Circuit Description

PCM monitors EGR valve pintle position input to ensure that valve responds properly to commands from PCM. PCM compares actual EGR position with desired EGR position when valve is commanded open. If actual EGR position is 15 percent less than desired EGR position when PCM is commanding EGR valve opened, DTC will set.

DTC will set when no ECT, HO2S, IAT, MAF or TP sensor DTCs are set, TP sensor angle is greater than 2 percent, DTC diagnostic not running, or system voltage is greater than 10 volts.