LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Pontiac >> 2001 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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. When ignition is turned 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 with test. Preprogram scan tool with vehicle information before ignition is turned on. Ensure vehicle meets requirements listed in CONDITIONS FOR RUNNING . Turn all accessories off. Set parking brake and verify transmission is in Park for automatic transmissions and Neutral for manual transmissions. Start engine and allow to idle for 2 minutes or until I/M system status indicator updates to YES. If HO2S heater system status updates to YES, go to step  5. If HO2S heater 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 HO2S heater system status display updates to YES, go to next step. If HO2S heater 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.
scientia non olet · About LEMON Manuals