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Home >> Saturn >> 2003 >> L200 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Drive Cycles >> Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor 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 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 Test. See CONDITIONS FOR RUNNING TEST . Turn all of the accessories OFF, e.g., 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 45-55 MPH with this speed maintained for 6 minutes.
    • Decelerate to zero MPH, operate engine at idle for 2 minutes.

    While the following criteria is maintained:

    • Ensure service brake is depressed.
    • Transmission in Drive (A/T) or Neutral (M/T) with clutch pedal depressed.

    Using scan tool, review the I/M System Status display. Did the HO2S/O2S System Status update to YES? If yes, go to step  5. If no, go to next step.

  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
  4. Determine which DTCs are required to run in order to complete this test. See INSPECTION/MAINTENANCE SYSTEM DTCS . Using a 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 number in the Specific DTC menu of scan tool. Operate vehicle within the 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. Using scan tool, observe the I/M System Status display. Did the HO2S/O2S System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS.
  5. Using a scan tool, 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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