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Home >> Saturn >> 2003 >> Ion 1 Automatic >> 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 diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Start engine. Allow the engine to reach operating temperature. Increase the engine speed to 2000 RPM. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage parameter varying above and below 300-600 mV? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L ION article.
  4. Turn OFF the ignition. Disconnect the HO2S 1. Turn ignition on, with engine off. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage parameter greater than 100 mV? If yes, go to next step. If no, go to step  11.
  5. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 1 harness connector on the engine harness side and a good ground. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage parameter less than 100 mV? If yes, go to next step. If no, go to step  7.
  6. Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 1 harness connector on the engine harness side and the low signal circuit of the HO2S 1 harness connector on the engine harness side. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage parameter less than 100 mV? If yes, go to step  9. If no, go to step  8.
  7. Test the HO2S 1 high signal circuit for an open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the HO2S 1 low signal circuit for an open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  9. Test for an intermittent and for a poor connection at the HO2S 1. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Test for an intermittent and for a poor connection at the ECM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the short between the HO2S 1 high signal circuit and HO2S 1 heater low control circuit. After repairs, go to step  14.
  12. Replace HO2S 1. See HEATED OXYGEN SENSOR under SENSORS & SWITCHES in REMOVAL & INSTALLATION - ION article. After replacement, go to step  14.
    13. NOTE: The ECM may be damaged if the HO2S low signal circuit was shorted to a voltage source.
  13. Replace ECM. See ENGINE CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - ION article. Perform ECM relearn procedure. See ENGINE CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing ECM, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition switch to OFF position for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  15. Using scan tool, observe CAPTURE INFO. Does scan tool display any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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