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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> Diagnostic Tests >> DTC P0133 & P0153: Ho2S Circuit - Slow Response - Bank 1 & 2, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
    2. NOTE: If any DTCs are set except P0133 or P0153, repair those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Idle engine at normal operating temperature. Operate vehicle within code enable criteria. Using scan tool, monitor DTC information. If DTC P0133 or P0153 failed this ignition cycle, go to next step. If DTC P0133 or P0153 did not fail this ignition cycle, see DIAGNOSTIC AIDS .
  3. If both DTC P0133 and P0153 failed this ignition cycle, go to step  8. If both DTC P0133 and P0153 did not fail this ignition cycle, go to next step.
  4. Check for an exhaust system leak. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to next step.
  5. Inspect the following items:
    • Ensure HO2S is securely installed.
    • Inspect for corrosion on terminals.
    • Test terminal tension at HO2S and at PCM.
    • Inspect for damaged wiring.

    If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to next step.

  6. Disconnect HO2S. Connect a jumper wire between HO2S connector terminal "A" (Tan wire or Tan/White wire) and ground. See Figure. Using scan tool, monitor HO2S voltage on ENGINE 1 data list. If scan tool indicates a voltage within 350-550 millivolts, go to next step. If scan tool does not indicate a voltage within 350-550 millivolts, go to step  10.
  7. Connect a jumper wire between HO2S connector terminal "A" (Tan wire or Tan/White wire) and ground, and between HO2S connector terminal "B" (Purple wire or Purple/White wire) and ground. Using scan tool, monitor HO2S voltage. If scan tool indicates a voltage less than 200 millivolts, go to step  13. If scan tool does not indicate a voltage less than 200 millivolts, go to step  9.
    8. NOTE: Determine and correct cause of contamination before replacing a sensor.
  8. Inspect for the following conditions:
    • Fuel contamination.
    • Use of improper RTV sealant.
    • Engine oil and coolant consumption.

    Replace affected HO2S. After repair, go to step  14.

  9. Remove jumper wire from HO2S low signal circuit. Using DVOM, measure voltage between HO2S connector terminal "A" (Tan wire or Tan/White wire) and ground. If voltage is about 5 volts, go to step  12. If voltage is not about 5 volts, go to step  11.
  10. Repair short to ground or short to voltage in Purple wire or Purple/White wire between HO2S and PCM. After repairs, go to step  14.
  11. Repair open or poor PCM connections in Tan wire or Tan/White wire between HO2S and PCM. After repairs, go to step  14.
  12. Repair open or poor PCM connections in Purple wire or Purple/White wire between HO2S and PCM. After repairs, go to step  14.
  13. Replace affected HO2S. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  15. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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