ECU/Electrical Problems -removing battery

[Burg Boxster]

No issues. Whenever you disconnect the battery (I think for at least 1 min), the ECU has to relearn anyways. Thus why you can't simply pass emissions testing by quickly disconnecting the battery to clear a CEL and then get the test done once reconnected. The car has to run thru a full prep cycle (readiness test) to ensure all parameters are met and cycled thru. Go ahead a disco it for the winter but obviously leave it on a charge...

BTW, I hate hearing all this winter prep crap. I'll have to put my car away but HOPEFULLY [fingers crossed] it won't be until Dec????

[mikefocke]

change it (15 minutes).

And always thought/found it harmless. OK the windows had to relearn and the radio code had to be entered and it ran rough for 15 minutes.

But the latest issue of Excellence contains an article with some warnings against ever disconnecting the battery without maintaining power some way.

I was surprised. I haven't seen any online discussion of the article.

[JFP in PA]

Actually Mike, when someone asks about getting a maintainer, I usually suggest that if there is to be only one, it needs to have a "supply" mode (like the Ctek 7002 model), which will continue to deliver the correct current for this process (most maintainers will sense the battery disconnect and turn the current off if you leave them connected to the cables while taking the battery out). Along with being a traditional maintainer, these models can be switched to the supply mode when disconnecting the battery, which circumvents all of the issues listed in the Excellence article. Yes, models with this feature cost a bit more, but if you own multiple units, only one needs this feature as you can move it to the car you are working on.

We use one of the 7002's in the shop for this exact purpose.............