CoolDoodz99

So someone used my truck and the check engine light came on...I'm not sure if there's anything they did to cause a problem or it would have happened anyway. I kinda need to figure it out because I need to take my truck on a long trip soon. I took it for a short drive and couldn't detect any symptoms. I know the units they let you use at autozone won't work for 96 and older vehicles. Is this something a dealership might check for free?

Robert m

iTrader: (2)

use a paper clip and jump TE1 and E1 terminals under the hood in the diagnostic port.
http://www.4crawler.com/4x4/CheapTri...CheckConnector

Fink

Moved to the Newbie Tech section.

Very good advice above.

Fink

CoolDoodz99

Thanks guys, so I did the paper clip jump thing, the light flashes twice, pauses, then flashes 7 times, then long pause, and repeat. I don't see on that link if it tells which code means what?

Tofer

3.4 swap then use the obdII port

MudHippy

Make sure you've counted the flashes correctly. What you're saying would constitute a code 27 or 72 possibly. Neither of which actually exist(nor does code 2 or 7 because there are no single digit codes).

So try that again then see the link below.
http://personal.utulsa.edu/~nathan-b...85diagnosi.pdf

CoolDoodz99

It's strange, I found that after I counted the first time and realized it didn't exist. I assumed maybe it was 26 and I had just counted an extra. But I went out and counted again and I'm positive it's 2 and then 7. *shrug*

MudHippy

Could be time to replace the ECU.

Or just ingore it, for now, if it seems to be running fine. Could be just a harmless "glitch". I've had a similarly mysterious code 11 dilemna going on 4 years now. Long story... but there did used to be a code 11 for this engine(code 11 = momentary power loss to the ECU). Pre-90, so only on the 88 and 89(I think). What that damn code actually means(as in what's really happening), and/or how to alleviate it, evades me to this day. So, the check engine light means nothing to me now, because it's on more often than it's not. That's unless I can tell something isn't right by how it's running. Then I'll check the ECU for another code(s).

Good luck.

CoolDoodz99

So I reset the ECU and now the check engine light is off, although it's only been a couple short trips, but no noticeable symptoms, so hopefully everything is OK.