Diagnostic Aids

Vacuum switch in the EGR solenoid is not used. If EGR valve sticks open, a rough idle will result. If EGR solenoid vent filter becomes plugged, EGR valve will remain open or close slowly. An inoperative check valve in the ported vacuum supply line will result in faulty EGR system operation.

Fig 1: Code 32 Schematic (4.3L) EGR System Error

Fig 2: Code 32 Flow Chart (4.3L) EGR System Error