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Home >> GMC >> 1991 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems (Diesel) >> Exhaust Pressure Regulation (EPR) System

Exhaust Pressure Regulation (EPR) System

NOTE: For testing of the EPR system, refer to appropriate chart in the TESTS W/CODES - DIESEL article (for Diesel engines) or TESTS W/CODES - GASOLINE (for Gas engines) and article TESTS W/CODES - TRANSMISSION (if transmission codes are displayed) in this section.
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