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Home >> Oldsmobile >> 2001 >> Bravada >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Engine Controls Self-Diagnostics - 2.2L) >> Inspection/Maintenance Procedures >> Inspection/Maintenance Catalyst System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Sonoma and 2001 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic 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.
    • 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. If catalyst system status updates to YES, go to step  5. If catalyst system status does not update to YES, go to next step.
  3. Using scan tool, observe DTC Information. If DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, 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 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. If status updates to YES, go next step. If status does 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, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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