DeVille Concours V8-4.6L VIN 9 (1994)
EGR Valve Assembly Sectional View
DESCRIPTION
The EGR valve regulates the amount of exhaust gas fed to the engine and is part of the Emission System. The PCM controls the EGR valve by
sending a Pulse Width Modulated (PWM) signal to the bobbin and coil subassembly contained within the EGR valve. The PCM monitors various
sensors to control the amount of EGR flow.
CIRCUIT OPERATION
The PCM commands the EGR valve to open a specific amount by varying the PWM signal to the linear EGR valve. The EGR contains a sensor
that relates the actual valve position back to the PCM. Similar to Throttle Position sensor reading, the EGR pintle position is expressed as being
0% at closed postion and 100% at the fully open position. In this way, the PCM is constantly comparing commanded EGR position versus actual
EGR position. This results in improved flow accuracy.
LOCATION
The EGR valve is located on the top LH side of engine.
