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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P1134 & P1154: Ho2S Bank 1 & 2 Sensor 1 - Transition Time Ratio >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Are any DTCs set other than DTC P0134? If yes, diagnose those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. With the engine at operating temperature, raise and hold the engine speed above 1200 RPM for 2 minutes. Observe the HO2S voltage display on the scan tool. Does the scan tool indicate HO2S voltage varying outside 400-500 mV? If yes, go to next step. If no, go to step  5.
  4. Review and record scan tool Failure Records data. Operate the vehicle within the Failure Records conditions. With the scan tool, observe the Specific DTC Information for this DTC until the test runs. Does the scan tool indicate this DTC passed? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  5. Disconnect the affected HO2S harness connector. Turn the ignition ON, with the engine OFF. Jumper the HO2S signal and low circuits in the harness connector (PCM side). Observe the HO2S voltage display on the scan tool. Does the scan tool indicate an HO2S voltage below 75 mV? If yes, go to step  6. If no, go to next step.
  6. Turn OFF the ignition. Disconnect the PCM connector C1. Test for the following conditions:
    • Open signal circuit.
    • Open low circuit.
    • Poor terminal connections at the PCM.

    If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  10. If no, go to step  9.

  7. Inspect for poor terminal connections at the HO2S harness connector. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  10. If no, go to next step.
  8. Replace the affected HO2S. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  10.
  9. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  10. Use the scan tool in order to clear the DTCs. 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.
  11. With a scan tool, observe the stored information, Capture Info. 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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