engine light on, tod light on

i just had my alarm and remote starter install today by a prof. tech, i dont know if i am lucky or not, my engine light and tod light when on, although i work for the biggest toyota dealship but still isuzu may be somthing new to my tech, i double checked with the alarm guy, i cannot think of anything may affect or tricker the engine light, so i ask other mechanic and the said Throttler Position Sensor open circuit, not working, suggest better to replace first and recheck, is there anyone got wiring diagram or idea how that would happen, please help me out, because Isuzu Dealer all closed down few years ago, that really sucks.

Sounds like they grounded something out somewhere - you can download the wiring diagram for free at www.tonemonday.com look for the the service CD dowload and follow the directions. Good luck with it!