After 6 months of silence, I thought this project was dead, . Or mutated to a commercial release.

And now it exploads. You should have gotten some strong motivation to finish the job.

I read...

I see your bigest obstacle is the flash routine.
Can you add an option for user provided flash routine with some small config file containing data as seed/key algo used and some basic stuff as...

I can get you any vpw factory flash write routine + basic commands list and seed/key algo number by a vin number.
The offset address the bin starts and the chunk size.
All you have to do is figure...

I was looking for some flash chips and stumble upon this link.
https://www.ebay.com.au/itm/LS1-PCM-FLASH-TOOL-VT-VX-VY-VZ-COMMODORE-V8-COMPUTER-5-7-MAFLESS-OTR-TUNING-VATS-/162108316648

The...

If you make it compatible with the avt commands, that will open a whole lot of opportunities for using it with a software like dhp and some other popular stuff.
The basic commands are not that much...

A VPW bus operates in two states:• Active — In the active state, the bus is driven between 6.25 V and8.00 V.• Passive — In the passive state, the bus is pulled down to between1.5 V and 0 V.



...

Here are some useful links for anybody that wants to build a custom interface for VPW bus.

https://forum.macchina.cc/t/support-for-j1850-vpw-pwm/67/34...

I was almost sure you had used some cheap vpw transiever like motorola 33990 or similar auto grade one.
It is waste of time and effort to turn the arduino in software transiever when you can hook a...