Your quite a guy to do this for a customer
The injectors are all powered from the 12 volt supply thru fusing.
Each injector's ground to operate it, is done individually in the PCM at the fire order sequence for the motor.
Your discription would be that of a PCM that is not switching the injectors.
Question is, is there spark at cranking?
If so, that leaves out the crank sensor as the source but does leave the cam position sensor because it controls injector timing.
At this point, a good tech needs to look at the system with a hi end scanner to determine where the failure is occurring.
Is it the harness, the cam sensor, the PCM etc.
Doing anything else is now guessing.
That's as close as I can get you to the logic of the problem.
I don't know what Tx means for the code. Need the P code number for me to interpet.