1. Verifies whether the diagnostic, programming, or coding tool is transmitting communication signals correctly.

2) Single Module ECU Connection

The GT100+ supports direct connection to a single ECU module, allowing technicians to perform focused, single-module diagnostics and programming with ease.

3) All-Keys-Lost Key Programming – Instrument & Immobilizer Activation

The GT100+ enables forced activation of the instrument cluster or immobilizer module for all-keys-lost key programming across multiple vehicle brands.

A. VW 4th & 5th Generation / Audi (All Keys Lost) For vehicles such as the Audi A6L, A4, A7, Q5, and Volkswagen Touareg, short-circuit the banana connector PIN 16 to PIN 1 to activate the dashboard. Once lit, connect a key programmer to the GT100+ female adapter for data collection. Note: Some models such as the A6L and Q7 may not display dashboard illumination, but data collection can still proceed successfully.

B. Toyota Engine ECU Replacement / All-Keys-Lost Programming When replacing the engine ECU on Toyota vehicles or performing all-keys-lost programming with select key programmers, short-circuit PIN 13 to PIN 4.

C. Mitsubishi All-Keys-Lost / All Remote Keys Lost For Mitsubishi key programming in all-keys-lost scenarios or OBDII setup when all remote keys are lost, short-circuit PIN 1 to PIN 4.

D. Porsche Cayenne All-Keys-Lost / All Remote Keys Lost For Porsche Cayenne key programming when all keys or all remote keys are lost, short-circuit PIN 3 to PIN 7.

4) Voltage and Current Display Function

When connected to an ECU module on the bench via the banana connector or DB25 dedicated ECU interface, the GT100+ displays real-time voltage and current readings, giving technicians an immediate view of the ECU's operating status.

This function simplifies fault diagnosis significantly. If no current is detected, or if the displayed value does not match the expected reading, the technician can first check for wiring errors. If the wiring is confirmed correct, the abnormal reading serves as a strong indicator that the ECU may be faulty — eliminating the need for further diagnostic communication and allowing the technician to proceed directly to ECU repair. Similarly, an unusually high current reading can point to either an incorrect cable connection or a damaged ECU.

5) Communication Protocol Display

The GT100+ supports real-time display of CAN BUS, K-Line, PWM, VPW+, and KWP 2000 communication protocols.

Pins 1, 3, 8, 9, 11, 12, and 13 — corresponding to the yellow banana connectors on the unit — are non-standard OBD2 protocol interfaces that may carry CAN BUS or K-Line communication signals, extending coverage beyond standard port limitations.

By comparison, the standard GT100 is limited to displaying K-Line, PWM, VPW+, and KWP 2000 protocols only, without CAN BUS support or non-standard pin communication display.

6) Bench ECU Communication

Enables fast and direct communication with a single ECU on the bench by connecting it to a compatible diagnostic or programming tool — allowing technicians and engineers to complete their work off-vehicle while eliminating the risk of unintended data loss or interference with other modules during in-vehicle testing.

7) Multiple ECU Module Connection

Designed to address the need for simultaneous multi-module connectivity during programming tasks — such as key programming procedures that require communication with several ECU modules at the same time — allowing engineers and technicians to manage complex workflows efficiently from a single connection point.

8) Auxiliary Power Supply – Uninterruptible Power Mode

Certain vehicles are prone to losing anti-theft or remote control data when the battery is disconnected. To prevent this, the GT100+ auxiliary power supply function maintains a continuous power feed to the vehicle throughout the battery replacement process, ensuring the ECU remains powered at all times and protecting against data loss, module lockout, or remote control failure during the swap.

9) Extended OBD2 Cable with Power Protection

The GT100+ features a 1.4-meter OBD2 cable, resolving common issues with short diagnostic tool cables or difficult-to-access vehicle diagnostic ports. Once connected, simply power on the GT100+ to view the vehicle's voltage reading on screen, providing an immediate check of the power supply status before proceeding with any diagnostics or programming. This also acts as a safeguard against potential damage to diagnostic and programming tools caused by modified or non-standard vehicle OBD2 ports.

10) OBD1 to OBD2 Port Conversion

For older vehicles equipped with OBD1 diagnostic ports or non-standard connector types, the GT100+ can convert the connection to a standard OBD2 interface using the banana plug and DB25 jumper cable, ensuring compatibility with modern diagnostic and programming tools.

11) Heavy-Duty Truck OBD1 to OBD2 Conversion

For special or heavy-duty trucks fitted with non-standard OBD1 diagnostic ports, the GT100+ converts the connection to a standard OBD2 interface based on the vehicle's communication protocol, ensuring seamless compatibility with modern diagnostic equipment.

12) BMW CAS4 / CAS4+ Programming Test

When used in conjunction with the BMW CAS4 / CAS4+ Programming Test Platform, the GT100+ allows technicians to verify whether a programmed key is functioning correctly with the CAS4 system before returning the vehicle to the customer.

13) BMW FEM / BDC Programming Test

Compatible with the BMW FEM / BDC Programming Test Platform, enabling technicians to validate programmed key functionality and module communication within the FEM and BDC systems prior to final vehicle handover.

Hardware Connection Diagram

GODIAG GT100+ Technical Specifications

GODIAG GT100+ Package Contents

• 1x Main Unit (Host)
• 1x OBD 2-in-1 Extension Cable
• 1x Colored Jumper Cable
• 1x 12V Power Supply
• 1x 120 Ohm Resistor
• 6x Banana Plugs
• 24x Wire Accessories — Dupont 2.54mm Female Connector Pins