The first thing I'd check are the fuses/relays.

Are you getting a voltage at the injector harness? If I'm not mistaken, the computer
will complete the ground connection by pulsing an internal SSR (relay).

With the key on, there should be a voltage at the injector harness.

The IAT from my knowledge will not prevent the injectors from pulsing, but it will result
in a hard start condition, and possible air/fuel ratio error.