LEMON Manuals: Even more car manuals for everyone
Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> Diagnostic Tests >> DTC P1134: Ho2S Transition Time Ratio (Bank 1; Sensor 1) >> 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: If any other DTCs are set, except HO2S DTCs, refer to other DTCs first before proceeding with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Operate engine at normal operating temperature. Operate engine at greater than 1200 RPM for 2 minutes. Observe the HO2S 1 voltage parameter with scan tool. Does scan tool indicate that the HO2S 1 voltage is varying greater than and less than 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 - 4.2L BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article.
  4. Turn ignition off. Disconnect the HO2S 1. Turn ignition on, with engine off. Measure the voltage of the HO2S 1 high signal circuit on the PCM side to a good ground with the DVOM. Does the voltage measure within 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 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 circuit. 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 the HO2S 1 heater low control circuit. Turn ignition on, with engine off. Command the HO2S 1 heater ON and OFF with the 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 the HO2S 1 high signal circuit for an 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 the HO2S 1 low signal circuit for an open, short to voltage, or high resistance. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  11. Test the ignition 1 voltage circuit for an open, short to ground, or high resistance. Replace O2 fuse, if necessary. Did you find and correct the condition? If yes, go to step  19. If no, go to step  15.
  12. Test the 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 the HO2S 1 heater low control circuit for an open, short to voltage, or high resistance. 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 of silicone RTV sealant, fuel contamination, exhaust leak, HO2S installed incorrectly, 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 harness connector of the PCM. 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. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  19. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. 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 scan tool. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
scientia non olet · About LEMON Manuals