No throttle response 2002 camry - 1989 Toyota Camry

does the engine stay idling with no response to throttle movement? or does the engine cut-out when the throttle is pushed?

I typically remove them to clean but they can be cleaned on the car. Get throttle body cleaner from the store and spray all over. Manually open the butterfly valve and wipe after. I would take the idle air control vavle off to clean it.

Clean also the IAC (idle air control) or replace it

it is on the throttle body i would try to clean the throttle body first before replacing it

I would get the fuel pressure tested and/or computer test to get codes, sounds like low fuel pressure

i would not just go buy a tps on a guess
first check to see if you can bring the throttle up by hand at the motor where the throttle cable connects to the throttle body it may be a cable that broke

Was it idling before you changed the battery? If you were to clean out the throat of the aluminum inlet manifold just behind the throttle body with a parts cleaner product that is safe for plastics (sensors) the car will idle.
The engine features a intake valve cover vent that goes back into the front of the throttle body. After time, the vent tube deposits a lot of oil and gunk in the throttle body assembly and just behind it into the intake manifold.

When you replace battery in 2002 Camry ECM tries to reset to factory levels. The reason it will not idle is that the throttle body is dirty and ECM thinks it should be new!! Clean throttle body with cleaner that is safe for tbs and this will fix your idle problem.

throttle position sensor.

Most likely a failed "IAC"; Idle AIr Control valve; located on the side of the throttle body.