Circuit Description

Mass Airflow (MAF) sensor measures amount of air entering engine during a given time. PCM uses MAF sensor information for fuel delivery calculations. MAF sensor readings during acceleration are much higher than those during deceleration or idle.

PCM calculates what MAF sensor reading should be received from sensor under certain conditions using engine speed (RPM), throttle position, and altitude parameters. When certain test conditions are met, PCM will compare its calculated MAF value to actual value received from sensor. If MAF sensor signal frequency is less than 1200 Hertz (Hz), DTC will set.

For duplication of DTC, ensure engine is running, system voltage is greater than 8 volts, and TP sensor angle is less than 50 percent.