Can't erase trouble codes.

[Elvecino]

I am new to the site and hope that someone has any ideas. I recently got a SES light and had it checked at a parts store. Codes retrieved were, P0122 (TPS circuit low input) and P0340 (Camshaft position sensor"A" bank 1 circuit malfunction).I tested the camshaft sensor and had no voltage signal,so I replaced it. I backprobed the TPS and it was fine( KOEO Ref. volts=4.67, Closed throttle= .99, WOT=4.65, A steady opening of the TB gave a steady rise in voltage with no fluctuating.) After connecting the negative cable i turned it on and no SES. Three starts later it shows up again with code P0122. I tried a diagnostic tool and removed the code. Started it up, SES come up again. Same code. I disconnected the battery and reconnected after a couple of hours. SES comes up again.Truck is running a little rough due to disconnection of battery, but if it eventually runs well I might not pay attention to the SES. Anyone have some ideas as to what may cause this or just not worry about it? 2003 Supercrew, 4.6L Windsor, Automatic, 72,600 miles

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[projectSHO89]

The code keeps coming back because you haven't fixed the underlying problem.

Get the fault code and follow the factory diagnostic to identify and repair the fault.

[Elvecino]

Thank you for replying. I figured as such that it could be somewhere between the TPS and PCM. Will try to hunt down the problem. Thought maybe someone had the same problem and knew of a reference point. Thanks for the link to owner's manual, coincidently I lost mine somewhere.