The process is slightly different for Bluetooth users. You must pair the ELM327 in Windows Bluetooth settings first. Once paired, Windows creates an outgoing COM port. In MultiECUScan's interface settings, you must manually select this specific COM port and set the baud rate to 38400. Make sure to disable the "Automatic port list" feature to avoid conflicts.
If you’re using Multiecuscan with an ELM327 adapter (2021 setup), use these settings for reliable connection and diagnostics:
If you are using a modified ELM327, you may not need the colored cables for some modules, but for others (like Body Computer) you still will. Select "No" to the warning, or, if you know you don't need it, disable the warning in the settings.
Note the assigned (e.g., COM3) for later use. Click OK to save and close all windows. Step 2: Configuring Multiecuscan Settings multiecuscan elm327 port settings 2021
Connects to Engine, ABS, Power Steering, and Climate Control.
Look for entries like FTDI USB Serial Port , CH340 Serial Port , or Prolific USB-to-Serial . Note the assigned COM port number (e.g., COM3).
Connecting your ELM327 interface to Multiecuscan can sometimes result in frustrating connection timeouts, "Interface Not Found" errors, or sluggish data refresh rates. Most of these issues stem from incorrect Windows COM port configurations rather than hardware faults. The process is slightly different for Bluetooth users
| Problem | Likely Cause | Solution | |---------|--------------|----------| | "CAN bus error" | ELM327 clone with wrong firmware | Use OBDLink SX or STN1170-based interface | | "SW-CAN not responding" | No internal termination | Enable "SW-CAN with 120 ohm" in MES settings | | "Connection lost after 10 seconds" | Windows USB selective suspend | Disable in Power Options → USB settings | | "UDS timeout" | Wrong baud rate (try 115200) | Set interface baud to 115200 in MES + matching driver | | No airbag module | 2021 uses crash CAN on different pins | Use MES Adaptor cable #2 (pins 1&9) |
MultiECUScan relies on an electronic hardware interface to translate the car’s CAN-bus language into USB data your laptop can understand. The ELM327 is the industry-standard microchip used in most OBD-II diagnostic cables. Modern computers rarely have physical serial ports, so your ELM327 USB cable creates a virtual COM port in Windows. Although physically connected via USB, the operating system treats this as a legacy serial connection, requiring specific attention to port number assignment and data flow timing to prevent errors.
Set this to 38400 or select the option to have the software detect it. Select "No" to the warning, or, if you
Click the Test button within the Multiecuscan settings window.
: Most ELM327 v1.3/v1.4 interfaces require a speed of 38400 . Some newer v2.1 or high-speed interfaces might use 115200 . ⚙️ MultiECUScan Software Configuration
This is the most crucial step for MultiECUScan. Click the Advanced... button.