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Can't you find an exposed bit of the connector to test with a voltmeter?
Do the wires all come from the ECU? I think I recall that in the MPFI that my car had the hot wires actually came from a relay and not from the ECU at all. (I could be confusing it with a different car, though.)
A wiring diagram would be a big help, too. Do you have access to one?
-soD
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