Chrysler Repair: 2008 town and country several codes.

Question
QUESTION: I have  a 2008 town and country with a 3.3l and 175k. The van is giving a p0403 code. I have replaced the egr, ait, throttle body,upstream 02, and cleaned out the upper injector harness that is missing(and still can't find) seal. It will run rough for a little while, or die right after starting. The exaust runs clear or slightly visable. this last time it came on quickly. If i unplug the egr it will run ok. but it does smell. not sure if it is rich or exaust.

More background.
When I first started having an issue I was getting several codes. From egr, misses, throttle body, Injector errors. I replaced the egr first, then the throttle body. They didn't fix it. I then took the intake manifold off to move the injectors to see if the codes moved. when I did that I unplugged the harness that runs to the injectors, ignition, egr, and water temp sensor. When I did I noticed water inside the connector. I cleaned it out and it ran fine. It started acting up again. It was again the plug. This time i noticed the connector had a seal missing. I filled the connector with dielectic grease and zip tied a bag over it till I could find a seal. Now it is running rough again. I took the connector apart and cleaned it out. but that is not the problem. The only code that comes up now is the p0403 for the egr circut. I got a code for the upstream 02 and ait. I have replaced both.

Thank you in advance.

ANSWER: I will think about this and be back shortly this evening.

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QUESTION: i will be happy to do what i can to help you.  i will look forward to your response. i have a cheap volt meter. but i do not have information on the correct voltages to the different sensors. nor do i have a hand held scanner.  i am fairly handy. but i am stumped on this one.

ANSWER: Hi Chris,
I just responded with a revised answer to your first question.
Roland

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QUESTION: do you know what voltages i should get? last time i looked i had 14 volts at the two on the one side. 14v 7 v and 5v across the top. i will check the rest tomorrow. i do not have the wiring digram. do you know what plug it is on the pcm? i have rated your response. i am not sure you can respond or not.

thank you

Answer
Hi Chris,
All those pcm pins are on the C2 plug which is black/orange. Pin 6 is a control wire and so its reading may vary from 14 on down, pin 4 is grounded as is pin 3, pin 2 should show 5 v, and pin 1 will be variable as well as it is the signal wire that tells the position of the valve. I would be inclined to unplug both plugs and check for continuity rather than focus on the voltages.
If you would be so kind as to do another rating and nomination of me I would be most appreciative as I am neck and neck with another "expert" to be volunteer of the month.
Roland