Proper way to disconnect Battery? - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 12-31-2010, 11:25 AM   #1
daigle
Focus Rookie
 
Join Date: Dec 2010
Fan#: 81494
Location: Pasadena, TX
What I Drive: 2007, White

Posts: 3
FF Reputation: 1 daigle Good Standing Member
Buy-Sell-Trade Rating: (0)
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.


daigle is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 12-31-2010, 11:29 AM   #2
iroc34
Focus Fanatic
 
iroc34's Avatar
 
Join Date: Sep 2009
Fan#: 69289
Location: Miami Beach, FL
What I Drive: 2011 Ford Taurus Limited

Posts: 2,176
FF Reputation: 18 iroc34 Great Standing Member
Buy-Sell-Trade Rating: (13)
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.
iroc34 is offline  
    Reply With Quote
Old 12-31-2010, 11:34 AM   #3
DanUSVT
Focus Enthusiast
 
Join Date: Nov 2010
Fan#: 80691
Location: Lewisville, TX
What I Drive: 2003, Red, SVT 3dr

Posts: 84
FF Reputation: 1 DanUSVT Good Standing Member
Buy-Sell-Trade Rating: (0)
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.
DanUSVT is offline  
    Reply With Quote
Old 12-31-2010, 01:26 PM   #4
PiSTOLpete717
Focus Enthusiast
 
PiSTOLpete717's Avatar
 
Join Date: Dec 2010
Fan#: 81212
Location: 717, PA
What I Drive: 2002 Infra Red SVT FOCUS #2294

Posts: 438
FF Reputation: 1 PiSTOLpete717 Good Standing Member
Buy-Sell-Trade Rating: (0)
Remove ground first, and connect ground last
__________________
I Got this On Lock
PiSTOLpete717 is offline  
    Reply With Quote
Old 12-31-2010, 01:49 PM   #5
daigle
Focus Rookie
 
Join Date: Dec 2010
Fan#: 81494
Location: Pasadena, TX
What I Drive: 2007, White

Posts: 3
FF Reputation: 1 daigle Good Standing Member
Buy-Sell-Trade Rating: (0)
are you saying to remove both capables in the proper order, OR only remove ONE cable???????
daigle is offline  
    Reply With Quote
Old 12-31-2010, 01:52 PM   #6
DanUSVT
Focus Enthusiast
 
Join Date: Nov 2010
Fan#: 80691
Location: Lewisville, TX
What I Drive: 2003, Red, SVT 3dr

Posts: 84
FF Reputation: 1 DanUSVT Good Standing Member
Buy-Sell-Trade Rating: (0)
Disconnecting the neg cable is sufficient for performing maintenance or restting the ECU
DanUSVT is offline  
    Reply With Quote
Old 12-31-2010, 05:44 PM   #7
sailor
"Elder"
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 11,638
FF Reputation: 60 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
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....
sailor is offline  
    Reply With Quote
Old 01-02-2011, 02:10 PM   #8
daigle
Focus Rookie
 
Join Date: Dec 2010
Fan#: 81494
Location: Pasadena, TX
What I Drive: 2007, White

Posts: 3
FF Reputation: 1 daigle Good Standing Member
Buy-Sell-Trade Rating: (0)
It worked! Thanks to all. Happy New Year!
daigle is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:43 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.