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troubleshooting Chrysler mini van 2003


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Carr
User

Sep 3, 2014, 8:46 PM

Post #26 of 34 (957 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

So I got the codes again. Four this time. 0106, 0118, 1478, and a new one: 1496. I am guessing that the wiring harness has a short, or that five volt reference thing is off. I don't know how to check it or fix it.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 4, 2014, 4:52 AM

Post #27 of 34 (952 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

Poor communication so do think wires and vacuum issues to bad grounds? IDK from here. It worked for a while so on comes the guessing that something in that area just being bumped has the problem.


From some older threads not witnessed was that battery placement was or could be a spot under it with assorted items that could be harmed by location or possible acids from battery? A place to look.


Dang - lotta cooks in this kitchen and no chef seems to be an issue as well,


T



Discretesignals
Ultimate Carjunky / Moderator
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Sep 4, 2014, 12:11 PM

Post #28 of 34 (936 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  


Quote
If you have a P1478 code popping up, it appears you'll need to replace the PCM. You should definitely make sure the PCM has good powers and grounds and that your 5 volt reference isn't being pulled down before replacing the PCM though. Just to be on the safe side.


I guess no one verified 5 volt ref when the problem was happening??

Yes, you should really focus on the 5 volt reference circuit. You might need a DSO to monitor the 5 volt reference to see if it drops out when the problem occurs. Might be able to catch it with a volt meter if the 5 volt ref is down long enough for you to start unplugging sensors one at a time to see if it comes back up. Your going to need a wiring schematic and connector pin out. The fun part is going to be finding the problem with the circuit because many sensors uses that 5 volt reference.

While your monitoring the 5 volt ref, wiggle wiring harness around to see if you can duplicate the problem. Hopefully your replacement PCM doesn't have the same issue as the old one.

Even though this video is of a Caddy with a shorted 5 volt ref, the procedure is the same. :
https://www.youtube.com/...6f8hn5oy4alB2WXJCIqA





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 4, 2014, 12:40 PM)


Carr
User

Oct 19, 2014, 3:50 PM

Post #29 of 34 (852 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

So I sent in both computers to have them checked. Turns out neither one was bad. It's not the computer. So much for that idea. Lol. Now I'm guessing it's a short. So where would the short be, and how to find it? That's the question. I am still thinking that the battery light coming on and the temp gauge becoming inoperable is a clue. Wish I personally knew a mechanic worth his salt


Carr
User

Oct 19, 2014, 4:47 PM

Post #30 of 34 (849 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

So I just drove it to get gas. Ran fine. Temp gauge worked fine too. Shifted normal. Idle speed correct. Turned it off. Got gas. Turned back on and temp gauge quit, idle increased, shift became sluggish again. Lol. It definitely has something weird going on with that gauge. Gauge working van working, gauge not working van has problems.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 19, 2014, 4:59 PM

Post #31 of 34 (848 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

Did NOT reread whole now old and long thread but when you have an intermittent much of anything and if when checked all is fine you are in trouble.


Problem must show itself while happening if not something in memory of something which may be lost when checked. Now if you have the most info, tools, equipment and know how and everything works fine when checked what would you do?


I did see that a whole cluster was a common issue was a clue and other than parts tossing at some point you need to or find someone to actually chase wiring one end to the other all over.


Just general on electric snags is that grounds that make whole metal of body grounded lose or break straps here or there and can be the problem for intermittent electrical or any connection of a harness for that matter. This isn't fun work and can use a lot of luck sometimes to know you've actually found and fixed something of the sort,


T



Carr
User

Nov 22, 2014, 4:11 PM

Post #32 of 34 (811 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

So I have fixed my problem. No it was nothing that any code showed. It was a short in the wiring harness. The codes made the mechanic I took it to change things that were fine. That is what I was afraid of in the first place. Today's mechanics are typically code driven. Find the code then change out a part. I solved the problem through research. I found others with the same problem who told me where they found their short. Anyway, there is part of the harness that is close to exhaust pipe. It's located behind the power steering reservoir. Turns out that it is common for the wires to melt there. Sure enough. Fixed the insulation which fixed the problem. Hopefully this can help others fix their problems.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 22, 2014, 4:20 PM

Post #33 of 34 (802 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  

Thanks for posting the source of the problem and the fix. Locked for archives for others to view OR you may request it re-opened by any moderator, T


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 22, 2014, 5:23 PM

Post #34 of 34 (793 views)
  post locked   Re: troubleshooting Chrysler mini van 2003  


Quote
Today's mechanics are typically code driven. Find the code then change out a part.


No, that's not the way it works. The computer has a self monitoring system and the codes alert the mechanic when the computer sees a malfunction. The codes do not tell anyone to change any parts. They describe a specific situation that the tech has to then troubleshoot to find the cause. A car can have a problem that doesn't set a code either so your vehicle may have had multiple issues so today's mechanic do not change parts unnecessarily. They troubleshoot known issues.



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