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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 350-550 mV between the high signal circuit terminal 1 and the low signal circuit terminal 5.
    • If less than the specified range, test the high signal circuit for an open, or a short to ground. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, replace the HO2S 1.
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