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MCM and ACM generations

    2020-01-28


Information about MCM and ACM (Mercedes SFTP MP4 EURO6 trucks ECU).

There are released many different versions of MCM and ACM ECU's.
* MCM
* MCM2
* MCM2.1 not locked
* MCM2.1 locked (from 2016/4 - up 2019/04) (HW: D2; HW: D3)
* MCM2.1 locked (from 2019/04 - up today) (HW: D4)    -  NOT SUPPORTED BY VEI
* ACM2
* ACM2.1 not locked
* ACM2.1 locked (from 2016/04 - up 2019/06) (HW: D2.x; HW: D3)
* ACM2.1 locked (from 2019/06 - up today) (HW: D4)


Truck Explorer Licenses coverage for a read/write function with VEI and DirectConnect 2 tool:

1. License MCM BSL:
* MCM
* MCM2
* ACM
* ACM2
* ACM2.1 not locked

2. License MCM OBD:
* MCM

3. License MCM2 DC:
* MCM2

4. License MCM2 OBD:
* MCM2

5. License MCM2.1 BSL:
* MCM2.1 not locked
* MCM2.1 locked (HW: D2.x; HW: D3) - need to open ECU

6. License MCM2.1 DC:
* MCM2.1 not locked
* MCM2.1 locked (from 2016/04 - up 2019/04) (HW: D2.x; HW: D3)

7. License MCM2.1 OBD:
* MCM2.1 not locked
* MCM2.1 locked (from 2016/04 - up 2019/04) (HW: D2.x; HW: D3)

8. License ACM2 DC:
* ACM2

9. License ACM2 OBD:
* ACM2

10. License ACM2.1 DC:
* ACM2.1 not locked
* ACM2.1 locked (from 2016/04)

11. License ACM2.1 OBD:
* ACM2.1 not locked
* ACM2.1 locked (from 2016/04)

The deference between OBD, BSL and DC modes:

OBD mode: is a software mode by diagnostic port OBDII.
Advantage: Fast - 5 minutes.; No need to disconnect or open ECU.
Disadvantage: Could not read damaged ECU.

BSL mode: is a Boot Strap Loader mode. (Safe mode for ECU).
Advantage: Could read/write damaged ECU. No need to open ECU
Disadvantage: Slow mode. 30 min to read or write

DC mode: is a normal software mode.
Advantage: Fast - 5 minutes.; Reads MCM2.1 locked and ACM2.1 locked. No need to open ECU.
Disadvantage: Could not read damaged ECU.


The main disadvantage for locked ECU:
If you will damage your locked ECU, it will be NOT possible to rewrite (repair it).
It does not have BSL mode.
MCM2.1 locked and ACM2.1 locked version not have BSL mode at all !!!
Only our engeeners could repair locked ACM2.1, or MCM2.1. Please contact us.


How you could damage ECU:
- if you prevent write operation;
- if you disconnect DC2 at write operation;
- if your power supply (or truck battery) is a very bad condition;

Use these functions at your own risk!

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