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The diagram I get it slightly different and actually shows that although on different pins, the +ve is actually common to each bank: Terminal 15 is the power supply while Terminal 31 is the ground (you see those as the termination of each side of the diagram).
The attachment shows that the circuitry for the +ve (which terminates in Terminal 15 is common to each bank) while the -ve (which terminates in Terminal 31 is independent to each cylinder).
May not help directly, but should clarify as to why the same event (corrosion) could lead to different codes that are either injector specific (if on the -ve) or bank specific (if on the +ve).
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