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Old 09-15-2004, 11:40 AM   #1
garface
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Default Necessary to disconnect battery for ECU swap?

To pop the ECU out and put a new one in, will it matter if the battery is connected? Thanks.
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Old 09-15-2004, 12:05 PM   #2
overdose
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definately wouldn't hurt, i'd do it just incase
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Old 09-15-2004, 12:05 PM   #3
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Yes, there is full-time power there and you don't want to do the swap while the ECU is "live". More chance for damage that way. Be safe and disconnect the battery, the only thing you will lose is the settings in your radio.
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Old 09-15-2004, 12:30 PM   #4
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I was thinking that it would be a good idea. But then again, I never did -- and I've taken out the Ecu about a dozen times over 2 years. Knock on wood. Not a problem
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Old 09-15-2004, 01:10 PM   #5
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Considering that disconnecting is not a PITA at all, I would disconnect it any time you are doing anything with the electrical system. Don't know what adverse effects you may have from not doing it, but better safe than sorry.
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Old 09-15-2004, 01:31 PM   #6
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Quote:
Originally Posted by Mulder
Be safe and disconnect the battery, the only thing you will lose is the settings in your radio.
And your trip mileage on the odometer.
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Old 09-15-2004, 02:31 PM   #7
theBob
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What about pulling the ECU fuse? I don't want to spend hours going over wiring diagrams, but with key off, ECU fuse out, seems to me that there shouldn't be any power there. Correct me if I'm wrong.
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Old 09-15-2004, 02:55 PM   #8
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Quote:
Originally Posted by theBob
What about pulling the ECU fuse? I don't want to spend hours going over wiring diagrams, but with key off, ECU fuse out, seems to me that there shouldn't be any power there. Correct me if I'm wrong.
Why bother? You already need to have your wrenches out to take the footplate off. The whole operation takes a max of 10 minutes, even with taking the battery cable off. It's got to be one of the easiest mechanical projects on a WRX.
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Old 09-15-2004, 11:21 PM   #9
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Yeah, but the trip odometer.... You just can't get that part of your life back.
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Old 09-17-2004, 12:17 AM   #10
subiesown
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Hahahaha!
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Old 09-17-2004, 01:35 AM   #11
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ahhhh, nothing like hot swapping an esd device
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