paladin_w Posted November 8, 2003 Share Posted November 8, 2003 I was under the impression that disconnecting the battery would reset the ECM and reset all the codes. However when I did that my check engine light stayed on. I have the problem with my EGR flow that I guess is stumping quite a few people it is on page two I still would appriciate any input on it. But I was reading other posts and people were talking about if the battery was disconnected and the gas hit, or car driven directly afterwords, which is exactly what I did before my problem started the ECM would not have time to get used to the current tune-up and condition of the engine, climate, ect... I still do not have any change on my EGR situation unfortunatlly either, and do have access to a OBD II at my office. Is the check engine light staying on from perminate memory codes or did it just not reset? Quote Link to comment Share on other sites More sharing options...
Hocrest Posted November 8, 2003 Share Posted November 8, 2003 How long was it disconnected. I tried for 30 minutes and it didn't clear. When it was disconnected for over an hour to install a stereo, they cleared. What model and year? Quote Link to comment Share on other sites More sharing options...
CROSSTBOLT Posted November 8, 2003 Share Posted November 8, 2003 More convenient to pull the fuse for the ECU or Engine Ignition(Eng Ign) on the interior fuse panel. I ain't that smart: I learned this technique right chere from all deese guys and gals! Quote Link to comment Share on other sites More sharing options...
paladin_w Posted November 8, 2003 Author Share Posted November 8, 2003 I knew I forgot to mention make and model, then again maybe it was subconcensus wanting people to read my EGR problem post...hummmm It is on a 97 OBW Limited. I will try to leave the cable off longer if I try it again, like all night or something. Thanks. Karl Quote Link to comment Share on other sites More sharing options...
alia176 Posted November 8, 2003 Share Posted November 8, 2003 Another option is to take it to a Autozone and have them check the code and reset it for free. Quote Link to comment Share on other sites More sharing options...
paladin_w Posted November 8, 2003 Author Share Posted November 8, 2003 Yes, I have recomended that to others, but if your autozone is like mine they will not reset anymore, my guys all know me, and they said they were given a direct order from their managers not to reset the codes anymore since there is something about a class action suit for people getting their codes reset so they will pass emissions, this is prevailent in states that use OBD II testing to pass emissions on cars. However reseting the codes does not fully reset the ECM, it only clears the trouble codes and tells the ecm all should be well and to put everything back to its last good operational specs ie. aggressive timing curve, air/fuel mixture and such. Reseting the ECM completely by battery depletion will force the ECM to in essence relearn the current setup and condition all overagain starting from the factory presets. I don't mean to be cross or anything I have had 3.5 hours of sleep and working my second shift on an 8 hour turnaround, I do appriciate all suggestions. Quote Link to comment Share on other sites More sharing options...
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