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EGR Valve Lift Sensor
- EGR lift sensor is part of EGR valve, located on top of engine. Turn ignition on. Measure voltage between terminals of Yellow/White wire (positive) and Green/White wire (negative) by backprobing EGR valve lift sensor connector. If voltage is not about 5 volts, repair open in Yellow/White or Green/White wire between ECM and EGR valve.
- Measure voltage between Yellow wire (positive) and Green/White wire (negative) by backprobing EGR valve lift sensor 3-wire connector. If voltage is about 1.2 volts, slowly apply 8 in. Hg to EGR valve. Completely release and reapply vacuum several times. Voltmeter should indicate about 4 volts with vacuum applied. If voltage is not as specified, replace EGR valve.