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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 2007 (Engine Controls And Fuel - 3.6L (LCS) - DTC P2231 To DTC P2636) >> DTC P2231 or P2234 >> 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 of the appropriate HO2S.
  4. Ignition ON, test for 2.5-3.5 V between the reference voltage circuit terminal 6 and ground.
    • If greater than the specified range, test the reference voltage circuit for a short to the heater control circuit. If the circuit tests normal, replace the ECM.
  5. Test for 2-3 V between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for a short to the heater control circuit. If the circuit tests normal, replace the ECM.
  6. Test for 2-3 V between the input pump circuit terminal 1 and ground.
    • If greater than the specified range, test the input pump circuit and pump current circuit for a short to the heater control circuit. If the circuit tests normal, replace the ECM.
  7. If all circuits/connections test normal, replace the appropriate HO2S.
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