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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (Engine Control System & Fuel System - 3.6L - DTC P2105 To DTC P2626) >> DTC P2231 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the HO2S 1.
  2. Ignition ON, test for 2.5-3.5 volts between the high signal circuit terminal 1 and ground.
    • If greater than the specified range, test the high signal circuit for a short to the heater control circuit. If the circuit tests normal, replace the ECM.
  3. Test for 2-3 volts between the low signal circuit terminal 5 and ground
    • If greater than the specified range, test the low signal circuit for a short to the heater control circuit. If the circuit tests normal, replace the ECM.
    4. IMPORTANT: The input pumping current circuit and the pump current circuit are connected internally within the ECM. If there is a condition with one of the circuits, the other circuit will be affected.
  4. Test for less than 1 volt between the input pump circuit terminal 6 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.
  5. If all circuits test normal, replace the HO2S 1.
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