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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 424 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0030: HO2S HEATER CONTROL CIRCUIT SENSOR 1DIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada RWD

Diagnostic Procedures

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
  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 the DTCs with a scan tool. Turn ignition on, with engine off. Observe the DTC information with a scan tool for at least 30 seconds. Did DTC P0030 fail this ignition cycle? If yes go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn ignition off. Disconnect the HO2S bank 1 sensor 1 connector. Turn ignition on, with engine off. Measure the voltage between the HO2S bank 1 sensor 1 heater high control circuit, at the engine harness side, and a good ground. Is the voltage 9.75-10.5 volts? If yes, go to next step. If no, go to step  8.
  4. Turn ignition off. Turn ignition on, with engine off. Measure the voltage between the HO2S bank 1 sensor 1 heater low control circuit, at the engine harness side, and a good ground. Is battery voltage indicated? If yes, go to step  9. If no, go to next step.
  5. Test the HO2S bank 1 sensor 1 heater low control 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  14. If no, go to next step.
  6. Test the HO2S bank 2 sensor 1 heater low control 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  14. If no, go to next step.
  7. Test the HO2S bank 2 sensor 1 low control circuit for a short to ground or a short to the low signal circuit at the sensor side of the HO2S harness connector. Is the circuit shorted? If yes, go to step  11. If no, go to step  10.
  8. Test the HO2S bank 1 sensor 1 heater high control 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  14. If no, go to step. 10.
  9. Test for an intermittent and/or poor connections at the HO2S bank 1 sensor 1 harness connector. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Test for an intermittent and/or poor connections at the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Replace HO2S bank 2 sensor 1. See HEATED OXYGEN SENSOR under SENSORS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes go to step  14.
  12. Replace HO2S bank 1 sensor 1. See HEATED OXYGEN SENSOR under SENSORS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes go to step  14.
  13. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes, go to  14.
  14. Clear the DTCs with a scan tool. Turn off the ignition for 30 seconds. Start the engine and operate vehicle within the Conditions For Running DTC. You may also operate vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  15. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.