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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1071 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P2142 To P2279)) >> Diagnosis >> DTC P2279 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The mass airflow (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 condition while a small quantity of air indicates a deceleration or idle condition. The ECM has the ability to detect an air intake leak by using the MAF sensor and the EGR control pressure sensor.

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