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Home >> Saturn >> 2003 >> LW200 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Drive Cycles >> Inspection/Maintenance Catalyst System Set Procedure >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
    2. WARNING: Road test a 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 that the vehicle is within the Conditions for Running Test. See CONDITIONS FOR RUNNING TEST . Turn all of the accessories OFF, such as the A/C, blower fan, etc. Start engine and allow to idle. In order for this test to run, the vehicle must operate in the following conditions:
    • Accelerate at part throttle to 56 MPH and maintain speed for 5 minutes.
    • Decelerate to a stop. Allow engine to idle for 2 minutes with service brake applied, transmission in Drive (A/T) or Neutral (M/T) with clutch depressed.
    • Using scan tool, monitor I/M SYSTEM STATUS. 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 scan tool indicate any failed DTCs? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. Refer to Inspection/Maintenance (I/M) System DTCs to determine which DTCs are required to run to complete this test. See INSPECTION/MAINTENANCE SYSTEM DTCS . Use scan tool to observe the NOT RAN SINCE CODE CLEARED display. Determine which of DTCs required for a YES status has not run. Enter DTC number in the Specific DTC menu of scan tool. Operate vehicle within Conditions for Running Test. See CONDITIONS FOR RUNNING TEST . Repeat the procedure until scan tool indicates the diagnostic test has run. Repeat this step for any additional required DTCs that have not run. Use a scan tool to observe the I/M System Status display. Did the CATALYST SYSTEM STATUS update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Use a scan tool to observe the Emission Related DTC portion of the I/M System Status display. Does the scan tool indicate any emission related DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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