P1122 / P1128 Diagnostic Procedure Help

Have a 2003 Sentra with 1.8L that is throwing codes P1122 and P1128. The Eletric Throttle Control has already been replaced and have done the re-learn procedure several times but continue to have problem with car losing power (no throttle response) and giving the above codes.
Does anyone know the correct diagnostic procedure for this car and motor combination, all I can find is info for Atlimas or 2.5L.
Also have gotten the P0507 code.