Circuit Description

PCM monitors EGR valve pintle position input to ensure that valve responds properly to commands from PCM. The EGR (linear) valve is controlled by using an ignition positive driver and ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the ignition positive or ground circuit, then signal the PCM to set the DTC.

Conditions for setting this DTC:

• No CKP, ECT, IAT, MAF, MAP, TP, VSS sensors, misfire, idle speed or fuel injector related DTCs set.
• System voltage at 10-16 volts.
• EGR feedback is .4 volt greater than EGR closed valve pintle position when EGR is commanded to zero percent.
• Conditions present for longer than 20 seconds.