Pin 3 to pin 19 grey/orange -- Pats TX signal.
Pin 4 to pin 53 white/green -- Pats RX signal.
Pin 2 is the earth, to chassis.
Pin 1 is a switched 12v.
All four wires will need extending from the harness plug up to the steering column.
Fuel pump relay.
The Ecu, both controls and monitors the fuel pump via a relay.
There are two pins from the ecu plug.
Pin 54 (black/blue) from ecu plug, Fuel pump relay control switched earth.
Pin 40 (violet/black) from ecu plug, fuel pump monitor.
Starter motor inhibitor relay. This stops the engine from cranking as part of the immobilizer.
Pin 27 (black/yellow) ecu plug -- starter motor relay control (switched earth).
Hope this helps any one wanting to run a zetec without spending shed loads. Its no harder than making a loom for a MS ecu. There is no mapping and the ecu can be had for a few quid.
ps it would be nice if it was made a sticky.