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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Inspection/Maintenance Procedures >> Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
  2. Turn all accessories off. Start operate engine at idle. Accelerate at part throttle to 45-55 MPH and maintain speed for 6 minutes or until I/M SYSTEM STATUS updates to YES. Vehicles equipped with a 5 or 6-speed manual transmission may require operation in 4th or 5th gear respectively, in order for test to run. Using scan tool, observe I/M SYSTEM STATUS. If HO2S/O2S SYSTEM STATUS updates to YES, go to step  5. If HO2S/O2S SYSTEM STATUS does not update to YES, go to next step.
  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine whether DTCs P0133, P0140, P1133 and P1134 have run. For those DTCs that have not run, see CODE ENABLE CRITERIA under appropriate DTC under DIAGNOSTIC TESTS. Operate vehicle to meet code enable criteria until DTCs runs. Using scan tool, observe I/M SYSTEM STATUS display. If EVAP SYSTEM STATUS updates to YES, go to next step. If EVAP SYSTEM STATUS does not update to YES, see DIAGNOSTIC AIDS .
  5. Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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