Hi Sam

Do you not have any Workshop Technical Data?

The information you want is on AutoVista from BluePrint (Vivid). It has the VESA system which shows you all the engine management components connected to the ECU and how to test

You can get a fully working trial for 28 days from the link below

http://www.blue-print.com/auto-vista/get-started/register.asp?promo=UKAT

For the cost per year it is surely a must have system

Peter