Anyway, I think I have now emerged from the slight detour of trying to pair an ECU to an Immobiliser box.
Compared with reading and writing data to the Immobiliser box chip, this one is more like "open heart surgery" and I understand why the companies that do this professionally all have photos like this on their websites.
But after several hours of faffing about I finally managed to read the data off the processor, modify it back to "factory fresh mode" and write it back to the processor.
I hooked the ECU up to one of the "green label" immobiliser boxes I've been messing with, powered them both up with one of the key transponder chips I burned a couple of weeks ago, and the ECU is reporting "Engine start permitted".
So it looks to have successfuly "paired" with the Code box and the Code box recognised the key chip as valid.
I feel like I've earned a nice cup of tea and chocky biscuit.
Cheers,
Graham
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