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The injector gets full time positive power from the ignition key on circuit. The PCM pulses the ground. You could have a short to ground on the injector pulse circuit, or the most likely thing is the injector driver in the PCM is bad. If you have the fuel rail unbolted and pulled up where you can see the injectors, as I expect you probably do, disconnect the PCM, and turn the key on. If the injector does not spray out, then the PCM is the issue. if the injector sprays with the PCM detached,then there may be a short to ground in the wire harness.

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