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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0130: Ho2S Circuit Closed Loop Performance - 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, clear DTCs and reset Fuel Trim values. Start and warm engine to normal operating temperature. Operate engine at idle. Using scan tool, monitor affected HO2S voltage. If voltage reading is fixed within 300-600 mV, go to step  4. If voltage reading is not fixed within 300-600 mV, go to next step.
  3. Check HO2S harness connector for water intrusion, intermittent open, high resistance or poor terminal contact at connectors. Check for faulty HO2S heater or faulty HO2S. Repair as necessary. After repairs, go to step  17. If no problems were found, see DIAGNOSTIC AIDS 
  4. Turn ignition off. Disconnect affected HO2S harness connector. Using a jumper wire connected to chassis ground, jumper HO2S low circuit. Turn ignition on, with engine off. Using scan tool, monitor affected HO2S voltage. If voltage reading is less than 200 mV, go to step  7. If voltage reading is not less than 200 mV, go to next step.
  5. Turn ignition off. Remove jumper wire. Disconnect PCM harness connector containing HO2S high and low circuits. Using a DVOM, check continuity of HO2S high signal circuit, then HO2S low circuit between PCM harness connector and HO2S harness connector. Resistance on both circuit should be less than 5 ohms. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step  9.
  6. Check PCM harness connector terminal contact. Repair as necessary. After repairs, go to step  17. If terminal contact is okay, go to step  16.
  7. Remove jumper wire from HO2S terminals. Connect a test light between HO2S heater ignition feed and heater ground circuit terminals. Turn ignition on, with engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  8. Turn ignition off. Reconnect HO2S harness connector. Disconnect PCM harness connector containing HO2S low circuit and PCM ground circuit. Using DVOM, check resistance between HO2S low circuit terminal and PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  12. If resistance is not less than 500 ohms, go to step  11.
  9. Repair circuit with high resistance. After repairs, go to step  17.
  10. Repair HO2S heater ignition feed or ground circuit. After repairs, go to step  17.
  11. Repair high resistance between HO2S low circuit and PCM ground circuit. After repairs, go to step  17.
  12. Check exhaust system for leaks upstream of affected HO2S. Repair as necessary. After repairs, go to step  17. If no leaks are present, go to next step.
  13. Cool engine to ambient temperature. Check resistance between HO2S low circuit terminal and PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  15. If resistance is not less than 500 ohms, go to next step.
  14. Remove HO2S. Clean sensor mounting threads and apply anti-seize compound to threads. Tighten HO2S to proper torque. Recheck resistance between HO2S low circuit terminal and PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  17. If resistance is not less than 500 ohms, go to next step.
  15. Replace HO2S. After replacing sensor, go to step  17.
  16. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  17. 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.
  18. 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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