Air Flow Meter/Sensor: Description and Operation

Volume Air Flow Sensor Operation:

PURPOSE
The Volume air flow sensor is a Karman vortex type unit that sends information to the ECM regarding the mass/volume of air flow into the engine. The volume air flow sensor is incorporated within the air cleaner, it functions to convert the amount of engine air intake to pulse signals of a frequency proportional to the amount of engine air intake, and to input those signals to the engine control module. The engine control module then, based upon those signals, calculates the amount of fuel injection, etc..

OPERATION
The power for the volume air flow sensor is supplied from the Multiport Fuel Injection relay to the volume air flow sensor, and is grounded at the engine control module. The volume air flow sensor, by intermitting the flow of the 5 Volt reference voltage applied from the engine control module, produces pulse signals.