Correct. That's my understanding, so I don't think it is the immobilizer. Since it runs with starting fluid the issue seems to be fuel. I don't know how to interpret the 6V you measured on the injectors. If you are measuring the high side then I think it should be higher. If you are measuring the low (switched) side then I don't know how a multimeter wold interpret the PWM signal there. I think you would see a pulse. I would verify the fuel pump runs with the key on and measure the fuel pressure.

The security/ECU/immobilizer/fob/IR/chip issues in these cars are a nightmare however. Mostly they prevent the owner from using their own car. That is my experience anyway. Hopefully that is not your problem.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra