LEMON Manuals: Even more car manuals for everyone
Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0141: Ho2S Heater Performance - Sensor 2 >> 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.
    NOTE: Ensure HO2S is cool before proceeding with this diagnosis. Turn ignition off for at least 30 minutes before proceeding.
  2. Setup scan tool with proper vehicle ID before turning ignition on. Turn ignition on and quickly observe and record affected HO2S voltage. Monitor HO2S voltage for another 2 minutes. If HO2S voltage increases or decreases by 150 mV from initial reading, go to next step. If HO2S voltage does not increase or decrease by 150 mV from initial reading, go to step  4.
  3. DTC may have been set by an intermittent open or high resistance in HO2S high or low signal circuit, HO2S heater feed or ground circuit, poor HO2S or PCM connector terminals, of a faulty HO2S. Repair as necessary. After repairs, go to step  14. If no problems were found, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect affected HO2S harness connector. Connect a test light between HO2S heater ignition feed circuit and ground circuit terminal at HO2S harness connector. Turn ignition on, with engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  6.
  5. Remove test light. Connect a jumper wire between a known-good chassis ground and HO2S low circuit terminal at harness connector. Connect a jumper wire between a known-good ground and HO2S high signal circuit terminal at harness connector. Turn ignition on, with engine off. Using scan tool, monitor HO2S voltage to affected sensor. If reading is less than 20 mV, go to step  8. If reading is not less than 20 mV, go to step  7.
  6. Connect test light between a known-good ground and HO2S heater ignition feed circuit terminal at harness connector. Turn ignition on, with engine off. If test light illuminates, go to step  9. If test light does not illuminate, go to step  10.
  7. Turn ignition off. Remove jumper wires. Disconnect PCM harness connector containing the HO2S high and low signal circuits. Using a DVOM, check resistance between HO2S high and low signal circuits between PCM harness connector and HO2S harness connector. If resistance on both circuits less than 5 ohms, go to step  12. If resistance on both circuits is not less than 5 ohms, go to step  11.
  8. Replace HO2S. After repairs, go to step  14.
  9. Repair open in HO2S heater ground circuit. After repairs, go to step  14.
  10. Repair open in HO2S heater ignition feed circuit. Check for open fuse. If fuse is blown, repair cause of short in circuit. After repairs, go to step  14.
  11. Repair circuit with high resistance. After repairs, go to step  14.
  12. Check for proper PCM terminal contact. Repair as necessary. After repairs, go to step  14. If connection or terminal contact is okay, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
    NOTE: Ensure HO2S is cool before proceeding with this diagnosis. Turn ignition off for at least 30 minutes before proceeding.
  14. Setup scan tool with proper vehicle ID before turning ignition on. Turn ignition on and quickly observe and record affected HO2S voltage. Monitor HO2S voltage for another 2 minutes. If HO2S voltage increases or decreases by 150 mV from initial reading, go to next step. If HO2S voltage does not increase or decrease by 150 mV from initial reading, go to step  4.
  15. Using scan tool, clear DTCs. Review CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
scientia non olet · About LEMON Manuals