Originally Posted by
tighed1
Fuel relay will only be on for 2 seconds prior to the car starting. That's why you read no voltage.
Manually close the engine relay then see if she starts.
BTW I've refurbished many RCMs from your side of the pond. 
So today I had some brief time to check again.
When the key is turned right to on (not to ignition, as that needs a 2nd person, but when I do this only Traction Control relay closes )
and I press the engine relay, the fuel pump relay closes as well, I heard some pumping but no cranking or ignition.
I did check the relay, it closes on 12 vdc applied to the coil. The relay coil connects fine to Connector E2 and D2 "FUSED IGNITION SWITCH OUTPUT" (FISO) via a diode that measures 0.560 VDC fwd voltage and to B5 GROUND.
I tried to refresh the battery because voltage seemed low, some 12.2 VDC and afterwards 12.8 VDC.
I am guessing the FISO doesn't come directly from the dash Ign. Switch but from the ECU?
What more can I check? Any more parameters that need to be fulfilled before Ign. really asserts FISO?