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ITDEEN

Simos PCR2.1: unlocking the ECU and reading PIN/CS/MAC

The "Simos PCR2.1" special function is used to read the PIN/CS/MAC of Simos PCR 2.1 engine ECUs. The procedure has three stages: unlocking the ECU, preparing it for reading via a software update, and reading it over OBDII.

Procedure

1. Stage A - unlocking: the ECU can only be read after the EEPROM has been unlocked into so-called "developer mode". You can do this in two ways: by reading/writing the EEPROM with a programmer, or via boot-mode. The drawback of the programmer route is that the EEPROM sits on the underside of the ECU, forcing you to strip the whole housing, whereas the boot-mode connection is far simpler.
2. Unlocking with a programmer: read the EEPROM (95640) with the programmer.
3. Press the "Generate UNLOCKED Simos ConfData dump (95640)" button to generate the new dump.
4. Write the modified dump with the programmer: once written, the ECU is unlocked.
5. Unlocking via boot-mode: connect the ECU as shown in the wiring diagram.
6. Press the "Lock/Unlock by boot-mode" button; if it cannot connect to the ECU, power the ECU off and back on and try again.
7. Check with the "Check ECU status" button: if "ECU is unlocked and now can be prepared for reading" is active, the ECU is unlocked; if "ECU is already unlocked and prepared for reading" appears, the PIN/CS has already been read in the past and no further preparation is needed.
8. Stage B - preparing for reading: this is done by updating the ECU software. Select the SW version to update to from the program's internal database; in most cases the correct version is selected automatically, otherwise pick it manually.
9. Stage C - reading: with the ECU prepared, read the PIN/CS/MAC over OBDII. If the ECU is already prepared you can go straight to this last step, and the PIN/CS/MAC read can also be done from the "Immo parts adaptation" and "Engine control unit" special functions.

Reference screenshots