Here's what the book says about the 2-2-3 code:

DTC 223/P0120: THROTTLE POSITION SENSOR SIGNAL TOO LOW

1) Throttle Position (TP) sensor signal is normally .5 - 4.2
volts. Opening throttle increases signal voltage. If TPS voltages are
not to specification, check voltage drop over signal ground and power
ground. See DTC 113: TCM FAULT. Repair as necessary. If voltage drop
and power ground are okay, go to next step.

2) Ensure ignition is off. Disconnect TCM and ECM modules.
Connect ohmmeter between TCM measuring unit terminal No. 20 and ECM
measuring unit terminal No. 50 (non-turbo) or No. 20 (turbo). If
ohmmeter reads about zero ohms, go to next step. If ohmmeter does not
read about zero ohms, check Green/Brown wire between TCM and ECM for
an open circuit.

3) Connect ohmmeter between TCM measuring unit terminals No.
50 and 20. If ohmmeter reads infinite resistance, go to next step. If
ohmmeter does not read infinite resistance, check Green/Brown wire
between TCM and ECM for a short circuit to ground.

4) Ensure ignition is off. Connect measuring unit to TCM.
Connect ECM control modules. Turn ignition on. Measure voltage between
measuring unit terminals No. 50 and 20. Press accelerator pedal. If
voltmeter reads about .5 volt for closed throttle, and about 4.2 volts
for wide open throttle, DTC was set due to poor terminal contact at
ECM connector or ground. If voltmeter does not read about .5 volt for
closed throttle, and about 4.2 volts for wide open throttle, check TP
sensor.


So if the wiring looks Ok (undamaged) its probably just a bad throttle position sensor.

Mike