VATS delete

[yoheer]

Gampy, everything is exactly as you said.

[Gampy]

Awesome ... I Thank you, and I suspect there are many many silent Thank You's to come from those whom read this thread!

You are aware the scary (dangerous) part is done ??
The OS change. (Actually the boot segment change is the dangerous part) ...

Now all you need to do is Calibration writes ... They are pretty darn safe and PcmHammer has pretty good recovery code if a Calibration write were to fail.

In fact, people have unplugged the PCM during a Calibration write just to test PcmHammer recovery code.
I personally have intentionally corrupted the Calibration segment as well as deleting it to test PcmHammers recovery and it has worked flawless for me.

But I do understand the concern, however the more you understand the less concerned you'll become, also if you can find a good deal on a spare Pcm that helps a lot as well.

Thank you
-Enjoy

[yoheer]

I know that OS change is dangerous. I understand that If i'll get bricked, then I'll have to desolder the memory chip, throw it to tl866 to reflash directly and then get it back to ecu. I've made it in my 94 trans am. The ecu is obd1 and it differs from p01 and p59, but the procedure is the same.

[Gampy]

Actually there is a device called USB BDM NT that allows P01/P59 to be flashed onboard through Background Debug Mode, no desoldering!

I have one and it has saved my butt a few times while doing things I shouldn't, I have headers for it installed in all my test PCM's.

[yoheer]

Tl866ii supports ICSP programming. Can I do it with this device?
Where is the manual how to do it?

[antus]

no, its a parallel part, BDM uses the processors 'background debug module' to get the processor to run the flash through its parallel pins. There is a thread about it which I will link to the middle of here: viewtopic.php?f=42&t=6215&hilit=usbbdmn ... =70#p99102 the product is from https://www.usbjtag.com/usbbdm.php

I think in your case the reliability is likely something in your car talking on the bus when it shouldnt. If you go the wreckers you could buy headers for the pcm and make up a bench adapter to bench flash. For problem vehicles that tends to improve reliability a lot. You can also buy the connectors and pins online new. Alternativly, you could pull some fuses in your car while doing a read all, and watch the results and see if the retrys stop happening with a particular fuse out. Doing this while its reading would be safe. But you may be able to identify which circuit has the bad device on it, and you can then pull the fuse while you are reading or writing the pcm to improve reliability.