[Diy_efi] Welding on cars w/ ECU's??

[Programmer]

Easiest answer is that it probably started from the autobody industry. Hi
frequency machines "theoretically" could induce voltages into the PCM (some
are mounted lower left/right fender, others at the frame horn, etc...) and
fry the chips--I've never had or have seen this problem,  but you never know
when some "welder" is going to put the ground clamp onto a PCM / ECM case,
"someday". We do have a giant capacitor that we install across the battery
terminals when doing any weld repairs--just in case.

Lyndon ; )

----- Original Message -----
From: "Chris Spies, ATI ProCharger" <proddev at procharger.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, January 31, 2003 1:26 PM
Subject: [Diy_efi] Welding on cars w/ ECU's??


Can anybody explain to me why it is you can not (at least the aftermarket
manufacturers prefer that you not) weld on a vehicle while the ECU is
connected (electrically) to the vehicle?  It seems that muffler shops weld
on vehicles with factory ecu's all day long without trouble, however I have
heard many horror stories of damaged aftermarket ECU's and ignition boxes
when somebody neglected to disconnect the harnesses?  I have never really
been given a good answer, I just follow the rules and hope to avoid
disaster...

-thanks
-Chris



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