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Home >> GMC >> 1990 >> Jimmy 5.7 K, Automatic, 700R4/MD8 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Diesel >> Self-Diagnostic System
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Self-Diagnostic System

The 6.2L light duty emissions system includes a self-diagnostic system which can determine input signal circuit malfunctions. Input signal circuits determine engine function control.