Test Data and Sensor View
This page details the EGR system sensors and hardware.
Differential Pressure Feedback
Sensor view and data:
Below, troubleshooting details which may be of use for testing.
Electronic Vacuum Regulator (EVR)
The EVR regulates the vacuum to the EGR valve and is controlled by a pulse-width signal to open and close the EGR valve. As the duty cycle pulse width signal increases, the EVR increases the vacuum to the EGR which opens further and admits more gas into the inlet system.
Vacuum not directed to the EGR valve is vented to atmosphere. Even at zero duty cycle (no voltage) some vacuum will still pass the EVR, but this is not enough to overcome the spring pressure. It is not until the EVR is at 40% duty cycle that the vacuum is enough to overcome the EGR spring pressure.
EVR Duty Cycle is shown below:
To prevent unmetered air leaks the valve must be clamped firmly to the inlet manifold with the gasket properly aligned with the gas port, and the EGR pipe must be properly secured to the valve. The valve itself can be tested by using Vehicle Explorer to read the DPFE sensor while a vacuum is applied to the EGR valve. The DPFE should show a rise in volts corresponding to the opening of the valve. This is provided that the DATA page has not shown a DTC from the CCM showing a voltage out of range error for the DPFE.
Diagrams © Ford (Europe)
Copyright © 2002 www.fordscorpio.co.uk