the ETC relays can cause this problem also

ETC23 fault- Throttle sensor or wiring circuit is open or shorted. This malfunction occurs in the relation
between throttle position
sensors 1 and 2.
These sensors are internal to the TPS and are not servicable.

The most common issue causing this error is a broken wire at the TPS harness plug, usually finding the white/orange wire broken.
Also check the EGI relays in the relay box.

You can also try a TPS closed position learn
Turn ignition switch on and off
listen to the TPS and see if it is operating, you should hear it calibrate itself.
you can also try this learn proceedure
key on for 2 secs
key off for 10 secs
key on for 2 secs

this will calibrate the pedal position sensor also to the TPS