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 spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Air Flow Meter/Sensor: Description and Operation

Measuring Core-Volume Air Flow Sensor:

When air is passed through the Measuring Core-Volume Air Flow (MC-VAF) sensor, the measuring core moves parallel to the direction of air flow through the sensor. Core movement changes resistance through a potentiometer, providing a signal to the Powertrain Control Module (PCM) that is calculated as air flow volume. The voltage signal is used to determine fuel injection quantities.