LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0130: Ho2S 1 Circuit Closed Loop Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. 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. Start the engine. Allow the engine to idle at operating temperature. Clear the DTC and record the Freeze/Frame Failure Records. Observe the Heated Oxygen Sensor (HO2S) 1 voltage parameter using a scan tool. Does the HO2S 1 voltage fluctuate rapidly above and below 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 OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . 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, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  4. Turn ignition switch to OFF position. Disconnect the HO2S 1 connector. Turn ignition switch to RUN position, engine OFF. Measure the voltage from the HO2S 1 high signal circuit, on the engine harness side, to a good ground using a DMM. Is the HO2S 1 voltage within 425-500 mV? If yes, go to next step. If no, go to step  6.
  5. Turn ignition switch to OFF position. Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and the HO2S 1 low reference circuit on the engine harness side. Turn ignition switch to RUN position, engine OFF. Observe the HO2S 1 voltage parameter using a scan tool. Is the HO2S 1 voltage less than 25 mV? If yes, go to step  7. If no, go to next step.
  6. Turn ignition switch to OFF position. Disconnect both Powertrain Control Module (PCM) connectors. Measure the resistance of each of the following circuits using a DMM:
    • HO2S 1 high signal circuit between HO2S connector and the PCM connector.
    • HO2S 1 low reference circuit between HO2S connector and the PCM connector.
    • HO2S 1 low reference loop between pin C1-29 and pin C2-80 of the PCM connectors.

    Is the resistance of each circuit less than 5 ohms? If yes, go to step  10. If no, go to step  11.

  7. Remove the jumper wire from the previous step. Connect a test light between the HO2S 1 ignition voltage circuit and the HO2S 1 heater low control circuit terminals, on the engine harness side. Start the engine. Does the test light illuminate? If yes, go to next step. If no, go to stepDTC P0135: HO2S HEATER PERFORMANCE - SENSOR 1 .
  8. Inspect for the following that may affect the HO2S operation:
    • HO2S for contamination.
    • Chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring.
    • The HO2S must have a clean air reference to function properly. This clean air reference is obtained by way of the HO2S wires. Obstruction of the air reference and degraded HO2S performance could result from any attempt to repair the conditions.
    • Exhaust system leaks or restrictions. See EXHAUST SYSTEM in SYSTEM & COMPONENT TESTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
    • Evaporative Emissions (EVAP) system malfunction. Inspect the EVAP control system.
    • The fuel pressure. Incorrect fuel pressure can affect HO2S operation. Go to FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.

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

  9. Check for an intermittent and for a poor connection at the harness connector of the HO2S 1. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Check for an intermittent and for a poor connection at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the open or high resistance on the affected circuit. After repair, go to next step. If no, go to step  14.
  12. Replace the HO2S 1 sensor. After repair, go to next step. If no, go to step  14.
  13. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . 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.
  15. Using the scan tool, observe the stored information in CAPTURE INFO. Does scan tool display any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
scientia non olet · About LEMON Manuals