Circuit Description

PCM monitors EGR valve pintle position input to ensure that valve responds properly to commands from the PCM. When ignition is turned on, PCM learns the EGR closed valve pintle position. PCM compares the learned EGR closed valve pintle position to the actual position when EGR valve is commanded closed. If actual EGR position indicates that EGR valve is still open when PCM is commanding EGR closed, DTC will set.

Conditions for setting DTC are: there is no CKP, ECT, IAT, MAF, MAP, TP or VSS DTC set, no misfire, idle speed, fuel injector related DTCs set, system voltage 10-186 volts, EGR feedback is .2 volt greater than EGR closed valve pintle position when desired EGR position is commanded to zero percent and conditions present for longer than 20 seconds.