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Old 09-15-2010, 06:38 AM   #1
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Join Date: Aug 2010
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Need some help please

Hi I have a 2002 tj 4.0 auto. Recently when ever I come to a stop the idle gets funky but just low and it's died a couple of times when it gos crazy the check engine light comes on. So I did the thing to get the codes an it came back with. P0122, P0123, P0455. First two are the throttle position sensor voltage low and high. Does any one know what causes this? And the other is a leak in the evaporate system. I have no clue on that. My jeep has 50 k miles on it. Any help would be greatly appreciated.

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Old 09-15-2010, 07:19 AM   #2
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I've have this same issue, but it only happens to me about once every six months. I have no idea what it is. Ive tried to recreate the problem but can't. Its impossable to trouble shoot when you have no where to look. You may have better luck finding the problem because yours sounds like it happens more.

I know thats not really any help in solving the problem, but at least you know your not alone

Plus just to give someone more infomation that might have an idea as to what it is. I have an 04 Rubi, 63k it happens to be when I come to a stop (ie: stoplight or sign) it idles real rough, rpm drops, it has died and I've kept it running buy playing with the pedal. Happens quick and is over quick, if it dies it does start up again with no problem.

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Old 09-15-2010, 09:23 AM   #3
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Yeah that's exactly what mine does. Some one told me that the sensor is going bad. That detects your idle. I dunno
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Old 09-15-2010, 07:14 PM   #4
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As far as the evap code goes I had the same problem a while back. Check the gas cap and make sure it's on tight. My cause turned out to be a little (green on mine) screw on cap up between the throttle body and the brake fluid reservoir. Tightened that (hand tight) and it solved the problem
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Old 09-15-2010, 08:36 PM   #5
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Ok I'll look into that rubi thank you
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Old 09-23-2010, 02:35 PM   #6
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I just had the same problem with the throttle postion sensor. Took the jeep to Checker Auto Parts, bought the sensor ($35), and the manager put it on for me right in the parking lot of the store in about 5 minutes. Just has one electrical connection and 2 allen screws (on my 2002 wrangler sport, 4.0L). Hope it helps.
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Old 09-23-2010, 03:55 PM   #7
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I agree. Replace the TPS. Won't take you but a second to do it.

On a similar note on my Land Rover it required a reset with testbook (dealer software) to get the ECU to correctly read the new TPS and IACV. Does that apply to our Jeeps as well? Does the ECU need to be reset? I ask this here not to hi-jack but because it is applicable if he replaces his TPS.

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