2001 Dodge Caravan

It may be internal. You can try opening it up, but if you replaced the fuses could the problem caused a secondary problem, is the O2 system or plugs fouling? Running rough? Then fine. You clear it with the DRBIII? The Pcm's did have some problems in 02. Call Dodge parts or service and see if the part supercedes. Is the MAP vacuum ok? The running rough may be throwing the code. Is there a large vacuum leak that comes on as the valve timing is losing tightness. A loss in vacuum richens it even if the TPS is not opening so that would throw all 3 codes eventually if it was running long when it came in. I used to put a rag and pliers and squeeze either side of the fuel system to see the change. Mileage is important for reasons of wear.

You spoke of 3 shorted wires. If any were the 5 volt common circuit to the PCM then the PCM HAD A 5 VOLT SHORT TO GROUND. It used to be a purple and white wire, small, 20 guage. So you shut it off, the start circuit fuels it, then the PCM map and throttle logic are screwed up from that short. I would stop, tell the customer that internally the computer was shorted. No schematic for inside of PCM. If vacuum of manifold is good, and fuel pressure. The two sensors share the same 5 volt feed and the same reference signal circuit. So if you get 5 volts at each of the sensors and continuity to the PCM from each sensor ref. Signal wire, the only circuit left are the two left over, feeding it's different reference signals, and if they are good from map and tps to pcm, you cannot go any further until you have replaced the powertrain control module. A SHORT BLOWS FUSE, BURNS WIRE, OR SHORTS COMPUTER TO GROUND, and turns on circuits it shouldn't, like the dome lamp shorting.
OK Mr. Framingham, those have common 5 volt wire, ref. Wire, but different inputs only. I love these shorts, I hate other problems though. I've been with Chrysler for a really long time. Just want to help you with this nightmare short. This site has the schematics for this also, ok