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I assume you mean engine coolant temp sensor by ect? Unless it is a manual transmission, there is no such sensor on your truck, just the sending unit for the gauge which does not communicate with the PCM. And if it is a manual and you do have a coolant temp sensor I do not think it has an overtemp shutdown feature.
I asked your mechanic if he checked the high pressure oil system but he didn't answer. Hopefully the electrical expert he is sending it to can get some data from the PCM, it's pretty much a guessing game without that data.
2002 F350 4x4 Crew, coolant filter, 6.0 tranny cooler and ext. filter, pre pump mod & filter, Isspro pillar pod, EV-2 hpop & fuel pressure gauges, AIS, Marinco x2, door seal mod, netbook mount for AE.