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So Bench Wiring a ford controller, but I have seen this terminology elsewhere I believe with various memcal & NVram diagram's.

So all the obvious 1's are Ign, Batt, Ground, Can+, Can-, Data etc...

But what does VPP stand for & what does it want to see?

From my understanding with the issues I've had it needs this powered when trying to access the data on the eeprom, so what sort of power does it want & when?

I think is the line that set with a high voltage (relatively speaking) during programing.

It depends on the context, but either Voltage programming power ((e)eproms/flash) or Voltage peak to peak (analog wave forms). But essentially a power supply.

Ahh cool thanks, yeah it's just got vpp without context, but been told it needs to be 12 to 18v being sent back to the ford controller to allow read/write.

Thanks again

It's just a bit weird to know when to give the VPP the power, as if you give it power when intializing he controller it fails, but if you give it the power just after confirming the VIN after 3 second switc off to get in to bootloader then it's o.k.?

Its probably by design to stop it entering certain modes accidentally. Also its probably supplied to the write pin on the flash chip and > 12v < 18v DC is probably the specification for the flash chip.

yeah this wire, the hptuners interface is supposed to send the voltage down this wire to pin 13 of the obd port when it wants to write, which is wired to the vpp on the flash chip. had the problem of not having that wire connected on a falcon standalone setup once before.

Yeah seems strange, the hpt dongle must have sent the feed to it the first time you told me about it but yesterday I had to manually send the power back to the pin 39 of controller!