Vida CEM swapping

oscilloscope · Post by **oscilloscope** » 22 Oct 2022, 17:10

Furthering on with the wiring changing to 30awg on the transmission lines.

It remains to be seen If it works. , I haven't checked the other cem but it's worth ago once again. Just encase

oscilloscope · Post by **oscilloscope** » 22 Oct 2022, 23:56

oscilloscope wrote: 22 Oct 2022, 17:10 Furthering on with the wiring changing to 30awg on the transmission lines.

It remains to be seen If it works. , I haven't checked the other cem but it's worth ago once again. Just encase

20221023_002505.jpg

Something very odd happened lastnight during testing, I had it all connected up with the alternative wires , but tiredness prevailed, and I didn't switch on the power supply. But the cem cracker was working away as if it was on and reckoned it was working through the cem.

Post by **RickHaleParker** » 23 Oct 2022, 06:07

oscilloscope wrote: 22 Oct 2022, 23:56 But the cem cracker was working away as if it was on and reckoned it was working through the cem.

Look at the schematic. The transceivers are connected to the USB 5V. It powering off the USB. You don't need an external power supply for just CAN Bus. K-Line would be a different story but the CEM-B is still uncrackable and we found a way around the K-line if anybody does ever come up with a crack that works on the CEM-B.

oscilloscope · Post by **oscilloscope** » 23 Oct 2022, 06:34

RickHaleParker wrote: 23 Oct 2022, 06:07
oscilloscope wrote: 22 Oct 2022, 23:56 But the cem cracker was working away as if it was on and reckoned it was working through the cem.
Look at the schematic. The transceivers are connected to the USB 5V. It powering off the USB. You don't need an external power supply for just CAN Bus. K-Line would be a different story but the CEM-B is still uncrackable and we found a way around the K-line if anybody does ever come up with a crack that works on the CEM-B.

That's fine , I wasn't sure what vtl ment if there was something else I was suppose to use. , I have indeed powered the transceiver modules i have with the teensy.

Which one is the cem-b The brick style one ?

oscilloscope · Post by **oscilloscope** » 23 Oct 2022, 07:33

Excellent

The £20 quid cem was able to be cracked. , my next task to see If it works in IOT terminal

XCGuy · Post by **XCGuy** » 23 Oct 2022, 17:12

Good job

really helpful tool.

oscilloscope · Post by **oscilloscope** » 25 Oct 2022, 14:56

RickHaleParker wrote: 23 Oct 2022, 06:07
oscilloscope wrote: 22 Oct 2022, 23:56 But the cem cracker was working away as if it was on and reckoned it was working through the cem.
Look at the schematic. The transceivers are connected to the USB 5V. It powering off the USB. You don't need an external power supply for just CAN Bus. K-Line would be a different story but the CEM-B is still uncrackable and we found a way around the K-line if anybody does ever come up with a crack that works on the CEM-B.

Do you mean via an open source obdii reader where the k-line source code is freely available?

Post by **vtl** » 25 Oct 2022, 16:16

You can connect to CAN via REM, etc, where k-line keep alive is not necessary.

BTW, the cracker supports k-line, just needs a chip and a couple of resistors. Mine has it.

oscilloscope · Post by **oscilloscope** » 26 Oct 2022, 00:24

vtl wrote: 25 Oct 2022, 16:16 You can connect to CAN via REM, etc, where k-line keep alive is not necessary.

BTW, the cracker supports k-line, just needs a chip and a couple of resistors. Mine has it.

Would that mean it can support the older brick style cem ? With the correct supporting ic and Resistors?

Post by **RickHaleParker** » 26 Oct 2022, 22:48

oscilloscope wrote: 23 Oct 2022, 06:34 Which one is the cem-b The brick style one ?

Yep ... 1998 - 2004 P2. I could not come with a official name for it so I named it CEM-Brick.