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Home >> Pontiac >> 2001 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Evaporative Emission System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform Inspection/Maintenance (I/M) system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing Inspection/Maintenance (I/M) system check, go to next step.
  2. Using scan tool, select SPECIAL FUNCTIONS. Determine if vehicle is equipped with SERVICE BAY TEST for the EVAP System. If vehicle is equipped with EVAP service bay test, go to next step. If vehicle is not equipped with EVAP service bay test, go to step  5.
  3. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Ensure vehicle meets requirements listed in CONDITIONS FOR RUNNING . Turn all accessories off. Using scan tool, follow directions to perform EVAP service bay test. See SERVICE BAY TEST . If EVAP system passes service bay test, go to step  8. If EVAP system passes service bay test, go to next step.
  4. Check scan tool for reason why test did not pass. Example: failed DTC or aborted test. Repair as necessary. After repairs, go to SERVICE BAY TEST .
  5. Ensure vehicle meets requirements listed in CONDITIONS FOR RUNNING . Turn all accessories off. Start engine and allow to idle. Once engine is started, DO NOT turn engine off for remainder of procedure until test is complete. Road test vehicle. For this test to run, accelerate at part throttle to 45 MPH. Maintain this speed until engine reaches operating temperature. This may take up to 10 minutes, depending on the start-up coolant temperature. Continue operating vehicle an additional 3 minutes after engine reaches operating temperature or until I/M system status indicator updates to YES. If EVAP system status updates to YES, go to step  8. If EVAP system status does not update to YES, go to next step.
  6. Using scan tool, monitor DTCs. If any DTCs are set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, go to next step.
  7. Using scan tool, monitor NOT RAN SINCE CODE CLEARED display. Determine which DTCs required for YES status have not run. See INSPECTION/MAINTENANCE SYSTEM DIAGNOSTIC TROUBLE CODES  table under INSPECTION/MAINTENANCE (I/M) SYSTEM CHECK. Enter DTC number in SPECIFIC DTC menu of scan tool. Operate vehicle within conditions for running DTC located in FREEZE FRAME and/or FAILURE RECORDS for DTC. Repeat procedure until scan tool indicates diagnostic test has run. Repeat step for any additional required DTCs that have not run. Using scan tool, observe I/M system status display. If EVAP system status display updates to YES, go to next step. If EVAP system status display does not update to YES, go to DIAGNOSTIC AIDS .
  8. Using scan tool, observe emission related DTC portion of I/M system status display. If scan tool indicates any emission related DTCs are set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs are set, system is okay at this time.
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