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Home >> Oldsmobile >> 2001 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Inspection/Maintenance Procedures >> Inspection/Maintenance Exhaust Gas RECIRCULATION System Set Procedure >> Diagnostic Procedure
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Diagnostic Procedure

  1. If I/M system check has been performed, go to next step. If I/M system check has not been performed, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
  2. Ensure vehicle is operating with conditions for running this procedure. See ENABLE CRITERIA . Turn off all accessories, including A/C and blower fan. Start engine and allow it to idle. Accelerate at part throttle to 45 MPH and maintain speed for one minute. Perform 4 decelerations of 25 seconds each from 45 MPH while maintaining the following criteria:
    • Throttle is closed.
    • No brake application.
    • No manual downshift.
    • Vehicle speed remains greater than 25 MPH.

    After each deceleration period, vehicle speed is returned to 45 MPH under part throttle acceleration and speed is maintained for 15 seconds. Using scan tool, observe I/M system status display. If EGR system status updates to YES, go to step  5. If EGR system status did not update to YES, go to next step.

  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine if DTCs P0401, P0404, P0405 and P1404 have run. For those DTCs that have not run, operate vehicle under conditions to meet code enable criteria until DTC(s) runs. See CODE ENABLE CRITERIA under appropriate DTC under DIAGNOSTIC TESTS. Using scan tool, observe I/M system status display. If EGR system status updated to YES, go to next step. If EGR system status did not update to YES, see DIAGNOSTIC AIDS .
  5. Using scan tool, observe emission related DTC portion of I/M system status display. If scan tool indicates any emission related DTCs, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs, system is okay.
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