The Godiag GT100+ is a universal OBD2 breakout box designed for automotive diagnostics, ECU programming, and key programming. It's mainly used by mechanics and car programmers to test and troubleshoot vehicle communication issues, diagnose OBD2 port problems, and assist in ECU programming or immobilizer tasks.

How the Godiag GT100+ Works:

1. OBD2 Signal Breakout – It allows users to monitor and test each pin of the OBD2 port, making it easy to detect wiring faults.

2. ECU Connection & Programming – It can be used as a bridge between an ECU and a diagnostic tool for programming or flashing.

3. Diagnostic Tool Enhancement – It improves the stability of connections between the car and scanners, preventing disconnection issues.

4. Voltage Display & Protection – It shows the real-time voltage of the car battery and protects the ECU from power surges.

5. Relay Testing & Activation – It allows you to test relays in the vehicle to check their working condition.

6. IMMO Programming Support – It can be used for immobilizer programming, helping in key learning processes.

Use Cases:

• ECU programming & flashing

• Checking OBD2 port functionality

• Relay testing

• IMMO (Immobilizer) key programming

• Short-circuit detection

• Power supply monitoring

  
  

  
  

  Key Features & Benefits:

  ✅ OBD2 Signal Testing & Detection – Converts the car's OBD2 interface into a 16-pin signal detection port, making it easy to check for communication faults.

  ✅ ECU Programming & Module Connection – Connects single or multiple vehicle modules for testing, programming, and flashing.

  ✅ Diagnostic Tool Compatibility – Works with any OBD2 diagnostic scanner to verify if the car's communication system is functioning correctly.

  ✅ Power Supply Function – Provides stable power to the vehicle during battery replacement, preventing data loss, ECU lockouts, remote key failures, or warning lights.

  ✅ Visual LED Indicators – Displays real-time connection status to confirm OBD2 communication between the car and the diagnostic tool.

  
  

  How to Use the GODIAG GT100+ – Step-by-Step Guide

  The GODIAG GT100+ is an advanced OBDII breakout box and ECU connector used for diagnostic testing, ECU programming, and communication detection. Below is a detailed guide on how to use it effectively.

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  🛠 Step 1: Connect the GT100+ to the Vehicle

  1. Locate the OBDII Port – Find the OBD2 port in your car (usually under the dashboard, near the driver’s seat).

  2. Plug in the GT100+ – Insert the GT100+ into the vehicle’s OBDII diagnostic port.

  3. Check Voltage Display – The device will display the car’s battery voltage on the screen.

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  🔍 Step 2: Detect OBDII Communication & Protocols

  1. Turn on the GT100+ Power Switch – This activates the device and prepares it for testing.

  2. Connect a Diagnostic Tool – Use an OBDII scanner or ECU programmer and plug it into the GT100+.

  3. Check LED Indicators:

     • If the vehicle’s ECU communicates properly, the corresponding LED protocol indicator (CAN, K-Line, PWM, etc.) will light up.

     • If CAN protocol is detected, the CAN-H and CAN-L LEDs will brighten, and when data is being transmitted, they will dim or flicker slightly.

     • If no LED lights up, the OBDII port or ECU might have an issue.

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  🔧 Step 3: Perform ECU Programming & Testing

  1. For ECU Programming or Module Connection:

     • Connect the ECU or a single car module directly to the GT100+ (without the car).

     • Use the breakout cables if needed to test individual ECU pins.

     • Monitor the voltage, communication status, and power supply stability.

  2. Relay Testing (GT100+ Feature)

     • Insert the relay into the GT100+ relay socket.

     • Activate the circuit manually and observe if the relay switches correctly.

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  ⚡ Step 4: Power Supply Function (During Battery Replacement)

  • If you need to replace the car battery without losing ECU data:

    1. Use an external power source (such as a 12V battery or power adapter).

    2. Connect it to the GT100+ power input and turn on the switch.

    3. This ensures that ECU memory is not erased, preventing immobilizer issues or lost key programming.

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  🎯 Key Benefits of Using GT100+

  ✅ Quickly detects faulty OBDII communication between the car and scanner.
  ✅ Helps in ECU programming and module testing.
  ✅ Ensures safe battery replacement without losing data.
  ✅ Relay testing function to check automotive relays.
  ✅ Real-time voltage display to prevent ECU damage.