Right-click the COM port → Properties → Port Settings tab:
| Setting | Value | Why for 2021 | |---------|-------|---------------| | Bits per second | 115200 | Default for MES (38400 too slow for 2021 CAN logs) | | Data bits | 8 | Standard | | Parity | None | Standard | | Stop bits | 1 | Standard | | Flow control | None | Hardware flow control breaks MES timing |
We will use Windows 10/11 as the operating system. The process is identical for MES 4.6, 4.7, and 4.8. multiecuscan elm327 port settings 2021
Different FCA vehicles use different pins and speeds. Here is the 2021 cheat sheet:
Go to Settings (or Options) and apply the following: Right-click the COM port → Properties → Port
By default, Windows 2021 enables "USB Selective Suspend." This will drop your ELM327 connection during a 20-minute proxy alignment.
As of 2021, Multiecuscan (MES) remains the gold standard for DIY diagnostics on Fiat, Alfa Romeo, Lancia, and Jeep vehicles. While the software is robust, the most common point of failure for users is the interface configuration—specifically the "Port Settings" when using the ubiquitous and affordable ELM327 adapters. Connect Timeout: Set to 2000ms or higher
Getting these settings right is the difference between a fully functional dealership-level tool and a frustrating paperweight. Here is a breakdown of how to configure your connection in the 2021 versions of the software.
Right-click the COM port → Properties → Port Settings tab:
Click OK.