If your Xhorse VVDI Key Tool Max pro fails to start communication with vehicle and asks to check if the OBD wiring is normal, follow guide below to do a device self test.

VVDI Key Tool Max Pro Self Test

In main menu select IMMO Programming

Select More Functions

Press Device Test

Select K-line Test

Short Connect PIN7 and PIN15 with the OBD connector.

If Key Tool Max Pro says the test failed, there is something wrong with the device. You may need to send it back for repair.

https://www.vvdishop.com/service/vvdi-key-tool-max-pro-self-test.html

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