Jeep Wagoneer/Commando/Cherokee 1984-1998

PCV Shutoff Solenoid



The positive crankcase ventilation shutoff solenoid is installed in the PCV valve hose and is energized by the MCU to turn off the crankcase ventilation system when the engine is at idle speed. An anti-diesel relay system on 4-cylinder engines, consisting of an anti-diesel relay and a delay relay, prevents engine run-on when the ignition is switched off by momentarily energizing the PCV valve solenoid when the ignition is switched OFF to prevent air entering below the throttle plate.