P2122 Throttle position switch error - FIXED

[Nathan2504]

P2122 Throttle Position Sensor D Circuit Low Input

Been having problems for a while with this and gradually getting worse, so today took some time to fix it. Plugged in a data logger and I could clearly see the signal from the pedal dropping when the issue is logged by the ECU. The monitor shows the Thottle pedal position is normally at ~19% while idling and rising to 80%+ when pressing the pedal. The datalogger showed an intermittent dropping down to 0% of "Pedal D" signal, this is what triggers error P2122 and puts the car into "Reduced Power" mode.

1. I removed the thottle pedal, which is held in with a single 10mm hex head bolt.
2. Reproduced error by gentally wiggling the circuit board contacts. Found top most one was only lightly touching hte board.
3. I cleaned my carbon tracks with some brake cleaner. Take care not to disturb the carbon-track runners, they are very delicate.
4. Applied addional contact pressure, by showing-it-who's-boss, between connectors and circuit board. (Other options would be to solder the contacts to the circuit board, but maybe this is overkill.)
5. Refitted and tried to recreate issue unsuccessfully - which is good news!

[RBH]

Nice write up and it's good to know that this can be done at home instead of getting ripped off at a dealers.

Well done

[RBH]

Made it a sticky so this may help others in future.

[Howy]

Good info.

[Lizard]

Now this is what we like, you've been here only a few days and what a contribution, we'll Done bud...

[lizzard-t]

Fantastic write up,
because there's atleast 2 members with this code and they say they have replaced that, but the fault is still there ,

[Frog87]

I have this very same problem, tried the above and was ok for a few days then back on again. Turn engine off power back but eml still on. Anyone replaced with a new part to solve or could it be a software issue?

[lizzard-t]

So you have P2122 code ?
have you scanned it since the repair to see if it's the same code ?
i know somewhere in 'this vault of knowledge I discribed to someone about diagnostic test to Carry out .to see if,its wiring , throttle end or ECM end .ill try dig it out for you .