Throttle Position Sensor replaced, but code keeps popping up - JeepForum.com

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post #1 of 47 Old 07-09-2010, 08:28 PM Thread Starter
gatesjeff33
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Throttle Position Sensor replaced, but code keeps popping up

I have replaced my throttle position sensor twice on my 2002 Jeep Wrangler Sahara 4.0L, once with a value TPS and then again with an expensive one. The code keeps coming back and the jeep continues to run funny. Do I have a problem with my wiring? If so how do I trouble shoot it?

The code is P0123, which is a high voltage detected on the TPS.

Thanks!

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post #2 of 47 Old 07-09-2010, 09:15 PM
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Did you calibrate the TPS?
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post #3 of 47 Old 07-09-2010, 09:43 PM Thread Starter
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No I did not calibrate the TPS... What do I need to do to do that?
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post #4 of 47 Old 07-09-2010, 10:08 PM
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Did you calibrate the TPS?


You have to calibrate them?
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post #5 of 47 Old 07-09-2010, 10:12 PM
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No I did not calibrate the TPS... What do I need to do to do that?
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You have to calibrate them?
Yeah I didn't realize that either. So when I replaced it, and my Jeeps was working fine for two week until it started acting up again, I was very confused. Talked to my local shop, and apparently you have to calibrate it. So I had the shop calibrate it, I'm not exactly sure how they did it. However, the FSM did not say a thing about this.....

Needless to say I got frustrated haha.
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post #6 of 47 Old 07-09-2010, 10:40 PM
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Originally Posted by gatesjeff33 View Post
I have replaced my throttle position sensor twice on my 2002 Jeep Wrangler Sahara 4.0L, once with a value TPS and then again with an expensive one. The code keeps coming back and the jeep continues to run funny. Do I have a problem with my wiring? If so how do I trouble shoot it?

The code is P0123, which is a high voltage detected on the TPS.

Thanks!
Is your horn and cruise control (if equipped) working? Airbag light on? The feed for TPS goes through the clockspring, so it can cause that error code too. May not be your issue but worth a check

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post #7 of 47 Old 07-09-2010, 10:58 PM
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I've never heard of manually calibrating the TPS. The only thing you should have to do - to my knowledge - is to make sure that the throttle shaft intersects the TPS connection in the proper orientation. It's a simple plug-in connection, and it should be self-calibrating through the PCM.

When you replace the sensor and you still have a code, you may very well have a problem in the connector itself, or in the wiring leading up to the connector...which is why you check/replace those areas first before you replace a sensor that's actually working. If you get the P0121 code along with it the P0123 at any time, it's a bad ground, likely.

If it's worth doing, then it's worth overdoing.

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post #8 of 47 Old 07-09-2010, 11:30 PM
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Did you calibrate the TPS?
Horse Manure!
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post #9 of 47 Old 07-09-2010, 11:39 PM
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Horse Manure!
That's what I thought (think) too!

I installed it per the FSM. The throttle shaft was oriented how it told me to, but it somehow slipped off, and got on the other side. That mgith be my fault, might not be my fault. When the throttle started acting up again, I didn't think anything was wrong with the TPS, so I took it to my local shop. They said it wasn't calibrated correctly. I suppose it could be BS, but my throttle works fine right now, thats all I care about haha...
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post #10 of 47 Old 07-10-2010, 08:42 AM
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They said it wasn't calibrated correctly. I suppose it could be BS, but my throttle works fine right now, thats all I care about haha...
How much did they charge you for that?

If it's worth doing, then it's worth overdoing.

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post #11 of 47 Old 07-10-2010, 12:05 PM
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How much did they charge you for that?
Too much I guess I never trusted myself messing with the engine, or diagnostics.
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post #12 of 47 Old 07-10-2010, 12:24 PM
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post #13 of 47 Old 07-10-2010, 12:42 PM
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Too much I guess I never trusted myself messing with the engine, or diagnostics.
The TPS sensor is self calibrating. I'm willing to bet all the shop did was flash your computer memory by disconnecting the battery cable for 5 minutes.

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post #14 of 47 Old 07-11-2010, 12:10 AM
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Too much I guess I never trusted myself messing with the engine, or diagnostics.
Guess you're going to pay mechanics a lot of money, then. I say dive in and learn how to do it on your own, and put the money you save in shop labor rates back into your Jeep in forms you can actually use...

I hate hearing that you got ripped off, man.

If it's worth doing, then it's worth overdoing.

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post #15 of 47 Old 07-11-2010, 09:17 AM
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Always do a PCM reset/flash after replacing any input sensor:

1. Disconnect the battery by removing the positive battery cable. Remember, the positive battery cable.

2. Ground the positive cable to the negative cable for 30 seconds to erase the electric charge in the capacitors.

3. Reconnect the positive cable to the battery.

4. Turn the key to on but do not start.

5. Turn the headlights on.

6. Turn the headlights off.

7. Turn the key off.

This forces a PCM flash to factory-start specs; over the course of the next 50 warm-up cycles, it will update parameters and fine-tune everything.
Just curious, why do you recommend the positive cable first?

http://www.jeepforum.com/forum/f9/diy-alignment-kit-steps-w-pics-2264465/
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