Monitored & Set Conditions

EGR system operation is monitored when engine temperature is more than 180°F (82°C), ambient temperature is more than 40°F (4°C), engine is in closed loop, oxygen sensor is operating, engine is under steady load with throttle open and oxygen sensor controller is not at or near its limits. If all conditions are met, EGR will be turned off and on momentarily. DTC will be stored in Powertrain Control Module (PCM) memory if all conditions are not met. Possible causes for DTC to set are: intermittent condition, restricted intake manifold or EGR backpressure transducer line, defective EGR solenoid, defective EGR valve, improperly installed EGR valve, inadequate vacuum supply to EGR valve, defective PCM, or defective connectors or wiring.