So today, my handy scantool told me this:

On-Board Diagnostics Codes Read-2
P0122 - Throttle/PedalPosition Sensor/Switch A circuit ow Input

Anyone know what could cause this? I'm Vortech AP2, all stock other than that, and recently replaced .. a lot of stuff (plugs, black box, connections, vaccuum lines).

Thanks

 

You have introduced a lot of new variables into your system. It could be almost anything that caused this to happen. You should begin by backtracking through the known "stuff" you've already done.

If you were stock, it can be a number of things that need to be tested and eliminated.
1. It could be temporary and no repairs needed.
2. It could be necessary to replace the throttle body.
3. It could be a short in the wire between the ECM (C27) and the TPS.
4. It could be a break in the wire between the ECM (C28) and the TPS.
5. It could be a bad ECM.

 

Wow, that's a lot to cover.

I was kinda hoping that your #3 or #4 would be especially suspect because the Vortech black box feeds into them, which would make the connections suspect, but I guess I'm not in luck there. I reviewed the wires I tapped in to and it doesn't look like it uses TPS for anything. Crap.


Now, I'm going to check voltage because that makes sense. I think it's suppose to be like 1.5 to 4.5 or so (I'll double-check those #'s first).

Oh, and sviper, thanks for your response the other day. I changed the plugs and the high rpm power issue I had dissolved, but the lower rpm, partial throttle, sputtering is still there. Maybe related?

 

5V between pin 1 and 3 on the 3P connector on the TPS.
On the sensor side, 0.5 ohm to 0.9 ohm between pin 1 and 2. And 4.5 ohm between pin 2 and 3 with throttle fully closed.
Measure V between ECM connector C18 and C27. Should get 0.3V fully closed and 4.5V fully open
Measure V between ECM C18 and C28. Should get 5V.

Your low rpm sputter can also be several causes. MAP sensor can be one of them. Make sure the MAP sensor connection is "fresh" and solid. Reset ECU.