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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P1191: Intake Air Duct Air Leak >> Description

DTC P1191: Intake Air Duct Air Leak: Description

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The Mass Air Flow (MAF) sensor measures the amount of air entering the engine during a given time. The Engine Control Module (ECM) uses the MAF sensor information to monitor Exhaust Gas Recirculation (EGR) flow rate. A large quantity of air entering the engine indicates an acceleration or high load situation, while a small quantity of air indicates deceleration or idle. The ECM has the ability to determine an intake leak by using the MAF sensor and the EGR control pressure sensor.

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