How to use Godiag GT100 OBDII·ECU Connector

Godiag GT100 Break Out Box is a tool mainly used for changing automotive diagnostic OBD stitch to signal judgment level transfer, can connect with any diagnostic instruments and judge whether car communication is normal.

GODIAG GT100 Indicator Meaning:
– By connecting the vehicle and diagnostic tool via OBDII, Godiag GT100’s LED will indicate whether the OBDII diagnostic interface has a good communication with the car.

– Monitor the voltage of vehicle OBDII interface and display it in real time. If it is less than 11V, please stop the diagnosis and programming to avoid the vehicle being unable to start/data loss/module locked.

Godiag Gt100

1. Manufactory custom
2. SJE1850 wire
3. Manufactory custom
4. Power grounding
5. Signal grounding
6. SAEJ2284《CAN》high
7. ISO9141-2&iso, DIS4230-4K wire
8. Manufactory custom
9. Manufactory custom
10. SJE1850 wire《bus->
11. Manufactory custom
12. Manufactory custom
13. Manufactory custom
14. SAEJ2284《CAN》low
15. ISO9141-2 & ISO/DIS 4230-4L wire
16. Car battery positive

GODIAG GT100 Functions and operation guide 

1. OBDII Protocol Detector & communication detection 
Godiag Gt100 Obdii Protocol Detector User Manual 3

1). Connect GODIAG GT100 to the OBDII diagnostic port of the car.
2). When the device displays the voltage, turn on the power switch of GODIAG GT100.
3). Then connect to the diagnostic tool, when the tool is communicating with the car, the LED indicator of corresponding protocol will light up or flash. ( If the CAN protocol is detected, it will have the maximum brightness. When the communication is successful, the corresponding CAN-H and CAN-L will dim or twinkling weakly)

2. ECU connection: single module connection

GODIAG GT100, connected to a single ECU module, is convenient for a user to do the single-module diagnosis and programming.

Godiag Gt100 Obdii Protocol Detector User Manual 4
1). Connect the ECU with the color jumpers. (If the ECU is CAN protocol, please check whether you will need to connect a 120 ohm resistor.)
2). The Godiag GT100 can be powered by connecting to the OBDII diagnostic interface of car, or by an AC power adapter.
3). To diagnose and program for a single ECU by connecting the diagnostic tool or ECU programmer.

3. Banana plug extension connection:
Extend the car’s OBDII 16pin interface to tell you whether the OBDII interface connection is good or not, which is convenient for the test of OBDII interface voltage waveform.
Godiag Gt100 Obdii Protocol Detector User Manual 5
4. Convert OBD1 diagnostic interface to the standard OBD2

Use the connector to convert the OBD1 interface into obd2 interface according to the diagnostic interface communication protocol.

Godiag Gt100 Obdii Protocol Detector User Manual 6

5. Connect multiple ECU control modules at the same time, which is convenient for the professional engineers to detect and maintain.
Godiag Gt100 Obdii Protocol Detector User Manual 7
6. When to use the extension cables: The space of the diagnostic interface location is too narrow to connect to the diagnostic tool, or the user find that the diagnostic cable is not long enough during maintenance. It can be extended by 1.2 meters.
Godiag Gt100 Obdii Protocol Detector User Manual 8
7. Able to power the car when replacing the used battery.
1). Prepare battery A to supply power by connecting to No. 16 / 4 / 5 holes of Godiag GT100 & to the OBD2 diagnostic interface of the car.
[Notice 1. Turn on the power switch of Godiag GT100. 2. Don’t turn on the ignition switch, don’t start the car]

2). Then replace the brand-new battery B with the used battery in the car, which will ensure that the car has fully power to prevent data loss and audio lock-up or the malfunction due to lack of power to the ECU control module.
Godiag Gt100 Obdii Protocol Detector User Manual 9

8. The dedicated adapter will be released (help GT100 connect to the special ECU module) 
Godiag Gt100 Obdii Protocol Detector User Manual 10

Hardware Connection Diagram:
Godiag Gt100 Connection Diagram

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