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Hm, on Toyota vehicles, all those "to main relay" lines go back to a single line that goes to the keyswitch. On yours, I'm guessing they don't enter the engine cabin again, but go over to your engine bay relay box. If you can track them back (and they go to a single wire) that would be a good place to interrupt all 4 at once. Otherwise, you could also put 4 relays in on the 4 lines that go to the injectors from the ECU (pins 25-28) and kill them all at once.
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