LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0130: Ho2S Circuit 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. Clear DTCs using a scan tool. Reset the fuel trim values. Start and idle the engine until normal operating temperature is reached. Use a scan tool in order to monitor the HO2S voltage for the sensor that applies to this DTC. Is the HO2S voltage fixed within 300-600 mV? If yes, go to step  4. If no, go to next step.
  3. The condition that set this DTC is not present. This DTC may have been set by one of the following conditions:
    • HO2S connector water intrusion.
    • An intermittently open HO2S high signal circuit.
    • An intermittently open HO2S low signal circuit.
    • An HO2S low signal circuit with high resistance to ground.
    • PCM ground circuits with high resistance to ground.
    • An in-operative HO2S heater.
    • Poor HO2S or PCM connector terminal contact.
    • An exhaust system leak, typically within 12" (30.4 cm) up-stream of the HO2S.
    • A defective HO2S.

    Repair any of the above conditions as necessary. Did you find and correct the condition? If yes, go to step  17. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.

  4. Turn OFF the ignition. Disconnect the HO2S connector for the sensor that applies to this DTC. Jumper the HO2S low signal circuit to a known-good ground. Jumper the HO2S high signal circuit to a known-good ground. Turn ON the ignition, with the engine OFF. With a scan tool, observe the HO2S voltage for the sensor that applies to this DTC. Does the voltage measure less than 20 mV? If yes, go to step  7. If no, go to next step.
  5. Turn OFF the ignition. Remove the jumpers from the HO2S terminals. Disconnect the PCM connector containing the HO2S high signal and low signal circuits. Use the DMM in order to measure the continuity of the HO2S high signal circuit and then the HO2S low signal circuits between the PCM connector terminal and the HO2S connector terminal, on the engine harness side. Does the resistance of both circuits measure less than 5 ohms? If yes, go to next step. If no, go to step  9.
  6. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  7. Remove the jumpers from the HO2S terminals. Connect a test lamp between the HO2S heater ignition 1 voltage circuit and heater ground circuit terminals, on the engine harness side. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? If yes, go to next step. If no, go to step  10.
  8. Turn OFF the ignition. Reconnect the HO2S connector. Disconnect the PCM connector containing the HO2S low signal circuits and the PCM connector containing the PCM ground circuits. Use the DMM in order to measure the resistance between the HO2S low signal terminal and one of the PCM ground circuit terminals. Does the resistance measure less than 500 ohms? If yes, go to step  12. If no, go to step  11.
  9. Repair the circuit that measured high resistance. After repairs, go to step  17.
  10. Repair the HO2S Heater ignition 1 voltage or heater ground circuit. Probable causes include the following conditions:
    • An open circuit.
    • A high circuit resistance.
    • A poor ground connection.
    • An open heater fuse, which can set other DTCs.

    After repairs, go to step  17.

  11. Repair the high resistance between the HO2S low signal circuit and the PCM ground circuit. Probable causes include the following conditions:
    • Poor HO2S connector terminal contact.
    • An open sensor harness low reference circuit, which will require an HO2S replacement.
    • A sensor harness low signal circuit with high resistance, which will require an HO2S replacement.
    • A poor PCM ground connection.
    • High PCM ground circuit resistance.
    • An ungrounded exhaust system.

    After repairs, go to step  17.

  12. Inspect for exhaust system leaks upstream of the suspect HO2S. The leak may be very small and will typically be within 12" (30.5 mm) of the suspect HO2S. Repair exhaust as necessary. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  13. Allow engine to cool to ambient temperature. Use the DMM in order to re-measure the resistance between the HO2S low signal circuit terminal and a PCM ground circuit terminal. Does the resistance measure less than 500 ohms? If yes, go to step  15. If no, go to next step.
  14. Remove the HO2S from the exhaust. Clean the HO2S mounting threads. Apply Anti-Seize Compound (P/N 5613695) or equivalent to the sensor threads. Tighten the HO2S to the proper torque. Use the DMM in order to re-measure the resistance between the HO2S low signal circuit terminal and a PCM ground circuit terminal. Does the resistance measure less than 500 ohms? If yes, go to step  17. If no, go to next step.
  15. Replace the HO2S sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  17.
  16. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  17. Clear the DTCs with a scan tool. 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.
  18. Observe the stored information, Capture Info with a scan tool. Does the 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