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Old 12-31-2010, 12:25 PM   #1
daigle
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Proper way to disconnect Battery?

My fan belt blew because the tensioner plastic peices shredded. I replaced the part and the fan belt and the car runs again, but the check engine light is still on.

I was told that if I disconnect the battery for 15-30 minutes, the computer should reset if there is nothing else wrong with the engine. However, i was informed that there is a correct procedure to do this, such as removing only the negative coupling and not the ground/positive.

Is this correct?

I have a 2007 Focus, and apart from this one incident has been the absolute best vehicle I have ever owned.


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Old 12-31-2010, 12:29 PM   #2
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YES, always remove the ground (black) cable first . You dont have to take off the (red) positive cable. And it should only take 5 -10 minutes to reset the PCM.
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Old 12-31-2010, 12:34 PM   #3
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If you put drain on the electrical system it can reset much faster. Disconnect battery, turn on the headlights, put your foot on the brake, and cycle the key a few times. ECU will reset fast that way.

100% agree on remove neg cable first on battery disconnect, BTW. You can't arc neg to chassis, and once neg is off, you can't arc the pos side either.
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Old 12-31-2010, 02:26 PM   #4
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Remove ground first, and connect ground last
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Old 12-31-2010, 02:49 PM   #5
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are you saying to remove both capables in the proper order, OR only remove ONE cable???????
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Old 12-31-2010, 02:52 PM   #6
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Disconnecting the neg cable is sufficient for performing maintenance or restting the ECU
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Old 12-31-2010, 06:44 PM   #7
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Posted via FF MobileThe proper order is for safety only, and as mentioned once one cable is off nothing will get power. The idea is that if your wrench contacts anything while removing the negative first, it won`t spark since it contacts the chassis anyways. If you do the positive first, anything you touch by accident will cause a BiG spark, and batteries can even blow up this way from hydrogen gas given off while charging....
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Old 01-02-2011, 03:10 PM   #8
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It worked! Thanks to all. Happy New Year!
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