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Home >> GMC >> 1990 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Diagnostic Circuit Check (Diesel)

Diagnostic Circuit Check (Diesel)

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NOTE: The 6.2L with light duty emissions is equipped with a self- diagnostic system. For information on the diagnostic circuit check and retrieving codes, see TESTS W/CODES - DIESEL article in this section.
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