Vida CEM swapping

[alevol]

but when i try with my Volvo XC70 2.5T 2003 (8688434)

You need a working keep alive for 2003 car. And cracker does not support so called CEM-B units.

[RickHaleParker]

You need a working keep alive for 2003 car. And cracker does not support so called CEM-B units.

You need a K-line keep alive on a CEM-B only if your connected to the CAN diagnostics ports. Connected to the other CAN ports and K-line keep alive is not needed. The reason a CEM-B disconnects from the J1962 connector when not in use is because unlike all the other CEM types, CEM-B is a end node. If the J1962 connector where to remain connected, the internal terminating resistor would not be at the physical end of the CAN bus.

No successful crack algorithm for the CEM-B.

[rednasdees]

Hello,

Great thread all off you guys, i read almost evrything that is on here

Would any of you be able to help me set up the software, because i have never used a teensy before :S ?
I have a teensy 4.1, with a mcp2515 for the canbus

i intend to use it on a volvo v50 from 2004

Thanks in advance !

[vtl]

You need CAN transceiver(s), we do not support standalone CAN controllers for ab long time.

[rednasdees]

oke, can you direct me to a good quality can tranceiver ?

[vtl]

oke, can you direct me to a good quality can tranceiver ?

It is mentioned on schematic: https://github.com/vtl/volvo-cem-cracke ... ematic.png Others may work as well, like Bosch CF160.

[oscilloscope]

very cool thread , although exhausting too read through approx 200+ posts. , to add this application needs to be able to evolve into being able to synchronise the ecu & cem on various versions.

[naxitrall]

Hi,

Im having a problem with P2 brick cem cracking.(part nr.8688513)
It wont read part nr or go to prog mode..

Have tried P1 and P2 CEM-L and then it works fine..

CPU Maximum Frequency: 600000000
CPU Frequency: 180000000
Execution Rate: 180 cycles/us
PIN bytes to measure: 3
CAN low-speed init done.
Reading part number from ECU 0x40 on CAN_LS
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
CAN_LS ---> ID=000ffffe data=cb 40 b9 f0 00 00 00 00
Can't find part number on CAN-LS, trying CAN-HS at 500 Kbps
CAN high-speed init done.
Reading part number from ECU 0x50 on CAN_HS
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
CAN_HS ---> ID=000ffffe data=cb 50 b9 f0 00 00 00 00
Unknown CEM part number 0. Don't know what to do.
Resetting all ECUs.
CAN_HS ---> ID=000ffffe data=ff c8 00 00 00 00 00 00
CAN_LS ---> ID=000ffffe data=ff c8 00 00 00 00 00 00

[alevol]

Check wirings

[naxitrall]

Check wirings

if i take same unit to other car then it works.. How it can be wiring?