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Home >> Chevrolet >> 2002 >> Cavalier Base, 4D Sedan, 2.2 4, LN2/KL6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 2.2L CNG >> Inspection/Maintenance Procedures >> Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure >> Diagnostic Procedure

Diagnostic Procedure

  1. If inspection/maintenance system check has been performed, go to next step. If inspection/maintenance system check has not been performed, go to INSPECTION/MAINTENANCE SYSTEM CHECK  . After performing inspection/maintenance system check, go to next step.
  2. Ensure vehicle is within CONDITIONS FOR RUNNING  . Turn off all accessories. Start engine and allow to idle. Road test vehicle. For this test to run, accelerate at part throttle to 45-55 MPH. Maintain this speed for 6 minutes or until I/M System Status updates to YES. Vehicles equipped with M/T (5 or 6 speed) may require operation in 4th or 5th gear respectively, for this test to run. Using scan tool, review I/M System Status display. Did the HO2S/O2S System Status update to YES? If yes, go to step  5 . If no, go to next step.
  3. Using scan tool, monitor DTC Information for both AF ECM and PCM. If scan tool indicates any failed DTC, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, monitor NOT RAN SINCE CODE CLEARED display. Determine which HO2S/O2S DTCs required for a YES status, have not run. Enter DTC number in SPECIFIC DTC menu of scan tool. Operate vehicle within CONDITIONS FOR RUNNING  . Repeat until scan tool indicates diagnostic test has run. Repeat for any additional required DTCs that have not run. Using scan tool, observe I/M System Status display. If HO2S/O2S System Status updates to YES, go to next step. If HO2S/O2S System Status does not update to YES, go to DIAGNOSTIC AIDS  .
  5. Using scan tool, monitor Emission Related DTC portion of I/M System Status display. Does scan tool indicate any emission related DTCs? If yes, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. If no, system is okay.
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