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The ecu supplies the tps with 5volts. So your saying that you changed both the ecu and the tps, so they can't be the problem, and you have verified that both power and ground don't have high resistance? Unplug your tps and check for continuity between the 5v(supposed to be 5v anyway) reference and ground in the harness. Any continuity? Now check the 5v feed wire to signal wire. Any there? and finally check the signal wire for continuity to ground. You shouldn't see continuity on any of those. If you do, then you have a short in your wiring. Post your results.
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