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

Air Flow Meter/Sensor: Description and Operation






The Mass Air Flow sensor (MAF sensor) measures the mass of the air flowing into the engine. The powertrain control module uses the MAF sensor signal to calculate the fuel injector pulse width.