Car stalled at the middle of the road. F8 20A fuse blown. Crappy Ford's user manual says: Powertrain control module. Brief and straight to the point.
After diagnosis it turned out the problem is on ECU Delphi DCM3.5 black connector line. Brown and grey connectors are OK. Test was very simple - 12V 40W lamp connected to F8 fuse contacts. When car door is opened, car activated and lamp glows, when door is shut, after a while PCM relay turns off the lamp. Something shorts F8 line when car is active. If you try ignition to crank car, lamp or fuse will burn.
Looks like sophisticated electrical problem? Almost all connectors were checked but lamp glows. Finally air filter was removed, headlight was removed and broken wires were found. Modern engineering at it's best. Weak protection against rubbing and stupid location. Looks like one wire broke, shorted and burned few other wires. Here is the lesson: do not mess with electronics before checking physical lines.
Very fortunate that this damage happened on low speed in the city. On highway such thing may be lethal. Overall Mondeo 4 is good car but engineering decisions on horn and ECU location, shitty wire isolation, absence of mechanical lock on passenger door, non-serviceable diodes in tail lights are annoying. Ave enshittification, morituri te salutant.
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