Circuit Description

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. VCM uses this signal for fuel control.

MAF sensor readings during acceleration will be much higher than those during deceleration or idle. VCM calculates what MAF sensor reading should be from the sensor under certain conditions using engine speed (RPM) and barometric pressure parameters. When certain test conditions are met, PCM will compare its calculated MAF value to the actual value received from the sensor. If detected MAF sensor frequency is 10 Hertz (Hz) or less, DTC P0102 will set.

For duplication of DTC, ensure engine is running, engine speed is greater than 300 RPM, and system voltage is greater than 8 volts.