A couple of years ago an Infiniti service technician showed me that he
could cut the fuel to any of my cylinders for testing purposes, with
his Infiniti diagnostic tool. He told me that all the ECUs from most
manufacturers have that feature.
My guess is a proprietary command through the OBD-2 bus. Has anyone
heard about that? What would the command be on a (made in North
America) Ford? With the PC-OBD-2 interface I'll be able to enter just
about any command. There is a chance that Ford would use a special
timing for that protocol, but if we're lucky, it's a simple
undocumented OBD-2-type command.