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Home >> Saturn >> 2003 >> Ion 1 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1134: Ho2S Transition Time Ratio - 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. Operate engine at 1500 RPM for 30 seconds. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage parameter varying above and below the specified range of 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 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 next step. If no, problem is intermittent, go 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 less than 100 mV? If yes, go to step  6. If no, go to next step.
  5. Is the HO2S 1 voltage parameter more than 800 mV? If yes, go to step  7. If no, go to step  9.
  6. Test the HO2S 1 high signal circuit for a short to ground. Did you find and correct the condition? If yes, go to step  17. If no, go to step  8.
    7. NOTE: The sensor may be damaged if the circuit is shorted to a voltage source.
  7. Test the HO2S 1 high signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  8. Test the HO2S 1 high signal circuit for a short to the HO2S low signal circuit or to the HO2S heater low control circuit. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  9. 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  12.
  10. 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  13. If no, go to next step.
  11. Test the HO2S 1 low signal circuit for an open. Did you find and correct the condition? If yes, go to step  17. If no, go to step  14.
  12. Test the HO2S 1 high signal circuit for an open. Did you find and correct the condition? If yes, go to step  17. If no, go to step  14.
  13. 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  17. If no, go to next step.
  14. Test for an intermittent and for a poor connection at the ECM. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
    15. CAUTION: Before replacing the HO2S 1, check and remove any source of contamination to prevent damage to new HO2S.
  15. Inspect for the following conditions:
    • The use of incorrect silicone RTV sealant.
    • Fuel contamination.
    • An exhaust leak.
    • The HO2S is installed correctly.
    • Damaged wiring.

    Did you find and correct the condition? If yes, go to step  17. If no, go to next step.

  16. 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.
  17. Using scan tool, clear DTCs. Turn ignition switch to OFF position for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC . Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  18. Using a scan tool, observe the CAPTURE INFO. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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