Vida CEM swapping

[daniel84uk]

Firstly, thank you to the creator of the tool and those that contributed.

Anyone have idea why it intially reads the ECU part number correctly to then fails a few minutes later with "unknown cem part number 0" ?

Im assuming my wiring is correct as it initially reads the correct part number 31254749?

My car is facelift 2010 volvo c30 1.6D

using Christian Molson one_pass as suggest for P1 somewhere in this thread
https://github.com/cmolson/volvo-cem-cr ... e/one_pass

Tried in position 0 and position 1.


Im going to experiment more after sleeping maybe try the main branch, and check dice / vida works in 0 person.

Kind regards.

[daniel84uk]

Tried the master branch. Same. It, gets to "99:..." stops, tries to read the part number second time. Fails and rests the ecus.
It seems to go into programming mode fine. The lights flicker and you hear a noise. After the ecus are rest the car clock is reset --:-- .

VIDA / DICE connection is fine to cem in 0 key position.

A few things worthy of note. Ever since ive own the car from 2019, ive had error code "CEM-3A00 ECM Softwate faulty signal" with absolutely no symptoms. Maybe this is my problem, a previous owner has modified the firmware. I suspect he may have had the DPF written out and i have a dummy, i remember he mentioned he has issues with it and a garage did something. Maybe this prevents CEM Cracker procceding?




Also my car has keyless entry and start, dont know know if that would make a difference or not.

[dikidera]

Yes a modified ECM firmware can most definitely produce these codes, but I've often found it doesnt really affect vehicles.

[oscilloscope]

Tried the master branch. Same. It, gets to "99:..." stops, tries to read the part number second time. Fails and rests the ecus.
It seems to go into programming mode fine. The lights flicker and you hear a noise. After the ecus are rest the car clock is reset --:-- .

VIDA / DICE connection is fine to cem in 0 key position.

A few things worthy of note. Ever since ive own the car from 2019, ive had error code "CEM-3A00 ECM Softwate faulty signal" with absolutely no symptoms. Maybe this is my problem, a previous owner has modified the firmware. I suspect he may have had the DPF written out and i have a dummy, i remember he mentioned he has issues with it and a garage did something. Maybe this prevents CEM Cracker procceding?




Also my car has keyless entry and start, dont know know if that would make a difference or not.

i have only ever seen CEM-3A00 ECM when there has been a tune placed on the ecu and there's a checksum mismatch.

[daniel84uk]

Hi both.

If there was a tune its definitely not for performance reasons Its a bloody slow car. Id bet its DPF related. Id have assumed a failed checksum would prevent start. However the error has been there at least 6 years and counting and ive had no problems.

So it looks like the cem cracker script gets no response to latency checks for all the first byte checks, then maybe fails some compassion checks as they are all zero. Then tries to connecting to the cem a second time, but as its already in programming mode so fails to see the cem PN on the second check, or fails to see PN from without programming mode.

[Dudde]

If there was a tune its definitely not for performance reasons Its a bloody slow car. Id bet its DPF related. Id have assumed a failed checksum would prevent start. However the error has been there at least 6 years and counting and ive had no problems.

The checksum dtc is just that the new calculated checksum in ECM after tune does not match the stored checksum in CEM for the original software

[Skavac]

Hey everyone,

Anyone used Xprog to read CEM L (M30855F, serial 00005 onwards) ?
IO Terminal failed to flash the CEM.

I used the following diagram to connect Xprog to CEM L.
But when I try to read, I get error (Communication Error 1)

I am using Xprog Clone 6.50. I used this to read P3 CEM many moons ago, so I am sure the Xprog works

Any idea to where I should look?

Original xprog works fine, what failed with io terminal?

This I am not sure. I flashed it in car, it stopped halfway. I get an error about could not find CAN_RX Frame, and the CEM was no longer working. Only check engine light on, no communication with VIDA or IO Terminal

[oscilloscope]

Hey everyone,

Anyone used Xprog to read CEM L (M30855F, serial 00005 onwards) ?
IO Terminal failed to flash the CEM.

I used the following diagram to connect Xprog to CEM L.
But when I try to read, I get error (Communication Error 1)

I am using Xprog Clone 6.50. I used this to read P3 CEM many moons ago, so I am sure the Xprog works

Any idea to where I should look?

Original xprog works fine, what failed with io terminal?

This I am not sure. I flashed it in car, it stopped halfway. I get an error about could not find CAN_RX Frame, and the CEM was no longer working. Only check engine light on, no communication with VIDA or IO Terminal

what did you flash with what? xprog clone ?

[vtl]

Firstly, thank you to the creator of the tool and those that contributed.

Anyone have idea why it intially reads the ECU part number correctly to then fails a few minutes later with "unknown cem part number 0" ?

Im assuming my wiring is correct as it initially reads the correct part number 31254749?

My car is facelift 2010 volvo c30 1.6D

using Christian Molson one_pass as suggest for P1 somewhere in this thread
https://github.com/cmolson/volvo-cem-cr ... e/one_pass

Tried in position 0 and position 1.


Im going to experiment more after sleeping maybe try the main branch, and check dice / vida works in 0 person.

Kind regards.

31254749 is what sirloins (Christian) had, it should work. Both CAN buses are wired well? In-car cracking needs both buses to go into programming mode, otherwise the modules will still be sending packets that will interfere with the cracker.

[mechanikas]

Hello, why when i try connect to volvo v70 cem i get this timout error?