Set the to 38400 . If your interface uses a high-quality FTDI chip and supports it, you can later test 115200 for faster data refresh rates. 4. Testing and Validating the Connection
If you are working on a newer Fiat/Alfa Romeo (typically 2018 or newer), the vehicle may feature a SGW (Security Gateway) module. You will need a standard SGW bypass module to act as a bridge between the ELM327 cable and your car's port to clear codes.
Click "Test" to ensure the software communicates with the cable. 3. Essential Adapter Cables (Post-2021 Requirements)
Under Interface Type , select depending on your exact cable specification. Port Synchronization multiecuscan elm327 port settings 2021
: Cheap or poorly manufactured ELM327 clones often contain a misplaced resistor ( termination resistor) between pins 6 and 14.
| Parameter | Setting | |-----------|---------| | ELM327 Interface Type | or ELM 1.5+ | | Connection Type | USB (not Bluetooth for 2021) | | COM Port | Match device manager | | Baud Rate | 115200 | | Fast Baud Rate (CAN) | 500000 (for 2021 HS-CAN) | | Fast Baud Rate (CAN FD) | 2000000 (for 2021 Fiat 500 Hybrid) | | Check “Use D-PDU API” | Only for 2021+ supported adapters (e.g., OBDLink EX) | | Check “Low Latency Mode” | Enabled (forces 1 ms timer) |
In the Interface drop-down, select the exact COM port number you assigned in the Windows Device Manager (e.g., ). Set the to 38400
After installing the USB driver for your ELM327, go to .
Most high-quality ELM327 USB cables use FTDI or CH340 chipsets.
Right-click on the Windows Start button and select Device Manager . Testing and Validating the Connection If you are
Attempting to use MultiECUScan without correctly configuring your COM port settings in 2021 is a recipe for "Connection Failed" errors, "ELM327 Not Responding" messages, and corrupted vehicle modules.
Many cheap generic ELM327 clones contain a misplaced termination resistor between CAN lines (pins 6 and 14). If you can connect to the Engine ECU but cannot read the Body computer, CAN network, or Dashboard, you may need to open the plastic shell of the ELM327 and physically desolder/remove the 120-ohm resistor (R12 on most circuit boards).
Ensure the ELM327 is plugged into the computer (vehicle connection is optional for this specific test).
Once Windows handles the hardware communication timing, you must mirror these parameters inside Multiecuscan. Interface Selection Launch Multiecuscan. Click (F9) from the main menu. Navigate to the Interfaces tab.