Y AVAILABLE TOOLS Z SYSTEM PCV DIAGNOSIS CHART WINDOW READING PROBABLE TROUBLE REMEDY GREEN Syswm S sf ry Vent valve partially plugged Blow by Check valve close to capacity of valve YELLOW Tester hose kinked or block Reposition or clean hose Cmnkcase not sealed properly Check tester plugs and other seal off points Tester selector kn0b set incorrectly Check setting I I ent v ve partially plugged Check vent valve Slight kink in CT 2 tester hose Reposition tester hose YELLOW GREEN Slight engine blow by Check vent valve Crankcase not sealed properly Check tester plugs and other seal off points Tester selector knob set incorrectl Check settin Vent valve partially or fully plugged Check vent valve RED YELLOW Engine blow by exceeds valve capacity Engine overhaul indicated Rubber vent hose collapsed or plugged Clean or replace hose ent valve p ugged Check vent ve Vent valve stuck at engine off position Check vent valve Rubber vent hose collapsed or plugged Replace hose Extreme engine blow by Engine requires major overhaul