What is GODIAG GT108 OBDI-OBDII Universal Conversion Adapter?

Godiag GT108 is a new professional OBDI to OBDII universal conversion adapter. It is able to convert the OBDI diagnostic interface into a standard OBDII diagnostic interface through a DIY wiring interface and connect to OBDII diagnostic programming equipment to read data streams, diagnose fault codes, program, activate, and code… for cars, SUVs, trucks, tractors, mining vehicles, generators, boats, motorcycles, and individual ECU control units, etc. It’s very convenient for the car maintenance personnel to use.

Godiag GT108 Converter Outlook:

  1. OBD2 female interface
  2. Indicator light group
  3. GND4. GND5 switch
  4. IGN switch
  5. DC power interface
  6. 1.2.3.GND4.GND5.6CAN-H.7K-Line. 15. BAT+.O-IGN interface

Godiag GT108 Conversion Adapter Features:

1. DIY wiring, can be converted to OBDII according to the car diagnostic interface.

Because the definitions of diagnostic interfaces in different regions are inconsistent, the popular conversion cables and adapters in the market cannot use different definitions of diagnostic interfaces. GODIAG GT108 Super OBDI-OBDII Adapter can be used by maintenance engineers to connect according to their own needs.

2. The device has reverse connection protection.

If the power supply is connected wrong, the device will not burn out, and it will not cause harm to the OBDII diagnostic programming device.

3. Independent GND4, GND5

It is more suitable for judging the problem of poor grounding of some control units.

4. Analog IGN switch.

Press the IGN switch, and the corresponding port outputs ING VCC

5.Power indicator, GND4, GND5 switching indicator, IGN switching indicator.

6. DIY the way to lock the wire.

Equipped with different diagnostic interface cables, ECU cables, and locking screwdrivers.

7. Truck & Car Diagnostic Interface Connection Jumper Kit

Different configurations of wiring kits are different, please purchase according to maintenance needs.

Comparison between Godiag GT108 OBDI-OBDII Converter and other brands’ adapters:

Item GODIAG GT108 OEM Universal Jumper Launch X431 PAD V/VII Heavy Duty Truck Adapter
Reverse connection protection × ×
Independent GND4, GND5 × ×
Analog IGN switch × ×
DIY for more vehicles √ Connectors are less Specific vehicles + DIY connectors are less
Connect diagnostic interface and also support analytical test
DC input, take power from battery × ×

Godiag GT108 OBDI-OBDII Conversion Adapter has A, B, and C three configurations.

  • A Configuration is for Cars, SUVs, Pickup Trucks, and Motorcycles
  • B Configuration is for Trucks, Tractors, Mining Vehicles, Generators, and Boats
  • C Configuration includes both A and B Configuration.

How to use Godiag GT108 Conversion Adapter?

1. Find the definition of the diagnostic interface

Find the maintenance manual of your own vehicle, or search online.), or see the definition diagram of the corresponding diagnostic interface of the GT108 manual.

2. According to the interface definition, find out the connection line needed by your car, and connect to the GT108 adapter according to the definition. (Use a screwdriver to lock the terminal.)

3. Connect the connected diagnostic cable to the vehicle OBD1 diagnostic interface according to the definition.

Connect GND 4 or GND5 first, and then connect BAT+.

If the power cable is connected correctly, the POW light of the GT108 host will light up.

If the vehicle diagnostic interface does not have power, please connect the car battery to the DC power connector of GT108 with the battery cable.

If the vehicle needs the ignition signal, connect the O-IGN line, and press the IGN switch, the corresponding IGN light will light up, and the O-IGN line will output the ignition power signal.

4. Connect the communication line CAN or K-line to the diagnostic interface.

Note: If it is the truck diagnostic software added by the car diagnostic equipment, you need to buy a GT106 24V to 12V adapter.

5. Connect the diagnostic device to start diagnosing the vehicle.


If you cannot find the definition for your own vehicle diagnostic interface, you can first find out the power supply of the diagnostic interface. First use the black battery clip on the battery connection cable to connect the negative pole of the battery, and then use the BAT+ line to connect to the diagnostic interface to find the power supply. You can also use a multimeter to find the diagnostic interface power supply. The definition of the diagnostic interface can also be judged by the GT101 PIRT Electric Circuit Tester.

Car Diagnostic Interface Definition:

AUDI VW Skoda Seat 1989-1997

AUDI VW Skoda Seat 1996-2008

BMW Motorcycle OLD S1000RR

BMW Motorcycle S1000R 2015

Ford 5or3 PIN 1989-1996

Ford Mazda 6PIN 1980-1995

Mercedes- Benz 38 PIN

For more definition diagrams, check the Godiag GT108 Manual.

Godiag GT108 Connection Diagram:

Car Connection (with Autel scanner):

Truck Connection (with Delphi DS150):

Truck Connection (with Launch X431 Tool and Godiag GT106):

Motorcycle Connection (with OBDSTAR Motorcycle diagnostic tool):

Mine Vehicles, Tractors, Boats, and Generators Connection (with Delphi DS150)

ECU Connection:

Godiag GT108 Super OBDI-OBDII Universal Conversion Adapter full version: