1994 Ford EGR Vacuum Regulator (EVR) Solenoid 9J459 Description - Page 10A-7

This is page 10A-7 from the Ford 1994 Powertrain Control/Emissions Diagnosis manual (dated July 1993), covering Exhaust Gas Recirculation (EGR) Systems in a section titled "EGR System Descriptions." The page describes the EGR Vacuum Regulator (EVR) Solenoid, Ford base part number 9J459. The text explains that the EVR solenoid is an electromagnetic device controlling vacuum output to the EGR valve: current in the coil induces a magnetic field in the armature, pulling on a disk that closes the vent to atmosphere. The Powertrain Control Module (PCM) outputs a duty cycle to the EVR to regulate vacuum level to the EGR valve — as duty cycle increases, so does the vacuum signal. The vacuum source is manifold vacuum. On some applications a current-control thermistor compensates for extreme temperature operation; the EVR solenoid and thermistor are serviced as an assembly. Figure 10 shows two illustrations of EVR solenoids, one labeled with a thermistor (identified as the 2.3L Ranger variant), with port callouts "TO EGR VALVE" and "TO SOURCE VACUUM," plus an EVR schematic symbol and drawing reference A9359-D. A reader learns how the PCM electronically modulates EGR vacuum and how to identify the EVR component and its hose connections.