850 T-5R L5-2.3L Turbo VIN 58 B5234T5 (1995)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
EGR Controller
EGR Vacuum Controller
The EGR valve is operated by the ECM by means of the EGR vacuum controller, one terminal of which is supplied at 12 Volts from the main
relay, while the second terminal is connected to the module. The ECM operates the controller by grounding the lead. The signal from the ECM is a
function of the engine speed, load and temperature, among other parameters.
Combined with the ambient pressure and intake manifold vacuum, the ECM signal is converted into a control pressure by the EGR vacuum
controller. This is used to operate the EGR valve through the vacuum hose.
The control signal to the EGR valve is supplied through the connection in the upper section of the controller, while the intake manifold vacuum is
supplied to the lower section. The controller stabilizes the intake manifold vacuum and converts the electrical signal from the ECM into a
modulated vacuum signal, which is used to operate the EGR valve.
The EGR vacuum controller is mounted on the underside of the relay shelf, above the engine cooling fan.
