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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0333) >> DTC P0137, P0138, or P0140 >> 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 2.
  2. Ignition ON, test for 350-550 mV between the high signal circuit terminal B and ground.
    • If less than the specified range, test the high signal 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 high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Connect a 3A fused jumper wire between the high signal circuit terminal B and the low signal circuit terminal A. Verify the scan tool HO2S 2 parameter is less than 10 mV.
    • If greater than the specified range, test the low signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If all conditions test normal, replace the HO2S 2.
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