4000CS Quattro L5-2144cc 2.14L SOHC (JT) (1986)
Air Flow Meter/Sensor: Description and Operation
Air Flow Sensor Potentiometer
Fig. 12 Air Flow Sensor Potentiometer Schematic
Fig. 13 AirFlow Sensor plate Angle/Voltage Graph
The air flow sensor plate assembly uses a potentiometer to measure the position of the sensor plate. The potentiometer is mounted on the side of
the air flow sensor housing, under the fuel distributor.
The potentiometer consists of a wiper brush rubbing on a carbon film, Fig. 12. It sends a variable voltage signal to the control unit based on
sensor plate position, Fig. 13. The signal is used by the injection control unit for cold acceleration enrichment, and by the ignition control unit to
determine engine load (taking the place of the vacuum line used on earlier CIS-E systems).