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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 213 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0130, P0136, P0150 Or P0156: Ho2S Circuit No. 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. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS .
  2. Allow the engine to idle at operating temperature. Observe the affected HO2S voltage parameter with a scan tool. Clear the DTCs and record the Freeze/Frame Failure Records. Operate engine at 2000 RPM for at least one minute, then allow the engine to return to idle. Vary the engine speed from idle to 3000 RPM several times within 5 seconds. Did the affected HO2S voltage react immediately to the above action? 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. Start engine. Operate 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. Refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article.
  4. Turn ignition off. Disconnect the affected HO2S connector. Turn ignition on, with engine off. Observe the affected HO2S voltage parameter with a scan tool. Is the affected HO2S voltage within 425-475 mV? If yes, go to next step. If no, go to next step.
  5. Is the voltage more than 485 mV? If yes, go to next step. If no, go to step  7.
  6. Test the affected HO2S high signal circuit for a short to the affected HO2S heater low control circuit. Did you find and correct the condition? If yes, go to step  13. If no, go to step  10.
  7. Test the affected HO2S high signal circuit for a short to ground or a short to the HO2S low signal circuit. Did you find and correct the condition? If yes, go to step  13. If no, go to step  10.
  8. Inspect for the following that may affect the HO2S operation: HO2S for contamination, chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring, exhaust system leaks or restrictions, EVAP system malfunction, or incorrect fuel pressure. Did you find and correct the condition? If yes, go to step  13. If no, go to next step.
  9. Test for an intermittent and for a poor connection at the affected HO2S harness connector. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  10. Test for an intermittent and for a poor connection at the harness connector of the ECM. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  11. Replace affected HO2S. After replacing sensor(s), go to step  13.
  12. Replace ECM. Perform ECM relearn procedures. See ENGINE CONTROL MODULE  under PROGRAMMING. After replacing ECM, go to next step.
  13. Clear the DTCs with a scan tool. Turn ignition off. Start engine. Operate 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 step  2. If no, go to next step.
  14. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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