It's supposed to be 0V when the injector is closed, and it's supposed to see something like 9V to open. See if you can find a link to contact Brad Anders on his webpage; I know that he has looked at the voltage that is produced by the ECU to open up the injectors.
Note that the power is not connected unless the ECU is trying to open an injector, and that's when you'll see voltage.
Ah, this page has a section about injector voltage:
The ECU
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... the effective supply voltage to the injectors is 12.7 V through a 6 ohm load resistor (Rload, a 5 W ceramic power resistor, bonded to the case of the ECU to act as a heat sink).
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Quote:
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Accounting for the higher measured injector resistance over the specification value and using the system voltage of 13. 6 V, the actual measured sustained voltage is 4 to 5 V. Note that the calculated drive voltage corresponds exactly with data given for the flow rates of the injectors, which states that the tests were performed at 3 V (data courtesy of Roland Kunz).
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So the voltage across the injectors varies quite a bit, but it looks like if you unplug them you should see 12V for at least a little bit.
--DD