EGR Valve Position Sensor: Description and Operation

EGR Lift Sensor (typical):

PURPOSE
The Exhaust Gas Recirculation (EGR) Lift Sensor detects the amount of EGR valve lift and sends this information to the Programmed Fuel Injection Electronic Control Module (PGM-FI ECM).

OPERATION
The PGM-FI ECM contains memories for optimum EGR lift during various conditions. It reads actual EGR position from the lift sensor. The sensor uses a plunger operated potentiometer supplying a signal to the PGM-FI ECM. If the EGR actual position differs from it's preferred position, the PGM-FI ECM cuts control solenoid power to reduce vacuum applied to the EGR valve.