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Home >> Oldsmobile >> 1996 >> Achieva SC, 2.4 T, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.1L >> Diagnostic Trouble Codes >> DTC P1133 - Ho2S Insufficient Switching Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
    NOTE: If other DTCs are present, diagnose affected DTC(s) before proceeding.
  2. Start engine. Ensure engine is at normal operating temperature. Operate vehicle within the conditions required for setting this DTC. Monitor SPECIFIC DTC info for DTC P1133 until DTC P1133 test runs. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS.
  3. Check for exhaust leaks. Repair as necessary. After repair is completed, go to step 11). If exhaust is okay, go to next step.
  4. Inspect the following:
    • Check for proper HO2S 1 installation.
    • Check HO2S 1 connector and wiring for corrosion or damage.
    • Check HO2S 1 ground circuit.

    If a problem is found, go to step 8). If no problems were found, go to next step.

  5. Disconnect HO2S 1 connector. Connect a jumper wire between ground and ground circuit terminal at HO2S 1 harness connector. Turn ignition on. Using scan tool, monitor HO2S 1 voltage. If voltage is about 450 mV, go to next step. If voltage is not about 450 mV, go to step 9).
  6. Connect a jumper wire between ground and signal circuit terminal at HO2S 1 harness connector. If voltage is less than 300 mV, go to next step. If voltage is 300 mV or greater, go to step 10).
  7. Replace the affected oxygen sensor. After repairs, go to step 11).
  8. Repair as necessary. After repair is completed, go to step 11).
  9. Repair open in HO2S 1 ground circuit or short to ground in HO2S 1 signal circuit. After repair is completed, go to step 11).
  10. Repair open in HO2S 1 signal circuit or faulty PCM connections. After repair is completed, go to step 11).
  11. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P1133 until DTC P1133 test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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