Drew Technologies DASHDAQ-XL - Manual (Page 29)

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Follow the on-screen instructions. The results will be posted on-screen at the end of the run. Example of a results screen:
DIAGNOSTIC CODE READER
To view and clear diagnostic trouble codes:
From the Main Menu tap on [Diagnostics]. This screen will appear:
Diagnostics screen for reading trouble codes
Note: Use the [<] and [>] buttons at the top to switch between Generic and Enhanced OEM information.
Turn the vehicle’s key to the on position. The vehicle does not need to be running.
Tap [Read Codes]. If the vehicle’s check engine light is on, diagnostic trouble code(s) (DTCs) will be displayed along with a short
description of each code.
Fix the diagnosed problem, or make note of it.
To clear the diagnostic trouble codes, tap [Clear Codes]. You will be asked to confirm that you want to clear the codes.
Confirmation to clear diagnostic trouble codes