Air Sub-System

XR4Ti

The air sub-system consists of an air cleaner, an air cleaner valve assembly, vane meter, throttle air bypass valve and air tubes.
Air entering the engine is measured by the vane meter located between the air cleaner and throttle body assembly.
The output of the vane meter is applied directly to the ECA to assist in determining the correct air/fuel ratio. The vane meter consists of two separate sensors, a vane airflow (VAF) sensor and a vane air temperature (VAT) sensor.
The throttle air bypass valve regulates the amount of air which flows around the throttle plate to control engine idle speed.