Memcal Burning Not Starting The Car

[Rhysk94]

Was the VS N/A Enhanced
VX L67 Enhanced
VY L67 Enhanced

[antus]

I just checked VX_V6_SC_$A5K_Enhanced_v1.3f and the bin has AA at 0x2008 and it remains AA when I edit it with the included XDF. Which byte are you changing to AA to make them work in the memcal?

[Rhysk94]

I just checked VX_V6_SC_$A5K_Enhanced_v1.3f and the bin has AA at 0x2008 and it remains AA when I edit it with the included XDF. Which byte are you changing to AA to make them work in the memcal?

Literally the checksum scalar down the bottom of the xdf's in category view

[antus]

Well that explains it. So the program ID is at 2008, and I thought setting that to AA disabled the checksum check. I am not sure when that changed, but at least for the VX SC and maybe all the PCM tunes, I guess that does not disable the checksum, and the code is indeed testing if its running from an NVRAM and skipping the sum if it is, so that you can realtime tune and still re-start the car. The text in a prior thread says that the XDF still calculates the checksum so you can still use it if you want. I guess that means that you need to set it to AA like you are by hand. I havnt tested when it updates from the XDF. So the checksum is actually 16bit, and just before the program ID which most of us are looking at and seeing the AA. That is really good to know what you found, thanks!

[immortality]

I'll have to check the Faq for these tunes. I use Enhanced tunes without NVram and never have to change the checksum.

[antus]

Something is still not quite adding up here, because the XDF should update the checksum correctly. So we know the Program ID and the 2 byte checksum are not the same thing, and its not the same as the MAP PCMs. I just changed a few things, hit save, then closed and re-opened the checksum window in TP and the checksum has changed from 0751 above to 0783, so it appears to be working properly. It sounds like it is not updating or not updating correctly for Rhysk94 for some reason. There is no plugin here, like there is for the VPW PCMs, so its not the same fault as people often have with those ones - not having the correct plugin installed.

[Rhysk94]

Yeah its weord, but the fact it has happened to 3x cars now is what baffles me.
When I save it it saya chekaum updated too.

[delcowizzid]

Read the nvram with the programmer and then burn the file to eprom and it should just run. If using eeproms use erase as ff

[Rhysk94]

I tried that as well
Still didn't work.
It works manually each time setting the checksum to AA. I'll just keep doing that to save myself some time with have to re erase the memcals

[Rhysk94]

The saga continues, burnt a no vats chip for a customer (l67 swapped a VS ute) disabled vats and set the checksum to AA.
Car has no injector pulse.
Starts on his factory memcal but obviously doesn't run right with the injector difference.
Im going wrong somewhere with all this
Tunerpro states checksum updated when I save the file.
I just used the1's enhanced VS L67 file and disabled vats.