"As for chasing a short, I have the older shop manuals with wiring diagrams, but not a 2003. Is there reference material you would recommend?"
I have an '03 and was able, with some patient analysis, to utilize the wiring diagrams in the Bentley manual for the 2001 year to isolate and trace a P0343 code, which is the same "cam position sensor, short to B+, above limit" except for Bank 1, that you have for Bank 2 (P0348)
Although not exactly the same for year '03, the diagrams from '01 are close enough that by identifying the wire colors involved in the circuit to the DME, I was able to figure out that my short was due to the Cam Sensor itself being faulty.
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