How does the LINK button on the Car Reader work?
Pressing and releasing the LINK button allows the Car Reader to link with your vehicle's computer to retrieve Diagnostic Trouble Codes (DTCs) from its memory or view I/M Readiness Monitor status. If you have multiple DTCs, use the SCROLL button to cycle through them (Page 9).
From the official Innova 3011 Carscan Code Reader Owner manual, page 9
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