Flashing 7.2, 7.8 DME vs 5.2.2

[logray]

I'm 99.999% certain on this, however... just to be 100% certain.

Can anyone confirm this?

On a DME 5.2.2, you need to apply 12v to pin 12 OBD (pin 60 DME) during flash.

However 7.2 and 7.8 do not have this requirement, correct?

Thanks!

[Richard Hamilton]

That's correct. It is only on 5.2.2 that you have to apply the programming voltage.

[logray]

Thanks as always Richard!

I looked through some of the wiring diagrams and this pin seems to be absent from future DME versions. In addition, I remember being told this by a DME software engineer, but just wanted to be absolutely certain since I haven't flashed a 7.2 or 7.8 myself.

[coleta]

Logray, do you know at what point is the 12v applied to pin 12 during the programing and for how long?

[logray]

PM sent.

[Loren]

Folks if you have the proper Porsche PST2 cable this is all taken care of by the cable/PST2.

[logray]

I thought the same, but got very deep into this issue including verifying pin for pin the cable I have with the Porsche PST2 cable, in the the end the cable I have is the identical cable and part to what Porsche sells. What the issue probably boils down to is you actually need the proper PC card for this particular voltage. Of course, this only applies to the ME5.2.2.

My feeling and research is that Porsche very tightly controlled the actual PST2 PCMCIA cards and the cards don't go far from the original PST2 units (if they do they probably just went back to Porsche instead of finding their way into a laptop or KTS500). In other words any clone unit is almost certainly not using the Porsche PC card and thus does not have the circuitry for (or does have it, but the firmware on a "ISO" card does not recognize the command to apply) this voltage.

In any case, having used the KTS500 PST2 for many years doing just about every other coding or diagnostic function, this was the only hiccup I ran into, which I was able to overcome (with some help from several bright individuals on this board of course).

:)

Edited October 13, 2011 by logray

[coleta]

Awesome. Thanks. This DME engineer posted all this info on this site? Or it was someone you knew?

[logray]

Third party software vendor... one of the ECU tuners ...

[Richard Hamilton]

I think that if the cable is wired correctly then it should be possible to flash the fuel map without an extra supply to pin 12. Logray, I will PM you with a wiring diagram you can compare to your cable.

[logray]

Thanks! I haven't had time to compare yet but will within the next few days...

That being said, the part number on my cable is exactly equivalent to the Porsche P/N (interchangeable). I'll dig up the thread later.

In addition, I've verified pin for pin the cable is exactly the same with another person who owns (several) PST2's.

Edited October 14, 2011 by logray