Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

MAF Frequency

Range (Frequency in Hertz)
The MAF produces a frequency as it measures airflow entering the engine. The VCM detects this frequency on the signal circuit and converts it into a grams per second (g/s) of airflow scale. This raw frequency can be displayed by the scan tool as it is detected by the VCM.