Attention. any 2001 100 series owners with a scan gauge 2?

[2000UZJ]

To answer an earlier question I am idling at 600 hot and in gear.

I am considering a trail spare throttle body, but it would need to act up again before I could justify the expense.

I idle at 600-750RPM as well. I don't think you have a problem, you are just realizing everything runs much different now that you have a SG and can see that data.

 

[2001LC]

Throttle Control Motor & Throttle Position Sensor 2UZ-FE diagram

OK, I read you're mega post and I think I'm more or less up to speed.

One thing that I've seen that not everyone agrees with me on is that all of the swapping of TPS and APPS sensors is really chasing a symptom and not always a cause. The throttle plate as you know is motor driven. The drive includes a motor, clutch, and gear train. The gear train may or may not be well sealed at the throttle plate shaft so the gearing and grease may be contaminated over time. Cleaning the TB may get solvents into the gear train that might free it up for awhile as it works away at the grease. Long story short, I think a lot of the TPS/APPS codes are rooted in failure or stick in this gear train that really can't be accessed or serviced.
***************, YMMV

This Construction Throttle Control Motor & Throttle Position Sensor 2UZ-FE Engine may be useful: