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.

Conditions for setting DTC:

• No CKP, ECT, IAT, MAF, MAP, TP, VSS sensor, idle speed, fuel injector, misfire DTCs set.
• System voltage is 9-18 volts.
• Actual EGR position is 15 percent less than desired EGR position.
• Conditions present for longer than 20 seconds.