I plan on running Zetec 2.0 with the standard engine loom and stock engine management. On various forums the Ford EEC-IV is complimented as being smart enough to be useful and practical, but simple enough not to cause too much trouble.
As it's been a bit too cold to spend time in the workshop, I've been spending time sorting out the looms I have in the warmth of my home. Broke a Mondeo and a Sierra loom for wires and plugs, also tracked down each wire and plug within the Mondeo Zetec harness. Now I have spreadsheet of the ECU pinout with colours and functions, and a tag on each wire coming into the three oval plugs that connect the engine loom to the body loom:
https://fridge.pov.lt/~alga/zetec/Mondeo-ECU-pinout.pdf
(
editable spreadsheet version)
My engine management has the coil drivers built into the ECU, systems with EDIS-4 might have slight differences in the ignition wiring.
To summarize, you just need to feed battery positive, main power positive, ignition positive, and battery negative in order to run the engine with the stock ECU. The rest of the wires coming out of the engine loom are various senders and non-essential sensors and outputs. There isn't even a check engine light coming out of that ECU!
Removing EGR, pulse air and canister purge relays/sensors from the system might upset the ECU (codes will be visible in the self test), but they should not throw it into limp mode. If they cause any problems, they can be stubbed with appropriate resistors.
If you decide to go this route, I recommend getting the Haynes manual for the engine donor. The Mondeo's Haynes wiring diagrams are much easier to read than Sierra's, as they have all the numbered components listed on the same page.
If you don't want to buy a paper version, for Mondeo, usually googling for 1923-12.PDF will do the trick!
Speaking of wiring, the injector/CMP/temp sensor subharness was completely Kaput on my engine. Out of 12 wires in that subharness there wasn't a single one with isolation fully intact. I suspect the engine wiring was the main reason why the Mondeo was broken:
The main part of the engine harness is in a pretty good shape. Only the crank angle sensor wires and the EGR valve plug wires are damaged. EGR will be deleted anyway, and the CKP plug I replaced.
I found out that the square plugs used for injectors and most sensors on the Zetec are of the Tyco/AMP Junior Power Timer series. Getting replacement crimped contacts for them will not be much problem.
But I've still no clue what the oval 12-point plug is called. In the worst case I'll solder the wires to the old contacts.