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Right-click your USB Serial Port in Device Manager and select Properties. Go to the Port Settings tab.
To help you get the best connection, what car model and year are you working on?
If Multiecuscan displays a "High Latency" warning during the test, return to Device Manager. Ensure no other programs are using the COM port and that your laptop is plugged into power; some "Battery Saver" modes can throttle USB port response times.
Set Bits per second to 38400 (most stable) or 115200 (high speed). Click the Advanced button. Find the Latency Timer (msec) setting.
Once the hardware is tuned, match the settings inside the Multiecuscan application. Open Multiecuscan and click Settings (F12). Navigate to the Interfaces tab. Select Interface Type: ELM 327 (USB/Bluetooth/WiFi). Select the correct Serial Port (matching Device Manager). Set the Speed to 38400. Click the Test button.
If the interface is detected but cannot connect to specific modules like ABS or Power Steering, consider these factors: The 120-Ohm Resistor Problem
Look for "USB Serial Port" and note the COM number (e.g., COM3). Critical Windows Port Configuration
For most Alfa Romeo, Fiat, and Lancia models, the ELM327 alone isn't enough. You will often need a "Yellow Adapter" (Adapter 3) to bridge the pins required to talk to the CAN network modules. High Latency Warnings
