The 12v to the injectors happened after you tried starting the car? Can you hear them clicking when you try to start it?
Tps is mostly a variable resistor and will send a value based on where the throttle is located. So not finding 12v is ok, measuring the resistance might be a better option for this. Unless your measuring directly from the plug, in which case could be a variety of voltages 5v 12v
I'm going to recommend trying to fix, then clear, those codes. Check your service manual for all the grounds and make sure tehy are clean and tightly fastened
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