v on (EGH) Systems 10A-7 EGR System Descriptions " later (EVR) Solenoid9J459 Iator (EVR) solenoid (Figure 10) is an electromagnetic device which controls vacuum 9. An electric current in the coil induces a magnetic field in the armature which pulls on a to atmosphere. The Powertrain Control Module (POM) outputs a duty cycle to the EVR vacuum level to the EGR valve. As the duty cycle is increased, so is the vacuum signal to the urn source is manifold vacuum. , a current control thermistor device is also used to compensate for extreme temperature solenoid and thermistor are serviced as an assembly. THEHMISTOR TO EGR VALVE To EVR 4- SOURCE VACUUM 1994 Powenraln Control/Emissions Dlagnosls July. 1993