Several months ago, I bought a GM tech 2 on Obd2warehouse.fr. And then I heard from my friend that it had better to do a self-test before using it. I am just a green hand, so I turn to ask obd2warehouse.fr engineer for help.
Here list the whole process about GM tech 2 self-test.
1.Insert the GM card to the main unit
 - GM Tech 2 Self-test
4.Select F3: Self Test
 - GM Tech 2 Self-test
6.Select Self Test Function.
 - GM Tech 2 Self-test
8.The self test result shown below.
 - GM Tech 2 Self-test
OBD2 Code Scanneurs Automobile
2012.2 V Autocom CDP Logiciel et Activation Service
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