Ron,

I just looked at the wiring diagram and I see what you're saying about the injector wiring. The way they drew the earth ground symbol in there is kinda weird and easily mistaken. I too was always under the impression that the injectors were wired to provide constant voltage to one pin and that the controller provided the once-per-cycle grounding (of variable duration, influenced by temperature, manifold vacuum, etc, etc.) of the other pin. I believe that on the newer model systems, like our V70 and S80, the controller DOES provide the grounding path.

I'll revisit all my cleaning/testing/head scratching again and figure this thing out!
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the ignition - now back to the brakes again)