Vida CEM swapping

[vtl]

just an update, worked perfectly, got 909/s speed, took about 4:30hrs to crack a p3 cem from a 2014 v40, trying a 2016 v40 tomorrow, im thinking of doing a little wiki write up about this info etc does anyone mind? just some bench info and how to find and use the p3 branch as the info is spread about these 250 odd pages

Sounds like an excellent idea! Are you planning to populate the wiki tab of the github project?

[Jackw16]

just an update, worked perfectly, got 909/s speed, took about 4:30hrs to crack a p3 cem from a 2014 v40, trying a 2016 v40 tomorrow, im thinking of doing a little wiki write up about this info etc does anyone mind? just some bench info and how to find and use the p3 branch as the info is spread about these 250 odd pages

Sounds like an excellent idea! Are you planning to populate the wiki tab of the github project?

I'd definitely be happy to do that i was planning on just setting up a wiki website for it but i would make much more sense if its right next to the github project

[vtl]

I'd definitely be happy to do that i was planning on just setting up a wiki website for it but i would make much more sense if its right next to the github project

You can fork the project, work on the wiki and then submit a pull request, I'll merge it.

[volvofrank]

Hi there, I am a total electronics noob here, lurking this entire thread.

I am trying to make an "easier breadboard" version of vtl's work (which is awesome!).

So this is my take.

I am worried about how I handle the GND.

(I put some colors in the lines to make it a bit easier to see, they have no meaning;
I also put some thickness in the lines going to the OBD connector, also no meaning ).

This is what I have come up with so far:

Image1.png (57.81 KiB) Viewed 729 times

Also this is the VP230 board I am using:

SN65HVD230-VP230-CAN-Board-Network-Transceiver-Evaluation-Development-Module-For-Arduino-Controller-Board-DC-3V-3.jpg_Q90.jpg (15.56 KiB) Viewed 729 times

And this is the buck converter:

Ultra-Small-Size-DC-DC-Step-Down-Power-Supply-Module-3A-Buck-Back.png (15.23 KiB) Viewed 729 times

Ultra-Small-Size-DC-DC-Step-Down-Power-Supply-Module-3A-Buck-Front.png (18.59 KiB) Viewed 729 times

Will the version of my schematic work?
Or do I need to handle GND otherwise?

I also would appreciate it if someone can verify everything if I didn't mess up anything else.

[Jackw16]

I'd definitely be happy to do that i was planning on just setting up a wiki website for it but i would make much more sense if its right next to the github project

You can fork the project, work on the wiki and then submit a pull request, I'll merge it.

just written up a simple wiki for now but turns out you cant pull request a wiki, let me know how to proceed, my fork with the wiki is here (https://github.com/jackw163/volvo-cem-cracker) links wont work as the urls are set for your main branch

[bobbik]

Guys , i remind that i have Smok tool, which changes mileage (both, CEM and DIM ) via obd . Sniff it at work could be interesting

[dikidera]

And I am happy to share news, the Dumper I wrote for Denso dumps 256kb of external maps in around 15s, but there is room for improvement and between 10 and 11 bytes could be sent per CAN message and thus save a few more seconds.

[prometey1982]

Wow thats very fast. I'm dumping TCM flash with read data by addr command in 20-30 mins. But it's just single operation so such amount of time isn't a big problem. Also DIM can be dumped with this command.

[dikidera]

Yes the SBL I wrote is dead simple, all the values(memory address and size) are hardcoded so not much logic in there, but the hard part was ensuring it works, because I encountered some issues with how the code worked vs emulated in HEW and GhidraEmu.

Meanwhile I would like to ask if you guys know how the DIM gets information about the fuel? On my bi-fuel model, the gasoline level is shown in the small display on the left with squares(precision is 3.5 liters so it's not accurate), and the traditional fuel gauge with the needle shows lpg/cng level. I want to reverse them and have the needle show gasoline levels. I am really hoping it doesn't require CEM reprogramming, but if need be...I will.

[prometey1982]

Yes the SBL I wrote is dead simple, all the values(memory address and size) are hardcoded so not much logic in there, but the hard part was ensuring it works, because I encountered some issues with how the code worked vs emulated in HEW and GhidraEmu.

Have you made position independed code? Or placement by address?