LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Oldsmobile >> 2002 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls Self-Diagnostics - 2.2L) >> Drive Cycles >> Inspection/Maintenance Complete System Set Procedure >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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  .
    NOTE: Whenever ignition is on, ignition voltage is supplied to HO2S heaters. After verifying enable criteria, turn ignition off for about 5 minutes to allow sensors to cool before continuing with test. Once engine is started, DO NOT turn engine off for remaining portion of procedure.
  2. Preprogram the scan tool with the vehicle information before the ignition is turned ON. Ensure the vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING DTC  . Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Set the vehicle parking brake. Verify the transmission is in Park (A/T) and Neutral (M/T). Start and allow engine to idle for 2 minutes. When complete, go to next step.
    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.
  3. Accelerate vehicle at part throttle to 55 MPH and maintain with this speed until engine reaches operating temperature. This may be up to 8-10 minutes depending on start-up coolant temperature. Continue operation under these conditions for an additional 6 minutes. When complete, go to next step.
  4. Reduce vehicle speed to 45 MPH, maintain this speed for one additional minute. Perform 4 decelerations of 25 seconds each from 45 MPH while maintaining the following criteria:
    • Throttle closed.
    • No brake application.
    • No clutch actuation on M/T.
    • No manual downshift.
    • Vehicle speed remains greater than 25 MPH.

    After each deceleration period, vehicle is returned to 45 MPH under part throttle acceleration and speed is maintained for 15 seconds. When complete, go to next step.

  5. Accelerate vehicle at part throttle to 45-55 MPH and maintain speed for 2 minutes. Decelerate to zero MPH. Operate engine at idle for 2 minutes while service brake is depressed, Drive (A/T) or Neutral (M/T) with clutch pedal depressed. When complete, go to next step.
  6. Using scan tool, observe I/M System Status display. Did all of the I/M System Status indicators update to YES? If yes, go to next step. If no, repeat this set procedure.
  7. Using scan tool, observe emission related DTC portion of 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.
scientia non olet · About LEMON Manuals