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 voltage or ground circuit, then signal the PCM to set the DTC.

DTC will also set when PCM detects and electrical malfunction in EGR valve control circuit for longer than 20 seconds, and system voltage between 9-18 volts.