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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 Complete System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
    2. 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 scan tool with vehicle information before ignition is turned on. Ensure vehicle meets conditions under conditions for running the DTC. See ENABLE CRITERIA . Turn off all accessories, such as A/C, blower fan, etc. Set vehicle parking brake. Ensure transmission is in Park (A/T) or Neutral (M/T). Start engine and allow to idle for 2 minutes, then go to next step.
    3. 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.
  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, then 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, then 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, A/T in Drive or M/T in Neutral with clutch pedal depressed, then go to next step.
  6. Using scan tool, observe I/M System Status display. If all I/M System Status indicators update to YES, go to next step. If not all I/M System Status indicators update to YES, repeat procedure.
  7. Using scan tool, observe emission related DTC portion of I/M System Status display. If scan tool indicates any emission related DTCs, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate emission related DTCs, system is okay.
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