Air Vane Meter Assembly

The air vane meter assembly consists of 2 sensors contained in a single housing. It is mounted between the air cleaner and the throttle body assembly in front of left side shock tower (under air cleaner on right side of engine compartment on 2.3L turbo engine). The sensors are positioned such that both are exposed to intake airflow. These 2 sensors are the vane airflow (VAF) sensor and vane air temperature (VAT) sensor. The combined information from these sensors allows the ECA to determine the specific mass of air entering engine.

As air passes through the assembly, the air vane of the airflow sensor swings on a pivot. This vane is connected to a variable resistor (potentiometer) which is in turn connected to a constant 5 volt reference voltage. As air vane angle changes, so does voltage signal from potentiometer to the ECA. This voltage signal, therefore, represents specific rate of airflow. When this information is combined with incoming air temperature information, as supplied by air temperature sensor, the actual mass of air entering the engine can be determined.