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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 Catalyst 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. Ensure vehicle meets requirements listed in CONDITIONS FOR RUNNING . Turn all accessories off. Start engine and allow to idle. Road test vehicle. Accelerate at part throttle to 55 MPH. Maintain this speed for 5 minutes. Decelerate to zero MPH. Idling engine for 2 minutes with brake pedal depressed, automatic transmission in Drive or manual transmission in Neutral with clutch pedal depressed. Using scan tool, observe the 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, monitor DTCs. If any DTCs are set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, go to next step.
  4. 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 Catalyst System Status display updates to YES, go to next step. If Catalyst System Status display does not update to YES, go to 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 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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