1994 Lexus ES 300 p1609 scan code

i have a lexus es 300 1994 , i changed the ecm and tps sensor i never got it flashed toyota said it didnt need to be flashed the ecm of course, so now i start the car it starts fine but when i go to press the gas it bogs down it does not respond it wants to turn off, engine light is on i scaned the car with a scan tool obd ll , and got code p1609 auxiliary input/ output, sometime when it bogs down i cannot scan the car it will show messege connection error,, but sometimes car will work fine, let me know what u think thank you