Understanding Ford OBD

[ka9mnx]

I hope this is the right thread.

On a 1993 F150 I'm reading an EEC-IV code (334-EVR voltage High). I can trubleshoot that and it's not my question.

I purchased a code reader a few years ago because I was tired of frantically county the CEL flashes and writing them down. Good purchase since I'm keeping the truck until it dies.

Here is the question: If there are 2 codes stored a first code, followed by an 11 or 10 then the second "continuous code". Is the first code or the second code the "hard code" stored in memory? I have both codes and I'm trying to figure out which one was last encountered and which one was a hard code.

I have tried reading up on this and cannot get a good explanation.

Thanks to all and remember WWI and all our VETS.

 

[ka9mnx]

Think I found the answer.

The first codes are KOEO self tests. The second are the "hard codes" set while driving.

Sorry but I just tried another site that explained it well.

https://www.corral.net/tech/maintenance/eecivtest-koeokoer.html#koeo

 

[Linctex]

I hope that information stays around a while...

I have a 5.0 in my 1993 Ranger, and it would suck if that EEC-IV info falls off the face of the 'web someday

 

[zzyzzx]

I have also used the information from that site for my 1995 Escort.