The purpose of this test is to satisfy the enable criteria necessary to execute an Inspection/Maintenance (I/M) system monitor for the Exhaust Gas Recirculation (EGR) system. The system monitor is comprised of the test results from one or more DTCs. This procedure may be used to set the EGR I/M System Status display on the scan tool to YES. The EGR I/M System Status display indicated whether or not the control module has completed the system monitor. The system monitor completes when either all DTCs comprising the monitor run and pass, or any DTC comprising the monitor illuminates the malfunction indicator lamp (MIL). If one of the DTCs comprising the monitor is set and the MIL is not illuminated, the necessary trips are required to illuminate the MIL before the monitor will complete. Once the monitor completes, the EGR I/M System Status display will be updated to YES.

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the system set procedure. If any DTCs do not run and no DTC is set, review the appropriate scan tool data list and service information. This will give an indication of why the DTCs do not run. Some may abort due to changes in the conditions while running. For example, changes in engine load, such as a cooling fan or A/C compressor clutch turning ON, may cause a DTC to abort. If the EGR I/M System Status does not update to YES, the procedure can be repeated until a YES status is achieved.