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Old 11-14-2009, 15:30   #1 (permalink)
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EEC-IV code 511

Hi, I have 93 Thunderbird 3.8 LX. Sporadic the "Check Engine" light comes on and the car lose its power. The EEC-IV gives a code 511, does this mean that the computer is broken or could it be something else?
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Old 11-14-2009, 15:42   #2 (permalink)
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Re: EEC-IV code 511

That code means: No power to PCM pin 1 or bad PCM (processor)
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Old 11-14-2009, 15:48   #3 (permalink)
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Re: EEC-IV code 511

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Originally Posted by rtg143 View Post
That code means: No power to PCM pin 1 or bad PCM (processor)
Yes, or "511 -- Read Only Memory test failed", but does this mean a broken computer?
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Old 11-14-2009, 17:02   #4 (permalink)
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Re: EEC-IV code 511

Is there power at pin #1?
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Old 05-30-2010, 06:57   #5 (permalink)
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Re: EEC-IV code 511

I gave this up, and stored the car for the winter. Now I am trying to solve the problem, but am stuck again. I still sporadic have the 511 code. Pin 1 seems to have 12.7 volt when power is off, 12.5 volt when power on engine not running and 14.6 volt when engine is running. From time to time I am not able to read fault codes. This is when "Check Engine" lamp is on all the time. Could it be that the self test never completes? Does anyone have any suggestions?
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Old 05-30-2010, 09:42   #6 (permalink)
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Re: EEC-IV code 511

You probably need a PCM. Here's a site with info on your system. Ford Fuel Injection
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Old 05-30-2010, 10:17   #7 (permalink)
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Re: EEC-IV code 511

Do I have to use an EEC IV computer from a 3.8 Thunderbird, or is a computer from another car and engine combination compatible?
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Old 05-30-2010, 10:43   #8 (permalink)
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Re: EEC-IV code 511

They're very engine combination specific. Check that website, they have some info on that.
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Old 07-03-2010, 11:37   #9 (permalink)
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Re: EEC-IV code 511

I replaced the eec iv and that solved the problem. It was a California computer in the car, but I replaced it with a non California computer and that swap seems to be ok.
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Old 07-03-2010, 12:56   #10 (permalink)
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Re: EEC-IV code 511

Glad you got it working. Thanks for the update.
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