from immobilizer and desolder from it wires.
3. Connect the emulator according to drawing more low.
4. Insert the emulator into the immobilizer case.
Colouring of wires and their appointment:
Black (2 pcs.) GND
Red with a green strip BATT (+12v)
Red with a white strip IGN (+12v)
Blue LED (+5v)
Yellow with a blue strip K-line Immo-ECU