DTC P0102: Mass Air Flow Sensor Circuit - Low Frequency: Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Mass Air Flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The Engine Control Module (ECM) uses the MAF sensor signal in order to provide the correct fuel delivery for a reduction in emissions. The ECM uses MAF sensor signal to control fuel delivery until a calibrated amount of engine air flow is attained. The MAF sensor has an ignition 1 voltage circuit, a signal circuit and a low reference circuit. the MAF sensor produces an output voltage based on the inlet air flow through the air induction system. This output voltage will display on the scan tool as a grams per second (g/s) value. If the ECM detects that the actual MAF sensor voltage signal is less than the possible range of a normally operating sensor DTC P0102 sets.