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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P1134: Ho2S Transition Time Ratio (Bank 1; Sensor 1) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  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. NOTE: If any other DTCs are set except for HO2S DTCs, diagnose the other DTCs first before proceeding with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Operate the engine at normal operating temperature. Operate the engine at greater than 1200 RPM for 2 minutes. Observe the HO2S 1 voltage parameter with a scan tool. Does the scan tool indicate that the HO2S 1 voltage is varying above and below the specified values of 350-550 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 off 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. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article.
  4. Turn ignition off. Disconnect the HO2S 1. Turn ignition on, with engine off. Measure the voltage from the high signal circuit of the HO2S 1 on the vehicle harness side to a good ground with a DVOM. Does the voltage measure 350-550 mV? If yes, go to next step. If no, go to step  9.
  5. Turn ignition off. Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and the HO2S 1 low signal circuit. Turn ignition on. Monitor the HO2S 1 voltage for the sensor that applies to this DTC with the scan tool. Does the scan tool indicate that the HO2S 1 voltage is less than 20 mV? If yes, go to next step. If no, go to step  10.
  6. Turn ignition off. Remove the 3-amp fused jumper wire. Connect a test light between the ignition 1 voltage circuit and a good ground. DO NOT use the HO2S 1 heater low control. Turn ignition on, with engine off. Does the test light illuminate? If yes, go to next step. If no, go to step  11.
  7. Connect a test light between the ignition 1 voltage circuit and HO2S 1 heater low control circuit. Turn ignition on, with engine off. Command the HO2S 1 heater ON and OFF with a scan tool. Does the test light turn ON and OFF with each command? If yes, go to step  14. If no, go to next step.
  8. Does the test light remain illuminated with each command? If yes, go to step  12. If no, go to step  13.
  9. Test HO2S 1 high signal circuit for open, high resistance, short to ground or short to voltage. Did you find and correct the condition. If yes, go to step  19. If no, go to step  16.
  10. Test HO2S 1 low signal circuit for an open, a high resistance, or short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  11. Test ignition 1 voltage circuit for an open, a high resistance, or a short to ground. Replace the EMISS fuse, if necessary. Did you find and correct the condition? If yes, go to step  19. If no, go to step  15.
  12. Test HO2S 1 heater low control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  13. Test HO2S 1 heater low control circuit for an open, a high resistance, or a short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
    14. NOTE: Before replacing the HO2S 1, inspect and remove any source of contamination.
  14. Inspect for incorrect use silicone RTV sealant, fuel contamination, exhaust leak, improperly installed HO2S, or damaged wiring. Did you find and correct the condition? If yes, go to step  19. If no, go to next step.
  15. Inspect for poor connections at the harness connector of the HO2S 1. Did you find and correct the condition? If yes, go to step  19. If no, go to step  17.
  16. Inspect for poor connections at the ECM harness connector. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  17. Replace HO2S 1. After replacing sensor, go to step  19.
  18. Turn ignition off. Replace ECM. Perform ECM relearn procedure. See ELECTRONIC CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing ECM, go to next step.
  19. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the conditions 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.
  20. 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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