2008 328xi,
Replaced faulty DME with stalling issue with a second hand unit from a 2011 328xi. Wrote SK to CAS. Cleared faults and adaptations. Car starts no problem.
Engine has loss of power.

FC 2fa4 incorrect data record
Test plan states CAS issue.

Programmed DME and CAS module to latest level.
Same issue. Re-installed original DME, downgraded CAS firmware, and wrote original ISN to CAS. Cleared faults and adaptations. No faults, engine runs fine.
Programmed original DME to latest level, same software version as donor DME. Still no issues. Reinstalled donor DME and wrote ISN again, same fault as before, and loss of power. How to correct?


Thanks,

This problem occurs when you mount a donor DME/DDE has a different power class than the CAS power class.
Unfortunately, these values are read only in the coding, you cannot match these values using manual coding.
The donor DME has no problem, it is fine and can be used on other car which has the same power class.
We are working on solving this issue, we may get a solution within 2 months.

Could you please elaborate how do we identify the power class?
Is that power class a number on the cas(c3, c4)?

Does the part number differ on diffent power class dmes?

Could you please elaborate how do we identify the power class?
Is that power class a number on the cas(c3, c4)?

Does the part number differ on diffent power class dmes?

In Autohex II manual coding of CAS , you can see an element called: Power class. Same in DME.
Both must have the same value.

hi has this issue been ressolved?

Hi

Any update on this issue?

When can we expect a solution or is it still work in progress?

Thanks

Based on information from one good member in our forum, the power class is located in an external eeprom.
Try to swap this eeprom.

On a 125I E82 has the 3.0 litre engine using MSV80
I flashed a 330I E90 software in DME and in CAS I changed power class to match with DME, and I'm still getting the incorrect data.
It looks like the software and power class in DME need to be checksumed... Unless a way to reset hours

Any other suggestions?

Thanks
Joe

Hi Joe,
Are you sure power class has changed in CAS?
Power class mismatching in the main reason, however there are other reasons to get this fault.
Incorrect data is a general fault, flagged when something is not matching between dme and other equuipments ( example: egs, dsc,....)

Hi,
Yes I was able to change power class in CAS, the way I did it is I found out the 335I e90 power class is changeable so I made a eeprom copy and did all the changes like VIN,keys,coded into the 125I CAS then edit power class.

A 2.5L uses Value 1, which 3.0l uses value 2
Im going to do further checks tonight just to make sure everything else is fine

Joe

No, both 2.5L and 3.0L uses the same power class of 2. One engine is N52B25 and the other engine is N52B30. 2.3L uses class 0 and 2.8L uses class 1 (although I did see one 2.8 before using class 0 as well)

You should never need to change power class in a CAS, provided the original CAS is used. If you change powerclass in CAS, you need to correct checksum when doing this and you must change the vehicle type code, else you'll never be able to code the CAS. Trust me, there's no good reason to change this in CAS unless you do a CAS swap (which should be a last resort)

Swapping the eeprom on the ecu is a proven method of sorting out the power class issue on the MSV80. I maintain a database of different ones that are localized for SA vehicles so I don't need the old ecu in order to swap an eeprom.

Gbyleveldt: you are great, thank you for this very valuable information and solution.

Well you guys did point me in the right direction 😉

I maintain a database of different ones that are localized for SA vehicles so I don't need the old ecu in order to swap an eeprom.

Do you by any chance have eeprom from F10 N53 528i or 530i? MSD 87.1 that would be.

I'm afraid I can't help there. I only have for msd/v 80,801,81,85

OK, no problem. Can you point at the type of eeprom MSD85 has? I can saw you a photo of MSD87 if you can help me.

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Have you looked on the other side of the PCB mate ?

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No mate...but I can do it tomorrow. Do you know what kind of eeprom it is? Brand, SSOP etc. ?

Gbyleveldt here is the pro who can answer your question.