Question, what is this electric motor. If the code comes up as the TPS, would replacing the electric motor instead of throttle body fix the problem and stop the error code? Do you know this for sure?
I recently had a TPS replaced on my '99 LS 400 and I'll tell you what my mechanic told me, "TPS malfunction came up on the diagnostics, and this could be caused by one of three things: faulty wiring, a bad computer, or the TPS itself. Since Lexus seldom have wiring issues, and a bad computer would more than likely produce additional symptoms, chances are it's the TPS itself."
So it's more or less a crapshoot. He replaced the TPS and it fixed my problem.