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Old 02-21-2012, 09:00 PM   #1 (permalink)
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Default 2004 DOHC Taurus w/Multiple Issues

Had someone at my office approach me today, as they heard I worked on Tauruses (true, but I'm very very far from a mechanic).

In the past couple of years this car has had a new AC compressor installed and a new Alternator.

Car is a 2004 Ford Taurus SES (w/ABS, but no traction control) and the DOHC engine.

He presented me with the following codes he had on the car:
P0606
P0430
P0301
P0316

Oh good.

It also has some issue with the antilock braking system. The car can be cruising down the road, then without warning the Brake and ABS lights will turn on, on the dash, then they'll start flashing, and the engine shuts off.

The Check Transmission light comes on during warmer weather on longer cruises.

If someone turns on the AC, the car starts to buck, then the engine will shut off.

I'm bringing along a spare COP tomorrow to check how the Cylinder 1 coil looks, to see if that fixes P0301 and the engine bucking under load (AC).

Otherwise...Where the heck do I start with this car? I volunteered to look at it next week if he can get it to me.
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Old 02-21-2012, 09:13 PM   #2 (permalink)
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Wow, good luck with that one! Sounds almost like a "basket case" doesn't it? And I thought I had problems a month ago! My 3 were all minor next to this. A couple of those may be connected, but sounds like several individual problems. All I can suggest is similar to what I did. Start with the worst first, and attack them one at a time. I feel fortunate after reading your post.
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Old 02-21-2012, 09:19 PM   #3 (permalink)
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Nick, never have seen that po606 (pcm processor fault) before....?
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Old 02-21-2012, 09:38 PM   #4 (permalink)
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Sounds maybe to simple but how is the battery? Are the terminal posts and cables clean? Has the battery been 'load tested'?
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Old 02-21-2012, 09:45 PM   #5 (permalink)
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Quote:
Originally Posted by sheila View Post
Nick, never have seen that po606 (pcm processor fault) before....?
That 0606 is the real concern. That could explain all the other issues, like misfire on#1 and misfire in first 1000. A/C issues and engine quit.

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Old 02-21-2012, 09:55 PM   #6 (permalink)
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Yea I was just reading about it. I know Ford generally has robust PCMs.

But this PCM code really concerns me. Would explain the wonkiness.

The guy is only going to be in the US for only a few more months before going back to India, so he doesn't want to spend the car's trade in value @ Carmax fixing it.

I will definitely be taking the battery in to be load tested.

And I forgot, the alternator has been replaced in the past 2 years.
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Old 02-21-2012, 10:28 PM   #7 (permalink)
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P0606 is a concern. You might think about trying to swap the PCM during your troubleshooting.

First thing I would do is verify the all O2 sensors are switching properly and in the right voltage range. Test the battery/alt and make sure the connections are good. Brake and ABS lights usually mean the battery just died and the alternator gave up. Check for voltage stability while driving. The voltage problems could be related to a bad PCM. I would try and check the wiring by the PCM for damage as well. Check spark plugs/coils if you still have a misfire code.

Good luck.
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Old 02-22-2012, 07:46 AM   #8 (permalink)
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I also have never personally seen a 606. If the battery and terminals and major grounds check out, I am thinking the PCM is toast.

Use ETM to check system voltage while driving and see what voltage does when the car goes crazy.
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Old 02-22-2012, 08:36 AM   #9 (permalink)
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When you say "swap the PCM"...how would I swap it out? Isn't the ignition system tied to it, which would prevent me from starting the car w/a new PCM?

OK will do a battery, cables, alternator, and grounds check when I get the thing.

Jeff, can you elaborate what an ETM is? Sorry not lucking out on Google.

Thanks guys!
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Old 02-22-2012, 08:43 AM   #10 (permalink)
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engineering test mode nick, key off, press and hold the bottom button for the digital dash, ( reset i think) then start the car, voltage will be displayed as well as a ton of other info...
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