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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P1134 & P1154: Ho2S Transition Time Ratio - Bank 1 & 2, Sensor 1 (Jimmy CANADIAN, SONOMA & S10 Pickup) >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: Allow the engine to cool for one-half hour before proceeding with this diagnostic. This allows the HO2S signal voltage to return to bias voltage, approximately 447 mV.
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. Command the HO2S heater ON with a scan tool. Immediately observe the affected HO2S voltage for 2 minutes. Does the HO2S voltage go from bias voltage to more than or less than 300-600 mV? If yes, go to next step. If no, go to step  5.
  3. Start the engine. Allow the engine to reach operating temperature. Raise and hold the engine speed at 1200 RPM for 2 minutes. Observe the HO2S voltage with a scan tool. Is the HO2S voltage varying outside 350-550 mV? If yes, go to next step. If no, go to step  5.
  4. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  5. Turn OFF the ignition. Disconnect the affected HO2S connector. Jumper the HO2S high signal circuit to the low reference circuit. Turn ON the ignition, with the engine OFF. Observe the HO2S voltage with a scan tool. Is the HO2S voltage less than 200 mV? If yes, go to step  8. If no, go to next step.
  6. Turn OFF the ignition. Disconnect the PCM connector containing the HO2S high signal circuit. Test the HO2S high signal circuit for an open. Did you find and correct the condition? If yes, go to step  19. If no, go to next step.
  7. Test for an open between terminal "A" of the affected sensor harness connector and the following PCM terminals:
    • C1-29
    • C1-26
    • C1-63

    Did you find and correct the condition? If yes, go to step  19. If no, go to step  14.

  8. Remove the jumper from the previous step. Disconnect the opposite bank HO2S connector. Probe the affected HO2S heater high control circuit with a test lamp that is connected to a good ground. Command the HO2S heater ON with a scan tool. Does the test lamp illuminate? If yes, go to next step. If no, go to step  10.
  9. Connect a test lamp between the affected HO2S heater high control circuit and the HO2S heater low reference circuit. Command the HO2S heater ON with a scan tool. Does the test lamp illuminate? If yes, go to step  11. If no, go to step  13.
  10. Disconnect the PCM connector containing the HO2S heater high control circuit. Test the HO2S heater high control circuit for an open or short to ground. Did you find and correct the condition? If yes, go to step  19. If no, go to step  14.
    11. NOTE: Perform the following test on HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1. A condition in either sensor will cause this DTC to set.
  11. Test the HO2S heater high control circuit, sensor side, for a short to the HO2S body. Did you find the condition? If yes, go to step  18. If no, go to next step.
    12. NOTE: Perform the following test on HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1. A condition in either sensor will cause this DTC to set.
  12. Measure the resistance between the HO2S heater high control circuit, sensor side, and the HO2S heater low reference circuit, sensor side. Does the resistance of either sensor measure above or below 2-50 ohms? If yes, go to step  18. If no, go to step  15.
  13. Disconnect the PCM connector containing the HO2S heater low reference circuit. Test the HO2S heater low reference circuit for an open. Did you find and correct the condition? If yes, go to step  19. If no, go to next step.
  14. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  19. If no, go to step  17.
    15. NOTE: Before replacing the suspected HO2S, check and remove any source of contamination.
  15. Inspect for the following conditions:
    • The use of incorrect silicone RTV sealant.
    • An engine coolant leak into the combustion chamber.
    • Excessive engine oil consumption.
    • Fuel contamination.
    • An exhaust system leak between the engine and the HO2S.

    Did you find and correct the condition? If yes, go to step  19. If no, go to next step.

  16. Inspect for poor connections at the harness connector of the affected HO2S. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  17. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to step  19.
  18. Replace the affected HO2S. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  19. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  20. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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