This post is available with user guide of OBDSTAR MT203 CAN Driver/Gateway Simulator.

You will learn about the appearance, function, Gateway Simulation demo, and CAN Drive function.

Part 1: OBDSTAR MT203 Appearance and Interfaces

It features a DC 12V power supply interface to power both the device and the ECU. There’s also a 120Ω terminal resistor. If your ECU does not have one, it needs to be turned “ON”.

The wiring splits into two paths.

These four wires representing positive and negative power, CAN high and CAN low.

One path connecting to the ECU and the other connecting to the diagnostic tool connector

Part 2: Function Description

MT203 allows us to diagnose modules individually on a workbench, eliminating the need to connect to the original vehicle gateway or reinstalling the module back into the vehicle. It is versatile and can handle multiple ECUs, performing diagnostics and reading fault codes among other operations.

Part 3: Gateway Simulation Demo (Kia Sorento Instrument)

First, connect the power supply and the ECU (need to find the connection definitions yourself), and then connect the Bluetooth connector.

There are gateway and CAN drive functions.

The gateway function supports automatic scanning of standard CAN and fault-tolerant CAN, but does not support automatic identification of CAN FD.

Users can manually select standard CAN, fault-tolerant CAN, CAN FD, etc.

Common baud rates are available for quick selection. If don’t have, the custom baud rates can be set. The diagnostic tool defaults to 500K.

The 2020 Kia Sorento instrument demonstrated today uses the CAN FD protocol.

Find the protocol and select 2M baud rate.

The cycling of the three dots indicates a successful simulation.

You can now use the diagnostic tool to read ECU information and fault codes, enabling off-vehicle module diagnostics.

Part 4: Gateway Simulation (Mitsubishi Airbag ECU)

Mitsubishi Airbag ECU uses fault-tolerant CAN, which can be manually selected or automatically recognized.

Press "ENT" to scan automatically, and the scanned ECU is 83K

The cycling of the three dots indicates a successful simulation.

You can now use the diagnostic tool to diagnose the airbag and read fault codes, etc.

If the automatic identification fails, manually select fault-tolerant CAN and choose from common baud rates.

If don’t match, select custom settings while keeping the diagnostic tool at 500K, and setting the ECU to 83K.

You can now use the diagnostic tool to read ECU information and fault codes, enabling off-vehicle module diagnostics.

Pressing "ENT" and proceeding to read fault codes for module diagnosis.

Besides gateway simulation, there's also a CAN drive function to test common modules like gearlever, radio, air conditioning and EBA system.

Part 5: CAN Drive Function

This function works in conjunction with OBDSTAR app where communication definitions for these modules can be found.

That’s all for our sharing on the functions of the MT203 CAN driver/Gateway simulator.

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