Exhaust Gas Recirculation (EGR) Actuator and Valve Position Sensor
The EGR actuator is a variable position valve that controls the amount of exhaust that enters the intake manifold. The EGR actuator is controlled by the PCM using a pulse width modulated (PWM) signal that varies from 0-100%. The EGR actuator consists of 2 components, a valve with an actuator, and a position sensor to monitor valve movement. The EGR valve position sensor is a potentiometer sensor which is needed to give the control circuit feedback to achieve the desired travel position. When the EGR receives a 5 volt reference signal and a ground from the PCM, a linear analog voltage signal from the sensor indicates the position of the EGR valve. Input signals from the manifold absolute pressure (MAP), exhaust pressure (EP), and barometric pressure (BARO) sensors are used by the PCM to calculate and control the EGR system flow.