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I have a particular problem with my civic, it is experiencing battery drain issues in which I have been told could be the ECM. I have replaced the alternator and have had the battery check and all were fine. I was instructed to pull fuse 23?? which would lead to tell me if it is the ECm or not.


the real question is I was told I would need to take my car in to the local Honda dealership if I swap computer. any reason why??




thanks!

 
Rep Power: 518

Rule #1: It's never the ECM. (PCM if it's got an automatic trans, and it's not the problem either.)

It's not real tough to figure this out through pointed testing if you know what you are doing.
Prove there really is an excessive drain by using an ammeter.
Then diagnose where that drain is.

I see bad batteries pass the digital tester tests almost daily.
Why? What would that do or prove?
For programming the immobilizer. The engine will not run until this is done.

That's an awful lot of expense for a (more than likely wrong IMO) guess.

 
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ok, I have heard that this year had issues with the PCM and the battery not charging from the alternator. I already replaced it and still having issues

 
Rep Power: 518

Do you have an excessive drain on the battery overnight?
Or do you have a charging system problem?

Both systems can be tested to prove if there is a problem or not.
(I don't mean tested at Autozone.)


I personally have not witnessed a PCM cause either issue. Not saying it can't happen, but I have not seen it myself.
I've fixed various other causes of batteries going dead in those cars though.