I have reproduced a PDF document attributed to Gene Thompson about the Rover 4CU Electronic Control Unit here (410kb)

A few of words of caution regarding its origin which seems to lean towards cars intended for the US market.

I have not checked it for authenticity or accuracy but it has clearly been prepared by a knowledgable engineer.

Although it refers to Rover SD1 it also includes information regarding Lambda control and other features which would not apply to Rover SD1's sold into the British market.

In other respects It seems to be a relevant and well prepared document and could be used as a source of valuable information for anyone familiar with the electronic features involved.