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Home >> Oldsmobile >> 2001 >> Bravada >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor (Ho2S/O2S) System Set Procedure >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
    2. CAUTION: 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 vehicle is within the conditions for running this procedure. See ENABLING CRITERIA . Turn all accessories off (e.g., A/C, blower fan, etc.). Start and operate engine at idle.
    • Accelerate vehicle at part throttle to 45-55 MPH and maintain speed for 6 minutes or until the I/M System Status updates to YES.
    • On vehicles with a either a 5-speed or 6-speed M/T may require operation in 4th or 5th gear respectively, in order for this test to run.

    Using scan tool, review I/M System Status display. If HO2S/O2S system status updates to YES, go to step  5. If HO2S/O2S system does not update to YES, go to next step.

  3. Using a scan tool, observe the DTC Information. If scan tool indicates any failed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
    4. NOTE: Refer to INSPECTION/MAINTENANCE SYSTEM DTC TABLE  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 number in the Specific DTC menu of scan tool. Operate vehicle within the conditions for running this procedure. See ENABLING CRITERIA . 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. If HO2S/O2S system status updates to YES, go to next step. If HO2S/O2S system status does not update to YES, see DIAGNOSTIC AIDS .
  5. Using scan tool, observe the emission related DTC portion of the I/M System Status display. If scan tool indicates any emission related DTCs set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs set, system is okay.
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