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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 P2232 or P2235 >> 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, verify that the HO2S parameter is between 350-500 mV.
    • If greater than 500 mV, test the signal circuit of the HO2S sensor for a short to the heater circuit. If the circuit/connections test normal, replace the ECM.
  5. If all circuits/connections test normal, replace the applicable HO2S.
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