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Home >> Oldsmobile >> 2002 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls Self-Diagnostics - 2.2L) >> Drive Cycles >> Inspection/Maintenance Catalyst System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Inspection/Maintenance (I/M) System Check? If yes, go to next step. If no, go to INSPECTION/MAINTENANCE SYSTEM CHECK  .
    WARNING: Road test vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
  2. Ensure the vehicle is within the Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC  . Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Start engine and allow the engine to idle.
    • Accelerate vehicle at part throttle to 55 MPH and maintain speed for 5 minutes.
    • Stop vehicle (zero MPH).
    • Operate engine at idle for 2 minutes with service brake depressed, transmission in Drive (A/T) or in Neutral with clutch pedal depressed (M/T).
    Using scan tool, observe I/M System Status display. Did the Catalyst System Status update to YES? If yes, go to step  5 . If no, go to next step.
  3. Using scan tool, observe DTC Information. Does the scan tool indicate any failed DTCs? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, go to next step.
    NOTE: Refer to INSPECTION/MAINTENANCE SYSTEM DTCS  to determine which DTCs are required to run in order to complete this test.
  4. Using scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Enter DTC in Specific DTC menu on scan tool. Operate vehicle within Conditions For Running this DTC. See CONDITIONS FOR RUNNING DTC  . Repeat procedure until scan tool indicates the diagnostic test has run. Repeat this step for any additional required DTCs that have not run. Using scan tool, observe I/M System Status display. Did the Catalyst System Status update to YES? If yes, go next step. If no, see DIAGNOSTIC AIDS  .
  5. Using scan tool, observe emission related DTC portion of I/M System Status display. Does scan tool indicate any emission related DTCs? If yes, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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