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Aurora40 · 09-04-2005

Short answer from someone only mildly informed. The ECM can detect errors with itself to a degree. Obviously depending on how it is flawed, it might not do that. I suppose diagnostics could help narrow this down. Another way would be to just swap the chip. If your car had the recall done, do you have the original PROM? Would be a quick way to rule it out.

Also, just to clarify, by "check code", that means that code 12 is always there. It means nothing except that the code checking procedure is working. You will always get 12, next code, next code, etc. So if there are no codes, you'll just get code 12.

Edit: just a quick also, each code will flash 3 times. So make sure you are waiting through 3 instances of "12" to see if there is a next code.

09-04-2005	#8
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Short answer from someone only mildly informed. The ECM can detect errors with itself to a degree. Obviously depending on how it is flawed, it might not do that. I suppose diagnostics could help narrow this down. Another way would be to just swap the chip. If your car had the recall done, do you have the original PROM? Would be a quick way to rule it out. Also, just to clarify, by "check code", that means that code 12 is always there. It means nothing except that the code checking procedure is working. You will always get 12, next code, next code, etc. So if there are no codes, you'll just get code 12. Edit: just a quick also, each code will flash 3 times. So make sure you are waiting through 3 instances of "12" to see if there is a next code.