Circuit Description

This test determines if MAF sensor circuit failed by monitoring the MAF signal. MAF sensor is a high-frequency device that measures the rate of airflow through the throttle body. MAF sensor outputs a series of pulses that varies in frequency with airflow. PCM uses this signal for fuel control. Frequency signal will vary from about 2000 Hz at idle to 10,000 Hz at maximum engine load. DTC will set if signal from MAF sensor is below frequency range.