When retrieving diagnostic trouble codes using the dashboard display, the technician must:

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ARun the engine at idle speed.
BDisconnect the battery first.
CReset the trip odometer.
DTurn the ignition to the ON position.

✓ Correct answer: D. Turn the ignition to the ON position. The ignition must be in the ON position (but engine not necessarily running) to power the electronic systems needed to retrieve diagnostic codes through the dashboard display.

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When retrieving diagnostic trouble codes using the dashboard display, the technician must:

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