redsupraman82 Posted January 18, 2012 Share Posted January 18, 2012 sorry for asking guys, i have been searching but can seem to find anything? Quote Link to comment Share on other sites More sharing options...
Littler Posted January 18, 2012 Share Posted January 18, 2012 I believe leaving the battery disconnected for more than 30 mins does it, could be wrong? Quote Link to comment Share on other sites More sharing options...
andz222 Posted January 18, 2012 Share Posted January 18, 2012 (edited) i belive there is a fuse also u have to remove from the fusebox for a few secs Tutorial for Supra MKIV : RESETING THE ECU Edited January 18, 2012 by andz222 (see edit history) Quote Link to comment Share on other sites More sharing options...
redsupraman82 Posted January 18, 2012 Author Share Posted January 18, 2012 which one? Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 18, 2012 Share Posted January 18, 2012 Disconnect ECU fuses for 5 mins. Or pull the negative terminal off the battery for the same time (and lose your radio stations!) Quote Link to comment Share on other sites More sharing options...
andz222 Posted January 18, 2012 Share Posted January 18, 2012 ECU fuse Quote Link to comment Share on other sites More sharing options...
merckx Posted January 18, 2012 Share Posted January 18, 2012 which one? EFI No1. fuse. Quote Link to comment Share on other sites More sharing options...
Noz Posted January 18, 2012 Share Posted January 18, 2012 What would a requirement be to need to disconnect the ecu to reset it. Quote Link to comment Share on other sites More sharing options...
supraGZaerotop Posted January 18, 2012 Share Posted January 18, 2012 id like to know this, is it worth doing? if so what will i gain?What would a requirement be to need to disconnect the ecu to reset it. Quote Link to comment Share on other sites More sharing options...
andz222 Posted January 18, 2012 Share Posted January 18, 2012 why would u want to reset the ecu anyway Quote Link to comment Share on other sites More sharing options...
Nic Posted January 18, 2012 Share Posted January 18, 2012 id like to know this, is it worth doing? if so what will i gain? Yes to clear any old fault codes that may be stored. Note, after resetting the ECU the car may not idle properly and run a bit lumpy to start with, it'll take a few miles of driving for the ECU to relearn the settings. Quote Link to comment Share on other sites More sharing options...
Noz Posted January 18, 2012 Share Posted January 18, 2012 Resetting ECU faults was the only thing I could think of. It actually solved my engine problem which was running too lean and misfiring. ECU reset and the things never run better. Was wondering if this was the only problem that could be solved. Seems that it is Quote Link to comment Share on other sites More sharing options...
superdooper Posted February 16, 2012 Share Posted February 16, 2012 Some times you may need to re-set it twice, ive had instances of this in the past, a good drive after for the engine to re-learn its running settings is advised. Quote Link to comment Share on other sites More sharing options...
superdooper Posted February 16, 2012 Share Posted February 16, 2012 uhm ......As Mr nic said :$( red face) Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 18, 2012 Share Posted February 18, 2012 Remove EFI fuse no1 to reset the ECU and clear stored codes. Removing the battery will do the same but is overkill as you'll lose your radio and clock settings as well. You just need to pull the fuse and put it back, the ECU memory is volatile and is lost the moment it loses power. 5 minutes is daft, 30 minutes is ludicrous Resetting the ECU will clear long term fuel trim maps (and ignition trim maps as well). This can cure a problem with overly lean running, it's worked for me once and apparently Noz as well. Resetting the ECU is not a silver bullet though, despite that I've seen it recommended as a 'fix' for all sorts of crazy things. I know the Toyota manuals say how long it takes to relearn, and it's not long. From memory, it's about 30 seconds from starting the engine to get all the closed loops and idle stuff sorted, and about 3 miles of normal driving to sort out the timing. I do know it's nothing like the numbers I've seen bandied about, like 50 miles or an hour of driving -Ian Quote Link to comment Share on other sites More sharing options...
Chris Bailey Posted February 18, 2012 Share Posted February 18, 2012 I know these a fuse somewhere, but i think ajlittler is correct when he said just disconnect the battery for 30 mins. Quote Link to comment Share on other sites More sharing options...
Josh Posted February 18, 2012 Share Posted February 18, 2012 I know these a fuse somewhere, but i think ajlittler is correct when he said just disconnect the battery for 30 mins. I'm sure there's one somewhere too. Oh, wait! ECU fuse Remove EFI fuse no1 to reset the ECU and clear stored codes. Removing the battery will do the same but is overkill as you'll lose your radio and clock settings as well. You just need to pull the fuse and put it back, the ECU memory is volatile and is lost the moment it loses power. 5 minutes is daft, 30 minutes is ludicrous Resetting the ECU will clear long term fuel trim maps (and ignition trim maps as well). This can cure a problem with overly lean running, it's worked for me once and apparently Noz as well. Resetting the ECU is not a silver bullet though, despite that I've seen it recommended as a 'fix' for all sorts of crazy things. I know the Toyota manuals say how long it takes to relearn, and it's not long. From memory, it's about 30 seconds from starting the engine to get all the closed loops and idle stuff sorted, and about 3 miles of normal driving to sort out the timing. I do know it's nothing like the numbers I've seen bandied about, like 50 miles or an hour of driving -Ian Quote Link to comment Share on other sites More sharing options...
CJ Posted February 18, 2012 Share Posted February 18, 2012 I know these a fuse somewhere, but i think ajlittler is correct when he said just disconnect the battery for 30 mins. I sometimes despair at the comments posted. Obviously ajlittlers experience vastly overshadows that of ianc who has been a tech mod (and supra guru) for the past x number of years! . Quote Link to comment Share on other sites More sharing options...
Dave Posted February 18, 2012 Share Posted February 18, 2012 I sometimes despair at the comments posted. Obviously ajlittlers experience vastly overshadows that of ianc who has been a tech mod (and supra guru) for the past x number of years! . Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted February 18, 2012 Share Posted February 18, 2012 I really can't see that resetting the ECU is going to cure much, the only thing's retained would be idle fuel trims and closed loop fuel trim, as for timing it would only be the default knock map, if you think about it the ONLY way the ECU gets any feedback about fueling is how it adjusts fuel trim to remain stoic at idle and closed loop via the lambda sensor voltage, and timing through the feedback from the knock sensors. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 18, 2012 Share Posted February 18, 2012 I've found an axe is the best way to ensure it's completely disconnected. Quote Link to comment Share on other sites More sharing options...
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