1. Introduction
The GODIAG GT100 is a multi-function automotive tool designed for OBD II protocol detection, ECU connection, and various diagnostic and programming tasks. It supports powering ECUs on the bench, converting OBD1 interfaces to OBD2, and connecting multiple ECU control modules simultaneously. This manual provides detailed instructions for its setup, operation, maintenance, and troubleshooting.
Figure 1: GODIAG GT100 Automotive Tools OBD II Breakout Box ECU Connector.
2. Setup
Before using the GODIAG GT100, ensure all components are present and properly connected. The device can be powered via a 12V power adapter for bench work or directly from the vehicle's OBDII port.
2.1 Package Contents
- GODIAG GT100 Main Unit
- 12V Power Supply
- DB25 Colored Jumper Cable
- OBD 2-in-1 Extension Cable (1.2m)
- 24pcs XWire Accessories
- 6pcs Banana Plug Connectors
Figure 2: Included accessories with the GODIAG GT100.
2.2 Initial Connection
Connect the OBD 2-in-1 extension cable to the GT100 unit. For in-vehicle use, plug the OBDII connector into the vehicle's OBDII port. For bench operations, use the 12V power adapter to supply power to the GT100 unit.
Video 1: Overview of GODIAG GT100 functions and initial setup. This video demonstrates connecting the device and its various features.
3. Operating Instructions
The GODIAG GT100 offers multiple functionalities for automotive diagnostics and programming.
3.1 OBDII Protocol Detection
The GT100's input jack layout simulates the 16-pin layout of the OBDII interface, allowing for quick and intuitive signal detection. When an OBD2 scanner communicates with the vehicle, all 16 pins of the breakout box can be easily connected.
Figure 3: Key functions of the GODIAG GT100, highlighting OBDII protocol detection.
3.2 ECU Bench Programming and Key Programming
The GT100 allows you to power an ECU on the bench, facilitating diagnostics, vehicle immobilizer work, and key programming. This can be done using the included power adapter or by drawing power from the vehicle's OBDII port.
For lost car keys, the GT100 can short-circuit banana plug connectors to light up the dashboard. It can also connect with test platforms (e.g., CASA) to program keys.
Video 2: Demonstration of ECU bench programming and key programming capabilities using the GODIAG GT100.
Figure 4: Easy operation with banana plugs for connecting to ECU modules.
3.3 Multiple ECU Module Connection
The GODIAG GT100 supports connecting to multiple ECU control modules simultaneously using the color jumpers. If the ECU uses a CAN protocol, it may be necessary to connect a 120 ohm resistor.
Figure 5: Connecting multiple ECU control modules at the same time with color jumpers.
3.4 Sustaining Vehicle Power During Battery Replacement
The GT100+ OBDII Breakout Box can sustain power supply to the vehicle before replacing the battery. This prevents data loss, audio lock-up, or malfunctions due to lack of power to the ECU control module during battery changes.
Figure 6: Powering the car when replacing the used battery to prevent data loss.
3.5 OBD1 to OBD2 Interface Conversion
The device can convert the car's OBD2 interface into a 16-pin interface for signal detection and electrical level conversion. It can also convert an OBD1 interface to an OBD2 interface according to the diagnostic interface communication protocol.
Figure 7: DB25 Colored Jumper Cable used for OBD interface conversion.
4. Maintenance
To ensure the longevity and optimal performance of your GODIAG GT100, follow these maintenance guidelines:
- Keep the device clean and free from dust and debris.
- Avoid exposure to moisture and high voltage.
- Store the device in a dry environment when not in use.
- Handle cables and connectors with care to prevent damage.
Figure 8: Important warnings regarding moisture and high voltage from the product packaging.
5. Troubleshooting
This section addresses common issues and diagnostic steps for the GODIAG GT100, often involving communication problems with vehicle modules.
5.1 Diagnosing Transfer Case Control Module (TCCM) Issues
If you encounter issues with a Transfer Case Control Module (TCCM), such as a C0308 code (Motor A/B circuit low), follow these diagnostic steps:
- Verify Wiring Integrity: Check the wiring on the vehicle for continuity and correct voltage. Ensure all power and ground connections to the TCCM are good.
- Bench Testing with GT100: Use the GODIAG GT100 as a bench breakout box to communicate with the TCCM module outside the vehicle.
- Power and Ground Verification: Connect constant voltage, ignition voltage, and ground to the TCCM via the GT100. Observe if the module powers up correctly and if relays click as expected.
- Monitor Voltage Output: Check the voltage output on relevant pins (e.g., pin A and pin B for motor control). A faulty module might show constant 12V on a pin that should fluctuate or go to a 5V reference, indicating a stuck relay or internal issue.
- Scan for Codes: Connect a scan tool to the GT100 (which is connected to the TCCM) to read diagnostic trouble codes (DTCs). Codes like C0327 (Encoder circuit malfunction) or B2725 (Active Transfer Case (ATC) mode switch malfunction) may appear if the module is faulty or not receiving proper inputs.
If the module consistently shows incorrect voltage outputs or fails to respond as expected during bench testing, it indicates an internal fault within the TCCM itself.
Video 3: Detailed troubleshooting process for a Transfer Case Control Module (TCCM) using the GODIAG GT100 and a scan tool.
Video 4: Short demonstration of using the GODIAG GT100 for car diagnostics.
6. Specifications
- Brand: GODIAG
- Power Source: Corded Electric
- Operating System: Automotive Tools OBD II Break Out Box ECU Connector
- Display Resolution: 480 x 800 pixels
- Item Weight: 1.1 pounds
- Product Dimensions: 7.87 x 5.91 x 1.57 inches
- Item Model Number: GODIAG GT100
- UPC: 889327046294
7. Warranty & Support
For warranty information or technical support, please refer to the manufacturer's official website or contact their customer service. Keep your purchase receipt for any warranty claims.
