What is the port in the back of the PCM actually for? - Ford Powerstroke Diesel Forum
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Old 08-19-2014, 08:43 PM
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What is the port in the back of the PCM actually for?

Obviously i know its where all performance chips go but i was wondering the other day what Ford actually put it there for. Back in 1994 there was little if any modifying diesels electronically so it wasnt designed with performance chips in mind and its something ford would be appalled at the idea of doing.

It seems like its something that would be used for troubleshooting but i cant imagine they would put the silicone over it that would require ford to have to clean it in order to communicate with it but ford has done weirder things.

Anyone know the real origin of the ports purpose?
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Old 08-20-2014, 07:18 AM
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I believe that it's sole intended purpose was to flash the PCM the first time. They are assembled with no memory and once completed they are flashed and tested. Once passed they are completely dipped in an epoxy to protect the board for the environment. After that the port is left accessible make the PCM upgrade-able through firmware flashes. Since the factory can't know that a firmware flash is going to happen it's protected from corrosion. My '97 mustang has the same connection and it's never been flashed but it can be if Ford decided that it needed to be done.

Last edited by BigFuel; 08-20-2014 at 07:21 AM.
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Old 08-20-2014, 07:55 AM
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Quote:
Originally Posted by BigFuel View Post
I believe that it's sole intended purpose was to flash the PCM the first time. They are assembled with no memory and once completed they are flashed and tested. Once passed they are completely dipped in an epoxy to protect the board for the environment. After that the port is left accessible make the PCM upgrade-able through firmware flashes. Since the factory can't know that a firmware flash is going to happen it's protected from corrosion. My '97 mustang has the same connection and it's never been flashed but it can be if Ford decided that it needed to be done.
Hmm interesting, i suppoose if anyone would know it was you

Just spitballing but wouldnt they just flash the PCM through the OBD port. I know that OBD II was in its infancy in 1994 but i would think that that ability was there right?
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