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Old 11-10-2012, 12:48 AM   #1
Dmois12
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does the 2012 focus ecu need to have ground

does the 2012 focus ecu need to be bolted to the frame or have a ground source for the car to start?


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Old 11-10-2012, 01:25 AM   #2
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Yes it has to have a ground.

I don't believe it's grounded through the case though.


If you're having start issues and have removed the ECU from it's home, odds are something you removed/moved during that process is causing the no start.
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Old 11-10-2012, 01:26 AM   #3
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yes because the computer controls most of the system using froundside switching, so it must have a common ground.
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Old 11-10-2012, 01:10 PM   #4
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The ECU housing it self no it doesnt , the ECU grounds through I think it was 13 grounds

What are you working on that your using a 2012 ECU

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Old 11-10-2012, 11:48 PM   #5
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Di-VCT generator is my guess lol.
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Old 11-15-2012, 06:29 AM   #6
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Hey guys,

Does the same question apply if I had a Zetec Hatchback? My brother and I are being handed one down in a few weeks time and he's talking about ECU tuning and I'm going to be honest, it's not my field at all but I'd just like to get a brief overview of time, price and results. If anyone has time, could they take a look at the website of the company my brother proposes to use? They're called tuned2race and they do ECU tuning, amongst other performance related stuff. I can't tell if it's legit with my amateur eyes. Many thanks!
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