Chip-Tools

ITDEENBGES

FBS4 engine ECU replacement with personalization data read from the original ECU (scenario 1)

This is the procedure to use when the original engine ECU can still be read: you save the FBS4 personalization data from the original and transfer it to the replacement ECU, so the vehicle starts normally. It is always the preferred method over personalization without data.

Procedure

1. With the original ECU still fitted to the vehicle, connect the AVDI over OBDII (CB106) and open the Mercedes FBS4 Manager.
2. Select the ECU section and press "Info" to establish the connection and read the unit; check the status reported.
3. Press "Save": the software reads the FBS4 personalization data and lets you save the file on the PC. Keep this file, it is essential for step 5. (Some units cannot be read over OBDII and require the dedicated bench connections described in the manual).
4. Fit the replacement ECU to the vehicle. If it is new or already virgin, skip straight to step 5.
5. If you are using a used donor ECU, press "Info" to read it and check its status, then press "Virgin" to bring it to virgin state. In most cases this is done over OBDII; some units are not covered over OBDII and have to be virginized on the bench.
6. Press "Personalize" and load the file saved at step 3. The procedure needs OBDII plus a direct CAN connection (blue CAN wires, CB012 cable or ZN051 DS Box). When the new screen appears, select the "standard" option.
7. When the procedure finishes press "Info" again and check the unit reports as personalized. The vehicle must start normally: "Activate" is not needed, because the unit activates itself after 100 ignition cycles while running normally in the meantime.
8. Last step: press the "VIN" button, type the vehicle's correct VIN in the window that opens and confirm writing it to the unit.

Reference screenshots