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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0133: Ho2S Circuit Slow Response - Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Using scan tool, check for additional DTCs. If DTC P0140 is set, go to step  4. If DTC P0140 is not set, go to next step.
  3. If any powertrain component DTCs are set, diagnose applicable DTCs. If no powertrain component DTCs are set, go to step  5.
  4. HO2S is contaminated. Repair cause of contamination and replace affected HO2S. After repairs, go to step  18.
  5. Using scan tool, store DTC information from PCM, and then clear DTCs. Reset fuel trim values. Start engine and allow it to reach normal operating temperature. Operate engine under conditions required to set this DTC. If scan tool indicates this DTC ran and failed this ignition, go to step  7. If scan tool indicates this DTC ran and passed this ignition, go to next step.
  6. Condition that set this DTC is not present at this time. Check for the following:
    • Exhaust leaks between engine and HO2S.
    • Poor HO2S connector terminal contact.
    • HO2S connector water intrusion.
    • Improperly torqued HO2S.
    • Faulty HO2S heater.
    • Poor PCM harness connections.
    • HO2S high or low circuit intermittently open, shorted, or excessive circuit resistance.
    • Contaminated HO2S.
    Repair as necessary. After repairs, go to step  18. If no problems are found, see DIAGNOSTIC AIDS .
  7. Check for exhaust leaks between engine and HO2S. Check for poor harness connections at HO2S and PCM. Repair as necessary. After repairs, go to step  18. If no problem is found, go to next step.
  8. Turn ignition off. Disconnect HO2S. Using a jumper wire, jumper HO2S low circuit (PCM side) to ground. Turn ignition on, with engine off. Using scan tool, monitor HO2S voltage. If voltage is 351-551 mV, go to next step. If voltage is not 351-551 mV, go to step  13.
  9. Using a jumper wire, jumper HO2S high signal circuit to ground. Using scan tool, monitor HO2S voltage. If voltage is less than 20 mV, go to next step. If voltage is not less than 20 mV, go to step  14.
  10. Remove jumper wire from HO2S low signal circuit. Using test light connected to ground, probe HO2S heater ignition feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step  15.
  11. Connect test light between HO2S heater ignition feed and ground circuits at HO2S harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  16.
  12. Check for any conditions that may contaminate HO2S. Repair as necessary. After repairs, go to step  17.
  13. Check HO2S high signal circuit for short to low signal circuit, ground or ignition voltage source. Repair as necessary. After repairs, go to step  18.
  14. Check HO2S high or low signal circuits for an open or high resistance. Repair as necessary. After repairs, go to step  18.
  15. Repair HO2S heater ignition feed circuit. After repairs, go to step  18.
  16. Repair HO2S heater ground circuit. After repairs, go to step  18.
  17. Replace HO2S. After repairs, go to next step.
  18. Using scan tool, clear DTCs. Turn ignition off and wait 15 seconds. Operate vehicle under conditions required to set DTC. If scan tool indicates this test ran and passed, go to next step. If scan tool does not indicate this test ran and passed, go to step  2.
  19. Using scan tool, review CAPTURED INFO. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, system is okay.
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