Here is what you do to fix this or any other EEC IV problem. 1) Go to the library and photo copy EVERYTHING in the Mitchell manual on your ECC IV system. This will include among other things, a bunch of Flow charts and test procedures. Some of these are labeled by the failure code.
I did that and much more, it's all in my book. For more details go to "merkurencyclopedia.com" and click on "Idea Factory".