With the ECU plugged in and key on, it's getting 12V and ground. An internal voltage regulator knocks down the 12V to 5V and outputs that on pin 26. backprobe the connector from pin 26 to either 47 or even pin 60 and you hopefully will see 5V.
If you do, it's a wiring issue. That's when you can uplug the ECU and start testing for continituty to see if the wire from pin 26 connects all the way to the 10-pin connectors and to the 60-pin.
TBH i would roll the dice, disassemble the 10-pins and clean then very well and then test for 5V (key on, ECU in) at the TPS sensor. You might get lucky because the 10-pins are a known connection issue.
If you do, it's a wiring issue. That's when you can uplug the ECU and start testing for continituty to see if the wire from pin 26 connects all the way to the 10-pin connectors and to the 60-pin.
TBH i would roll the dice, disassemble the 10-pins and clean then very well and then test for 5V (key on, ECU in) at the TPS sensor. You might get lucky because the 10-pins are a known connection issue.