How do I retrieve diagnostic trouble codes (DTCs) using the Innova 3100?
To retrieve DTCs, follow these steps: turn off the ignition, connect the Code Reader to the vehicle’s DLC, turn on the ignition without starting the engine, and let the device link automatically. The LCD display will show any stored codes after a few seconds.
From the official Innova 3100 OBD2 Code Reader manual, page 17
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