TPS: Bad Idle, High Idle, P0123 Code? We May Have a DIY Fix

[r.j-lo]

its ok, got it fixed. Really we didnt need that harness. Mine broke right at the connector so we could still fix it without having to extend the wire.

Glad its fixed.

[Eyeless0486]

Could this possibly be why my CEL came on after my MBC and WGA install?

[StRicTly4boosting]

check the code, if its 0234 or 1188 that is something else

[r.j-lo]

the mods wont have any affect on the p0123 code. Seems odd that it happens right after a mod or something though....

How is this for coincedence. This code was thrown right after we got off the dyno. A run or two earlier, S1 was installed. THEN, after talking with another local SRT about the problem (he had never heard of it or experienced it) he threw the code THAT NIGHT! Just pull your code and see what it is.

[StRicTly4boosting]

When my 0123 code went off, my car idle like crap and i was runnin 4 pounds because i wasnt getting full thortle..... the dealer fixed it in 15 mins

[hemidakota]

Quote: Originally Posted by r.j-lo

Same TPS problem with mine. Happened yesterday. I bought the TPs harness part 5013998AA but need to be clarified on the procedure. You are saying that I will NOT use the black connecter that came with the harness right? If, not, I just bought a bag of wires with connecters on the ends.

Can someone please explain.

If you lived closer, I may of helped you.

There is a small write up in the sticky portion how to solve this the right way.

[hemidakota]

Here is the latest engine harness 'AE' series. 2003 owners have the first edition called the 'AA'.




The white plug is the TPS Sensor connector

The Black larger plug on the same junction is the ECU module plug.

What is causing the problem on the earlier version is the left black striped wire that carries the voltage from the sensor to the ECU.

Picture of a complete harness:

[IWantAn04]

well after 15k miles mine began acting up 2 days ago...funny idle.."cruise control" ...and today p0123. So tonight i followed NIVO's how to on fixing this...bout an hour later she was good to go. No codes...normal idle...everything is great. Thats why i love srt forums.

[WhiteRob1984]

Could the TPS problem be causing my MOPAR BOV to blow off constantly under light acceleration, normally around 15 VAC? It just started doing it yesterday, and I already wiggled the pink wire off the BOV, but that didn't work. I also disconnected the battery to see if that would help by resetting the computer, still no luck.

If anyone knows why my MOPAR BOV keeps blowing off constantly, UNDER LIGHT STEADY ACCELERATION UNDER VAC, please let me know. Thanks!

Also, I ran a code search (turn the key 3 times, wait for codes), but nothing, just said DONE. Car doesn't idle heavy and I still hit 13-15 PSI falling to 11 PSI. Under WOT, the BOV works and sounds fine. It's only under light acceleration and between 20-10 VAC...

[hemidakota]

You may have a BOV Leakage.


Getting back to the TPS Problem:

1. Noticed the white sensor plug? That is the TPS Sensor that deals with the electronic throttle body adjustments. The orange one is the ECU connection. The upper black sensor is the IAC. These twio have something related that is the BLACK/BLUE striped 20-gauge wire.



2. (NOT FOR THE FAINT OF HEART) Taking the jacket apart to look inside the wire harness for that nasty connection, you will find several wires that anyone that is not electronic savy should attempt to correct. I have correct the the problem by cutting the BLACK/BLUE stripe wire and rerouting a BLUE 18-gauge back to the ECU plug. Not only that, I replaced the other two wires with an heavier gauge wire back to the original source.



3. Now alot of folks only talk about what is causing the problem and no one seen where and why this is occurring. Take a close look at the off center right where there is a plastic long cover that splcies those nice little 20-gauge BLACK-BLUE Stripe wires. Now you know why it fails. You only need to cut the source of the TPS BLACK wire and reroute it back to the ECU and splice it there (soldering it then covering with electrical tape or heat jacket).

[WhiteRob1984]

Quote: Originally Posted by hemidakota

You may have a BOV Leakage.

Ok, well I went out and wiggled the TPS white connector this morning and now no more excessive blow off. However, I did notice when I wiggled it the engine would hesitate and almost die then be fine. But neither before or after did my engine ever rev or idle really bad, only when I jiggled the TPS. Does this mean my TPS is bad? After wiggleing it, it did solve my excessive blow off problem, and I did notice my boost for a quick second only went to 9 PSI, but after a quick WOT again, it jumped back to 13-14 falling to about 11 PSI.

Does any of this mean my TPS is going bad? I went to dealership and told them I wanted my TPS sensor and wires replaced, and he said to come back Thursday at 8:00AM and they would take a look. Anyways, get back ya'll. Thanks!

[NIVO88T]

Have the dealer replace the wires going to the TPS.

[hemidakota]

Agreed with NIVO. Sorry, I am not at work where all the e-mail alerts are being sent. My work is shutdown since last weekend due to the heavy rain and flooding conditions.

Remember to have the dealership in replacing the wire harness and not to repair it. My dealership did that and again it failed. They used the same 20-gauge wire and with my heavy foot and constant engine moment only failed again.

[WhiteRob1984]

So why when I wiggled it, did it fix it? 3 days running now and no excessive blow-offs and still (never before as well) no heavy/bad idle. Could it maybe have just wiggled lose?

I called the local dealershipd here where I am staying on leave thanks to our good friend NeonDan. The guy was like, "TPS, hmmm, haven't heard of that, oh wait, well I have heard about it, but we are going to need the car all day to run some extensive tests to find the problem. We can't just order you a TPS sensor and wire set, we have to make sure that is the problem first." I told him when I wiggled it, the engines would hesistate and almost die, but it would still run fine. I also told him about the excessive blow-off, he just kept saying, "bring it in, we'll take a look at it." Those dreaded words...

Anyways, anyone have any comment on that or my problems? Later!

[hemidakota]

Then your problem is the junction connection point (plastic part where three of the same coded wire are spliced together) down the wire harness.

They need to replace the entire wire harness.