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Home >> Saturn >> 1999 >> SW1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0133 >> DTC P0133: Ho2S Circuit-Slow Response-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Check if any other HO2S DTCs are set. If any other HO2S DTCs are set, go to step  4. If no other HO2S DTCs are set, go to next step.
  3. If any powertrain component DTCs are set, diagnose applicable DTC. If no powertrain component DTCs are set, go to step  5.
  4. HO2S is contaminated. Repair condition causing contamination and replace affected HO2S. After repairs, go to step  18.
  5. Using scan tool, store VCM information, and then clear DTCs. Reset fuel trim values. Start engine and allow it to reach normal operating temperature. Operate vehicle under conditions required to set DTC. If scan tool indicates that DTC P0133 failed this ignition, go to step  7. If scan tool does not indicate that DTC P0133 failed 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 exhaust system for leaks between HO2S and engine. Check for poor harness connections at HO2S and VCM. 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 jumper wire, jumper HO2S low signal circuit to ground. Turn ignition on. 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 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 circuit. Using a 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 heater ground circuits at HO2S harness connector (engine harness side). 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 cause HO2S contamination. Repair as necessary. After repairs, go to step  17.
  13. Repair HO2S high signal circuit for short to low signal circuit or short to ignition voltage source. After repairs, go to step  18.
  14. Check HO2S high and low circuits for an open or high resistance. Repair as necessary. After repairs, go to step  18.
  15. Repair HO2S 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, reset fuel trim values. Start engine and allow it to reach normal operating temperature. Operate vehicle under conditions required to set DTC. If scan tool indicates this test ran and passed, system is okay. If scan tool does not indicate this test ran and passed, go to step  2.
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