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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1987 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0008 To DTC P0193) >> DTC P0131 or P0151 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
  3. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
  4. Ignition ON, test for 2.5-3.5 V between the reference voltage circuit terminal 6 and ground.
    • If less than the specified range, test the reference voltage circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the reference voltage circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Test for 2-3 V between the low reference circuit terminal 2 and ground
    • If less than the specified range, test the low reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Test for 2-3 V between the pump current circuit terminal 5 and ground
    • If less than the specified range, test the pump current circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the pump current circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Test for 2-3 V between the input pump current circuit terminal 1 and ground.
    • If less than the specified range, test the input pump circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the input pump circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  8. Verify that the following conditions do not exist:
    • If you find any of the above conditions, repair as necessary.
  9. If all circuits test normal, replace the HO2S.
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