General Motors Tech2 User Guide
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Read all screen instructions and connect or disconnect the appropriate cables and
loopback adapters. Screen messages will be displayed when external loopback connectors
are connected.
F0: Automated Main PCB and VCI Test
Selecting Automated Main PCB and VCI is a quick way to test the performance of the main
Printed Circuit Board (main PCB—the Tech2 main circuit board) and the Vehicle
Communications Interface (VCI). The Tech2 displays a test-in-progress screen while
performing all the PCB and VCI tests in sequential order.
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