Aerostar 2WD V6-245 4.0L (1990)
Air Flow Meter/Sensor: Description and Operation
The vane air flow meter measures air flowing into the engine and is mounted between the air cleaner and the throttle body assembly. The meter
contains a movable vane directly connected to a potentiometer. Air rushing through the vane air flow meter, changes the position of the vane and
potentiometer. The potentiometer relays vane position information to the EEC-IV module. The EEC-IV module, then translates vane position
information into the amount of air flowing into the engine.
An air temperature sensor is incorporated within the vane air flow meter. This sensor constantly monitors air temperature entering the engine and also
transmits the information to the EEC-IV module. The EEC-IV module receives, then computes the air flow and air temperature information and adjusts
the fuel flow to obtain the optimum air/fuel mixture required.
