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My daughter's 2006 Taurus was running well till last night when the Check Transmission and Check Engine lights came on. She said it didn't have any problems running even after that to get home (only 1 or 2 miles). This morning it had problems starting and when it did it idled poorly and didn't shift gears correctly. Took it to O'Reilly's to get the error codes and when they tested it they saw over 50 codes across every system.

I suspected the PCM but didn't want to order a new one on a hunch so I took it to a local shop for a diagnostic. But after they looked at it for a while they said they don't know for sure what the problem is but they suspect a short in a wiring harness somewhere and didn't want to pursue it. They said to take it to the dealership or to try and find an electronics shop. They didn't think it was the PCM because when it fails it doesn't normally put out a bunch of codes like that. Any thoughts on where this short might be? I'm hoping it's a known problem that I just can't find with my searches of the forum. Is there possibly a trick to track this down?

With a quick inspection of the wiring I only saw one suspicious spot as the wiring ran past the alternator and it had worn through the plastic harness shielding and was rubbing on the plastic coating of the wires. The plastic coating on some of those wires was stuck together but none appeared to be worn through to exposed metal in the wire.



Thanks in advance.
 

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Can you post some of the codes? Have you thought to check the simpler stuff first (ie: spark plugs, spark plug wires, coil pack, etc)? Give me an update on this currently situation



Gillette
 

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PCM ground would be the first thing I'd check. Lots of posts on cleaning that on here. Weak batteries are a major concern and a common problem that affects the cars electronics also.
 

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PCM ground would be the first thing I'd check. Lots of posts on cleaning that on here. Weak batteries are a major concern and a common problem that affects the cars electronics also.

Might I add?
See pic, this is what a common cable looks like, JY cars many times worse. This is very easy fix. Dip this whole thing in a cup of household ammonia for 20 minutes or so, wipe off and apply anti corrosion compound. Ammonia is a gas dissolved in water, it leaves no residue. Caustic and kills the acid corrosion. Once in 5-10 years will save you a lot of pain. Along with fixing the bad FORD idea of bolting grounds over paint. My herd fixed. My starter cranks "brisk" and it gives me confidence it will go, every time.


I have seen many JY cars, most have failed cables, including the acid eating through the throttle cable. Take a car to the shop with failed throttle/cruise cables and they would say, not worth fixin. Call Pick a Part to haul it away. More selection at the JY for me.
-chart-
 

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I came back to the forum to post another question and thought I should follow up with how this one played out. Sorry, I should have done it sooner since the knowledge may have helped someone else.

Took the car to an electronics specialist and he was able to identify that all the error codes that appeared unrelated all had to do with a single fuse. The fuse was blown and continued to blow every time it was replaced (I can't believe I didn't even think to check the fuses, duh). He eventually tracked it down to a short in a wire near one of the O2 sensors.

The only thing that made me feel better about not fixing it myself was that the first shop said it was beyond what they would work on.

Cost a lot of money to learn that lesson but at least I was able to apply the knowledge to an almost identical situation a year later on my F150 to find a wire melted against my exhaust manifold. Check the fuses, get a wiring diagram, and track it down.

Thanks everyone.
 

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The first shop didn't want to work on it because they know electrical wiring issues take a lot of time and hard to fix. They can make more on routine jobs. That failure of O2 sensor wire and blown fuse has been posted and figured out on the forum before. It won't set fifty codes but affects the AC and a bunch of other things.
 
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