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Home >> Pontiac >> 2001 >> Firebird Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Complete System Set Procedure >> Test Procedure
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Test Procedure

NOTE: If the vehicle has recently run, start this procedure at step  3. This will allow the tests that require the engine at operating temperature to run.
  1. If Inspection/Maintenance (I/M) system check has been performed, go to next step. If I/M system check has not been performed, go to INSPECTION/MAINTENANCE (I/M) SYSTEM CHECK .
    NOTE: Whenever ignition is on, ignition positive voltage is supplied to HO2S heaters. After verifying enable criteria, turn ignition off for approximately 5 minutes to allow sensors to cool before continuing test. Once engine is started, DO NOT turn engine off for remaining portion of procedure.
  2. Program scan tool with vehicle information before ignition is turned on. Turn off all accessories, including A/C and blower fan. Set vehicle parking brake. Ensure transmission is in Park (A/T) or Neutral (M/T). Start engine and allow to idle. Allow engine to idle for 2 minutes. Go to next step.
  3. Test drive vehicle and ensure vehicle is accelerated at part throttle to 55 MPH. Drive vehicle at this speed until engine reaches operating temperature. Continue test driving vehicle under these conditions for 6 minutes. 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 the throttle is closed, brakes are NOT applied, clutch is not actuated, transmission is not manually downshifted and vehicle speed remains above 25 MPH. After each deceleration period, return vehicle speed to 45 MPH under part throttle acceleration maintain for 15 seconds. Go to next step.
  5. Accelerate at part throttle to 45-55 MPH. Drive vehicle at this speed for 2 minutes. Decelerate to 0 MPH. After coming to a stop, ensure engine is idling with brake pedal depressed, automatic transmission in Drive and clutch pedal depressed (M/T) for 2 minutes. 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 all I/M system status indicators do not update to yes, go to appropriate I/M system set procedure for the indicated system in appropriate SYSTEM & COMPONENT TESTING article.
  7. Using scan tool, observe emission related DTC portion of the I/M system status display. If any DTCs are set, repair as necessary. Go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, system is okay and test is complete.
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