GODIAG GT100 is a professional OBD II Break Out Box interface designed for technicians, auto electricians, workshops, and advanced users who require fast diagnostic testing, identification of OBD2 communication lines, direct connection to the ECU, and voltage checking at the diagnostic port.

The device functions as an intermediary platform between the vehicle, the tester, and the ECU modules, providing easy access to the relevant pins and a clearer method for analyzing communication.

One of the most useful advantages of the GT100 model is its ability to detect the OBDII protocol used by the vehicle and visually indicate the communication status. After connecting to the vehicle’s OBD2 port and the diagnostic tester, the corresponding LEDs for the active lines light up or flash, allowing quick identification of CAN, ISO9141, K-Line, or J1850 lines. In addition, the device displays the actual voltage from the OBDII interface, helping prevent diagnostic or programming errors caused by low voltage.

The GT100 is also ideal for connecting a single ECU on the bench or outside the vehicle using the included jumper wires. This makes it very useful for individual module diagnostics, ECU testing, and programming, including situations where separate power supply for the module is required. The guide notes that for ECUs using the CAN protocol, a 120 ohm resistor may be required, which is included in the package. Power can be supplied either directly from the vehicle’s OBDII port or through the included AC adapter.

Another important feature is the ability to extend and access the OBDII port. Essentially, the GT100 can extend the vehicle’s diagnostic interface and provide easier access in tight spaces. The guide states that the extension can reach up to 1.2 meters, which is useful for servicing, measurements, and oscilloscope or voltage testing at the OBD2 port.

The device also allows conversion of certain OBD1 interfaces to the OBD2 standard, depending on the communication protocol of the diagnostic interface. In addition, the GT100 can be used for simultaneous connections of multiple ECU modules, a feature that is particularly useful for mechanics and auto electricians performing advanced analysis and maintenance on vehicle electronic systems.

A practical feature for service work is maintaining vehicle power during battery replacement. Using the GT100, power can be temporarily supplied to the relevant OBD2 port lines during battery replacement to reduce the risk of data loss or malfunctions. The guide emphasizes connection to pins 16, 4, and 5 and notes that the ignition should not be turned on during this procedure.

Technically, the GODIAG GT100 uses an OBDII diagnostic port, operates at DC 9V–24V, has low power consumption of approximately 0.5–0.6W, and the included adapter has AC 100V–240V input and DC 12V 1A output. The device is designed for operation at temperatures from -20°C to 70°C and for storage between -40°C and 85°C.